Modified: websites/production/turbine/content/fulcrum/fulcrum-cache/apidocs/src-html/org/apache/fulcrum/cache/impl/DefaultGlobalCacheService.html ============================================================================== --- websites/production/turbine/content/fulcrum/fulcrum-cache/apidocs/src-html/org/apache/fulcrum/cache/impl/DefaultGlobalCacheService.html (original) +++ websites/production/turbine/content/fulcrum/fulcrum-cache/apidocs/src-html/org/apache/fulcrum/cache/impl/DefaultGlobalCacheService.html Wed Aug 4 05:57:38 2021 @@ -1,490 +1,482 @@ -<HTML> -<BODY BGCOLOR="white"> -<PRE> -<FONT color="green">001</FONT> package org.apache.fulcrum.cache.impl;<a name="line.1"></a> -<FONT color="green">002</FONT> <a name="line.2"></a> -<FONT color="green">003</FONT> /*<a name="line.3"></a> -<FONT color="green">004</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.4"></a> -<FONT color="green">005</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.5"></a> -<FONT color="green">006</FONT> * distributed with this work for additional information<a name="line.6"></a> -<FONT color="green">007</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.7"></a> -<FONT color="green">008</FONT> * to you under the Apache License, Version 2.0 (the<a name="line.8"></a> -<FONT color="green">009</FONT> * "License"); you may not use this file except in compliance<a name="line.9"></a> -<FONT color="green">010</FONT> * with the License. You may obtain a copy of the License at<a name="line.10"></a> -<FONT color="green">011</FONT> *<a name="line.11"></a> -<FONT color="green">012</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.12"></a> -<FONT color="green">013</FONT> *<a name="line.13"></a> -<FONT color="green">014</FONT> * Unless required by applicable law or agreed to in writing,<a name="line.14"></a> -<FONT color="green">015</FONT> * software distributed under the License is distributed on an<a name="line.15"></a> -<FONT color="green">016</FONT> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.16"></a> -<FONT color="green">017</FONT> * KIND, either express or implied. See the License for the<a name="line.17"></a> -<FONT color="green">018</FONT> * specific language governing permissions and limitations<a name="line.18"></a> -<FONT color="green">019</FONT> * under the License.<a name="line.19"></a> -<FONT color="green">020</FONT> */<a name="line.20"></a> -<FONT color="green">021</FONT> <a name="line.21"></a> -<FONT color="green">022</FONT> import java.io.ByteArrayOutputStream;<a name="line.22"></a> -<FONT color="green">023</FONT> import java.io.IOException;<a name="line.23"></a> -<FONT color="green">024</FONT> import java.io.ObjectOutputStream;<a name="line.24"></a> -<FONT color="green">025</FONT> import java.util.ArrayList;<a name="line.25"></a> -<FONT color="green">026</FONT> import java.util.Enumeration;<a name="line.26"></a> -<FONT color="green">027</FONT> import java.util.Hashtable;<a name="line.27"></a> -<FONT color="green">028</FONT> import java.util.Iterator;<a name="line.28"></a> -<FONT color="green">029</FONT> import java.util.List;<a name="line.29"></a> -<FONT color="green">030</FONT> <a name="line.30"></a> -<FONT color="green">031</FONT> import org.apache.avalon.framework.activity.Disposable;<a name="line.31"></a> -<FONT color="green">032</FONT> import org.apache.avalon.framework.activity.Initializable;<a name="line.32"></a> -<FONT color="green">033</FONT> import org.apache.avalon.framework.configuration.Configurable;<a name="line.33"></a> -<FONT color="green">034</FONT> import org.apache.avalon.framework.configuration.Configuration;<a name="line.34"></a> -<FONT color="green">035</FONT> import org.apache.avalon.framework.configuration.ConfigurationException;<a name="line.35"></a> -<FONT color="green">036</FONT> import org.apache.avalon.framework.logger.AbstractLogEnabled;<a name="line.36"></a> -<FONT color="green">037</FONT> import org.apache.avalon.framework.thread.ThreadSafe;<a name="line.37"></a> -<FONT color="green">038</FONT> import org.apache.fulcrum.cache.CachedObject;<a name="line.38"></a> -<FONT color="green">039</FONT> import org.apache.fulcrum.cache.GlobalCacheService;<a name="line.39"></a> -<FONT color="green">040</FONT> import org.apache.fulcrum.cache.ObjectExpiredException;<a name="line.40"></a> -<FONT color="green">041</FONT> import org.apache.fulcrum.cache.RefreshableCachedObject;<a name="line.41"></a> -<FONT color="green">042</FONT> <a name="line.42"></a> -<FONT color="green">043</FONT> /**<a name="line.43"></a> -<FONT color="green">044</FONT> * This Service functions as a Global Cache. A global cache is a good place to<a name="line.44"></a> -<FONT color="green">045</FONT> * store items that you may need to access often but don't necessarily need (or<a name="line.45"></a> -<FONT color="green">046</FONT> * want) to fetch from the database everytime. A good example would be a look up<a name="line.46"></a> -<FONT color="green">047</FONT> * table of States that you store in a database and use throughout your<a name="line.47"></a> -<FONT color="green">048</FONT> * application. Since information about States doesn't change very often, you<a name="line.48"></a> -<FONT color="green">049</FONT> * could store this information in the Global Cache and decrease the overhead of<a name="line.49"></a> -<FONT color="green">050</FONT> * hitting the database everytime you need State information.<a name="line.50"></a> -<FONT color="green">051</FONT> * <a name="line.51"></a> -<FONT color="green">052</FONT> * @author <a href="mailto:[email protected]">Dave Bryson</a><a name="line.52"></a> -<FONT color="green">053</FONT> * @author <a href="mailto:[email protected]">Jon S. Stevens</a><a name="line.53"></a> -<FONT color="green">054</FONT> * @author <a href="mailto:[email protected]">John Thorhauer</a><a name="line.54"></a> -<FONT color="green">055</FONT> * @author <a href="mailto:[email protected]">Henning P. Schmiedehausen</a><a name="line.55"></a> -<FONT color="green">056</FONT> * @author <a href="mailto:[email protected]">Eric Pugh</a><a name="line.56"></a> -<FONT color="green">057</FONT> * @author <a href="mailto:[email protected]">Peter Courcoux</a><a name="line.57"></a> -<FONT color="green">058</FONT> * @version $Id: DefaultGlobalCacheService.java 927153 2010-03-24 18:55:08Z tv $<a name="line.58"></a> -<FONT color="green">059</FONT> */<a name="line.59"></a> -<FONT color="green">060</FONT> public class DefaultGlobalCacheService extends AbstractLogEnabled implements<a name="line.60"></a> -<FONT color="green">061</FONT> GlobalCacheService, Runnable, Configurable, Initializable, Disposable,<a name="line.61"></a> -<FONT color="green">062</FONT> ThreadSafe<a name="line.62"></a> -<FONT color="green">063</FONT> {<a name="line.63"></a> -<FONT color="green">064</FONT> /**<a name="line.64"></a> -<FONT color="green">065</FONT> * Initial size of hash table Value must be > 0. Default = 20<a name="line.65"></a> -<FONT color="green">066</FONT> */<a name="line.66"></a> -<FONT color="green">067</FONT> public static final int DEFAULT_INITIAL_CACHE_SIZE = 20;<a name="line.67"></a> -<FONT color="green">068</FONT> <a name="line.68"></a> -<FONT color="green">069</FONT> /**<a name="line.69"></a> -<FONT color="green">070</FONT> * The property for the InitalCacheSize<a name="line.70"></a> -<FONT color="green">071</FONT> */<a name="line.71"></a> -<FONT color="green">072</FONT> public static final String INITIAL_CACHE_SIZE = "cacheInitialSize";<a name="line.72"></a> -<FONT color="green">073</FONT> <a name="line.73"></a> -<FONT color="green">074</FONT> /**<a name="line.74"></a> -<FONT color="green">075</FONT> * The property for the Cache check frequency<a name="line.75"></a> -<FONT color="green">076</FONT> */<a name="line.76"></a> -<FONT color="green">077</FONT> public static final String CACHE_CHECK_FREQUENCY = "cacheCheckFrequency";<a name="line.77"></a> -<FONT color="green">078</FONT> <a name="line.78"></a> -<FONT color="green">079</FONT> /**<a name="line.79"></a> -<FONT color="green">080</FONT> * Cache check frequency in Millis (1000 Millis = 1 second). Value must be ><a name="line.80"></a> -<FONT color="green">081</FONT> * 0. Default = 5 seconds<a name="line.81"></a> -<FONT color="green">082</FONT> */<a name="line.82"></a> -<FONT color="green">083</FONT> public static final long DEFAULT_CACHE_CHECK_FREQUENCY = 5000; // 5 seconds<a name="line.83"></a> -<FONT color="green">084</FONT> <a name="line.84"></a> -<FONT color="green">085</FONT> /** The cache. * */<a name="line.85"></a> -<FONT color="green">086</FONT> protected Hashtable cache = null;<a name="line.86"></a> -<FONT color="green">087</FONT> <a name="line.87"></a> -<FONT color="green">088</FONT> /**<a name="line.88"></a> -<FONT color="green">089</FONT> * cacheCheckFrequency (default - 5 seconds)<a name="line.89"></a> -<FONT color="green">090</FONT> */<a name="line.90"></a> -<FONT color="green">091</FONT> private long cacheCheckFrequency;<a name="line.91"></a> -<FONT color="green">092</FONT> <a name="line.92"></a> -<FONT color="green">093</FONT> /**<a name="line.93"></a> -<FONT color="green">094</FONT> * cacheInitialSize (default - 20)<a name="line.94"></a> -<FONT color="green">095</FONT> */<a name="line.95"></a> -<FONT color="green">096</FONT> private int cacheInitialSize;<a name="line.96"></a> -<FONT color="green">097</FONT> <a name="line.97"></a> -<FONT color="green">098</FONT> /** thread for removing stale items from the cache */<a name="line.98"></a> -<FONT color="green">099</FONT> private Thread housekeeping;<a name="line.99"></a> -<FONT color="green">100</FONT> <a name="line.100"></a> -<FONT color="green">101</FONT> /** flag to stop the housekeeping thread when the component is disposed. */<a name="line.101"></a> -<FONT color="green">102</FONT> private boolean continueThread;<a name="line.102"></a> -<FONT color="green">103</FONT> <a name="line.103"></a> -<FONT color="green">104</FONT> /**<a name="line.104"></a> -<FONT color="green">105</FONT> * Get the Cache Check Frequency in milliseconds<a name="line.105"></a> -<FONT color="green">106</FONT> * <a name="line.106"></a> -<FONT color="green">107</FONT> * @return the time between two cache check runs in milliseconds<a name="line.107"></a> -<FONT color="green">108</FONT> */<a name="line.108"></a> -<FONT color="green">109</FONT> public long getCacheCheckFrequency()<a name="line.109"></a> -<FONT color="green">110</FONT> {<a name="line.110"></a> -<FONT color="green">111</FONT> return this.cacheCheckFrequency;<a name="line.111"></a> -<FONT color="green">112</FONT> }<a name="line.112"></a> -<FONT color="green">113</FONT> <a name="line.113"></a> -<FONT color="green">114</FONT> /**<a name="line.114"></a> -<FONT color="green">115</FONT> * Returns an item from the cache. /** Returns an item from the cache.<a name="line.115"></a> -<FONT color="green">116</FONT> * RefreshableCachedObject will be refreshed if it is expired and not<a name="line.116"></a> -<FONT color="green">117</FONT> * untouched.<a name="line.117"></a> -<FONT color="green">118</FONT> * <a name="line.118"></a> -<FONT color="green">119</FONT> * @param id<a name="line.119"></a> -<FONT color="green">120</FONT> * The key of the stored object.<a name="line.120"></a> -<FONT color="green">121</FONT> * @return The object from the cache.<a name="line.121"></a> -<FONT color="green">122</FONT> * @exception ObjectExpiredException,<a name="line.122"></a> -<FONT color="green">123</FONT> * when either the object is not in the cache or it has<a name="line.123"></a> -<FONT color="green">124</FONT> * expired.<a name="line.124"></a> -<FONT color="green">125</FONT> */<a name="line.125"></a> -<FONT color="green">126</FONT> public CachedObject getObject(String id) throws ObjectExpiredException<a name="line.126"></a> -<FONT color="green">127</FONT> {<a name="line.127"></a> -<FONT color="green">128</FONT> CachedObject obj = null;<a name="line.128"></a> -<FONT color="green">129</FONT> obj = (CachedObject) this.cache.get(id);<a name="line.129"></a> -<FONT color="green">130</FONT> if (obj == null)<a name="line.130"></a> -<FONT color="green">131</FONT> {<a name="line.131"></a> -<FONT color="green">132</FONT> // Not in the cache.<a name="line.132"></a> -<FONT color="green">133</FONT> throw new ObjectExpiredException();<a name="line.133"></a> -<FONT color="green">134</FONT> }<a name="line.134"></a> -<FONT color="green">135</FONT> if (obj.isStale())<a name="line.135"></a> -<FONT color="green">136</FONT> {<a name="line.136"></a> -<FONT color="green">137</FONT> if (obj instanceof RefreshableCachedObject)<a name="line.137"></a> -<FONT color="green">138</FONT> {<a name="line.138"></a> -<FONT color="green">139</FONT> RefreshableCachedObject rco = (RefreshableCachedObject) obj;<a name="line.139"></a> -<FONT color="green">140</FONT> if (rco.isUntouched())<a name="line.140"></a> -<FONT color="green">141</FONT> {<a name="line.141"></a> -<FONT color="green">142</FONT> throw new ObjectExpiredException();<a name="line.142"></a> -<FONT color="green">143</FONT> }<a name="line.143"></a> -<FONT color="green">144</FONT> // Refresh Object<a name="line.144"></a> -<FONT color="green">145</FONT> rco.refresh();<a name="line.145"></a> -<FONT color="green">146</FONT> if (rco.isStale())<a name="line.146"></a> -<FONT color="green">147</FONT> {<a name="line.147"></a> -<FONT color="green">148</FONT> throw new ObjectExpiredException();<a name="line.148"></a> -<FONT color="green">149</FONT> }<a name="line.149"></a> -<FONT color="green">150</FONT> }<a name="line.150"></a> -<FONT color="green">151</FONT> else<a name="line.151"></a> -<FONT color="green">152</FONT> {<a name="line.152"></a> -<FONT color="green">153</FONT> // Expired.<a name="line.153"></a> -<FONT color="green">154</FONT> throw new ObjectExpiredException();<a name="line.154"></a> -<FONT color="green">155</FONT> }<a name="line.155"></a> -<FONT color="green">156</FONT> }<a name="line.156"></a> -<FONT color="green">157</FONT> if (obj instanceof RefreshableCachedObject)<a name="line.157"></a> -<FONT color="green">158</FONT> {<a name="line.158"></a> -<FONT color="green">159</FONT> // notify it that it's being accessed.<a name="line.159"></a> -<FONT color="green">160</FONT> RefreshableCachedObject rco = (RefreshableCachedObject) obj;<a name="line.160"></a> -<FONT color="green">161</FONT> rco.touch();<a name="line.161"></a> -<FONT color="green">162</FONT> }<a name="line.162"></a> -<FONT color="green">163</FONT> return obj;<a name="line.163"></a> -<FONT color="green">164</FONT> }<a name="line.164"></a> -<FONT color="green">165</FONT> <a name="line.165"></a> -<FONT color="green">166</FONT> /**<a name="line.166"></a> -<FONT color="green">167</FONT> * Adds an object to the cache.<a name="line.167"></a> -<FONT color="green">168</FONT> * <a name="line.168"></a> -<FONT color="green">169</FONT> * @param id<a name="line.169"></a> -<FONT color="green">170</FONT> * The key to store the object by.<a name="line.170"></a> -<FONT color="green">171</FONT> * @param o<a name="line.171"></a> -<FONT color="green">172</FONT> * The object to cache.<a name="line.172"></a> -<FONT color="green">173</FONT> */<a name="line.173"></a> -<FONT color="green">174</FONT> public void addObject(String id, CachedObject o)<a name="line.174"></a> -<FONT color="green">175</FONT> {<a name="line.175"></a> -<FONT color="green">176</FONT> // If the cache already contains the key, remove it and add<a name="line.176"></a> -<FONT color="green">177</FONT> // the fresh one.<a name="line.177"></a> -<FONT color="green">178</FONT> if (this.cache.containsKey(id))<a name="line.178"></a> -<FONT color="green">179</FONT> {<a name="line.179"></a> -<FONT color="green">180</FONT> this.cache.remove(id);<a name="line.180"></a> -<FONT color="green">181</FONT> }<a name="line.181"></a> -<FONT color="green">182</FONT> this.cache.put(id, o);<a name="line.182"></a> -<FONT color="green">183</FONT> }<a name="line.183"></a> -<FONT color="green">184</FONT> <a name="line.184"></a> -<FONT color="green">185</FONT> /**<a name="line.185"></a> -<FONT color="green">186</FONT> * Removes an object from the cache.<a name="line.186"></a> -<FONT color="green">187</FONT> * <a name="line.187"></a> -<FONT color="green">188</FONT> * @param id<a name="line.188"></a> -<FONT color="green">189</FONT> * The String id for the object.<a name="line.189"></a> -<FONT color="green">190</FONT> */<a name="line.190"></a> -<FONT color="green">191</FONT> public void removeObject(String id)<a name="line.191"></a> -<FONT color="green">192</FONT> {<a name="line.192"></a> -<FONT color="green">193</FONT> this.cache.remove(id);<a name="line.193"></a> -<FONT color="green">194</FONT> }<a name="line.194"></a> -<FONT color="green">195</FONT> <a name="line.195"></a> -<FONT color="green">196</FONT> /**<a name="line.196"></a> -<FONT color="green">197</FONT> * Returns a copy of keys to objects in the cache as a list.<a name="line.197"></a> -<FONT color="green">198</FONT> * <a name="line.198"></a> -<FONT color="green">199</FONT> * Note that keys to expired objects are not returned.<a name="line.199"></a> -<FONT color="green">200</FONT> * <a name="line.200"></a> -<FONT color="green">201</FONT> * @return A List of <code>String</code>'s representing the keys to<a name="line.201"></a> -<FONT color="green">202</FONT> * objects in the cache.<a name="line.202"></a> -<FONT color="green">203</FONT> */<a name="line.203"></a> -<FONT color="green">204</FONT> public List getKeys()<a name="line.204"></a> -<FONT color="green">205</FONT> {<a name="line.205"></a> -<FONT color="green">206</FONT> ArrayList keys = new ArrayList(this.cache.size());<a name="line.206"></a> -<FONT color="green">207</FONT> synchronized (this)<a name="line.207"></a> -<FONT color="green">208</FONT> {<a name="line.208"></a> -<FONT color="green">209</FONT> for (Iterator itr = this.cache.keySet().iterator(); itr.hasNext();)<a name="line.209"></a> -<FONT color="green">210</FONT> {<a name="line.210"></a> -<FONT color="green">211</FONT> String key = (String) itr.next();<a name="line.211"></a> -<FONT color="green">212</FONT> try<a name="line.212"></a> -<FONT color="green">213</FONT> {<a name="line.213"></a> -<FONT color="green">214</FONT> /* CachedObject obj = */getObject(key);<a name="line.214"></a> -<FONT color="green">215</FONT> }<a name="line.215"></a> -<FONT color="green">216</FONT> catch (ObjectExpiredException oee)<a name="line.216"></a> -<FONT color="green">217</FONT> {<a name="line.217"></a> -<FONT color="green">218</FONT> // this is OK we just do not want this key<a name="line.218"></a> -<FONT color="green">219</FONT> continue;<a name="line.219"></a> -<FONT color="green">220</FONT> }<a name="line.220"></a> -<FONT color="green">221</FONT> keys.add(new String(key));<a name="line.221"></a> -<FONT color="green">222</FONT> }<a name="line.222"></a> -<FONT color="green">223</FONT> }<a name="line.223"></a> -<FONT color="green">224</FONT> return keys;<a name="line.224"></a> -<FONT color="green">225</FONT> }<a name="line.225"></a> -<FONT color="green">226</FONT> <a name="line.226"></a> -<FONT color="green">227</FONT> /**<a name="line.227"></a> -<FONT color="green">228</FONT> * Returns a copy of the non-expired CachedObjects in the cache as a list.<a name="line.228"></a> -<FONT color="green">229</FONT> * <a name="line.229"></a> -<FONT color="green">230</FONT> * @return A List of <code>CachedObject</code> objects held in the cache<a name="line.230"></a> -<FONT color="green">231</FONT> */<a name="line.231"></a> -<FONT color="green">232</FONT> public List getCachedObjects()<a name="line.232"></a> -<FONT color="green">233</FONT> {<a name="line.233"></a> -<FONT color="green">234</FONT> ArrayList objects = new ArrayList(this.cache.size());<a name="line.234"></a> -<FONT color="green">235</FONT> synchronized (this)<a name="line.235"></a> -<FONT color="green">236</FONT> {<a name="line.236"></a> -<FONT color="green">237</FONT> for (Iterator itr = this.cache.keySet().iterator(); itr.hasNext();)<a name="line.237"></a> -<FONT color="green">238</FONT> {<a name="line.238"></a> -<FONT color="green">239</FONT> String key = (String) itr.next();<a name="line.239"></a> -<FONT color="green">240</FONT> CachedObject obj = null;<a name="line.240"></a> -<FONT color="green">241</FONT> try<a name="line.241"></a> -<FONT color="green">242</FONT> {<a name="line.242"></a> -<FONT color="green">243</FONT> obj = getObject(key);<a name="line.243"></a> -<FONT color="green">244</FONT> }<a name="line.244"></a> -<FONT color="green">245</FONT> catch (ObjectExpiredException oee)<a name="line.245"></a> -<FONT color="green">246</FONT> {<a name="line.246"></a> -<FONT color="green">247</FONT> // this is OK we just do not want this object<a name="line.247"></a> -<FONT color="green">248</FONT> continue;<a name="line.248"></a> -<FONT color="green">249</FONT> }<a name="line.249"></a> -<FONT color="green">250</FONT> objects.add(obj);<a name="line.250"></a> -<FONT color="green">251</FONT> }<a name="line.251"></a> -<FONT color="green">252</FONT> }<a name="line.252"></a> -<FONT color="green">253</FONT> return objects;<a name="line.253"></a> -<FONT color="green">254</FONT> }<a name="line.254"></a> -<FONT color="green">255</FONT> <a name="line.255"></a> -<FONT color="green">256</FONT> /**<a name="line.256"></a> -<FONT color="green">257</FONT> * Circle through the cache and remove stale objects. Frequency is<a name="line.257"></a> -<FONT color="green">258</FONT> * determined by the cacheCheckFrequency property.<a name="line.258"></a> -<FONT color="green">259</FONT> */<a name="line.259"></a> -<FONT color="green">260</FONT> public void run()<a name="line.260"></a> -<FONT color="green">261</FONT> {<a name="line.261"></a> -<FONT color="green">262</FONT> while (this.continueThread)<a name="line.262"></a> -<FONT color="green">263</FONT> {<a name="line.263"></a> -<FONT color="green">264</FONT> // Sleep for amount of time set in cacheCheckFrequency -<a name="line.264"></a> -<FONT color="green">265</FONT> // default = 5 seconds.<a name="line.265"></a> -<FONT color="green">266</FONT> try<a name="line.266"></a> -<FONT color="green">267</FONT> {<a name="line.267"></a> -<FONT color="green">268</FONT> Thread.sleep(this.cacheCheckFrequency);<a name="line.268"></a> -<FONT color="green">269</FONT> }<a name="line.269"></a> -<FONT color="green">270</FONT> catch (InterruptedException exc)<a name="line.270"></a> -<FONT color="green">271</FONT> {<a name="line.271"></a> -<FONT color="green">272</FONT> if (!this.continueThread)<a name="line.272"></a> -<FONT color="green">273</FONT> {<a name="line.273"></a> -<FONT color="green">274</FONT> return;<a name="line.274"></a> -<FONT color="green">275</FONT> }<a name="line.275"></a> -<FONT color="green">276</FONT> }<a name="line.276"></a> -<FONT color="green">277</FONT> <a name="line.277"></a> -<FONT color="green">278</FONT> clearCache();<a name="line.278"></a> -<FONT color="green">279</FONT> }<a name="line.279"></a> -<FONT color="green">280</FONT> }<a name="line.280"></a> -<FONT color="green">281</FONT> <a name="line.281"></a> -<FONT color="green">282</FONT> /**<a name="line.282"></a> -<FONT color="green">283</FONT> * Iterate through the cache and remove or refresh stale objects.<a name="line.283"></a> -<FONT color="green">284</FONT> */<a name="line.284"></a> -<FONT color="green">285</FONT> public void clearCache()<a name="line.285"></a> -<FONT color="green">286</FONT> {<a name="line.286"></a> -<FONT color="green">287</FONT> List refreshThese = new ArrayList(20);<a name="line.287"></a> -<FONT color="green">288</FONT> // Sync on this object so that other threads do not<a name="line.288"></a> -<FONT color="green">289</FONT> // change the Hashtable while enumerating over it.<a name="line.289"></a> -<FONT color="green">290</FONT> synchronized (this)<a name="line.290"></a> -<FONT color="green">291</FONT> {<a name="line.291"></a> -<FONT color="green">292</FONT> for (Enumeration e = this.cache.keys(); e.hasMoreElements();)<a name="line.292"></a> -<FONT color="green">293</FONT> {<a name="line.293"></a> -<FONT color="green">294</FONT> String key = (String) e.nextElement();<a name="line.294"></a> -<FONT color="green">295</FONT> CachedObject co = (CachedObject) this.cache.get(key);<a name="line.295"></a> -<FONT color="green">296</FONT> if (co instanceof RefreshableCachedObject)<a name="line.296"></a> -<FONT color="green">297</FONT> {<a name="line.297"></a> -<FONT color="green">298</FONT> RefreshableCachedObject rco = (RefreshableCachedObject) co;<a name="line.298"></a> -<FONT color="green">299</FONT> if (rco.isUntouched())<a name="line.299"></a> -<FONT color="green">300</FONT> {<a name="line.300"></a> -<FONT color="green">301</FONT> this.cache.remove(key);<a name="line.301"></a> -<FONT color="green">302</FONT> }<a name="line.302"></a> -<FONT color="green">303</FONT> else if (rco.isStale())<a name="line.303"></a> -<FONT color="green">304</FONT> {<a name="line.304"></a> -<FONT color="green">305</FONT> // to prolong holding the lock on this object<a name="line.305"></a> -<FONT color="green">306</FONT> refreshThese.add(key);<a name="line.306"></a> -<FONT color="green">307</FONT> }<a name="line.307"></a> -<FONT color="green">308</FONT> }<a name="line.308"></a> -<FONT color="green">309</FONT> else if (co.isStale())<a name="line.309"></a> -<FONT color="green">310</FONT> {<a name="line.310"></a> -<FONT color="green">311</FONT> this.cache.remove(key);<a name="line.311"></a> -<FONT color="green">312</FONT> }<a name="line.312"></a> -<FONT color="green">313</FONT> }<a name="line.313"></a> -<FONT color="green">314</FONT> }<a name="line.314"></a> -<FONT color="green">315</FONT> for (Iterator i = refreshThese.iterator(); i.hasNext();)<a name="line.315"></a> -<FONT color="green">316</FONT> {<a name="line.316"></a> -<FONT color="green">317</FONT> String key = (String) i.next();<a name="line.317"></a> -<FONT color="green">318</FONT> CachedObject co = (CachedObject) this.cache.get(key);<a name="line.318"></a> -<FONT color="green">319</FONT> RefreshableCachedObject rco = (RefreshableCachedObject) co;<a name="line.319"></a> -<FONT color="green">320</FONT> rco.refresh();<a name="line.320"></a> -<FONT color="green">321</FONT> }<a name="line.321"></a> -<FONT color="green">322</FONT> }<a name="line.322"></a> -<FONT color="green">323</FONT> <a name="line.323"></a> -<FONT color="green">324</FONT> /**<a name="line.324"></a> -<FONT color="green">325</FONT> * Returns the number of objects currently stored in the cache<a name="line.325"></a> -<FONT color="green">326</FONT> * <a name="line.326"></a> -<FONT color="green">327</FONT> * @return int number of object in the cache<a name="line.327"></a> -<FONT color="green">328</FONT> */<a name="line.328"></a> -<FONT color="green">329</FONT> public int getNumberOfObjects()<a name="line.329"></a> -<FONT color="green">330</FONT> {<a name="line.330"></a> -<FONT color="green">331</FONT> return this.cache.size();<a name="line.331"></a> -<FONT color="green">332</FONT> }<a name="line.332"></a> -<FONT color="green">333</FONT> <a name="line.333"></a> -<FONT color="green">334</FONT> /**<a name="line.334"></a> -<FONT color="green">335</FONT> * Returns the current size of the cache.<a name="line.335"></a> -<FONT color="green">336</FONT> * <a name="line.336"></a> -<FONT color="green">337</FONT> * @return int representing current cache size in number of bytes<a name="line.337"></a> -<FONT color="green">338</FONT> */<a name="line.338"></a> -<FONT color="green">339</FONT> public int getCacheSize() throws IOException<a name="line.339"></a> -<FONT color="green">340</FONT> {<a name="line.340"></a> -<FONT color="green">341</FONT> ByteArrayOutputStream baos = new ByteArrayOutputStream();<a name="line.341"></a> -<FONT color="green">342</FONT> ObjectOutputStream out = new ObjectOutputStream(baos);<a name="line.342"></a> -<FONT color="green">343</FONT> out.writeObject(this.cache);<a name="line.343"></a> -<FONT color="green">344</FONT> out.flush();<a name="line.344"></a> -<FONT color="green">345</FONT> //<a name="line.345"></a> -<FONT color="green">346</FONT> // Subtract 4 bytes from the length, because the serialization<a name="line.346"></a> -<FONT color="green">347</FONT> // magic number (2 bytes) and version number (2 bytes) are<a name="line.347"></a> -<FONT color="green">348</FONT> // both written to the stream before the object<a name="line.348"></a> -<FONT color="green">349</FONT> //<a name="line.349"></a> -<FONT color="green">350</FONT> int objectsize = baos.toByteArray().length - 4;<a name="line.350"></a> -<FONT color="green">351</FONT> return objectsize;<a name="line.351"></a> -<FONT color="green">352</FONT> }<a name="line.352"></a> -<FONT color="green">353</FONT> <a name="line.353"></a> -<FONT color="green">354</FONT> /**<a name="line.354"></a> -<FONT color="green">355</FONT> * Flush the cache of all objects.<a name="line.355"></a> -<FONT color="green">356</FONT> */<a name="line.356"></a> -<FONT color="green">357</FONT> public void flushCache()<a name="line.357"></a> -<FONT color="green">358</FONT> {<a name="line.358"></a> -<FONT color="green">359</FONT> synchronized (this)<a name="line.359"></a> -<FONT color="green">360</FONT> {<a name="line.360"></a> -<FONT color="green">361</FONT> for (Enumeration e = this.cache.keys(); e.hasMoreElements();)<a name="line.361"></a> -<FONT color="green">362</FONT> {<a name="line.362"></a> -<FONT color="green">363</FONT> String key = (String) e.nextElement();<a name="line.363"></a> -<FONT color="green">364</FONT> this.cache.remove(key);<a name="line.364"></a> -<FONT color="green">365</FONT> }<a name="line.365"></a> -<FONT color="green">366</FONT> }<a name="line.366"></a> -<FONT color="green">367</FONT> }<a name="line.367"></a> -<FONT color="green">368</FONT> <a name="line.368"></a> -<FONT color="green">369</FONT> // ---------------- Avalon Lifecycle Methods ---------------------<a name="line.369"></a> -<FONT color="green">370</FONT> /**<a name="line.370"></a> -<FONT color="green">371</FONT> * Avalon component lifecycle method<a name="line.371"></a> -<FONT color="green">372</FONT> */<a name="line.372"></a> -<FONT color="green">373</FONT> public void configure(Configuration conf) throws ConfigurationException<a name="line.373"></a> -<FONT color="green">374</FONT> {<a name="line.374"></a> -<FONT color="green">375</FONT> this.cacheCheckFrequency = conf.getAttributeAsLong(<a name="line.375"></a> -<FONT color="green">376</FONT> CACHE_CHECK_FREQUENCY, DEFAULT_CACHE_CHECK_FREQUENCY);<a name="line.376"></a> -<FONT color="green">377</FONT> this.cacheInitialSize = conf.getAttributeAsInteger(INITIAL_CACHE_SIZE,<a name="line.377"></a> -<FONT color="green">378</FONT> DEFAULT_INITIAL_CACHE_SIZE);<a name="line.378"></a> -<FONT color="green">379</FONT> }<a name="line.379"></a> -<FONT color="green">380</FONT> <a name="line.380"></a> -<FONT color="green">381</FONT> /**<a name="line.381"></a> -<FONT color="green">382</FONT> * Avalon component lifecycle method<a name="line.382"></a> -<FONT color="green">383</FONT> */<a name="line.383"></a> -<FONT color="green">384</FONT> public void initialize() throws Exception<a name="line.384"></a> -<FONT color="green">385</FONT> {<a name="line.385"></a> -<FONT color="green">386</FONT> try<a name="line.386"></a> -<FONT color="green">387</FONT> {<a name="line.387"></a> -<FONT color="green">388</FONT> this.cache = new Hashtable(this.cacheInitialSize);<a name="line.388"></a> -<FONT color="green">389</FONT> // Start housekeeping thread.<a name="line.389"></a> -<FONT color="green">390</FONT> this.continueThread = true;<a name="line.390"></a> -<FONT color="green">391</FONT> this.housekeeping = new Thread(this);<a name="line.391"></a> -<FONT color="green">392</FONT> // Indicate that this is a system thread. JVM will quit only when<a name="line.392"></a> -<FONT color="green">393</FONT> // there are no more active user threads. Settings threads spawned<a name="line.393"></a> -<FONT color="green">394</FONT> // internally by Turbine as daemons allows commandline applications<a name="line.394"></a> -<FONT color="green">395</FONT> // using Turbine to terminate in an orderly manner.<a name="line.395"></a> -<FONT color="green">396</FONT> this.housekeeping.setDaemon(true);<a name="line.396"></a> -<FONT color="green">397</FONT> this.housekeeping.start();<a name="line.397"></a> -<FONT color="green">398</FONT> }<a name="line.398"></a> -<FONT color="green">399</FONT> catch (Exception e)<a name="line.399"></a> -<FONT color="green">400</FONT> {<a name="line.400"></a> -<FONT color="green">401</FONT> throw new Exception(<a name="line.401"></a> -<FONT color="green">402</FONT> "DefaultGlobalCacheService failed to initialize", e);<a name="line.402"></a> -<FONT color="green">403</FONT> }<a name="line.403"></a> -<FONT color="green">404</FONT> }<a name="line.404"></a> -<FONT color="green">405</FONT> <a name="line.405"></a> -<FONT color="green">406</FONT> /**<a name="line.406"></a> -<FONT color="green">407</FONT> * Avalon component lifecycle method<a name="line.407"></a> -<FONT color="green">408</FONT> */<a name="line.408"></a> -<FONT color="green">409</FONT> public void dispose()<a name="line.409"></a> -<FONT color="green">410</FONT> {<a name="line.410"></a> -<FONT color="green">411</FONT> this.continueThread = false;<a name="line.411"></a> -<FONT color="green">412</FONT> this.housekeeping.interrupt();<a name="line.412"></a> -<FONT color="green">413</FONT> }<a name="line.413"></a> -<FONT color="green">414</FONT> <a name="line.414"></a> -<FONT color="green">415</FONT> /**<a name="line.415"></a> -<FONT color="green">416</FONT> * The name used to specify this component in TurbineResources.properties<a name="line.416"></a> -<FONT color="green">417</FONT> * <a name="line.417"></a> -<FONT color="green">418</FONT> * @deprecated part of the pre-avalon compatibility layer<a name="line.418"></a> -<FONT color="green">419</FONT> */<a name="line.419"></a> -<FONT color="green">420</FONT> protected String getName()<a name="line.420"></a> -<FONT color="green">421</FONT> {<a name="line.421"></a> -<FONT color="green">422</FONT> return "GlobalCacheService";<a name="line.422"></a> -<FONT color="green">423</FONT> }<a name="line.423"></a> -<FONT color="green">424</FONT> }<a name="line.424"></a> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -</PRE> -</BODY> -</HTML> +<!DOCTYPE HTML> +<html lang="de"> +<head> +<title>Source code</title> +<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> +</head> +<body> +<main role="main"> +<div class="sourceContainer"> +<pre><span class="sourceLineNo">001</span><a id="line.1">package org.apache.fulcrum.cache.impl;</a> +<span class="sourceLineNo">002</span><a id="line.2"></a> +<span class="sourceLineNo">003</span><a id="line.3">/*</a> +<span class="sourceLineNo">004</span><a id="line.4"> * Licensed to the Apache Software Foundation (ASF) under one</a> +<span class="sourceLineNo">005</span><a id="line.5"> * or more contributor license agreements. See the NOTICE file</a> +<span class="sourceLineNo">006</span><a id="line.6"> * distributed with this work for additional information</a> +<span class="sourceLineNo">007</span><a id="line.7"> * regarding copyright ownership. The ASF licenses this file</a> +<span class="sourceLineNo">008</span><a id="line.8"> * to you under the Apache License, Version 2.0 (the</a> +<span class="sourceLineNo">009</span><a id="line.9"> * "License"); you may not use this file except in compliance</a> +<span class="sourceLineNo">010</span><a id="line.10"> * with the License. You may obtain a copy of the License at</a> +<span class="sourceLineNo">011</span><a id="line.11"> *</a> +<span class="sourceLineNo">012</span><a id="line.12"> * http://www.apache.org/licenses/LICENSE-2.0</a> +<span class="sourceLineNo">013</span><a id="line.13"> *</a> +<span class="sourceLineNo">014</span><a id="line.14"> * Unless required by applicable law or agreed to in writing,</a> +<span class="sourceLineNo">015</span><a id="line.15"> * software distributed under the License is distributed on an</a> +<span class="sourceLineNo">016</span><a id="line.16"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</a> +<span class="sourceLineNo">017</span><a id="line.17"> * KIND, either express or implied. See the License for the</a> +<span class="sourceLineNo">018</span><a id="line.18"> * specific language governing permissions and limitations</a> +<span class="sourceLineNo">019</span><a id="line.19"> * under the License.</a> +<span class="sourceLineNo">020</span><a id="line.20"> */</a> +<span class="sourceLineNo">021</span><a id="line.21"></a> +<span class="sourceLineNo">022</span><a id="line.22">import java.io.ByteArrayOutputStream;</a> +<span class="sourceLineNo">023</span><a id="line.23">import java.io.IOException;</a> +<span class="sourceLineNo">024</span><a id="line.24">import java.io.ObjectOutputStream;</a> +<span class="sourceLineNo">025</span><a id="line.25">import java.util.ArrayList;</a> +<span class="sourceLineNo">026</span><a id="line.26">import java.util.List;</a> +<span class="sourceLineNo">027</span><a id="line.27">import java.util.concurrent.ConcurrentHashMap;</a> +<span class="sourceLineNo">028</span><a id="line.28"></a> +<span class="sourceLineNo">029</span><a id="line.29">import org.apache.avalon.framework.activity.Disposable;</a> +<span class="sourceLineNo">030</span><a id="line.30">import org.apache.avalon.framework.activity.Initializable;</a> +<span class="sourceLineNo">031</span><a id="line.31">import org.apache.avalon.framework.configuration.Configurable;</a> +<span class="sourceLineNo">032</span><a id="line.32">import org.apache.avalon.framework.configuration.Configuration;</a> +<span class="sourceLineNo">033</span><a id="line.33">import org.apache.avalon.framework.configuration.ConfigurationException;</a> +<span class="sourceLineNo">034</span><a id="line.34">import org.apache.avalon.framework.logger.AbstractLogEnabled;</a> +<span class="sourceLineNo">035</span><a id="line.35">import org.apache.avalon.framework.thread.ThreadSafe;</a> +<span class="sourceLineNo">036</span><a id="line.36">import org.apache.fulcrum.cache.CachedObject;</a> +<span class="sourceLineNo">037</span><a id="line.37">import org.apache.fulcrum.cache.GlobalCacheService;</a> +<span class="sourceLineNo">038</span><a id="line.38">import org.apache.fulcrum.cache.ObjectExpiredException;</a> +<span class="sourceLineNo">039</span><a id="line.39">import org.apache.fulcrum.cache.RefreshableCachedObject;</a> +<span class="sourceLineNo">040</span><a id="line.40"></a> +<span class="sourceLineNo">041</span><a id="line.41">/**</a> +<span class="sourceLineNo">042</span><a id="line.42"> * This Service functions as a Global Cache. A global cache is a good place to</a> +<span class="sourceLineNo">043</span><a id="line.43"> * store items that you may need to access often but don't necessarily need (or</a> +<span class="sourceLineNo">044</span><a id="line.44"> * want) to fetch from the database everytime. A good example would be a look up</a> +<span class="sourceLineNo">045</span><a id="line.45"> * table of States that you store in a database and use throughout your</a> +<span class="sourceLineNo">046</span><a id="line.46"> * application. Since information about States doesn't change very often, you</a> +<span class="sourceLineNo">047</span><a id="line.47"> * could store this information in the Global Cache and decrease the overhead of</a> +<span class="sourceLineNo">048</span><a id="line.48"> * hitting the database everytime you need State information.</a> +<span class="sourceLineNo">049</span><a id="line.49"> *</a> +<span class="sourceLineNo">050</span><a id="line.50"> * @author <a href="mailto:[email protected]">Dave Bryson</a></a> +<span class="sourceLineNo">051</span><a id="line.51"> * @author <a href="mailto:[email protected]">Jon S. Stevens</a></a> +<span class="sourceLineNo">052</span><a id="line.52"> * @author <a href="mailto:[email protected]">John Thorhauer</a></a> +<span class="sourceLineNo">053</span><a id="line.53"> * @author <a href="mailto:[email protected]">Henning P. Schmiedehausen</a></a> +<span class="sourceLineNo">054</span><a id="line.54"> * @author <a href="mailto:[email protected]">Eric Pugh</a></a> +<span class="sourceLineNo">055</span><a id="line.55"> * @author <a href="mailto:[email protected]">Peter CourefreshableCachedObjectux</a></a> +<span class="sourceLineNo">056</span><a id="line.56"> * @version $Id: DefaultGlobalCacheService.java 1890338 2021-05-31 10:31:19Z gk $</a> +<span class="sourceLineNo">057</span><a id="line.57"> */</a> +<span class="sourceLineNo">058</span><a id="line.58">public class DefaultGlobalCacheService extends AbstractLogEnabled implements</a> +<span class="sourceLineNo">059</span><a id="line.59"> GlobalCacheService, Runnable, Configurable, Initializable, Disposable,</a> +<span class="sourceLineNo">060</span><a id="line.60"> ThreadSafe</a> +<span class="sourceLineNo">061</span><a id="line.61">{</a> +<span class="sourceLineNo">062</span><a id="line.62"> /**</a> +<span class="sourceLineNo">063</span><a id="line.63"> * Initial size of hash table Value must be &gt; 0. Default = 20</a> +<span class="sourceLineNo">064</span><a id="line.64"> */</a> +<span class="sourceLineNo">065</span><a id="line.65"> public static final int DEFAULT_INITIAL_CACHE_SIZE = 20;</a> +<span class="sourceLineNo">066</span><a id="line.66"></a> +<span class="sourceLineNo">067</span><a id="line.67"> /**</a> +<span class="sourceLineNo">068</span><a id="line.68"> * The property for the InitalCacheSize</a> +<span class="sourceLineNo">069</span><a id="line.69"> */</a> +<span class="sourceLineNo">070</span><a id="line.70"> public static final String INITIAL_CACHE_SIZE = "cacheInitialSize";</a> +<span class="sourceLineNo">071</span><a id="line.71"></a> +<span class="sourceLineNo">072</span><a id="line.72"> /**</a> +<span class="sourceLineNo">073</span><a id="line.73"> * The property for the Cache check frequency</a> +<span class="sourceLineNo">074</span><a id="line.74"> */</a> +<span class="sourceLineNo">075</span><a id="line.75"> public static final String CACHE_CHECK_FREQUENCY = "cacheCheckFrequency";</a> +<span class="sourceLineNo">076</span><a id="line.76"></a> +<span class="sourceLineNo">077</span><a id="line.77"> /**</a> +<span class="sourceLineNo">078</span><a id="line.78"> * Cache check frequency in Millis (1000 Millis = 1 second). Value must be &gt;</a> +<span class="sourceLineNo">079</span><a id="line.79"> * 0. Default = 5 seconds</a> +<span class="sourceLineNo">080</span><a id="line.80"> */</a> +<span class="sourceLineNo">081</span><a id="line.81"> public static final long DEFAULT_CACHE_CHECK_FREQUENCY = 5000; // 5 seconds</a> +<span class="sourceLineNo">082</span><a id="line.82"></a> +<span class="sourceLineNo">083</span><a id="line.83"> /** The cache. */</a> +<span class="sourceLineNo">084</span><a id="line.84"> protected transient ConcurrentHashMap<String, CachedObject<?>> cache = null;</a> +<span class="sourceLineNo">085</span><a id="line.85"></a> +<span class="sourceLineNo">086</span><a id="line.86"> /**</a> +<span class="sourceLineNo">087</span><a id="line.87"> * cacheCheckFrequency (default - 5 seconds)</a> +<span class="sourceLineNo">088</span><a id="line.88"> */</a> +<span class="sourceLineNo">089</span><a id="line.89"> private transient long cacheCheckFrequency;</a> +<span class="sourceLineNo">090</span><a id="line.90"></a> +<span class="sourceLineNo">091</span><a id="line.91"> /**</a> +<span class="sourceLineNo">092</span><a id="line.92"> * cacheInitialSize (default - 20)</a> +<span class="sourceLineNo">093</span><a id="line.93"> */</a> +<span class="sourceLineNo">094</span><a id="line.94"> private transient int cacheInitialSize;</a> +<span class="sourceLineNo">095</span><a id="line.95"></a> +<span class="sourceLineNo">096</span><a id="line.96"> /** thread for removing stale items from the cache */</a> +<span class="sourceLineNo">097</span><a id="line.97"> private transient Thread houseKeepingThread;</a> +<span class="sourceLineNo">098</span><a id="line.98"></a> +<span class="sourceLineNo">099</span><a id="line.99"> /** flag to stop the housekeeping thread when the component is disposed. */</a> +<span class="sourceLineNo">100</span><a id="line.100"> private transient boolean continueThread;</a> +<span class="sourceLineNo">101</span><a id="line.101"> </a> +<span class="sourceLineNo">102</span><a id="line.102"> public DefaultGlobalCacheService()</a> +<span class="sourceLineNo">103</span><a id="line.103"> {</a> +<span class="sourceLineNo">104</span><a id="line.104"> </a> +<span class="sourceLineNo">105</span><a id="line.105"> }</a> +<span class="sourceLineNo">106</span><a id="line.106"></a> +<span class="sourceLineNo">107</span><a id="line.107"> /**</a> +<span class="sourceLineNo">108</span><a id="line.108"> * Get the Cache Check Frequency in milliseconds</a> +<span class="sourceLineNo">109</span><a id="line.109"> *</a> +<span class="sourceLineNo">110</span><a id="line.110"> * @return the time between two cache check runs in milliseconds</a> +<span class="sourceLineNo">111</span><a id="line.111"> */</a> +<span class="sourceLineNo">112</span><a id="line.112"> public long getCacheCheckFrequency()</a> +<span class="sourceLineNo">113</span><a id="line.113"> {</a> +<span class="sourceLineNo">114</span><a id="line.114"> return this.cacheCheckFrequency;</a> +<span class="sourceLineNo">115</span><a id="line.115"> }</a> +<span class="sourceLineNo">116</span><a id="line.116"></a> +<span class="sourceLineNo">117</span><a id="line.117"> /**</a> +<span class="sourceLineNo">118</span><a id="line.118"> * Returns an item from the cache. /** Returns an item from the cache.</a> +<span class="sourceLineNo">119</span><a id="line.119"> * RefreshableCachedObject will be refreshed if it is expired and not</a> +<span class="sourceLineNo">120</span><a id="line.120"> * untouched.</a> +<span class="sourceLineNo">121</span><a id="line.121"> *</a> +<span class="sourceLineNo">122</span><a id="line.122"> * @param objectId</a> +<span class="sourceLineNo">123</span><a id="line.123"> * The key of the stored object.</a> +<span class="sourceLineNo">124</span><a id="line.124"> * @return The object from the cache.</a> +<span class="sourceLineNo">125</span><a id="line.125"> * @throws ObjectExpiredException</a> +<span class="sourceLineNo">126</span><a id="line.126"> * when either the object is not in the cache or it has</a> +<span 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id="line.138"> }</a> +<span class="sourceLineNo">139</span><a id="line.139"> if (cachedObject.isStale())</a> +<span class="sourceLineNo">140</span><a id="line.140"> {</a> +<span class="sourceLineNo">141</span><a id="line.141"> if (cachedObject instanceof RefreshableCachedObject)</a> +<span class="sourceLineNo">142</span><a id="line.142"> {</a> +<span class="sourceLineNo">143</span><a id="line.143"> RefreshableCachedObject<?> refreshableCachedObj = (RefreshableCachedObject<?>) cachedObject;</a> +<span class="sourceLineNo">144</span><a id="line.144"> if (refreshableCachedObj.isUntouched())</a> +<span class="sourceLineNo">145</span><a id="line.145"> {</a> +<span class="sourceLineNo">146</span><a id="line.146"> throw new ObjectExpiredException();</a> +<span class="sourceLineNo">147</span><a id="line.147"> }</a> +<span class="sourceLineNo">148</span><a id="line.148"> // Refresh Object</a> +<span class="sourceLineNo">149</span><a id="line.149"> refreshableCachedObj.refresh();</a> +<span 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class="sourceLineNo">163</span><a id="line.163"> // notify it that it's being accessed.</a> +<span class="sourceLineNo">164</span><a id="line.164"> RefreshableCachedObject<?> refreshableCachedObj = (RefreshableCachedObject<?>) cachedObject;</a> +<span class="sourceLineNo">165</span><a id="line.165"> refreshableCachedObj.touch();</a> +<span class="sourceLineNo">166</span><a id="line.166"> }</a> +<span class="sourceLineNo">167</span><a id="line.167"> return cachedObject;</a> +<span class="sourceLineNo">168</span><a id="line.168"> }</a> +<span class="sourceLineNo">169</span><a id="line.169"></a> +<span class="sourceLineNo">170</span><a id="line.170"> /**</a> +<span class="sourceLineNo">171</span><a id="line.171"> * Adds an object to the cache.</a> +<span class="sourceLineNo">172</span><a id="line.172"> *</a> +<span class="sourceLineNo">173</span><a id="line.173"> * @param objectId</a> +<span class="sourceLineNo">174</span><a id="line.174"> * The key to store the object by.</a> +<span 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class="sourceLineNo">212</span><a id="line.212"> {</a> +<span class="sourceLineNo">213</span><a id="line.213"> ArrayList<String> keys = new ArrayList<>(this.cache.size());</a> +<span class="sourceLineNo">214</span><a id="line.214"> for (String key : this.cache.keySet())</a> +<span class="sourceLineNo">215</span><a id="line.215"> {</a> +<span class="sourceLineNo">216</span><a id="line.216"> try</a> +<span class="sourceLineNo">217</span><a id="line.217"> {</a> +<span class="sourceLineNo">218</span><a id="line.218"> getObject(key);</a> +<span class="sourceLineNo">219</span><a id="line.219"> }</a> +<span class="sourceLineNo">220</span><a id="line.220"> catch (ObjectExpiredException oee)</a> +<span class="sourceLineNo">221</span><a id="line.221"> {</a> +<span class="sourceLineNo">222</span><a id="line.222"> // this is OK we just do not want this key</a> +<span class="sourceLineNo">223</span><a id="line.223"> continue;</a> +<span class="sourceLineNo">224</span><a id="line.224"> }</a> +<span 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id="line.237"> {</a> +<span class="sourceLineNo">238</span><a id="line.238"> final ArrayList<CachedObject<?>> objects = new ArrayList<>(this.cache.size());</a> +<span class="sourceLineNo">239</span><a id="line.239"> for (String key : this.cache.keySet())</a> +<span class="sourceLineNo">240</span><a id="line.240"> {</a> +<span class="sourceLineNo">241</span><a id="line.241"> CachedObject<?> cachedObject = null;</a> +<span class="sourceLineNo">242</span><a id="line.242"> try</a> +<span class="sourceLineNo">243</span><a id="line.243"> {</a> +<span class="sourceLineNo">244</span><a id="line.244"> // only add non-null objects</a> +<span class="sourceLineNo">245</span><a id="line.245"> cachedObject = getObject(key);</a> +<span class="sourceLineNo">246</span><a id="line.246"> if ( cachedObject != null )</a> +<span class="sourceLineNo">247</span><a id="line.247"> {</a> +<span class="sourceLineNo">248</span><a id="line.248"> objects.add(cachedObject);</a> +<span 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Frequency is</a> +<span class="sourceLineNo">262</span><a id="line.262"> * determined by the cacheCheckFrequency property.</a> +<span class="sourceLineNo">263</span><a id="line.263"> */</a> +<span class="sourceLineNo">264</span><a id="line.264"> @Override</a> +<span class="sourceLineNo">265</span><a id="line.265"> public void run()</a> +<span class="sourceLineNo">266</span><a id="line.266"> {</a> +<span class="sourceLineNo">267</span><a id="line.267"> while (this.continueThread)</a> +<span class="sourceLineNo">268</span><a id="line.268"> {</a> +<span class="sourceLineNo">269</span><a id="line.269"> // Sleep for amount of time set in cacheCheckFrequency -</a> +<span class="sourceLineNo">270</span><a id="line.270"> // default = 5 seconds.</a> +<span class="sourceLineNo">271</span><a id="line.271"> synchronized (this)</a> +<span class="sourceLineNo">272</span><a id="line.272"> {</a> +<span class="sourceLineNo">273</span><a id="line.273"> try</a> +<span class="sourceLineNo">274</span><a 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and remove or refresh stale objects.</a> +<span class="sourceLineNo">289</span><a id="line.289"> */</a> +<span class="sourceLineNo">290</span><a id="line.290"> public void clearCache()</a> +<span class="sourceLineNo">291</span><a id="line.291"> {</a> +<span class="sourceLineNo">292</span><a id="line.292"> List<String> refreshThese = new ArrayList<>(20);</a> +<span class="sourceLineNo">293</span><a id="line.293"> // Sync on this object so that other threads do not</a> +<span class="sourceLineNo">294</span><a id="line.294"> // change the Hashtable while enumerating over it.</a> +<span class="sourceLineNo">295</span><a id="line.295"> for (String key : this.cache.keySet())</a> +<span class="sourceLineNo">296</span><a id="line.296"> {</a> +<span class="sourceLineNo">297</span><a id="line.297"> final CachedObject<?> cachedObject = this.cache.get(key);</a> +<span class="sourceLineNo">298</span><a id="line.298"> if (cachedObject instanceof RefreshableCachedObject)</a> +<span class="sourceLineNo">299</span><a id="line.299"> {</a> +<span class="sourceLineNo">300</span><a id="line.300"> RefreshableCachedObject<?> refreshableObject = (RefreshableCachedObject<?>) cachedObject;</a> +<span class="sourceLineNo">301</span><a id="line.301"> if (refreshableObject.isUntouched())</a> +<span class="sourceLineNo">302</span><a id="line.302"> {</a> +<span class="sourceLineNo">303</span><a id="line.303"> this.cache.remove(key);</a> +<span class="sourceLineNo">304</span><a id="line.304"> }</a> +<span class="sourceLineNo">305</span><a id="line.305"> else if (refreshableObject.isStale())</a> +<span class="sourceLineNo">306</span><a id="line.306"> {</a> +<span class="sourceLineNo">307</span><a id="line.307"> // to prolong holding the lock on this object</a> +<span class="sourceLineNo">308</span><a id="line.308"> refreshThese.add(key);</a> +<span class="sourceLineNo">309</span><a id="line.309"> }</a> +<span class="sourceLineNo">310</span><a id="line.310"> }</a> +<span 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+<span class="sourceLineNo">323</span><a id="line.323"> }</a> +<span class="sourceLineNo">324</span><a id="line.324"></a> +<span class="sourceLineNo">325</span><a id="line.325"> /**</a> +<span class="sourceLineNo">326</span><a id="line.326"> * Returns the number of objects currently stored in the cache</a> +<span class="sourceLineNo">327</span><a id="line.327"> *</a> +<span class="sourceLineNo">328</span><a id="line.328"> * @return int number of object in the cache</a> +<span class="sourceLineNo">329</span><a id="line.329"> */</a> +<span class="sourceLineNo">330</span><a id="line.330"> @Override</a> +<span class="sourceLineNo">331</span><a id="line.331"> public int getNumberOfObjects()</a> +<span class="sourceLineNo">332</span><a id="line.332"> {</a> +<span class="sourceLineNo">333</span><a id="line.333"> return this.cache.size();</a> +<span class="sourceLineNo">334</span><a id="line.334"> }</a> +<span class="sourceLineNo">335</span><a id="line.335"></a> +<span class="sourceLineNo">336</span><a id="line.336"> /**</a> +<span class="sourceLineNo">337</span><a id="line.337"> * Returns the current size of the cache.</a> +<span class="sourceLineNo">338</span><a id="line.338"> *</a> +<span class="sourceLineNo">339</span><a id="line.339"> * @return int representing current cache size in number of bytes</a> +<span class="sourceLineNo">340</span><a id="line.340"> */</a> +<span class="sourceLineNo">341</span><a id="line.341"> @Override</a> +<span class="sourceLineNo">342</span><a id="line.342"> public int getCacheSize() throws IOException</a> +<span class="sourceLineNo">343</span><a id="line.343"> {</a> +<span class="sourceLineNo">344</span><a id="line.344"> final ByteArrayOutputStream baos = new ByteArrayOutputStream();</a> +<span class="sourceLineNo">345</span><a id="line.345"> final ObjectOutputStream out = new ObjectOutputStream(baos);</a> +<span class="sourceLineNo">346</span><a id="line.346"> out.writeObject(this.cache);</a> +<span class="sourceLineNo">347</span><a id="line.347"> out.flush();</a> +<span class="sourceLineNo">348</span><a id="line.348"> //</a> +<span class="sourceLineNo">349</span><a id="line.349"> // Subtract 4 bytes from the length, because the serialization</a> +<span class="sourceLineNo">350</span><a id="line.350"> // magic number (2 bytes) and version number (2 bytes) are</a> +<span class="sourceLineNo">351</span><a id="line.351"> // both written to the stream before the object</a> +<span class="sourceLineNo">352</span><a id="line.352"> //</a> +<span class="sourceLineNo">353</span><a id="line.353"> return baos.toByteArray().length - 4;</a> +<span class="sourceLineNo">354</span><a id="line.354"> }</a> +<span class="sourceLineNo">355</span><a id="line.355"></a> +<span class="sourceLineNo">356</span><a id="line.356"> /**</a> +<span class="sourceLineNo">357</span><a id="line.357"> * Flush the cache of all objects.</a> +<span class="sourceLineNo">358</span><a id="line.358"> */</a> +<span class="sourceLineNo">359</span><a id="line.359"> @Override</a> +<span class="sourceLineNo">360</span><a id="line.360"> public void flushCache()</a> +<span class="sourceLineNo">361</span><a id="line.361"> {</a> +<span class="sourceLineNo">362</span><a id="line.362"> this.cache.clear();</a> +<span class="sourceLineNo">363</span><a id="line.363"> }</a> +<span class="sourceLineNo">364</span><a id="line.364"></a> +<span class="sourceLineNo">365</span><a id="line.365"> // ---------------- Avalon Lifecycle Methods ---------------------</a> +<span class="sourceLineNo">366</span><a id="line.366"> /**</a> +<span class="sourceLineNo">367</span><a id="line.367"> * Avalon component lifecycle method</a> +<span class="sourceLineNo">368</span><a id="line.368"> */</a> +<span class="sourceLineNo">369</span><a id="line.369"> @Override</a> +<span class="sourceLineNo">370</span><a id="line.370"> public void configure(Configuration conf) throws ConfigurationException</a> +<span class="sourceLineNo">371</span><a id="line.371"> {</a> +<span class="sourceLineNo">372</span><a id="line.372"> this.cacheCheckFrequency = conf.getAttributeAsLong(</a> +<span class="sourceLineNo">373</span><a id="line.373"> CACHE_CHECK_FREQUENCY, DEFAULT_CACHE_CHECK_FREQUENCY);</a> +<span class="sourceLineNo">374</span><a id="line.374"> this.cacheInitialSize = conf.getAttributeAsInteger(INITIAL_CACHE_SIZE,</a> +<span class="sourceLineNo">375</span><a id="line.375"> DEFAULT_INITIAL_CACHE_SIZE);</a> +<span class="sourceLineNo">376</span><a id="line.376"> }</a> +<span class="sourceLineNo">377</span><a id="line.377"></a> +<span class="sourceLineNo">378</span><a id="line.378"> /**</a> +<span class="sourceLineNo">379</span><a id="line.379"> * Avalon component lifecycle method</a> +<span class="sourceLineNo">380</span><a id="line.380"> */</a> +<span class="sourceLineNo">381</span><a id="line.381"> @Override</a> +<span class="sourceLineNo">382</span><a id="line.382"> public void initialize() throws Exception</a> +<span class="sourceLineNo">383</span><a id="line.383"> {</a> +<span class="sourceLineNo">384</span><a id="line.384"> this.cache = new ConcurrentHashMap<>(this.cacheInitialSize);</a> +<span class="sourceLineNo">385</span><a id="line.385"> // Start housekeeping thread.</a> +<span class="sourceLineNo">386</span><a id="line.386"> this.continueThread = true;</a> +<span class="sourceLineNo">387</span><a id="line.387"> this.houseKeepingThread = new Thread(this);</a> +<span class="sourceLineNo">388</span><a id="line.388"> // Indicate that this is a system thread. JVM will quit only when</a> +<span class="sourceLineNo">389</span><a id="line.389"> // there are no more active user threads. Settings threads spawned</a> +<span class="sourceLineNo">390</span><a id="line.390"> // internally by Turbine as daemons allows commandline applications</a> +<span class="sourceLineNo">391</span><a id="line.391"> // using Turbine to terminate in an orderly manner.</a> +<span class="sourceLineNo">392</span><a id="line.392"> this.houseKeepingThread.setDaemon(true);</a> +<span class="sourceLineNo">393</span><a id="line.393"> this.houseKeepingThread.start();</a> +<span class="sourceLineNo">394</span><a id="line.394"> }</a> +<span class="sourceLineNo">395</span><a id="line.395"></a> +<span class="sourceLineNo">396</span><a id="line.396"> /**</a> +<span class="sourceLineNo">397</span><a id="line.397"> * Avalon component lifecycle method</a> +<span class="sourceLineNo">398</span><a id="line.398"> */</a> +<span class="sourceLineNo">399</span><a id="line.399"> @Override</a> +<span class="sourceLineNo">400</span><a id="line.400"> public void dispose()</a> +<span class="sourceLineNo">401</span><a id="line.401"> {</a> +<span class="sourceLineNo">402</span><a id="line.402"> synchronized (this)</a> +<span class="sourceLineNo">403</span><a id="line.403"> {</a> +<span class="sourceLineNo">404</span><a id="line.404"> this.continueThread = false;</a> +<span class="sourceLineNo">405</span><a id="line.405"> notifyAll();</a> +<span class="sourceLineNo">406</span><a id="line.406"> }</a> +<span class="sourceLineNo">407</span><a id="line.407"> }</a> +<span class="sourceLineNo">408</span><a id="line.408">}</a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</main> +</body> +</html> \ No newline at end of file
