If this is the case, you have to deploy a servlet in your webapp which will get initialized when the app is getting deployed, and in the init method of that servlet, you need to call CacheManager.removeCache(cacheName)
On Wed, Oct 29, 2014 at 6:28 AM, Gayashan Amarasinghe <[email protected]> wrote: > Wouldn't it be a valid scenario to change the cache expiry time as in my > case? As you've said, I understand that we cannot expect every new version > of the app to have cache configuration changes. But during testing or > initial development i think it could happen. Even in that case this is not > a blocking issue i think. I just want to understand how we should work with > that. :) > > On Wed, Oct 29, 2014 at 6:48 PM, Afkham Azeez <[email protected]> wrote: > >> It doesn't happen like that in practice. The developer suddenly doesn't >> change the mind and change the cache configuration on the fly. These >> parameters are fixed, and will be set upon cache creation. >> >> On Wed, Oct 29, 2014 at 6:15 AM, Gayashan Amarasinghe <[email protected]> >> wrote: >> >>> Thanks Azeez. Understood. However in case the developer wanted to change >>> the cache configuration of an existing cache what is the recommended >>> approach? Only possible way would be to make the cache have a different >>> name? >>> >>> On Wed, Oct 29, 2014 at 6:37 PM, Afkham Azeez <[email protected]> wrote: >>> >>>> You cannot call the builder twice when the cache already exists. Other >>>> teams such as IS use both the getCache & the builder method with proper >>>> synchronization which will return the cache if it exists, or will build & >>>> return the cache with custom parameter if it does not exist. I will try to >>>> write a sample code segment and publish on my blog today. That can be made >>>> into a class called CachingUtil or something. >>>> >>>> Azeez >>>> >>>> On Wed, Oct 29, 2014 at 5:59 AM, Gayashan Amarasinghe < >>>> [email protected]> wrote: >>>> >>>>> Hi Azeez, >>>>> >>>>> During Carbon testing i've created a simple web app that utilize the >>>>> cache (source code at [1]). In this web app I've created a cache with >>>>> custom expiry and deployed it in a cluster and hit it using jmeter. During >>>>> testing i changed the expiry time of the cache prorgrammatically and tried >>>>> to redeploy the web app. But since the server was not restarted the cache >>>>> created by the previous web app was already there. (I didn't change the >>>>> name of the cache manager or the cache) As a result the following >>>>> exception >>>>> was thrown. >>>>> >>>>> TID: [-1234] [] [2014-10-29 12:27:57,185] ERROR >>>>> {org.apache.catalina.core.StandardWrapperValve} - Allocate exception for >>>>> servlet org.wso2.carbon.CarbonTest.CachingTest >>>>> {org.apache.catalina.core.StandardWrapperValve} >>>>> javax.cache.CacheException: Cache expiringCache already exists >>>>> at >>>>> org.wso2.carbon.caching.impl.CarbonCacheManager.createCacheBuilder(CarbonCacheManager.java:96) >>>>> at org.wso2.carbon.CarbonTest.CachingTest.init(CachingTest.java:38) >>>>> at javax.servlet.GenericServlet.init(GenericServlet.java:158) >>>>> at >>>>> org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1279) >>>>> at >>>>> org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1192) >>>>> at >>>>> org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:864) >>>>> at >>>>> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:134) >>>>> at >>>>> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) >>>>> at >>>>> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) >>>>> at >>>>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) >>>>> at >>>>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) >>>>> at >>>>> org.wso2.carbon.statistics.webapp.RequestIntercepterValve.invoke(RequestIntercepterValve.java:43) >>>>> at >>>>> org.wso2.carbon.bam.webapp.stat.publisher.WebAppStatisticPublisherValve.invoke(WebAppStatisticPublisherValve.java:104) >>>>> at >>>>> org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:178) >>>>> at >>>>> org.wso2.carbon.tomcat.ext.valves.CarbonTomcatValve$1.invoke(CarbonTomcatValve.java:47) >>>>> at >>>>> org.wso2.carbon.webapp.mgt.GhostWebappDeployerValve.invoke(GhostWebappDeployerValve.java:141) >>>>> at >>>>> org.wso2.carbon.webapp.mgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:56) >>>>> at >>>>> org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:47) >>>>> at >>>>> org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:141) >>>>> at >>>>> org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:154) >>>>> at >>>>> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) >>>>> at >>>>> org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:52) >>>>> at >>>>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) >>>>> at >>>>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) >>>>> at >>>>> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) >>>>> at >>>>> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) >>>>> at >>>>> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1721) >>>>> at >>>>> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1679) >>>>> at >>>>> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) >>>>> at >>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) >>>>> at java.lang.Thread.run(Thread.java:662) >>>>> >>>>> >>>>> This is going to be an issue when developers try to redeploy a webapp >>>>> with modifications to the cache configurations. Is this a bug or the >>>>> intended behavior? AFAIU we should not let this happen. WDYT? >>>>> >>>>> [1] >>>>> https://github.com/GayashanNA/CarbonCachingTestWebapp/blob/master/src/main/java/org/wso2/carbon/CarbonTest/CachingTest.java >>>>> >>>>> ​Thanks. >>>>> /Gayashan​ >>>>> >>>>> -- >>>>> *Gayashan Amarasinghe* >>>>> Software Engineer | Platform TG >>>>> WSO2, Inc. | http://wso2.com >>>>> lean. enterprise. middleware >>>>> >>>>> Mobile : +94718314517 >>>>> Blog : gayashan-a.blogspot.com >>>>> >>>> >>>> >>>> >>>> -- >>>> *Afkham Azeez* >>>> Director of Architecture; WSO2, Inc.; http://wso2.com >>>> Member; Apache Software Foundation; http://www.apache.org/ >>>> * <http://www.apache.org/>* >>>> *email: **[email protected]* <[email protected]> >>>> * cell: +94 77 3320919 <%2B94%2077%203320919>blog: * >>>> *http://blog.afkham.org* <http://blog.afkham.org> >>>> *twitter: **http://twitter.com/afkham_azeez* >>>> <http://twitter.com/afkham_azeez> >>>> *linked-in: **http://lk.linkedin.com/in/afkhamazeez >>>> <http://lk.linkedin.com/in/afkhamazeez>* >>>> >>>> *Lean . Enterprise . Middleware* >>>> >>> >>> >>> >>> -- >>> *Gayashan Amarasinghe* >>> Software Engineer | Platform TG >>> WSO2, Inc. | http://wso2.com >>> lean. enterprise. middleware >>> >>> Mobile : +94718314517 >>> Blog : gayashan-a.blogspot.com >>> >> >> >> >> -- >> *Afkham Azeez* >> Director of Architecture; WSO2, Inc.; http://wso2.com >> Member; Apache Software Foundation; http://www.apache.org/ >> * <http://www.apache.org/>* >> *email: **[email protected]* <[email protected]> >> * cell: +94 77 3320919 <%2B94%2077%203320919>blog: * >> *http://blog.afkham.org* <http://blog.afkham.org> >> *twitter: **http://twitter.com/afkham_azeez* >> <http://twitter.com/afkham_azeez> >> *linked-in: **http://lk.linkedin.com/in/afkhamazeez >> <http://lk.linkedin.com/in/afkhamazeez>* >> >> *Lean . Enterprise . Middleware* >> > > > > -- > *Gayashan Amarasinghe* > Software Engineer | Platform TG > WSO2, Inc. | http://wso2.com > lean. enterprise. middleware > > Mobile : +94718314517 > Blog : gayashan-a.blogspot.com > -- *Afkham Azeez* Director of Architecture; WSO2, Inc.; http://wso2.com Member; Apache Software Foundation; http://www.apache.org/ * <http://www.apache.org/>* *email: **[email protected]* <[email protected]> * cell: +94 77 3320919blog: **http://blog.afkham.org* <http://blog.afkham.org> *twitter: **http://twitter.com/afkham_azeez* <http://twitter.com/afkham_azeez> *linked-in: **http://lk.linkedin.com/in/afkhamazeez <http://lk.linkedin.com/in/afkhamazeez>* *Lean . Enterprise . Middleware*
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