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<p><em>2016-12-18</em></p> - <p><em>2016-12-19</em></p> -- -- <p><div id="preamble"> --<div class="sectionbody"> --<!-- toc disabled --> --</div> --</div> --<div class="sect1"> --<h2 id="Optional">User Filtering (Extension Module)</h2> --<div class="sectionbody"> --<div class="sect2"> --<h3 id="_overview">Overview</h3> --<div class="paragraph"> --<p>The Tamaya filter module provides a simple singleton accessor that allows to explicitly add PropertyFilter instances --active on the current thread only. This can be very useful in many scenarios. Additionally this module adds --standard filters that hide metadata entries when the full configuration map is accessed. When keys are accessed --explicitily no filtering is applied and everything is visible.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_compatibility">Compatibility</h3> --<div class="paragraph"> --<p>The module is based on Java 7, so it will not run on Java 7 and beyond.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_installation">Installation</h3> --<div class="paragraph"> --<p>To benefit from configuration builder support you only must add the corresponding dependency to your module:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> -- <groupId>org.apache.tamaya.ext</groupId> -- <artifactId>tamaya-filter</artifactId> -- <version>{tamaya_version}</version> --</dependency></code></pre> --</div> --</div> --</div> --<div class="sect2"> --<h3 id="_the_extensions_provided">The Extensions Provided</h3> --<div class="paragraph"> --<p>Tamaya Filter comes basically with 3 artifacts:</p> --</div> --<div class="ulist"> --<ul> --<li> --<p>The org.apache.tamaya.filter.ConfigurationFilter provides several static methods to register PropertyFilter --instances on the current thread.</p> --</li> --<li> --<p>The org.apache.tamaya.filter.DefaultMetdataFilter is a PropertyFilter with hides all entries starting with --an underscore ('_'), when a full property map is accessed.</p> --</li> --</ul> --</div> --</div> --<div class="sect2"> --<h3 id="_the_configurationfilter">The ConfigurationFilter</h3> --<div class="paragraph"> --<p>The accessor mentioned implements the API for for adding PropertyFilters to the current thread (as thread local):</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final class ConfigurationFilter implements PropertyFilter{ -- -- ... -- -- /** -- * Seactivates metadata filtering also on global map access for this thread. -- * @see #clearFilters() -- * @param active true,to enable metadata filtering (default). -- */ -- public static void setFilterMetadata(boolean active); -- -- /** -- * Access the filtering configuration that is used for filtering single property values accessed. -- * @return the filtering config, never null. -- */ -- public static FilterContext getSingleFilterContext(); -- -- /** -- * Access the filtering configuration that is used for filtering configuration properties accessed as full -- * map. -- * @return the filtering config, never null. -- */ -- public static FilterContext getMapFilters(); -- -- /** -- * Removes all programmable filters active on the current thread. -- */ -- public static void clearFilters(); -- -- ... -- --}</code></pre> --</div> --</div> --<div class="paragraph"> --<p>For using regular expression when filtering configuration keys a corresponding implementation of a PropertyFilter --is part of this module, So you can add a customized filter as follows:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">try { -- ConfigurationFilter.getMapFilters().addFilter(new myFilter()); -- -- // do your code with filtering active --} --finally { -- // cleanup -- ConfigurationFilter.clearFilters(); --}</code></pre> --</div> --</div> --<div class="paragraph"> --<p>The FilterContext is a simple structure just providing some handy accessors to the dynamic thread-local --managed filters:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final class FilterContext implements PropertyFilter { -- -- public void addIncludes(PropertyFilter filter); -- public void addExcludes(int pos, PropertyFilter filter); -- public PropertyFilter removeFilter(int pos); -- public void clearFilters(); -- public void setIncludes(PropertyFilter... filters); -- public void setExcludes(Collection<PropertyFilter> filters); -- public List<PropertyFilter> getFilters(); -- --}</code></pre> --</div> --</div> --</div> --</div> --</div></p> -- -- <hr /> -- </div> -- </div> -- <div> -- <div id="push"></div> -- -- <div id="footer"> -- <div class="container"> -- <p class="muted credit">© 2014-2016 Apache Software Foundation | Mixed with <a href="http://getbootstrap.com/";>Bootstrap v3.1.1</a> -- | Baked with <a href="http://jbake.org";>JBake <span>v2.5.0</span></a> -- at <span>2016-12-19</span> -- </p> -- <p> -- <b>Disclaimer</b> -- Apache Tamaya (incubating) is an effort undergoing -- incubation at -- The Apache Software Foundation (ASF), sponsored by -- the name of Apache Incubator. Incubation is required of -- all newly accepted projects until a further review indicates -- that the infrastructure, communications, and decision making -- process have stabilized in a manner consistent with other -- successful ASF projects. While incubation status is not -- necessarily a reflection of the completeness or stability of -- the code, it does indicate that the project has yet to -- be fully endorsed by the ASF.<br /> -- <a href="http://incubator.apache.org/guides/website.html"; style="border:0px;" target="_target"><img class="incubator-logo" src="../../logos/egg-logo2.png"/></a> -- </p> -- </div> -- </div> -- -- <!-- Le javascript -- ================================================== --> -- <!-- Placed at the end of the document so the pages load faster --> -- <script src="../../js/jquery-1.11.1.min.js"></script> -- <script src="../../js/bootstrap.min.js"></script> -- <script src="../../js/prettify.js"></script> -- -- </div> -- </body> --</html>
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<p><em>2016-12-18</em></p> - <p><em>2016-12-19</em></p> -- -- <p><div id="preamble"> --<div class="sectionbody"> --<!-- toc disabled --> --</div> --</div> --<div class="sect1"> --<h2 id="Core">Tamaya Formats (Extension Module)</h2> --<div class="sectionbody"> --<div class="sect2"> --<h3 id="_overview">Overview</h3> --<div class="paragraph"> --<p>Tamaya Formats is an extension module. Refer to the <a href="modules.html">extensions documentation</a> for further details.</p> --</div> --<div class="paragraph"> --<p>Tamaya Formats provides an abstraction for configuration formats provding the following benefits:</p> --</div> --<div class="ulist"> --<ul> --<li> --<p>Parsing of resources in can be implemented separately from interpreting the different aspects/parts parsed. As an --example a file format can define different sections. Depending on the company specific semantics of the sections --a different set of PropertySource instances must be created.</p> --</li> --<li> --<p>Similarly the configuration abstraction can also be used as an interface for integrating Tamaya with alternate --frameworks that provide logic for reading configuration files, such as Apache commons.configuration.</p> --</li> --</ul> --</div> --</div> --<div class="sect2"> --<h3 id="_compatibility">Compatibility</h3> --<div class="paragraph"> --<p>The module is based on Java 7, so it can be used with Java 7 and beyond.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_installation">Installation</h3> --<div class="paragraph"> --<p>To benefit from dynamic value resolution you only must add the corresponding dependency to your module:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> -- <groupId>org.apache.tamaya.ext</groupId> -- <artifactId>tamaya-formats</artifactId> -- <version>{tamaya_version}</version> --</dependency></code></pre> --</div> --</div> --</div> --<div class="sect2"> --<h3 id="_the_idea">The Idea</h3> --<div class="paragraph"> --<p>Formats should be reusable, meaning you should have to write a format parser only once and then be able to map the data read into whatever --data structure (in our cases: property sources).</p> --</div> --<div class="sect3"> --<h4 id="_configurationdata">ConfigurationData</h4> --<div class="paragraph"> --<p>Configuration formats can be very different. Some are simple key/value pairs, whereas other also consist of multiple sections (e.g. ini-files) or --hierarchical data (e.g. yaml, xml). This is solved in Tamaya by mapping the configuration read into a normalized intermediary format called --ConfigurationData:</p> --</div> --<div class="listingblock"> --<div class="title">ConfigurationData</div> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final class ConfigurationData { -- -- public ConfigurationFormat getFormat(); -- public String getResource(); -- -- public Set<String> getSectionNames(); -- public Map<String,String> getSection(String name); -- -- public boolean hasDefaultProperties(); -- public Map<String,String> getDefaultProperties(); -- public Map<String,String> getCombinedProperties(); -- -- public boolean isEmpty(); --}</code></pre> --</div> --</div> --<div class="paragraph"> --<p>In detail the data read from a file is organized into <em>sections</em> as follows:</p> --</div> --<div class="ulist"> --<ul> --<li> --<p>with getResource() and getFormat() the underlying resource and the format that read this data can be accessed.</p> --</li> --<li> --<p>properties can be owned by</p> --<div class="ulist"> --<ul> --<li> --<p>named sections</p> --</li> --<li> --<p>an (unnamed) default section</p> --</li> --</ul> --</div> --</li> --<li> --<p>each section section contains a map of properties. Hereby the same key can be part of the default section and multiple --named sections, depending on the configuration format.</p> --</li> --<li> --<p>The method getSectionNames() returns a set of all section names.</p> --</li> --<li> --<p>With getSection(String name) a named section can be accessed.</p> --</li> --<li> --<p>With getDefaultSection() the 'default' section can be accessed. This is a convenience method.</p> --</li> --<li> --<p>With getCombinedProperties() a flattened entry map can be accessed built up (by default) out of</p> --<div class="ulist"> --<ul> --<li> --<p>all entries from the default section, without any changes.</p> --</li> --<li> --<p>all entries from named sections, where the key for each entry is prefix with the section name and a '::' separator.</p> --</li> --</ul> --</div> --</li> --<li> --<p>The configuration format used determines the mapping of configuration data read into this structure. The format --implementation can as well provide alternate implementations of how the data read should be mapped into the --combined properties map.</p> --</li> --</ul> --</div> --</div> --<div class="sect3"> --<h4 id="_configurationformat">ConfigurationFormat</h4> --<div class="paragraph"> --<p>A ConfigurationFormat is basically an abstraction that reads a configuration resource (modelled by an InputStream) and --creates a corresponding ConfigurationData instance.</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public interface ConfigurationFormat { -- -- String getName(); -- boolean accepts(URL url); -- ConfigurationData readConfiguration(String resource, InputStream inputStream); --}</code></pre> --</div> --</div> --</div> --</div> --<div class="sect2"> --<h3 id="_how_to_tranform_configurationdata_into_a_propertysource">How to tranform ConfigurationData into a PropertySource</h3> --<div class="paragraph"> --<p>For for the conversion of ConfigurationData into a PropertySource different approaches can be useful:</p> --</div> --<div class="olist arabic"> --<ol class="arabic"> --<li> --<p>The ConfigurationFormat that reads the data can provides all properties read either as sectioned properties --or/and as default properties. The most simple cases is, where all properties have been added as 'default' --properties. In this case the default properties can be used as the property sources properties without any change.</p> --</li> --<li> --<p>If the format did also add section based properties, the combined properties returned can be used, hereby --replacing the '::' separator with a '.' separator.</p> --</li> --<li> --<p>In all other cases a custom mapping is useful, which can be acomplished by using the MappedConfigurationDataPropertySource --and overriding the Map<String,String> populateData(ConfigurationData data) method.</p> --</li> --</ol> --</div> --<div class="paragraph"> --<p>In most cases the usage of a FlattenedDefaultPropertySource, is a good choice to start. This class --provides a convenient default mapping and also allows to customized the mapping easily:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">ConfigurationData data = ...; --FlattenedDefaultPropertySource ps = new FlattenedDefaultPropertySource(data){ -- protected Map<String, String> populateData(ConfigurationData data) { -- ... -- } --};</code></pre> --</div> --</div> --<div class="paragraph"> --<p>Nevertheless, depending on the context, where a configuration source was read (classloader, time, source etc.) the --resulting properties can have different semnatics, especially different priorities. Also section --names may be mapped into different ordinals instead of using them as key prefixes (e.g. imagine configuration formats --with a 'default', 'main', and 'overrides' sections). For such more complex or custom cases no simple mapping --can be defined. Consequently the functionality mapping the normalized ConfigurationData read to the --appropriate collection of PropertySource instances must be implemented.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_examples">Examples</h3> --<div class="sect3"> --<h4 id="_mapping_ini_files">Mapping ini-Files</h4> --<div class="paragraph"> --<p>Consider the following ini-file:</p> --</div> --<div class="listingblock"> --<div class="title">Example.ini</div> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-listing" data-lang="listing">a=valA --a.b=valB -- --[section1] --aa=sectionValA --aa.b.c=SectionValC -- --[section2] --a=val2Section2</code></pre> --</div> --</div> --<div class="paragraph"> --<p>This file content coud be mapped to the following structure:</p> --</div> --<div class="listingblock"> --<div class="title">Mapping of Example.ini</div> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-listing" data-lang="listing">a=valA --a.b=valB --section1::valA=sectionValA --section1::a.b.c=SectionValC --section2::a=val2Section2</code></pre> --</div> --</div> --<div class="paragraph"> --<p>Nevertheless from the ConfigurationData instance a more complex algorithm can access all the different parts:</p> --</div> --<div class="ulist"> --<ul> --<li> --<p>the_default_ properties (a, a.b)</p> --</li> --<li> --<p>the section section1, with properties aa, aa.b.c</p> --</li> --<li> --<p>the section section2, qith properties a</p> --</li> --</ul> --</div> --</div> --<div class="sect3"> --<h4 id="_mapping_xml_files">Mapping xml-Files</h4> --<div class="paragraph"> --<p>The same concept can also be applied to xml-files. Consider the following configuration file:</p> --</div> --<div class="listingblock"> --<div class="title">Example.conf</div> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><config> -- <default> -- <a>valA</a> -- <a.b>valB</a.B> -- </default> -- -- <section id="section1"> -- <param id="aa">sectionValA</aa> -- <param id="aa.b.c">SectionValC</aa.b.c> -- </section> -- <section id="section2"> -- <param id="a">val2Section2</aa> -- </section> --</config></code></pre> --</div> --</div> --<div class="paragraph"> --<p>This file basically describes the same configuration as the ini-based version we have seen before. The formats --module hereby ships with 3 format classes:</p> --</div> --<div class="ulist"> --<ul> --<li> --<p>PropertiesFormat providing support for .properties files.</p> --</li> --<li> --<p>PropertiesXmlFormat providing support for xml.property files.</p> --</li> --<li> --<p>IniConfiguratonFormat providing support for xml.property files.</p> --</li> --</ul> --</div> --</div> --</div> --</div> --</div></p> -- -- <hr /> -- </div> -- </div> -- <div> -- <div id="push"></div> -- -- <div id="footer"> -- <div class="container"> -- <p class="muted credit">© 2014-2016 Apache Software Foundation | Mixed with <a href="http://getbootstrap.com/";>Bootstrap v3.1.1</a> -- | Baked with <a href="http://jbake.org";>JBake <span>v2.5.0</span></a> -- at <span>2016-12-19</span> -- </p> -- <p> -- <b>Disclaimer</b> -- Apache Tamaya (incubating) is an effort undergoing -- incubation at -- The Apache Software Foundation (ASF), sponsored by -- the name of Apache Incubator. 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<p><em>2016-12-18</em></p> - <p><em>2016-12-19</em></p> -- -- <p><div id="preamble"> --<div class="sectionbody"> --<!-- toc disabled --> --</div> --</div> --<div class="sect1"> --<h2 id="Core">Tamaya Functions (Extension Module)</h2> --<div class="sectionbody"> --<div class="sect2"> --<h3 id="_overview">Overview</h3> --<div class="paragraph"> --<p>Tamaya Functions is an extension module. Refer to the <a href="modules.html">extensions documentation</a> for further details.</p> --</div> --<div class="paragraph"> --<p>Tamaya Functions provides several functional extensions using the ConfigOperator,ConfigQuery extension points. Most --functional extension are accessible from the ConfigurationFunction singleton. When importing its methods statically --one can use the methods to achieve some interesting effects, e.g.</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">import static org.apache.tamaya.functions.ConfigurationFunctions.*; -- --Set<String> sections = ConfigurationProvider.getConfiguration().with(areas("a", false).with(transitiveAreas());</code></pre> --</div> --</div> --<div class="paragraph"> --<p>The expression above returns all fully qualified section names that are child sections of the root section 'a'. --So given the entries a.b.entry1, a.b.entry2, a.a.entry3, a.b.c.entry4 the reult would be a, a.a, a.b, a.b.c.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_compatibility">Compatibility</h3> --<div class="paragraph"> --<p>The module is based on Java 7, so it can be used with Java 7 and beyond.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_installation">Installation</h3> --<div class="paragraph"> --<p>For using the functionality shown in this document you only must add the corresponding dependency to your module:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> -- <groupId>org.apache.tamaya.ext</groupId> -- <artifactId>tamaya-functions</artifactId> -- <version>{tamaya_version}</version> --</dependency></code></pre> --</div> --</div> --</div> --<div class="sect2"> --<h3 id="_the_provided_functions">The Provided Functions</h3> --<div class="sect3"> --<h4 id="_functions_on_configurationfunctions">Functions on ConfigurationFunctions</h4> --<div class="paragraph"> --<p>The following sections explain the provided functions defined by ConfigurationFunctions singleton.</p> --</div> --<div class="ulist"> --<ul> --<li> --<p><strong>ConfigOperator filter(PropertyMatcher matcher)</strong> creates a ConfigOperator that creates a Configuration --containing only keys that are selected by the given <em>matcher predicate</em>. The PropertyMatcher hereby allows to evaluate not only --the <em>key</em>, but also the <em>value</em>.</p> --</li> --<li> --<p><strong>ConfigOperator map(KeyMapper keyMapper)</strong> creates a ConfigOperator that maps the keys as defined --by the given <em>keyMapper</em>.</p> --</li> --<li> --<p><strong>ConfigOperator section(String section)</strong> creates a ConfigOperator that creates a Configuration containing only --entries that are direct or indirect members of the given section.</p> --</li> --<li> --<p><strong>ConfigOperator section(String areaKey, boolean stripKeys)</strong> creates a ConfigOperator that creates a Configuration --containing only entries that are direct or indirect members of the given section. Hereby <em>stripKeys</em> allows to determine --if the returned entries should be relative to the search criteria {{stripKeys=true}} or absolute keys.</p> --</li> --<li> --<p><strong>isKeyInSection(String section, String sectionKey)</strong> allows to easily determine if a given <em>key</em> is a direct or indirect member --of a given section.</p> --</li> --<li> --<p><strong>boolean isKeyInSections(String key, String…​ sectionKeys)</strong> allows to easily determine if one key of given --<em>key</em> is a direct or indirect member of at least one of the given <em>sectionKeys</em>.</p> --</li> --<li> --<p><strong>ConfigQuery<Set<String>> sections()</strong> allows to query all the contained fully qualified section names (the ones that --also have parameters present).</p> --</li> --<li> --<p><strong>ConfigQuery<Set<String>> transitiveSections()</strong> allows to query all the contained fully qualified section names, --including the transitive closure of sections.</p> --</li> --<li> --<p><strong>ConfigQuery<Set<String>> sections(final Predicate<String> predicate)</strong> allows to query all the contained fully --qualified section names that are selected by the given <em>predicate</em>.</p> --</li> --<li> --<p><strong>ConfigQuery<Set<String>> sections(final Predicate<String> predicate)</strong> allows to query all the contained fully --qualified section names that are selected by the given <em>predicate</em>, including the transitive closure of sections --identified.</p> --</li> --<li> --<p><strong>ConfigOperator sectionsRecursive(String…​ sectionKeys)</strong> provides a ConfigOperator that filters all sections identified --by the given <em>sectionKeys</em> and its child sections.</p> --</li> --<li> --<p><strong>ConfigOperator sectionRecursive(final boolean stripKeys, final String…​ sectionKeys)</strong> provides a ConfigOperator --that filters all sections identified by the given <em>sectionKeys</em> and its child sections. <em>stripKeys</em> allows to --determine if the resulting configuration should be relative to the selected areas ({{stripKeys=true}}) or --absolute (filtering only).</p> --</li> --<li> --<p><strong>ConfigQuery<String> jsonInfo()</strong> returns a query that converts a Configuration into a JSON formatted String --representation.</p> --</li> --</ul> --</div> --</div> --<div class="sect3"> --<h4 id="_functions_on_propertysourcefunctions">Functions on PropertySourceFunctions</h4> --<div class="paragraph"> --<p>The following sections explain the provided functions defined by PropertySourceFunctions singleton.</p> --</div> --<div class="ulist"> --<ul> --<li> --<p><strong>PropertySource addMetaData(PropertySource propertySource, Map<String,String> metaData)</strong> Creates a new PropertySource --with the given metadata added.</p> --</li> --<li> --<p><strong>boolean isKeyInSection(String key, String sectionKey)</strong> Checks if the given <em>key</em> is a direct or indirect member of --one of the given <em>sectionKey</em>.</p> --</li> --<li> --<p><strong>boolean isKeyInSections(String key, String…​ sectionKeys)</strong> Checks if the given <em>key</em> is a direct or indirect member of --one of one of the given <em>sectionKeys</em>.</p> --</li> --<li> --<p><strong>Set<String> sections(Map<String, String> properties)</strong> Extracts the sections from the given properties.</p> --</li> --<li> --<p><strong>Set<String> transitiveSections(Map<String, String> properties)</strong> Extracts the transitive sections from the given --properties.</p> --</li> --<li> --<p><strong>Set<String> sections(Map<String, String> properties, final Predicate<String> predicate)</strong> Extracts the sections --from the given properties, also filtering with the given predicate.</p> --</li> --<li> --<p><strong>Set<String> transitiveSections(Map<String, String> properties, Predicate<String> predicate)</strong> Extracts the transitive --sections from the given properties, also filtering with the given predicate.</p> --</li> --<li> --<p><strong>Map<String,String> sectionsRecursive(Map<String, String> properties, String…​ sectionKeys)</strong> Creates w PropertySource --only containing the sections that a direct or indirect children of the given <em>sectionKeys</em>.</p> --</li> --<li> --<p><strong>Map<String,String> sectionRecursive(Map<String, String> properties, boolean stripKeys, String…​ sectionKeys)</strong> Creates w PropertySource --only containing the sections that a direct or indirect children of the given <em>sectionKeys</em>. With <em>stripKeys</em> one can --select of the returned values should be relative to its selection of be fully qualified.</p> --</li> --<li> --<p><strong>String stripSectionKeys(String key, String…​ sectionKeys)</strong> This function strips away the matching section key as given --in <em>sectionKeys</em> from a given <em>key</em>.</p> --</li> --</ul> --</div> --</div> --</div> --</div> --</div></p> -- -- <hr /> -- </div> -- </div> -- <div> -- <div id="push"></div> -- -- <div id="footer"> -- <div class="container"> -- <p class="muted credit">© 2014-2016 Apache Software Foundation | Mixed with <a href="http://getbootstrap.com/";>Bootstrap v3.1.1</a> -- | Baked with <a href="http://jbake.org";>JBake <span>v2.5.0</span></a> -- at <span>2016-12-19</span> -- </p> -- <p> -- <b>Disclaimer</b> -- Apache Tamaya (incubating) is an effort undergoing -- incubation at -- The Apache Software Foundation (ASF), sponsored by -- the name of Apache Incubator. 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<p><em>2016-12-18</em></p> - <p><em>2016-12-19</em></p> -- -- <p><div id="preamble"> --<div class="sectionbody"> --<!-- toc disabled --> --</div> --</div> --<div class="sect1"> --<h2 id="Core">Tamaya Injection (Extension Module)</h2> --<div class="sectionbody"> --<div class="sect2"> --<h3 id="_overview">Overview</h3> --<div class="paragraph"> --<p>Tamaya Injection is an extension module. Refer to the <a href="modules.html">extensions documentation</a> for further details --about modules.</p> --</div> --<div class="paragraph"> --<p>Tamaya Injection provides functionality for injecting configured values into beans, or creating configuration --template instances.</p> --</div> --<div class="paragraph"> --<p>Inversion of Control (aka IoC/the Hollywood Principle) has proven to be very useful and effective in avoiding boilerplate --code. In Java there are different frameworks available that all provide IoC mechanisms. Unfortunately IoC is not a --built-in language feature. So for a portable solution that works also in Java SE Tamaya itself has to provide the --according injection services. This module adds this functionality to Tamaya.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_compatibility">Compatibility</h3> --<div class="paragraph"> --<p>The module is based on Java 7, so it can be used with Java 7 and beyond.</p> --</div> --</div> --<div class="sect2"> --<h3 id="_installation">Installation</h3> --<div class="paragraph"> --<p>Basically Tamaya’s injection API is deployed as API artifact:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> -- <groupId>org.apache.tamaya.ext</groupId> -- <artifactId>tamaya-injection-api</artifactId> -- <version>{tamaya_version}</version> --</dependency></code></pre> --</div> --</div> --<div class="paragraph"> --<p>To use injection with Java SE you must add the corresponding dependency to your module:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> -- <groupId>org.apache.tamaya.ext</groupId> -- <artifactId>tamaya-injection</artifactId> -- <version>{tamaya_version}</version> --</dependency></code></pre> --</div> --</div> --<div class="paragraph"> --<p>Similarly there are other injection implementations available, targetig platforms such as</p> --</div> --<div class="ulist"> --<ul> --<li> --<p>Spring, Spring Boot</p> --</li> --<li> --<p>Java EE/CDI</p> --</li> --<li> --<p>OSGI, Apache Felix/Apache Karaf</p> --</li> --</ul> --</div> --</div> --<div class="sect2"> --<h3 id="_core_concepts">Core Concepts</h3> --<div class="paragraph"> --<p>Basically you annotate fields or methods in your beans with @Config to enable configuration injection. Tamaya --additionally defines further annotations that allo you to define additional aspects such as default values, custom --converters etc. The following example illustrates the basic functionality: --code snippet:</p> --</div> --<div class="listingblock"> --<div class="title">Annotated Example Class</div> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">package foo.bar; -- --public class ConfiguredClass { -- -- // resolved by default, using property name, class and package name: foo.bar.ConfiguredClass.testProperty -- private String testProperty; -- -- // Trying to resolve mutiple keys, with a default value, if none could be resolved -- @Config({"a.b.c.key1","a.b.legacyKey",area1.key2"}, defaultValue="The current \\${JAVA_HOME} env property is ${env:JAVA_HOME}.") -- String value1; -- -- // Typical case -- @Config("a.b.c.key2") -- private int value2; -- -- // resolved by default as foo.bar.ConfiguredClass.accessUrl -- // Using a (default) String -> URL converter -- @Config(defaultValue="http://127.0.0.1:8080/res/api/v1/info.json";) -- private URL accessUrl; -- -- // Config injection disabled for this property -- @NoConfig -- private Integer int1; -- -- // Overriding the String -> BigDecimal converter with a custom implementation. -- @Config("BD") -- @WithPropertyConverter(MyBigDecimalRoundingAdapter.class) -- private BigDecimal bigNumber; -- -- ... --}</code></pre> --</div> --</div> --<div class="paragraph"> --<p>When configuring data or configuration classes it is also possible to auto-inject the fields identified. For activating --this feature a class must be annotated with @ConfigAutoInject:</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre class="prettyprint highlight"><code class="language-java" data-lang="java">. An autoinjected bean class ---------------------------------------------- --package a.b;</code></pre> --</div> --</div> --<div class="paragraph"> --<p>@ConfigAutoInject --public final class Tenant { -- private int id; -- private String name; -- private String description; -- @NoConfig // prevents auto injection for this field -- private String id2;</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre> public int getId(){ -- return id; -- } -- public String getName(){ -- return name; -- } -- public String getDescription(){ -- return description; -- } --}</pre> --</div> --</div> --<div class="listingblock"> --<div class="content"> --<pre>These examples do not show all possibilities provided. Configuring instance of these --class using Tamaya is very simple: Just pass the instance to Tamaya to let --Tamaya inject the configuration (or throw a +ConfigException+, if this is not possible): -- --[source,java] --.Configuring the +ConfiguredClass+ Instance</pre> --</div> --</div> --<div class="paragraph"> --<p>ConfiguredClass classInstance = new ConfiguredClass(); --ConfigurationInjector.configure(configuredClass);</p> --</div> --<div class="paragraph"> --<p>Tenant tenant = new Tenant(); --ConfigurationInjector.configure(tenant);</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>NOTE: Configuration injection works similarly, when used with other integration modules, e.g. when Tamaya is used --with CDI, Spring or within an OSGI container. For further details refer also to the corresponding integration module's --documentation. -- -- --=== The Annotations in detail --==== The ConfigurationInjector -- --The +ConfigurationInjector+ interface provides methods that allow any kind of instances to be configured --by passing the instances to +T ConfigurationInjector.getInstance().configure(T);+. The classes passed --hereby must not be annotated with +@Config+ for being configurable. By default Tamaya --tries to determine configuration for each property of an instance passed, using the following resolution policy: -- --Given a class +a.b.MyClass+ and a field +myField+ it would try to look up the following keys: --[source, listing]</pre> --</div> --</div> --<div class="paragraph"> --<p>a.b.MyClass.myField --a.b.MyClass.my-field --MyClass.myField --MyClass.my-field --myField --my-field</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>So given the following properties: -- --[source, properties]</pre> --</div> --</div> --<div class="paragraph"> --<p>a.b.Tenant.id=1234 --Tenant.description=Any kind of tenant. --name=<unnamed></p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>==== Accessing Supplier instances -- --In many cases you want to create a supplier that simply creates instances that are correctly configured as defined --by the current context. This can be done using +Suppliers+: -- --[source, java]</pre> --</div> --</div> --<div class="paragraph"> --<p>Supplier<Tenant> configuredTenantSupplier = ConfigurationInjector.getInstance().getConfiguredSupplier( -- new Supplier<Tenant>(){ -- public Tenant get(){ -- return new Tenant(); -- } --});</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>With Java 8 it's even more simple: -- --[source, java]</pre> --</div> --</div> --<div class="paragraph"> --<p>Supplier<Tenant> configuredTenantSupplier = ConfigurationInjector.getInstance().getConfiguredSupplier( -- Tenant::new);</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>Hereby this annotation can be used in multiple ways and combined with other annotations such as --+@WithLoadPolicy+, +@WithConfigOperator+, +@WithPropertyConverter+. -- --==== Minimal Example -- --To illustrate the mechanism below the most simple variant of a configured class is given: -- --[source,java] --.Most simple configured class</pre> --</div> --</div> --<div class="paragraph"> --<p>pubic class ConfiguredItem{ -- @Config -- private String aValue; --}</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>When this class is configured, e.g. by passing it to +ConfigurationInjector.getInstance().configure(Object)+, --the following is happening: -- --* The current valid +Configuration+ is evaluated by calling +Configuration cfg = ConfigurationProvider.getConfiguration();+ --* The current property value (String) is evaluated by calling +cfg.get("aValue");+ for each possible key (mutliple -- keys are possible). --* if not successful, an error is thrown (+ConfigException+) --* On success, since no type conversion is involved, the value is injected. -- --==== Using @DefaultValue -- --In the next example we explicitly define the property value: --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>pubic class ConfiguredItem{</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre> @Config(value={"aValue", "a.b.value","a.b.deprecated.value"}, defaultValue="${env:java.version}") -- private String aValue; --}</pre> --</div> --</div> --<div class="listingblock"> --<div class="content"> --<pre>==== Inject a DynamicValue Property -- --Within this example we evaluate a dynamic value. This mechanism allows you to listen for configuration changes and to --commit new values exactly, when convenient for you. -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>pubic class ConfiguredItem{</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre> @Config(value={"aValue", "a.b.value","a.b.deprecated.value"}, defaultValue="${env:java.version}") -- private DynamicValue aValue; --}</pre> --</div> --</div> --<div class="listingblock"> --<div class="content"> --<pre>The +DynamicValue+ provides you the following functionality: -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>public interface DynamicValue<T> {</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre>enum UpdatePolicy{ -- IMMEDIATE, -- EXPLCIT, -- NEVER, -- LOG_AND_DISCARD --}</pre> --</div> --</div> --<div class="literalblock"> --<div class="content"> --<pre>T get(); --T getNewValue(); --T evaluateValue(); --T commitAndGet(); --void commit(); --void discard(); --boolean updateValue();</pre> --</div> --</div> --<div class="literalblock"> --<div class="content"> --<pre>void setUpdatePolicy(UpdatePolicy updatePolicy); --UpdatePolicy getUpdatePolicy(); --void addListener(PropertyChangeListener l); --void removeListener(PropertyChangeListener l);</pre> --</div> --</div> --<div class="literalblock"> --<div class="content"> --<pre>boolean isPresent(); --T orElse(T other); --// Enabled with Java 8 --// T orElseGet(ConfiguredItemSupplier<? extends T> other); --// <X extends Throwable> T orElseThrow(ConfiguredItemSupplier<? extends X> exceptionSupplier) throws X;</pre> --</div> --</div> --<div class="paragraph"> --<p>}</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>Summarizing this class looks somehow similar to the new +Optional+ class added with Java 8. It provides --a wrapper class around a configured instance. Additionally this class provides functionality that gives --active control, to manage a configured value based on a ++LoadingPolicy+: -- --* +IMMEDEATE+ means that when the configuration system detects a change on the underlying value, the new value -- is automatically applied without any further notice. --* +EXPLICIT+ means that a new configuration value is signalled by setting the +newValue+ property. if +getNewValue()+ -- returns a non null value, the new value can be applied by calling +commit()+. You can always access the newest value, -- hereby implicitly applying it, by accessing it via +commitAndGet()+. Also it is possible ti ignore a change by calling -- +discard()+. --* +NEVER+ means the configured value is evaluated once and never updated. All changes are silently discarded. --* +LOG_AND_DISCARD+ similar to +NEVER+, but changes are logged before they are discarded. -- --Summarizing a +DynamicValue+ allows you -- --* to reload actively updates of configured values. --* update implicitly or explicitly all changes on the value. --* add listeners that observe changes of a certain value. -- --Dynamic values also allow on-the-fly reevaluation of the value by calling +evaluateValue()+. Hereby the value of the --instance is not changed. -- -- --==== Ommitting Injection using @NoConfig -- --Adding the @NoConfig annotation prevents a field or method to be auto-injected from --configuration. This is especially useful, if a type is annotated as @ConfigAutoInject with auto-confiuration --turned on as follows: -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>@ConfigAutoInject --pubic class ConfiguredItem{</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre>@NoConfig --private transient int sum;</pre> --</div> --</div> --<div class="literalblock"> --<div class="content"> --<pre> private String a; -- private String b; -- Private String c; --}</pre> --</div> --</div> --<div class="listingblock"> --<div class="content"> --<pre>In this case the fields +a,b,c+ are configured, whereas the field +sum+ is ignored regarding --configuration. -- --==== Adding custom operators using @WithConfigOperator -- --The @WithConfigOperator annotation allows you define a class of type +ConfigOperator+, to being applied --to the final +Configuration+, BEFORE the value is injected. This can be used for various use cases, e.g. --filtering or validating the visible properties for a certain use case. -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>@WithConfigOperator(MyConfigView.class) --pubic class ConfiguredItem{</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre>@Config --private String a;</pre> --</div> --</div> --<div class="paragraph"> --<p>}</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>==== Adding custom property converters using @WithPropertyConverter -- --The @WithPropertyConverter annotation allows you to define a class of type +PropertyConverter+, to be applied --on a property configured to convert the String value to the expected injected type. This can be used for --various use cases, e.g. adding custom formats, config models, decryption. -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>pubic class ConfiguredItem{</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre>@WithPropertyConverter(MyPropertyConverter.class) --@Config --private String a;</pre> --</div> --</div> --<div class="paragraph"> --<p>}</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>==== Defining the loading policy to be applied to configured values using @WithLoadPolicy -- --The @WithLoadPolicy annotation allows to define the loading behaviour to be applied. The +LoadPolicy+ --enum hereby defines the various loading modes. -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>@WithLoadPolicy(LoadPolicy.NEVER) --pubic class BootTimeStableConfig{</p> --</div> --<div class="literalblock"> --<div class="content"> --<pre>@WithPropertyConverter(MyPropertyConverter.class) --@Config --private String a;</pre> --</div> --</div> --<div class="paragraph"> --<p>}</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre>=== Configuration Events -- --Similar to CDI Tamaya publishes Configuration events, when instances were configured. It depends on the effective --event backend in use, if and how events are published: -- --* when you have the CDI extension active events are published using the default CDI event mechanism. --* in all other scenarios events are delegated to the +tamaya-events+ module, if available, --* if no event delegation is available no events are published. -- --The event published is very simple: -- --[source,java]</pre> --</div> --</div> --<div class="paragraph"> --<p>public interface ConfiguredType { -- Class getType(); -- String getName(); -- Collection<ConfiguredField> getConfiguredFields(); -- Collection<ConfiguredMethod> getConfiguredMethods(); -- void configure(Object instance, Configuration config); --}</p> --</div> --<div class="paragraph"> --<p>public interface ConfiguredField { -- Class<?> getType(); -- Collection<String> getConfiguredKeys(); -- String getName(); -- String getSignature(); -- Field getAnnotatedField(); -- void configure(Object instance, Configuration config); --}</p> --</div> --<div class="paragraph"> --<p>public interface ConfiguredMethod { -- Collection<String> getConfiguredKeys(); -- Class<?>[] getParameterTypes(); -- Method getAnnotatedMethod(); -- String getName(); -- String getSignature(); -- void configure(Object instance, Configuration config); --}</p> --</div> --<div class="listingblock"> --<div class="content"> --<pre></pre> --</div> --</div> --</div> --</div> --</div></p> -- -- <hr /> -- </div> -- </div> -- <div> -- <div id="push"></div> -- -- <div id="footer"> -- <div class="container"> -- <p class="muted credit">© 2014-2016 Apache Software Foundation | Mixed with <a href="http://getbootstrap.com/";>Bootstrap v3.1.1</a> -- | Baked with <a href="http://jbake.org";>JBake <span>v2.5.0</span></a> -- at <span>2016-12-19</span> -- </p> -- <p> -- <b>Disclaimer</b> -- Apache Tamaya (incubating) is an effort undergoing -- incubation at -- The Apache Software Foundation (ASF), sponsored by -- the name of Apache Incubator. Incubation is required of -- all newly accepted projects until a further review indicates -- that the infrastructure, communications, and decision making -- process have stabilized in a manner consistent with other -- successful ASF projects. While incubation status is not -- necessarily a reflection of the completeness or stability of -- the code, it does indicate that the project has yet to -- be fully endorsed by the ASF.<br /> -- <a href="http://incubator.apache.org/guides/website.html"; style="border:0px;" target="_target"><img class="incubator-logo" src="../../logos/egg-logo2.png"/></a> -- </p> -- </div> -- </div> -- -- <!-- Le javascript -- ================================================== --> -- <!-- Placed at the end of the document so the pages load faster --> -- <script src="../../js/jquery-1.11.1.min.js"></script> -- <script src="../../js/bootstrap.min.js"></script> -- <script src="../../js/prettify.js"></script> -- -- </div> -- </body> --</html>
