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+ <h1>Apache Tamaya&#8201;&#8212;&#8201;Extension: Collection 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="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>2016-12-19</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>
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+
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http://git-wip-us.apache.org/repos/asf/incubator-tamaya-site/blob/4d01fe86/documentation/extensions/mod_consul.html
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+ <div class="container">
+
+ <div class="page-header">
+ <h1>Apache Tamaya&#8201;&#8212;&#8201;Extension: Integration with consul (Hashicorp)</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="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>2016-12-19</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>
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+ <script src="../../js/jquery-1.11.1.min.js"></script>
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+
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+ </body>
+</html>
http://git-wip-us.apache.org/repos/asf/incubator-tamaya-site/blob/4d01fe86/documentation/extensions/mod_environment.html
----------------------------------------------------------------------
diff --git a/documentation/extensions/mod_environment.html b/documentation/extensions/mod_environment.html
new file mode 100644
index 0000000..ce312f6
--- /dev/null
+++ b/documentation/extensions/mod_environment.html
@@ -0,0 +1,219 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+
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+ <meta charset="utf-8"/>
+ <title>Apache Tamaya&#8201;&#8212;&#8201;Extension: Classloader Isolation Support</title>
+ <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
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+ <div 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 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>2016-12-19</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>
+
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+ </body>
+</html>
http://git-wip-us.apache.org/repos/asf/incubator-tamaya-site/blob/4d01fe86/documentation/extensions/mod_etcd.html
----------------------------------------------------------------------
diff --git a/documentation/extensions/mod_etcd.html b/documentation/extensions/mod_etcd.html
new file mode 100644
index 0000000..619aae4
--- /dev/null
+++ b/documentation/extensions/mod_etcd.html
@@ -0,0 +1,385 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta charset="utf-8"/>
+ <title>Apache Tamaya&#8201;&#8212;&#8201;Extension: Integration with etcd (Core OS)</title>
+ <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+ <meta name="description" content=""/>
+ <meta name="author" content=""/>
+ <meta name="keywords" content=""/>
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+
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+ <h1>Apache Tamaya&#8201;&#8212;&#8201;Extension: Integration with etcd (Core OS)</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="Optional">Integration with etcd (Extension Module)</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="_overview">Overview</h3>
+<div class="paragraph">
+<p>The Tamaya etcd integration module provides different artifacts which allows integration of Apachae Tamaya
+configuration with etcd. Basically the module supports read-only integration (as a EtcdPropertySource 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-etcd</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>ETcd integration comes basically with 2 artifacts:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>The org.apache.tamaya.etcd.EtcdAccessor can be configured with a an url targeting an etcd server’s REST endpoint root.
+(org.apache.tamaya.etcd.EtcdAccessor). The accessor basically provides a simple Java API for communicating
+with etcd server. The accessor hereby allows reading of single properties, or whole subtrees. Also the basic non
+atomic write methods are implemented.</p>
+</li>
+<li>
+<p>The org.apache.tamaya.etcd.EtcdPropertySource is a PropertySource with a default ordinal of 100 and the name
+'etcd', 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 etcd cluster,
+by accessing a MutableConfiguration using the URI config:etcd.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_the_etcdaccessor">The EtcdAccessor</h3>
+<div class="paragraph">
+<p>The accessor mentioned implements the basic read and write API for communicating with an etcd configuration cluster.
+Hereby the accessor also provides etcd specific data such as createdIndex, modifiedIndex, ttl in the Map
+returned. Hereby the concept of etcd is used where keys starting with an '_' will be hidden from the overall
+properties map, being only directly/explicitly accessible:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public class EtcdAccessor {
+
+ /**
+ * Creates a new instance with the basic access url.
+ * @param server server url, e.g. {@code http://127.0.0.1:4001}.
+ * @throws MalformedURLException
+ */
+ public EtcdAccessor(String server) throws MalformedURLException;
+
+ /**
+ * Get the etcd server version.
+ * @return the etcd server version, never null.
+ */
+ public String getVersion();
+
+ /**
+ * Ask etcd for s aingle key, value pair. Hereby the response returned from etcd:
+ * <pre>
+ * key=value
+ * _key.source=[etcd]http://127.0.0.1:4001
+ * _key.createdIndex=12
+ * _key.modifiedIndex=34 // optional
+ * _key.ttl=300 // optional
+ * _key.expiration=... // optional
+ * </pre>
+ * @param key the requested key
+ * @return the mapped result, including meta-entries.
+ */
+ public Map<String,String> get(String key);
+
+ /**
+ * Creates/updates an entry in etcd without any ttl set.
+ * The response is as follows:
+ * <pre>
+ * key=value
+ * _key.source=[etcd]http://127.0.0.1:4001
+ * _key.createdIndex=12
+ * _key.modifiedIndex=34 // optional
+ * _key.prevNode.createdIndex=12 // optional
+ * _key.prevNode.modifiedIndex=34 // optional
+ * </pre>
+ * @param key the property key, not null
+ * @param value the value to be set
+ * @return the result map as described above.
+ */
+ public Map<String,String> set(String key, String value);
+
+ /**
+ * Creates/updates an entry in etcd. The response is as follows:
+ * <pre>
+ * key=value
+ * _key.source=[etcd]http://127.0.0.1:4001
+ * _key.createdIndex=12
+ * _key.modifiedIndex=34 // optional
+ * _key.ttl=300 // optional
+ * _key.expiry=... // optional
+ * _key.prevNode.createdIndex=12 // optional
+ * _key.prevNode.modifiedIndex=34 // optional
+ * _key.prevNode.ttl=300 // optional
+ * _key.prevNode.expiration=... // optional
+ * </pre>
+ * @param key the property key, not null
+ * @param value the value to be set
+ * @param ttlSeconds the ttl in seconds (optional)
+ * @return the result map as described above.
+ */
+ public Map<String,String> set(String key, String value, Integer ttlSeconds);
+
+
+ /**
+ * Deletes a given key. The response is as follows:
+ * <pre>
+ * _key.source=[etcd]http://127.0.0.1:4001
+ * _key.createdIndex=12
+ * _key.modifiedIndex=34
+ * _key.ttl=300 // optional
+ * _key.expiry=... // optional
+ * _key.prevNode.createdIndex=12 // optional
+ * _key.prevNode.modifiedIndex=34 // optional
+ * _key.prevNode.ttl=300 // optional
+ * _key.prevNode.expiration=... // optional
+ * _key.prevNode.value=... // optional
+ * </pre>
+ * @param key the key to be deleted.
+ * @return the response mpas as described above.
+ */
+ public Map<String,String> delete(String key);
+
+
+ /**
+ * Access regular Tamaya properties map as follows:
+ * <pre>
+ * key1=myvalue
+ * _key1.source=[etcd]http://127.0.0.1:4001
+ * _key1.createdIndex=12
+ * _key1.modifiedIndex=34 // optional
+ * _key1.ttl=300 // optional
+ * _key1.expiration=... // optional
+ *
+ * key2=myvaluexxx
+ * _key2.source=[etcd]http://127.0.0.1:4001
+ * _key2.createdIndex=12
+ *
+ * key3=val3
+ * _key3.source=[etcd]http://127.0.0.1:4001
+ * _key3.createdIndex=12
+ * _key3.modifiedIndex=2
+ * </pre>
+ */
+ public Map<String,String> getProperties(String directory, boolean recursive);
+
+}</code></pre>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_the_etcdpropertysource">The EtcdPropertySource</h3>
+<div class="paragraph">
+<p>The EtcdPropertySource is automatically registered and allows to configure the etcd servers to be used. 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 etcd cluster:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>The property source reads the tamaya.etcd.server.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://127.0.0.1:4001 is used. If no connection to any etcd
+server can be established a warning will be logged, but deployment will not fail.</p>
+</li>
+<li>
+<p>Additinoally also the
+accessor allows to configure the socket/connection timeouts by setting tamaya.etcd.timeout in seconds either as
+system or environment property.</p>
+</li>
+<li>
+<p>The EtcdPropertySource finally also allows the values read from the etcd cluster to be mapped to prefixed
+context. This can be activated by setting the -Dtamaya.etcd.prefix=<PREFIX> system property. E.g. when the prefix is
+set to cluster-config. a etcd 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>
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+ at <span>2016-12-19</span>
+ </p>
+ <p>
+ <b>Disclaimer</b>
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+ incubation at
+ The Apache Software Foundation (ASF), sponsored by
+ the name of Apache Incubator. Incubation is required of
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+ <h1>Apache Tamaya&#8201;&#8212;&#8201;Extension: Events</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="Core">Tamaya Events (Extension Module)</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="_overview">Overview</h3>
+<div class="paragraph">
+<p>Tamaya Events 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 Events provides an abstraction for events like change events, when configuration has been changed.</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>To benefit from configuration event 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-events</artifactId>
+ <version>{tamaya_version}</version>
+</dependency></code></pre>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_core_architecture">Core Architecture</h3>
+<div class="paragraph">
+<p>The core of the module are the ConfigEventListener interface and the ConfigEvent class, which defines an abstraction
+for event handling and observation:</p>
+</div>
+<div class="listingblock">
+<div class="title">ConfigEvent</div>
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final interface ConfigEvent<T> {
+
+ Class<T> getResourceType();
+ T getResource();
+ String getVersion();
+ long getTimestamp();
+}
+
+// @FunctionalInterface
+public interface ConfigEventListener {
+
+ void onConfigEvent(ConfigEvent<?> event);
+
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>This mechanism can now be used to propagate configuration changes to all interested stakeholders. Hereby the payload
+can be basically arbitrary as long as it implements the ConfigEvent interface. The next sections
+give more details on the the provided event types and their usage.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_modelling_configuration_changes">Modelling Configuration Changes</h3>
+<div class="paragraph">
+<p>This module provides a serializable and thread-safe abstraction modlling a configuration change. A change hereby may
+be</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>additional configuration entries</p>
+</li>
+<li>
+<p>removed configuration entries</p>
+</li>
+<li>
+<p>changes on entries</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>The most important event modelled is the ConfigurationChange class, which implements the event sent for a changed
+Configuration:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final class ConfigurationChange implements ConfigEvent<Configuration>, Serializable{
+
+ public static ConfigurationChange emptyChangeSet(Configuration configuration);
+
+ @Override
+ public Configuration getResource();
+ @Override
+ public Class<Configuration> getResourceType();
+ @Override
+ public String getVersion();
+ @Override
+ public long getTimestamp();
+
+ // Event specific methods
+
+ public Collection<PropertyChangeEvent> getChanges();
+ public int getRemovedSize();
+ public int getAddedSize();
+ public int getUpdatedSize();
+
+ public boolean isKeyAffected(String key);
+ public boolean isRemoved(String key);
+ public boolean isAdded(String key);
+ public boolean isUpdated(String key);
+ public boolean containsKey(String key);
+ public boolean isEmpty();
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>New instances of this class hereby can be created using a fluent builder:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">Configuration config = ...;
+ConfigurationChange change = ConfigurationChangeBuilder.of(config)
+ .addChange("MyKey", "newValue")
+ .removeKeys("myRemovedKey").build();</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Also it is possible to directly compare 2 instances of configurations to create ConfigurationChange that
+reflect the differences between the two configurations:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">Comparing 2 configurations
+-------------------------------------------------------
+Configuration config = ...;
+Configuration changedConfig = ...;
+ConfigurationChange change = ConfigurationChangeBuilder.of(config)
+ .addChanges(changedConfig).build();
+-------------------------------------------------------</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>So a ConfigurationChange allows you to evaluate the changes on a configuration. This allows you to listen to changes
+and react in your client code as useful, once you encounter changes that are relevant to you, e.g. by reconfiguring
+your component. For listening to configuration changes you must implement the
+ConfigEventListener functional interface:</p>
+</div>
+<div class="listingblock">
+<div class="title">Implementing a ConfigChangeListener</div>
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final class MyConfigChangeListener implements ConfigChangeListener<ConfigurationChange>{
+
+ private Configuration config = ConfigurationProvider.getConfiguration();
+
+ public void onConfigEvent(ConfigEvent<?> event){
+ if(event.getResourceTspe()==Configuration.class){
+ if(event.getConfiguration()==config){
+ // do something
+ }
+ }
+ }
+
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>You can <strong>register</strong> your implementation in 2 ways:</p>
+</div>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>Manually by calling ConfigEventManager.addListener(new MyConfigChangeListener())</p>
+</li>
+<li>
+<p>Automatically by registering your listener using the ServiceLoader under
+META-INF/services/org.apache.tamaya.events.ConfigEventListener</p>
+</li>
+</ol>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_modelling_propertysource_changes">Modelling PropertySource Changes</h3>
+<div class="paragraph">
+<p>Beside that a whole configuration changes, also PropertySource instances can change, e.g. by a configuration file
+edited on the fly. This is similarly to a ConfigurationChange reflected by the classes PropertySourceChange,
+PropertySourceChangeBuilder.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_the_configeventmanager_singleton">The ConfigEventManager Singleton</h3>
+<div class="paragraph">
+<p>Main entry point of the events module is the ConfigEventManager singleton class, which provides static accessor
+methods to the extension’s functionality:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Adding/removing of ConfigChangeListener instances, either globally or per event type.</p>
+</li>
+<li>
+<p>Firing configuration events synchronously or asyncronously (mostly called by framework code).</p>
+</li>
+<li>
+<p>Configuring the monitor that periodically checks for changes on the global Configuration provided
+by ConfigurationProvider.getConfiguration().</p>
+</li>
+</ul>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public final class ConfigEventManager {
+
+ private ConfigEventManager() {}
+
+ public static void addListener(ConfigEventListener l);
+ public static <T extends ConfigEvent> void addListener(ConfigEventListener l, Class<T> eventType);
+ public static void removeListener(ConfigEventListener l);
+ public static <T extends ConfigEvent> void removeListener(ConfigEventListener l, Class<T> eventType);
+ public static <T extends ConfigEvent>
+ Collection<? extends ConfigEventListener> getListeners();
+ public static <T extends ConfigEvent>
+ Collection<? extends ConfigEventListener> getListeners(Class<T> type);
+
+ public static <T> void fireEvent(ConfigEvent<?> event);
+ public static <T> void fireEventAsynch(ConfigEvent<?> event);
+
+ public static void enableChangeMonitoring(boolean enable);
+ public static boolean isChangeMonitoring();
+ public long getChangeMonitoringPeriod();
+ public void setChangeMonitoringPeriod(long millis);
+
+}</code></pre>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_monitoring_of_configuration_changes">Monitoring of configuration changes</h4>
+<div class="paragraph">
+<p>The ConfigEventManager also supports active monitoring of the current configuration to trigger corresponding change
+events to listeners registered. This feature is deactivated by default, but can be enabled by calling
+ConfigEventManager.enableChangeMonitoring(true);. This feature avoids regularly polling your local Configuration for
+any kind of changes. If a change has been encountered Tamaya identifies it and triggers corresponding
+ConfigurationChange events automatically.</p>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_freezing_configurations_and_propertysources">Freezing Configurations and PropertySources</h3>
+<div class="paragraph">
+<p>Configuration instances as well as PropertySources are explicitly not required to be serializable. To enable easy
+serialization of these types a Configuration's <strong>current state can be frozen</strong> (e.g. for later comparison with a newly
+loaded version). Freezing hereby means</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>all key/values are read-out by calling the getProperties() method.</p>
+</li>
+<li>
+<p>a meta data entry is added of the form _frozenAt=223273777652325677, whichdefines the UTC timestamp in
+milliseconds when this instance was frozen.</p>
+</li>
+<li>
+<p>if not already defined an _id property will be added to the Configuration containing the
+identifier of the configuration.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>In code freezing is a no-brainer:</p>
+</div>
+<div class="listingblock">
+<div class="title">Freezing the current Configuration</div>
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">Configuration config = ConfigurationProvider.getConfiguration();
+Configuration frozenConfig = FrozenConfiguration.of(config);</code></pre>
+</div>
+</div>
+<div class="olist lowerroman">
+<ol class="lowerroman" type="i">
+<li>
+<p>and similarly for a PropertySource:</p>
+</li>
+</ol>
+</div>
+<div class="listingblock">
+<div class="title">Freezing the current Configuration</div>
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">PropertySource propertySource = ...;
+PropertySource frozenSource = FrozenPropertySource.of(propertySource);</code></pre>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_spis">SPIs</h3>
+<div class="paragraph">
+<p>This component also defines an additional SPI, which allows to adapt the implementation of the main ConfigEventManager
+singleton. This enables, for example, using external eventing systems, such as CDI, instead of the default provided
+simple SE based implementation. As normal, implementation must be registered using the current ServiceContext
+active, by default using the Java ServiceLoader mechanism.</p>
+</div>
+<div class="listingblock">
+<div class="title">SPI: ConfigEventSpi</div>
+<div class="content">
+<pre class="prettyprint highlight"><code class="language-java" data-lang="java">public interface ConfigEventManagerSpi {
+
+ <T> void addListener(ConfigEventListener l);
+ <T extends ConfigEvent> void addListener(ConfigEventListener l, Class<T> eventType);
+ void removeListener(ConfigEventListener l);
+ <T extends ConfigEvent> void removeListener(ConfigEventListener l, Class<T> eventType);
+ Collection<? extends ConfigEventListener> getListeners();
+ Collection<? extends ConfigEventListener> getListeners(Class<? extends ConfigEvent> eventType);
+
+ void fireEvent(ConfigEvent<?> event);
+ void fireEventAsynch(ConfigEvent<?> event);
+
+ long getChangeMonitoringPeriod();
+ void setChangeMonitoringPeriod(long millis);
+ boolean isChangeMonitorActive();
+ void enableChangeMonitor(boolean enable);
+}</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Summarizing with the events module you can easily observe configuration changes, record the
+state of any configuration and compare configuration states to create and publish related
+change events.</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>2016-12-19</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 />
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