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class="page-header"> + <h1>Apache Tamaya&#8201;&#8212;&#8201;Extension: Classloader Isolation Support</h1> + </div> + + <p><em>2016-12-18</em></p> + + <p><div id="preamble"> +<div class="sectionbody"> +<!-- toc disabled --> +</div> +</div> +<div class="sect1"> +<h2 id="Remote">Tamaya CDI Integration (Extension Modules)</h2> +<div class="sectionbody"> +<div class="sect2"> +<h3 id="_overview">Overview</h3> +<div class="paragraph"> +<p>Apache Tamaya currently provides two implementations for integration with CDI extensions implementing similar +functionality as described in this document:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>Loading of CDI managed SPI components as configuration extensions such as PropertySources, PropertySourceProviders, +PropertyFilters, etc. This also includes SPI defined by any Tamaya submodules.</p> +</li> +<li> +<p>Implement and enable Tamaya’s configuration injection services with CDI.</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>Hereby there are two implementations provided:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>tamaya-cdi-ee implements injection by using CDI’s injection mechanism to inject configuration values into the +beans managed by the CDI systems.</p> +</li> +<li> +<p>tamaya-cdi-se implements injection by integrating the tamaya-injection SE based injection module (also used +for Spring and OSGI injection) with CDI. Injection hereby is performed by the Tamaya SE module, whereas +beans and injection control overall are still managed by CDI.</p> +</li> +<li> +<p>One difference, of course, is that tamaya-se also provides an SE compatible API (ConfigurationInjection, +ConfigurationInjector), which is not available, when using the purely Java EE based variant.</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>The annotations used for all injection functionality in Tamaya is defined as a separate module. This allows you to +code against the injection API without dependency on the concrete injection implementation. As a consequence your +components will be compatible regardless if deployed in a pure SE, a Java EE (CDI) or OSGI or Spring environment:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre><dependency> + <groupId>org.apache.tamaya.ext</groupId> + <artifactId>tamaya-injection-api</artifactId> + <version>{tamaya_version}</version> +</dependency></pre> +</div> +</div> +</div> +<div class="sect2"> +<h3 id="_compatibility">Compatibility</h3> +<div class="paragraph"> +<p>Both modules are based on Java 7, so they 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 Tamaya CDI integration you only must one of the following dependencies to your module. Ensure that +you never have installed both CDI extensions at the same time because this may be lead to unforseen side-effects.</p> +</div> +<div class="listingblock"> +<div class="title">CDI Pure Application Configuration</div> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> + <groupId>org.apache.tamaya.ext</groupId> + <artifactId>tamaya-cdi-ee</artifactId> + <version>{tamaya_version}</version> +</dependency></code></pre> +</div> +</div> +<div class="listingblock"> +<div class="title">CDI enhanced with Tamaya SE Application Configuration</div> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml"><dependency> + <groupId>org.apache.tamaya.ext</groupId> + <artifactId>tamaya-cdi-se</artifactId> + <version>{tamaya_version}</version> +</dependency></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Both components will auto-register its components and override the default ServicceContext in use. Additionally they +register CDI extensions that implement Configuration injection as described before.</p> +</div> +<div class="admonitionblock important"> +<table> +<tr> +<td class="icon"> +<div class="title">Important</div> +</td> +<td class="content"> +Never install Tamaya’s tamaya-cdi-se and tamaya-cdi-ee on the same system, since unpredictable side + effects could occur. +</td> +</tr> +</table> +</div> +</div> +<div class="sect2"> +<h3 id="_registering_cdi_managed_components_into_the_application_s_configurationcontext">Registering CDI managed components into the Application’s ConfigurationContext</h3> +<div class="paragraph"> +<p>As mentioned both modules allow to provide Tamaya SPI extensions modules as ordinary CDI managed beans. By default +extensions should be registered using @Singleton or @ApplicationScoped scope annotations. So you can define/deploy +additional application specific PropertySources and other artifacts simply by defining a CDI managed bean implementing +the required SPI interface:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@Singleton +public class TestPropertySource implements PropertySource{ + + final Map<String,String> config = new HashMap<>(); + + public TestPropertySource(){ + config.put("a.b.c.key1", "keys current a.b.c.key1"); + config.put("a.b.c.key2", "keys current a.b.c.key2"); + config.put("{"+getName()+"}source", getClass().getName()); + } + + @Override + public int getOrdinal() { + return 10; + } + + @Override + public String getName() { + return getClass().getName(); + } + + @Override + public String get(String key) { + return config.get(key); + } + + @Override + public Map<String, String> getProperties() { + return config; + } + + @Override + public boolean isScannable() { + return true; + } +}</code></pre> +</div> +</div> +<div class="paragraph"> +<p>Note that for many SPI’s there is a priority mechanism using @Priority annotations in place. +The ServiceContext implementation combines the components registered with the ones loaded from the ServiceLoader +mechanism hereby considering classloaser hierarchies.</p> +</div> +</div> +<div class="sect2"> +<h3 id="_annotating_your_classes">Annotating your Classes</h3> +<div class="paragraph"> +<p>Basically annotating your classes is stright forward. @Config defines an additional CDI qualifier that is, depending +on the module deployed, handled by a CDI producer (tamaya-cdi-ee) or the Tamaya SE injection mechanism $ +(tamaya-cdi-se). All types injected by this module are injected using <em>dependent scope</em>.</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@RequestScoped +public class ConfiguredClass{ + + @Config + private String testProperty; + + @Config({"a.b.c.key1","a.b.c.key2","a.b.c.key3"}) + @ConfigDefault("The current \\${JAVA_HOME} env property is ${env:JAVA_HOME}.") + String value1; + + @Config({"foo","a.b.c.key2"}) + private String value2; + + @Config + @ConfigDefault("N/A") + private String runtimeVersion; + + @Config + @ConfigDefault("${sys:java.version}") + private String javaVersion2; + + @Config + @ConfigDefault("5") + private Integer int1; + + ... + +}</code></pre> +</div> +</div> +</div> +<div class="sect2"> +<h3 id="_advanced_use_cases">Advanced Use Cases</h3> +<div class="paragraph"> +<p>Beside basic configuration Tamaya also covers additional requirements:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>_Reading multiple keys, where the first successful one is determining the value of the configuration, is +simply possible, by adding multiple keys to the @Configy annotation. +E.g. for trying first a.b and then new.b you would configure it as follows:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@Config({"a.b", "new.b"} +private String value;</code></pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p>When you must apply a ConfigOperator to your config, before reading the configuration, you can +configure one as follows:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@Config({"a.b", "new.b"} +@WithConfigOperator(MyOperator.class) +private String value;</code></pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p>When you must apply a some special conversion, or you use a type that is not registered +for conversion, you can configure a custom converter to be applied as follows:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@Config({"a.b", "new.b"} +@WithPropertyConverter(MyConverter.class) +private MySpecialFooType value;</code></pre> +</div> +</div> +<div class="ulist"> +<ul> +<li> +<p>Often multiple keys in a class belong to the same root section. So instead of copying this to +every entry you can define the most common root sections in the type’s header:</p> +</li> +</ul> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">@ConfigDefaultSections({"aaaa", "new"}); +public class MyType{ + +@Config({"b", "[legacy.bKey]"} // lookups: "aaaa.b", "new.b", legacy.bKey +private String value;</code></pre> +</div> +</div> +<div class="paragraph"> +<p>In the example above legacy.bKey defines an absolute key, which is not combined with any defined +default section parts.</p> +</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>2016-12-18</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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class="container"> + + <div class="page-header"> + <h1>Apache Tamaya&#8201;&#8212;&#8201;Extension: Classloader Isolation Support</h1> + </div> + + <p><em>2016-12-18</em></p> + + <p><div id="preamble"> +<div class="sectionbody"> +<!-- toc disabled --> +</div> +</div> +<div class="sect1"> +<h2 id="Remote">Tamaya Classloader Aware ServiceContext (Extension Module)</h2> +<div class="sectionbody"> +<div class="sect2"> +<h3 id="_overview">Overview</h3> +<div class="paragraph"> +<p>The Tamaya classloader support provides an alternative implementation of java.util.ServiceLoader, which is aware +of classloaders, hereby preventing multiple loading of components within a classloader hierarchy.</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 server 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-classloader-support</artifactId> + <version>{tamaya_version}</version> +</dependency></code></pre> +</div> +</div> +<div class="paragraph"> +<p>The component will auto.register its components and override the default ServicceContext in use by default +with an instance of type org.apache.tamaya.clsupport.internal.CLAwareServiceContext. This implementation returns +a priority of 10.</p> +</div> +</div> +<div class="sect2"> +<h3 id="_how_it_works">How it works</h3> +<div class="paragraph"> +<p>Basically the component manages a Map of all classloaders encountered. When services are accessed, the component +will evaluate the services as follows:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>the component walks up the class loader hierarchy.</p> +</li> +<li> +<p>in a next step the hierarchy is traversed down from the parent to the current classloader. Hereby it is checked +if the service list for the required type has been loaded already. If not the service configuration files are +evaluated.</p> +</li> +<li> +<p>This configuration file evaluation will ignore all resources already loaded by any of the already traversed parent +classloaders.</p> +</li> +<li> +<p>For each configuration file newly visible to the classloader currently traversed, the corresponding services are +loaded unleyy, the same service class already has been loaded by one its parent classloaders or another file +loaded with this classloader.</p> +</li> +<li> +<p>Finally all services found are returned as the full collection of services valid for the given context (classloader).</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>This ensures no service is loaded multiple times, even when it is referenced multiple times in several service +configurations. Additionally every service is loaded on the classloader where it is also declared the first time.</p> +</div> +</div> +<div class="sect2"> +<h3 id="_control_logging">Control Logging</h3> +<div class="paragraph"> +<p>The service component by default only logs errors. But it is possible to change this by reconfiguring the logging +levels on the following logging names/path: org.apache.tamaya.clsupport.internal.CLAwareServiceContext</p> +</div> +<div class="ulist"> +<ul> +<li> +<p><em>INFO</em> logs additional info on the services accessed.</p> +</li> +<li> +<p><em>FINEST</em> logs additional info on the services scanned and selected.</p> +</li> +</ul> +</div> +</div> +<div class="sect2"> +<h3 id="_classloader_aware_configuration">Classloader Aware Configuration</h3> +<div class="paragraph"> +<p>The mechanism above is used to provide a classloader aware implementation of ConfigurationContext +(org.apache.tamaya.clsupport.internal.CLAwareConfigurationContext). Similarly to the service variants +this class provides a context implementation that manages the core configuration aspects considering classloading +hierarchies:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>PropertySource, PropertySourceProviders</p> +</li> +<li> +<p>PropertyFilters, PropertyCombinationPolicy</p> +</li> +</ul> +</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>2016-12-18</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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disabled --> +</div> +</div> +<div class="sect1"> +<h2 id="Optional">Tamaya Collection Support (Extension Module)</h2> +<div class="sectionbody"> +<div class="sect2"> +<h3 id="_overview">Overview</h3> +<div class="paragraph"> +<p>All configuration in Tamaya is expressed as simple key, value pairs. Nevertheless this concept allows similarly +the modelling of collection typed values such as lists, sets, maps or simple collections of things. The Tamaya +Collections extension adds this functionality to the Tamaya eco-system.</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 use Tamaya collection 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-collections</artifactId> + <version>{tamaya_version}</version> +</dependency></code></pre> +</div> +</div> +</div> +<div class="sect2"> +<h3 id="_overview_2">Overview</h3> +<div class="paragraph"> +<p>Tamaya Collections adds PropertyConverter implementations that are able to access configuration data +as lists, maps or sets. By default this works out of the box as easy as accessing any other type of +configuration data, e.g.</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-java" data-lang="java">Configuration config = ConfigurationProvider.getConfiguration(); + +// Without any content specification, a list of String is returned. +List<String> simpleList = config.get("my.list.config.entry", List.class); + +// Using a TypeLiteral allows to use every convertible sub type supported by the system. +List<Integer> intList = config.get("my.list.config.entry", new TypeLiteral<List<Integer>>(){});</code></pre> +</div> +</div> +<div class="paragraph"> +<p>Configuration in that case, by default, is a simple comma-separated list of entries, e.g.</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties">my.list.config.entry=1,34454,23,344545,3445</code></pre> +</div> +</div> +<div class="paragraph"> +<p>Additionally the module allows adding additional meta-entries, which allows to tweak some of the +inner-workings, e.g.</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>using your own PropertyConverter implementation for parsing entries.</p> +</li> +<li> +<p>specifying a custom separator String to be used to split the items (default is {{','}}.</p> +</li> +<li> +<p>specifying a custom separator String to be used to split key/value paris when parsing map entries.</p> +</li> +<li> +<p>specifying the implementation type of the collection instance to be returned.</p> +</li> +<li> +<p>specifying if the resulting collection should be returned as a modifiable collection.</p> +</li> +</ul> +</div> +</div> +<div class="sect2"> +<h3 id="_supported_types">Supported Types</h3> +<div class="paragraph"> +<p>This module supports the following types:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>java.util.Collection</p> +</li> +<li> +<p>java.util.List</p> +</li> +<li> +<p>java.util.ArrayList</p> +</li> +<li> +<p>java.util.LinkedList</p> +</li> +<li> +<p>java.util.Set</p> +</li> +<li> +<p>java.util.SortedSet</p> +</li> +<li> +<p>java.util.TreeSet</p> +</li> +<li> +<p>java.util.HashSet</p> +</li> +<li> +<p>java.util.Map</p> +</li> +<li> +<p>java.util.SortedMap</p> +</li> +<li> +<p>java.util.HashMap</p> +</li> +<li> +<p>java.util.TreeMap</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>Hereby the type is determined primarly by the parameter type accessed, e.g. +config.get("mylist", ArrayList.class) will always return an ArrayList +as result.</p> +</div> +<div class="sect3"> +<h4 id="_configuring_the_target_implementation_type">Configuring the target implementation type</h4> +<div class="paragraph"> +<p>Tamaya Collections allows you to configure the target collection type by adding the +following meta-configuration entry (shown for the mylist entry). Hereby the package part java.util. +can be ommitted:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties">mylist=a,b,c +_mylist.collection-type=LinkedList</code></pre> +</div> +</div> +<div class="paragraph"> +<p>When calling config.get("mylist", ArrayList.class) this parameter does not have any effect, so you will still +get an ArrayList as a result. However when you call config.get("mylist", List.class) you will +get a LinkedList as implementation type.</p> +</div> +<div class="paragraph"> +<p>This mechanism similarly applies to all kind of collections, so you can use it similarly to define the implementation +type returned when accessing List, Map or Collection.</p> +</div> +</div> +</div> +<div class="sect2"> +<h3 id="_collecting_configuration_entries_instead_of_overriding">Collecting Configuration Entries instead of Overriding</h3> +<div class="paragraph"> +<p>By default Tamaya applies always an overriding CombinationPolicy, where only the configuration entry for +the most significant configuration entry is used. In case of collections (and maybe also other use cases), +overriding is not always the mechanism of choice. E.g. when you want to have all entries added to your +configuration to be <strong>combined</strong> to a new entry containing all values provided by any property sources.</p> +</div> +<div class="paragraph"> +<p>Therefore Tamaya Collections also provides a more sophistiated CombinationPolicy (automatically configured) +that allows to adapt the way how configuration entries are combined. All you must do is declaring +the mechanism to be applied by an according meta-configuration parameter, e.g. for my.list your config may +look as follows:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># from PropertSource 1 +my.list=1,2,3 + +# from PropertSource 2 +my.list=4,5,6 + +# without any additional meta-info these entries would be combined to +my.list=4,5,6</code></pre> +</div> +</div> +<div class="paragraph"> +<p>With Tamaya Collections you can now configure the combination policy as follows:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># use one of the default policies: override / collect +_my.list.combination-policy=collect + +# use an custom CombinationPolicy to combine the values +_my.list.combination-policy=com.mycomp.app.MyCombincationPolicy</code></pre> +</div> +</div> +<div class="paragraph"> +<p>So declaring the collect policy the resulting raw output of the entry looks as follows:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># result when applying the collect policy: +my.list=1,2,3,4,5,6</code></pre> +</div> +</div> +<div class="paragraph"> +<p>The customizable policy mechanism of Tamaya Collections also honors the item-separator meta-configuration +parameter explained later in this document.</p> +</div> +</div> +<div class="sect2"> +<h3 id="_format_of_collection_configuration">Format of Collection Configuration</h3> +<div class="paragraph"> +<p>By default collections are modelled as simple String values, that are tokenized into individual parts using a +defined item-separator (by default ','). So a given configuration entry of 1,2,3 is mapped to "1","2","3". +If the target context type is something different than String the smae conversion logic is used as when mapping +configuration parameters directly to non-String target types (implemented as +PropertyConverter classes, manahed +within the current ConfigurationContext. The procedure is identical for all collection types, including Map types, +with the difference that each token in the list is parsed once more for separating it into a key and a value. +The default separator for map entries hereby is "::". Map keys, as of now, are always of type String, whereas +for values the same logic is applied as for non-map collection types.</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># a list, using the default format +list=1,2,3,4,5,6 + +# a map, using the default format +map=a::b, c::d</code></pre> +</div> +</div> +<div class="sect3"> +<h4 id="_trimming_of_entries">Trimming of entries</h4> +<div class="paragraph"> +<p>By default all tokens parsed are trimmed <em>before</em> adding them to the final collection. In case of map entries this is +also the case for key/value entries. So the following configuration results in the identical values for +list1,list2 and map1,map2:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># a list, using the default format +list1=1,2,3,4,5,6 +list2=1, 2, 3, 4, 5, 6 + +# a map, using the default format +map1=a::b, c::d +map2=a :: b, c :: d</code></pre> +</div> +</div> +<div class="paragraph"> +<p>Nevertheless truncation can be controlled by the usage of brackets, e.g. the last list or map entry will have a single +space character as value:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># a list, with a ' ' value at the end +list3=1, 2, 3, 4, 5, [ ] + +# a map, with a ' ' value for key '0' +map3=1 :: a, 2 :: b, 0::[ ]</code></pre> +</div> +</div> +<div class="paragraph"> +<p>Hereby \[ escapes the sequence.</p> +</div> +</div> +<div class="sect3"> +<h4 id="_customizing_the_format">Customizing the format</h4> +<div class="paragraph"> +<p>The item and entry separators (by default ',' and "::") can be customized by setting corresponding meta-data +entries as follows, resulting in the same values as in the prevoius listing:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># a list, with a ' ' value at the end +list3=1__2__3__ 4__ 5__[ ] +_list3.item-separator=__ + +# a map, with a ' ' value for key '0' +map3=1->a, 2->b, 0->[ ] +_map3.map-entry-separator=-></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Of course these settings also can be combined:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="prettyprint highlight"><code class="language-properties" data-lang="properties"># a reformatted map +redefined-map=0==none | 1==single | 2==any +_redefined-map.map-entry-separator=== +_redefined-map.item-separator=|</code></pre> +</div> +</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>2016-12-18</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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id="Optional">Integration with consul (Extension Module)</h2> +<div class="sectionbody"> +<div class="sect2"> +<h3 id="_overview">Overview</h3> +<div class="paragraph"> +<p>The Tamaya consul integration module provides different artifacts which allows integration of Apachae Tamaya +configuration with consul. Basically the module supports read-only integration (as a ConsulPropertySource as well +as a support for MutableConfiguration as defined by the tamaya-mutable-config extension module.</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-consul</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>Consul integration comes basically with 2 artifacts:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>The org.apache.tamaya.etcd.ConsulPropertySource is a PropertySource with a default ordinal of 100 and the name +'consul', which is automatically registered.</p> +</li> +<li> +<p>If the tamaya-mutable-config module is loaded it is possible to write property values back into the consul cluster, +by accessing a MutableConfiguration using the URI config:consul.</p> +</li> +</ul> +</div> +</div> +<div class="sect2"> +<h3 id="_the_consulpropertysource">The ConsulPropertySource</h3> +<div class="paragraph"> +<p>The ConsulPropertySource is automatically registered and allows the consul servers to be used to be configured. This +enables to use e.g. in Docker environments the docker environment configuration mechanisms to configure Tamaya running +in microservice containers to connect with the according consul cluster:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>The property source reads the tamaya.consul.urls system and environment property to evaluate possible etcd servers +(comma separated), which can be connected to. On error the API just performs a Round-Robin through the list of +configured servers. Without any configuration http://127.0.0.1:2400 is used. If no connection to any consul +server can be established a warning will be logged, but deployment will not fail.</p> +</li> +<li> +<p>The ConsulPropertySource finally also allows the values read from the consul cluster to be mapped to prefixed +context. This can be activated by setting the -Dtamaya.consul.prefix=<PREFIX> system property. E.g. when the prefix is +set to cluster-config. a consul key of host:known/all is mapped to cluster-config.host:known/all.</p> +</li> +</ul> +</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>2016-12-18</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> http://git-wip-us.apache.org/repos/asf/incubator-tamaya-site/blob/4176b5bc/documentation/extensions/mod_environment.html ---------------------------------------------------------------------- diff --git a/documentation/extensions/mod_environment.html 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+<!-- toc disabled --> +</div> +</div> +<div class="sect1"> +<h2 id="Remote">Tamaya Environment Model (Extension Module)</h2> +<div class="sectionbody"> +<div class="sect2"> +<h3 id="_overview">Overview</h3> +<div class="paragraph"> +<p>The Tamaya Environment extension adds a simple PropertySourceProvider that evaluates a List of environment context and +combines them in the given order into an (optional) root context within the system’s configuration.</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 Tamaya Environment Model 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-envionment</artifactId> + <version>{tamaya_version}</version> +</dependency></code></pre> +</div> +</div> +</div> +<div class="sect2"> +<h3 id="_how_it_works">How it Works</h3> +<div class="paragraph"> +<p>tbd</p> +</div> +</div> +<div class="sect2"> +<h3 id="_reusable_base_classes">Reusable Base Classes</h3> +<div class="paragraph"> +<p>tbd</p> +</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>2016-12-18</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>
