Author: buildbot
Date: Thu Oct 13 13:33:00 2016
New Revision: 999314
Log:
Staging update by buildbot for sling
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/config-resource-lookup.png
(with props)
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-and-config-reference.png
(with props)
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-default-implementation.html
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-example.png
(with props)
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-spi.html
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-configuration.html
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/illustration-sources.pptx
(with props)
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/resource-inheritance.png
(with props)
Modified:
websites/staging/sling/trunk/content/ (props changed)
websites/staging/sling/trunk/content/documentation/bundles.html
Propchange: websites/staging/sling/trunk/content/
------------------------------------------------------------------------------
--- cms:source-revision (original)
+++ cms:source-revision Thu Oct 13 13:33:00 2016
@@ -1 +1 @@
-1764627
+1764671
Modified: websites/staging/sling/trunk/content/documentation/bundles.html
==============================================================================
--- websites/staging/sling/trunk/content/documentation/bundles.html (original)
+++ websites/staging/sling/trunk/content/documentation/bundles.html Thu Oct 13
13:33:00 2016
@@ -161,6 +161,7 @@ h2:hover > .headerlink, h3:hover > .head
<li><a href="/documentation/bundles/sling-pipes.html">Sling Pipes</a></li>
<li><a href="/documentation/bundles/metrics.html">Sling Metrics</a></li>
<li><a href="/documentation/bundles/servlet-helpers.html">Servlet
Helpers</a></li>
+<li><a
href="/documentation/bundles/context-aware-configuration/context-aware-configuration.html">Context-Aware
Configuration</a></li>
</ul>
<h2 id="content-presentation">Content Presentation<a class="headerlink"
href="#content-presentation" title="Permanent link">¶</a></h2>
<ul>
@@ -184,7 +185,7 @@ h2:hover > .headerlink, h3:hover > .head
<li><a href="/documentation/bundles/log-tracers.html">Log Tracer</a></li>
</ul>
<div class="timestamp" style="margin-top: 30px; font-size: 80%;
text-align: right;">
- Rev. 1764627 by sseifert on Thu, 13 Oct 2016 08:51:00 +0000
+ Rev. 1764671 by sseifert on Thu, 13 Oct 2016 13:32:39 +0000
</div>
<div class="trademarkFooter">
Apache Sling, Sling, Apache, the Apache feather logo, and the Apache
Sling project
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/config-resource-lookup.png
==============================================================================
Binary file - no diff available.
Propchange:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/config-resource-lookup.png
------------------------------------------------------------------------------
svn:mime-type = image/png
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-and-config-reference.png
==============================================================================
Binary file - no diff available.
Propchange:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-and-config-reference.png
------------------------------------------------------------------------------
svn:mime-type = image/png
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-default-implementation.html
==============================================================================
---
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-default-implementation.html
(added)
+++
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-default-implementation.html
Thu Oct 13 13:33:00 2016
@@ -0,0 +1,201 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
+<html>
+<!--
+
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE- 2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+ <head>
+ <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
+ <title>Apache Sling - Apache Sling Context-Aware Configuration - Default
Implementation</title>
+ <link rel="icon" href="/res/favicon.ico">
+ <link rel="stylesheet" href="/res/site.css" type="text/css" media="all">
+ <link rel="stylesheet" href="/res/codehilite.css" type="text/css"
media="all">
+ </head>
+ <body>
+ <div class="title">
+ <div class="logo">
+ <a href="//sling.apache.org/">
+ <img border="0" alt="Apache Sling" src="/res/logo.png">
+ </a>
+ </div>
+ <div class="header">
+ <a href="//www.apache.org/">
+ <img border="0" alt="Apache" src="/res/apache.png">
+ </a>
+ </div>
+ </div>
+
+ <div class="menu">
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * Hide class="elementid-permalink", except when an enclosing heading
+ * has the :hover property.
+ */
+.headerlink, .elementid-permalink {
+ visibility: hidden;
+}
+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink,
h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink,
dt:hover > .elementid-permalink { visibility: visible }</style>
+<p><strong><a href="/documentation.html">Documentation</a></strong> <br />
+<a href="/documentation/getting-started.html">Getting Started</a> <br />
+<a href="/documentation/the-sling-engine.html">The Sling Engine</a> <br />
+<a href="/documentation/development.html">Development</a> <br />
+<a href="/documentation/bundles.html">Bundles</a> <br />
+<a href="/documentation/tutorials-how-tos.html">Tutorials & How-Tos</a>
<br />
+<a href="/documentation/configuration.html">Configuration</a> </p>
+<p><a href="http://s.apache.org/sling.wiki";>Wiki</a> <br />
+<a href="http://s.apache.org/sling.faq";>FAQ</a> </p>
+<p><strong>API Docs</strong> <br />
+<a href="/apidocs/sling8/index.html">Sling 8</a> <br />
+<a href="/apidocs/sling7/index.html">Sling 7</a> <br />
+<a href="/apidocs/sling6/index.html">Sling 6</a> <br />
+<a href="/apidocs/sling5/index.html">Sling 5</a> <br />
+<a href="/javadoc-io.html">Archive at javadoc.io</a> </p>
+<p><strong>Project info</strong> <br />
+<a href="/downloads.cgi">Downloads</a> <br />
+<a href="http://www.apache.org/licenses/";>License</a> <br />
+<a href="/contributing.html">Contributing</a> <br />
+<a href="/news.html">News</a> <br />
+<a href="/links.html">Links</a> <br />
+<a href="/project-information.html">Project Information</a> <br />
+<a href="https://issues.apache.org/jira/browse/SLING";>Issue Tracker</a> <br />
+<a href="http://ci.apache.org/builders/sling-trunk";>Build Server</a> <br />
+<a href="/project-information/security.html">Security</a> </p>
+<p><strong>Source</strong> <br />
+<a href="http://svn.apache.org/viewvc/sling/trunk";>Subversion</a> <br />
+<a href="git://git.apache.org/sling.git">Git</a> <br />
+<a href="https://github.com/apache/sling";>Github Mirror</a> </p>
+<p><strong>Sponsorship</strong> <br />
+<a href="http://www.apache.org/foundation/thanks.html";>Thanks</a> <br />
+<a href="http://www.apache.org/foundation/sponsorship.html";>Become a
Sponsor</a> <br />
+<a href="http://www.apache.org/foundation/buy_stuff.html";>Buy Stuff</a> </p>
+<p><strong><a href="/sitemap.html">Site Map</a></strong></p>
+<!-- no valid ads for now, we'll reactivate this when needed
+<iframe
+ src="http://www.apache.org/ads/button.html";
+ style="border-width:0; float: left" frameborder="0"
+ scrolling="no"
+ width="135"
+ height="135">
+</iframe>
+-->
+ </div>
+
+ <div class="main">
+ <div class="breadcrump" style="font-size: 80%;">
+ <a href="/">Home</a> » <a
href="/documentation.html">Documentation</a> » <a
href="/documentation/bundles.html">Bundles</a>
+ </div>
+
+
+
+ <h1>Apache Sling Context-Aware Configuration - Default
Implementation</h1>
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * Hide class="elementid-permalink", except when an enclosing heading
+ * has the :hover property.
+ */
+.headerlink, .elementid-permalink {
+ visibility: hidden;
+}
+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink,
h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink,
dt:hover > .elementid-permalink { visibility: visible }</style>
+<div class="toc">
+<ul>
+<li><a href="#about">About</a></li>
+<li><a href="#repository-paths">Repository paths</a></li>
+<li><a href="#context-paths">Context paths</a></li>
+<li><a href="#configuration-resource-resolving">Configuration resource
resolving</a></li>
+<li><a href="#configuration-persistence">Configuration persistence</a></li>
+<li><a href="#resource-inheritance">Resource inheritance</a></li>
+<li><a href="#property-inheritance">Property inheritance</a></li>
+</ul>
+</div>
+<h1 id="about">About<a class="headerlink" href="#about" title="Permanent
link">¶</a></h1>
+<p>By default the 'default implementation' us used by the Context-Aware
Configuration concerning lookup and persistence of configuration data, resource
and property inheritance and context path detection. Using the <a
href="">SPI</a> it is possible to overlay, extend or replace this
functionality.</p>
+<p>This page documents the details of the default implementation.</p>
+<h1 id="repository-paths">Repository paths<a class="headerlink"
href="#repository-paths" title="Permanent link">¶</a></h1>
+<p>By default all configuration data is stored in <code>/conf</code>. Fallback
paths are <code>/conf/global</code>, <code>/apps/conf</code>and
<code>/libs/conf</code>.</p>
+<p>The paths are configurable in the service configuration.</p>
+<h1 id="context-paths">Context paths<a class="headerlink"
href="#context-paths" title="Permanent link">¶</a></h1>
+<p>The content resource hierarchy is defined by setting
<code>sling:config-ref</code> properties. Each resource that has a
<code>sling:config-ref</code> property set defines the root resource of a
context, the whole subtree is the context. Within the subtree further nested
contexts can be defined.</p>
+<h1 id="configuration-resource-resolving">Configuration resource resolving<a
class="headerlink" href="#configuration-resource-resolving" title="Permanent
link">¶</a></h1>
+<p>This illustration shows an example for configuration resource lookup:</p>
+<p><img alt="Configuration resource lookup" src="config-resource-lookup.png"
/></p>
+<p>If you get the context-aware configuration via the API for any resource
below <code>/content/tenant1/region1/site1</code> it is looked up in this path
in this order:</p>
+<ol>
+<li><code>/conf/brand1/tenant1/region1/site1</code> - because referenced by
<code>/content/tenant1/region1/site1</code></li>
+<li><code>/conf/brand1/tenant1/region1</code> - because referenced by
<code>/content/tenant1/region1</code> (parent context)</li>
+<li><code>/conf/brand1/tenant1</code> - because referenced by
<code>/content/tenant1</code> (parent context)</li>
+<li><code>/conf/brand1</code> - because it is a parent of by
<code>/conf/brand1/tenant1</code></li>
+<li><code>/conf/global</code> - because it is configured as fallback path</li>
+<li><code>/apps/conf</code> - because it is configured as fallback path</li>
+<li><code>/libs/conf</code> - because it is configured as fallback path</li>
+</ol>
+<p>So the basic rules are:
+<em> Go up in the content resource tree until a resource with
<code>sling:config-ref</code> is found. This is the 'inner-most' context. Check
if a configuration resource exists at the path the property points to.
+</em> Check for parent resources of the references configuration resource
(below <code>/conf</code>)
+<em> Go further up in the content resource tree for parent contexts, and check
their configuration resources as well (they may reference completely different
location below <code>/conf</code>)
+</em> Check the fallback paths</p>
+<h1 id="configuration-persistence">Configuration persistence<a
class="headerlink" href="#configuration-persistence" title="Permanent
link">¶</a></h1>
+<p>Example for the resource structure for a configuration resource at
<code>/conf/mysite</code>:</p>
+<div class="codehilite"><pre><span class="o">/</span><span
class="n">conf</span>
+ <span class="o">/</span><span class="n">mysite</span>
+ <span class="o">/</span><span class="n">sling</span><span
class="p">:</span><span class="n">configs</span>
+ <span class="o">/</span><span class="n">x</span><span
class="p">.</span><span class="n">y</span><span class="p">.</span><span
class="n">z</span><span class="p">.</span><span class="n">MyConfig</span>
+ <span class="p">@</span><span class="n">prop1</span> <span
class="p">=</span> <span class="s">'value1'</span>
+ <span class="p">@</span><span class="n">prop2</span> <span
class="p">=</span> 123
+ <span class="p">@</span><span class="n">prop3</span><span
class="p">=</span> <span class="n">true</span>
+</pre></div>
+
+
+<p>Explanation:</p>
+<ul>
+<li><code>sling:configs</code> is the bucket named which is used by the
ConfigurationResolver by default for context-aware configurations. May be
another name if you use the ConfigurationResourceResolver directly.</li>
+<li><code>x.y.z.MyConfig</code> is the configuration name, in this case
derived from an annotation class. May be any other custom name as well.</li>
+<li><code>prop1..3</code>are example for configuration properties</li>
+<li>It is possible to use deeper hierarchies below <code>sling:configs</code>
as well.</li>
+<li>Nested configurations are supported as well. This can be mapped to
annotation classes referencing other annotation classes.</li>
+</ul>
+<h1 id="resource-inheritance">Resource inheritance<a class="headerlink"
href="#resource-inheritance" title="Permanent link">¶</a></h1>
+<p>We distinguish between:</p>
+<ul>
+<li>Singleton resources: Configuration resources looked up by the
<code>get</code>/<code>as</code> method variants</li>
+<li>Collection resources: Configuration resources lists looked up by the
<code>getCollection</code>/<code>asCollection</code> method variants</li>
+</ul>
+<p>For singleton resources, there is not resource inheritance. The first
resource that is found in the configuration resource resolving lookup order is
returned.</p>
+<p>For collection resources there is no resource inheritance enabled by
default. The children of the first resource that is found in the configuration
resource resolving lookup order are returned.</p>
+<p>By defining a property <code>sling:config-collection-inherit</code> on the
configuration resource, the children of the next resource that is found in the
configuration resource resolving lookup order are combined with the children of
the current configuration resource, returned a merged list. If both
configuration resources contain child resources with the same name, duplicates
are eliminated and only the children of the first resource are included.</p>
+<p>By setting the property <code>sling:config-collection-inherit</code> on
multiple configuration resources that are part of the lookup order it is
possible to form deeper inheritance chains following the same rules.</p>
+<p>Example for resource inheritance:</p>
+<p><img alt="Resource inheritance" src="resource-inheritance.png" /></p>
+<p>The result of this example is: <strong>C, A, B</strong>. It would by just
<strong>C</strong> if the <code>sling:config-collection-inherit</code> is not
set.</p>
+<h1 id="property-inheritance">Property inheritance<a class="headerlink"
href="#property-inheritance" title="Permanent link">¶</a></h1>
+<p>By default, no property inheritance takes place. That means only the
properties that are stored in the configuration resource are mapped to the
annotation class or returned as value map, regardless wither singleton or
collection resources are returned, or if resource collection inheritance is
enabled or not.</p>
+<p>By defining a property <code>sling:config-property-inherit</code> on the
configuration resource, property merging is enabled between the current
configuration resource and the next resource with the same name (singleton or
resource collection item) in the configuration resource lookup order. That
means that all properties that are not defined on the current configuration
resource are inherited from the next resources and a merged value map is used
for the configuration mapping.</p>
+<p>By setting the property <code>sling:config-property-inherit</code> on
multiple configuration resources that are part of the lookup order it is
possible to form deeper inheritance chains following the same rules.</p>
+ <div class="timestamp" style="margin-top: 30px; font-size: 80%;
text-align: right;">
+ Rev. 1764671 by sseifert on Thu, 13 Oct 2016 13:32:39 +0000
+ </div>
+ <div class="trademarkFooter">
+ Apache Sling, Sling, Apache, the Apache feather logo, and the Apache
Sling project
+ logo are trademarks of The Apache Software Foundation. All other marks
mentioned
+ may be trademarks or registered trademarks of their respective owners.
+ </div>
+ </div>
+ </body>
+</html>
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-example.png
==============================================================================
Binary file - no diff available.
Propchange:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-example.png
------------------------------------------------------------------------------
svn:mime-type = image/png
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-spi.html
==============================================================================
---
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-spi.html
(added)
+++
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-config-spi.html
Thu Oct 13 13:33:00 2016
@@ -0,0 +1,158 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
+<html>
+<!--
+
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE- 2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+ <head>
+ <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
+ <title>Apache Sling - Apache Sling Context-Aware Configuration -
SPI</title>
+ <link rel="icon" href="/res/favicon.ico">
+ <link rel="stylesheet" href="/res/site.css" type="text/css" media="all">
+ <link rel="stylesheet" href="/res/codehilite.css" type="text/css"
media="all">
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+ <a href="//sling.apache.org/">
+ <img border="0" alt="Apache Sling" src="/res/logo.png">
+ </a>
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+ <div class="header">
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+ </a>
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+
+ <div class="menu">
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * Hide class="elementid-permalink", except when an enclosing heading
+ * has the :hover property.
+ */
+.headerlink, .elementid-permalink {
+ visibility: hidden;
+}
+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink,
h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink,
dt:hover > .elementid-permalink { visibility: visible }</style>
+<p><strong><a href="/documentation.html">Documentation</a></strong> <br />
+<a href="/documentation/getting-started.html">Getting Started</a> <br />
+<a href="/documentation/the-sling-engine.html">The Sling Engine</a> <br />
+<a href="/documentation/development.html">Development</a> <br />
+<a href="/documentation/bundles.html">Bundles</a> <br />
+<a href="/documentation/tutorials-how-tos.html">Tutorials & How-Tos</a>
<br />
+<a href="/documentation/configuration.html">Configuration</a> </p>
+<p><a href="http://s.apache.org/sling.wiki";>Wiki</a> <br />
+<a href="http://s.apache.org/sling.faq";>FAQ</a> </p>
+<p><strong>API Docs</strong> <br />
+<a href="/apidocs/sling8/index.html">Sling 8</a> <br />
+<a href="/apidocs/sling7/index.html">Sling 7</a> <br />
+<a href="/apidocs/sling6/index.html">Sling 6</a> <br />
+<a href="/apidocs/sling5/index.html">Sling 5</a> <br />
+<a href="/javadoc-io.html">Archive at javadoc.io</a> </p>
+<p><strong>Project info</strong> <br />
+<a href="/downloads.cgi">Downloads</a> <br />
+<a href="http://www.apache.org/licenses/";>License</a> <br />
+<a href="/contributing.html">Contributing</a> <br />
+<a href="/news.html">News</a> <br />
+<a href="/links.html">Links</a> <br />
+<a href="/project-information.html">Project Information</a> <br />
+<a href="https://issues.apache.org/jira/browse/SLING";>Issue Tracker</a> <br />
+<a href="http://ci.apache.org/builders/sling-trunk";>Build Server</a> <br />
+<a href="/project-information/security.html">Security</a> </p>
+<p><strong>Source</strong> <br />
+<a href="http://svn.apache.org/viewvc/sling/trunk";>Subversion</a> <br />
+<a href="git://git.apache.org/sling.git">Git</a> <br />
+<a href="https://github.com/apache/sling";>Github Mirror</a> </p>
+<p><strong>Sponsorship</strong> <br />
+<a href="http://www.apache.org/foundation/thanks.html";>Thanks</a> <br />
+<a href="http://www.apache.org/foundation/sponsorship.html";>Become a
Sponsor</a> <br />
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+<!-- no valid ads for now, we'll reactivate this when needed
+<iframe
+ src="http://www.apache.org/ads/button.html";
+ style="border-width:0; float: left" frameborder="0"
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+ <div class="breadcrump" style="font-size: 80%;">
+ <a href="/">Home</a> » <a
href="/documentation.html">Documentation</a> » <a
href="/documentation/bundles.html">Bundles</a>
+ </div>
+
+
+
+ <h1>Apache Sling Context-Aware Configuration - SPI</h1>
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * Hide class="elementid-permalink", except when an enclosing heading
+ * has the :hover property.
+ */
+.headerlink, .elementid-permalink {
+ visibility: hidden;
+}
+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink,
h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink,
dt:hover > .elementid-permalink { visibility: visible }</style>
+<div class="toc">
+<ul>
+<li><a href="#about">About</a></li>
+<li><a href="#general-principles">General principles</a></li>
+<li><a href="#context-path-strategy">Context Path Strategy</a></li>
+<li><a href="#configuration-resource-resolver-strategy">Configuration Resource
Resolver Strategy</a></li>
+<li><a href="#configuration-persistence-strategy">Configuration Persistence
Strategy</a></li>
+<li><a href="#configuration-metadata-provider">Configuration Metadata
Provider</a></li>
+</ul>
+</div>
+<h1 id="about">About<a class="headerlink" href="#about" title="Permanent
link">¶</a></h1>
+<p>The Context-Aware Configuration implementation provides a set of Service
Provider Interfaces (SPI) that allows you to overlay, enhance or replace the
default implementation and adapt it to your needs.</p>
+<p>Please use the SPI with care, and first check if the <a href="">Default
Implementation</a> does not already fulfill your needs.</p>
+<h1 id="general-principles">General principles<a class="headerlink"
href="#general-principles" title="Permanent link">¶</a></h1>
+<p>All SPIs share a common principle:</p>
+<ul>
+<li>Support multiple strategies at the same time</li>
+<li>No need to switch off or âcopyâ the initial strategy</li>
+<li>Apply additional strategies only for those places where needed
(âminimally invasiveâ)</li>
+</ul>
+<p>All existing implementations are iterated in order of their service
ranking.</p>
+<h1 id="context-path-strategy">Context Path Strategy<a class="headerlink"
href="#context-path-strategy" title="Permanent link">¶</a></h1>
+<p>By providing an implementation of
<code>org.apache.sling.contextaware.config.resource.spi.ContextPathStrategy</code>
you can provide additional ways how context paths are detected in your content
resource hierarchy.</p>
+<p>E.g. you could implement detecting context paths by project-specific
conventions.</p>
+<h1 id="configuration-resource-resolver-strategy">Configuration Resource
Resolver Strategy<a class="headerlink"
href="#configuration-resource-resolver-strategy" title="Permanent
link">¶</a></h1>
+<p>By providing an implementation of
<code>org.apache.sling.contextaware.config.resource.spi.ConfigurationResourceResolvingStrategy</code>
you can define where configuration data is looked up, and how resource and
property inheritance is handled.</p>
+<h1 id="configuration-persistence-strategy">Configuration Persistence
Strategy<a class="headerlink" href="#configuration-persistence-strategy"
title="Permanent link">¶</a></h1>
+<p>By providing an implementation of
<code>org.apache.sling.contextaware.config.spi.ConfigurationPersistenceStrategy</code>
you can define the peristence structure of the configuration within the
configuration resources.</p>
+<p>E.g. you could use a specific JCR node type or slightly different content
structure to store the configuration data.</p>
+<h1 id="configuration-metadata-provider">Configuration Metadata Provider<a
class="headerlink" href="#configuration-metadata-provider" title="Permanent
link">¶</a></h1>
+<p>By providing an implementation of
<code>org.apache.sling.contextaware.config.spi.ConfigurationMetadataProvider</code>
you can provide information about configuration metadata from other sources
than annotation classes.</p>
+ <div class="timestamp" style="margin-top: 30px; font-size: 80%;
text-align: right;">
+ Rev. 1764671 by sseifert on Thu, 13 Oct 2016 13:32:39 +0000
+ </div>
+ <div class="trademarkFooter">
+ Apache Sling, Sling, Apache, the Apache feather logo, and the Apache
Sling project
+ logo are trademarks of The Apache Software Foundation. All other marks
mentioned
+ may be trademarks or registered trademarks of their respective owners.
+ </div>
+ </div>
+ </body>
+</html>
Added:
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-configuration.html
==============================================================================
---
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-configuration.html
(added)
+++
websites/staging/sling/trunk/content/documentation/bundles/context-aware-configuration/context-aware-configuration.html
Thu Oct 13 13:33:00 2016
@@ -0,0 +1,300 @@
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+ <h1>Apache Sling Context-Aware Configuration</h1>
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
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+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink,
h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink,
dt:hover > .elementid-permalink { visibility: visible }</style>
+<div class="toc">
+<ul>
+<li><a href="#about">About</a></li>
+<li><a href="#java-api">Java API</a><ul>
+<li><a href="#context-aware-resources">Context-Aware Resources</a></li>
+<li><a href="#context-aware-configurations">Context-Aware
Configurations</a></li>
+</ul>
+</li>
+<li><a href="#contexts-and-configuration-references">Contexts and
configuration references</a></li>
+<li><a href="#describe-configurations-via-annotation-classes">Describe
configurations via annotation classes</a></li>
+<li><a href="#context-aware-configuration-bnd-plugin">Context-Aware
Configuration BND plugin</a></li>
+<li><a href="#customizing-the-configuration-lookup">Customizing the
configuration lookup</a></li>
+<li><a href="#references">References</a></li>
+</ul>
+</div>
+<h1 id="about">About<a class="headerlink" href="#about" title="Permanent
link">¶</a></h1>
+<p>These bundles provide a service API that can be used to get context-aware
configurations. Context-aware configurations are configurations that are
related to a content resource or a resource tree, e.g. a web site or a tenant
site.</p>
+<p>Here is an example how your content structure may look like:</p>
+<p><img alt="Configuration example" src="context-aware-config-example.png"
/></p>
+<p>The application needs different configuration for different sites, regions
and tenants = different contexts. Some parameters may be shared, so inheritance
for nested contexts and from global fallback values is supported as well. You
have full control which content subtrees are the contexts in your application,
the structure above is only an example.</p>
+<p>Using the Context-Aware Configuration Java API you can get the matching
configuration for each content resource without caring where it is stored or
how the inheritance works.</p>
+<h1 id="java-api">Java API<a class="headerlink" href="#java-api"
title="Permanent link">¶</a></h1>
+<p>To get and use configurations, the Java API must be used. Any using code
must not make any assumptions on how the context-aware configurations are
searched or stored!</p>
+<p>The Java API consists of two parts:</p>
+<ul>
+<li>Context-Aware Resources: 'Low-level' API for accessing configuration
resources (which can be anything, e.g. workflow definitions)</li>
+<li>Context-Aware Configurations: 'High-level' API for accessing configuration
data (key/value pairs)</li>
+</ul>
+<p>In most cases you will use only the 'High-level' API for getting
context-aware configurations.</p>
+<h2 id="context-aware-resources">Context-Aware Resources<a class="headerlink"
href="#context-aware-resources" title="Permanent link">¶</a></h2>
+<p>The base concept are context-aware resources: for a given content resource,
a named configuration resource can be get.
+The service for getting the configuration resources is called the
ConfigurationResourceResolver. This service has two methods:</p>
+<ul>
+<li>getting a named configuration resource</li>
+<li>getting all child resources of a named configuration resource.</li>
+</ul>
+<p>For example to get a configuration resource for a content resource at
/content/mysite/page1, you would get a reference to the OSGi service
+<code>org.apache.sling.contextaware.config.resource.ConfigurationResourceResolver</code>
and write:</p>
+<table class="codehilitetable"><tr><td class="linenos"><div
class="linenodiv"><pre>1
+2
+3</pre></div></td><td class="code"><div class="codehilite"><pre><span
class="n">Resource</span> <span class="n">contentResource</span> <span
class="o">=</span> <span class="n">resourceResolver</span><span
class="o">.</span><span class="na">getResource</span><span
class="o">(</span><span class="s">"/content/mysite/page1"</span><span
class="o">);</span>
+
+<span class="n">Resource</span> <span class="n">configResource</span> <span
class="o">=</span> <span class="n">configurationResourceResolver</span><span
class="o">.</span><span class="na">getResource</span><span
class="o">(</span><span class="n">contentResource</span><span
class="o">,</span> <span class="s">"my-bucket"</span><span
class="o">,</span> <span class="s">"my-config"</span><span
class="o">);</span>
+</pre></div>
+</td></tr></table>
+
+<p>Or if you have several configuration resources of the same type and you
need all of them:</p>
+<table class="codehilitetable"><tr><td class="linenos"><div
class="linenodiv"><pre>1</pre></div></td><td class="code"><div
class="codehilite"><pre><span class="n">Collection</span><span
class="o"><</span><span class="n">Resource</span><span class="o">></span>
<span class="n">configResources</span> <span class="o">=</span> <span
class="n">configurationResourceResolver</span><span class="o">.</span><span
class="na">getResourceCollection</span><span class="o">(</span><span
class="n">contentResource</span><span class="o">,</span> <span
class="s">"my-bucket"</span><span class="o">,</span> <span
class="s">"my-config"</span><span class="o">);</span>
+</pre></div>
+</td></tr></table>
+
+<p>The ConfigurationResourceResolver has a concept of "buckets" (2nd parameter
in the method signatures) that allows to separate different types of
configuration resources into different resource hierarchies, so you have a
separate "namespaces" for the named configuration resources. For example one
bucket for workflow definitions, one bucket for template definitions, one for
key/value-pairs.</p>
+<p>The configuration name (3rd parameter) defines which configuration you are
interested in. The name can be a relative path as well (e.g.
<code>"sub1/my-config"</code>).</p>
+<h2 id="context-aware-configurations">Context-Aware Configurations<a
class="headerlink" href="#context-aware-configurations" title="Permanent
link">¶</a></h2>
+<p>While context-aware resources give you pure resources and your application
code can decide what to do with it,
+the most common use case is some configuration. A configuration is usually
described by an annotation class
+(like Declarative Services does for component configurations). These are typed
configuration objects
+and the context-aware configuration support automatically converts resources
into the wanted configuration type.</p>
+<p>Context-aware configurations are built on top of context-aware resources.
The same concept is used: configurations are
+named and the service to get them is the ConfigurationResolver. You can get a
reference to the OSGi service
+<code>org.apache.sling.contextaware.config.ConfigurationResolver</code> - it
has a single method to get a ConfigurationBuilder.
+Alternatively you can directly adapt your content resource directly to the
ConfigurationBuilder interface and get the configuration:</p>
+<table class="codehilitetable"><tr><td class="linenos"><div
class="linenodiv"><pre>1
+2
+3</pre></div></td><td class="code"><div class="codehilite"><pre><span
class="n">Resource</span> <span class="n">contentResource</span> <span
class="o">=</span> <span class="n">resourceResolver</span><span
class="o">.</span><span class="na">getResource</span><span
class="o">(</span><span class="s">"/content/mysite/page1"</span><span
class="o">);</span>
+
+<span class="n">MyConfig</span> <span class="n">config</span> <span
class="o">=</span> <span class="n">contentResource</span><span
class="o">.</span><span class="na">adaptTo</span><span class="o">(</span><span
class="n">ConfigurationBuilder</span><span class="o">.</span><span
class="na">class</span><span class="o">).</span><span class="na">as</span><span
class="o">(</span><span class="n">MyConfig</span><span class="o">.</span><span
class="na">class</span><span class="o">);</span>
+</pre></div>
+</td></tr></table>
+
+<p>Or if you want to get a list of configurations:</p>
+<table class="codehilitetable"><tr><td class="linenos"><div
class="linenodiv"><pre>1</pre></div></td><td class="code"><div
class="codehilite"><pre><span class="n">Collection</span><span
class="o"><</span><span class="n">MyConfig</span><span class="o">></span>
<span class="n">configs</span> <span class="o">=</span> <span
class="n">contentResource</span><span class="o">.</span><span
class="na">adaptTo</span><span class="o">(</span><span
class="n">ConfigurationBuilder</span><span class="o">.</span><span
class="na">class</span><span class="o">).</span><span
class="na">asCollection</span><span class="o">(</span><span
class="n">MyConfig</span><span class="o">.</span><span
class="na">class</span><span class="o">);</span>
+</pre></div>
+</td></tr></table>
+
+<p>The ConfigurationBuilder also supports getting the configurations as
ValueMap or by adapting the configuration resources e.g. to a Sling Model. In
this case you have to specify a configuration name which is otherwise derived
automatically from the annotation class.</p>
+<p>Internally the ConfigurationResolver used the ConfigurationResourceResolver
to get the configuration resources. It uses always the bucket name
<code>sling:configs</code>.</p>
+<h1 id="contexts-and-configuration-references">Contexts and configuration
references<a class="headerlink" href="#contexts-and-configuration-references"
title="Permanent link">¶</a></h1>
+<p>When you use the <a href="">Default Implementation</a> contexts in the
content resource hierarchy is defined by setting <code>sling:config-ref</code>
properties. Each resource that has a <code>sling:config-ref</code> property set
defines the root resource of a context, the whole subtree is the context.
Within the subtree further nested contexts can be defined. The property
contains a resource path pointing to a resource below <code>/conf</code>. This
is the configuration reference.</p>
+<p>Example:</p>
+<p><img alt="Context and config reference"
src="context-and-config-reference.png" /></p>
+<p>If you define nested contexts or use a deeper hierarchy of resourced in
<code>/conf</code> the inheritance rules are applied. Additionally it is
possible to define default values as fallback if no configuration resource
exists yet in <code>/conf</code>. See <a href="">Default Implementation</a> for
details.</p>
+<h1 id="describe-configurations-via-annotation-classes">Describe
configurations via annotation classes<a class="headerlink"
href="#describe-configurations-via-annotation-classes" title="Permanent
link">¶</a></h1>
+<p>You need an annotation class for each configuration you want to read via
the ConfigurationBuilder. The annotation classes may be provided by
+the applications/libraries you use, or you can define your own annotation
classes for your application.</p>
+<p>The annotation class may look like this:</p>
+<table class="codehilitetable"><tr><td class="linenos"><div
class="linenodiv"><pre> 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ 9
+10
+11
+12
+13</pre></div></td><td class="code"><div class="codehilite"><pre><span
class="nd">@Configuration</span><span class="o">(</span><span
class="n">label</span><span class="o">=</span><span class="s">"My
Configuration"</span><span class="o">,</span> <span
class="n">description</span><span class="o">=</span><span
class="s">"Describe me"</span><span class="o">)</span>
+<span class="kd">public</span> <span class="nd">@interface</span> <span
class="n">MyConfig</span> <span class="o">{</span>
+
+ <span class="nd">@Property</span><span class="o">(</span><span
class="n">label</span><span class="o">=</span><span class="s">"Parameter
#1"</span><span class="o">,</span> <span class="n">description</span><span
class="o">=</span><span class="s">"Describe me"</span><span
class="o">)</span>
+ <span class="n">String</span> <span class="nf">param1</span><span
class="o">();</span>
+
+ <span class="nd">@Property</span><span class="o">(</span><span
class="n">label</span><span class="o">=</span><span class="s">"Parameter
with Default value"</span><span class="o">,</span> <span
class="n">description</span><span class="o">=</span><span
class="s">"Describe me"</span><span class="o">)</span>
+ <span class="n">String</span> <span
class="nf">paramWithDefault</span><span class="o">()</span> <span
class="k">default</span> <span class="s">"defValue"</span><span
class="o">;</span>
+
+ <span class="nd">@Property</span><span class="o">(</span><span
class="n">label</span><span class="o">=</span><span class="s">"Integer
parameter"</span><span class="o">,</span> <span
class="n">description</span><span class="o">=</span><span
class="s">"Describe me"</span><span class="o">)</span>
+ <span class="kt">int</span> <span class="nf">intParam</span><span
class="o">();</span>
+
+<span class="o">}</span>
+</pre></div>
+</td></tr></table>
+
+<p>The <code>@Configuration</code> annotation is mandatory. All properties on
the <code>@Configuration</code> annotation and the <code>@Property</code>
annotations are optional - they provide additional metadata for tooling e.g.
configuration editors. </p>
+<p>By default the annotation class name is used as configuration name, which
is also the recommended option. If you want to use an arbitrary configuration
name you can specify it via a <code>name</code> property on the
<code>@Configuration</code> annotation.</p>
+<p>You may specify custom properties (via <code>property</code> string array)
for the configuration class or each properties. They are not used by the Sling
Context-Aware configuration implementation, but may be used by additional
tooling to manage the configurations.</p>
+<p>If you provide your own configuration annotation classes in your bundle,
you have to export them and list all class names in a bundle header named
<code>Sling-ContextAware-Configuration-Classes</code> - example:</p>
+<div class="codehilite"><pre><span class="n">Sling</span><span
class="o">-</span><span class="n">ContextAware</span><span
class="o">-</span><span class="n">Configuration</span><span
class="o">-</span><span class="n">Classes</span><span class="p">:</span> <span
class="n">x</span><span class="p">.</span><span class="n">y</span><span
class="p">.</span><span class="n">z</span><span class="p">.</span><span
class="n">MyConfig</span><span class="p">,</span> <span class="n">x</span><span
class="p">.</span><span class="n">y</span><span class="p">.</span><span
class="n">z</span><span class="p">.</span><span class="n">MyConfig2</span>
+</pre></div>
+
+
+<p>To automate this you can use the Context-Aware Configuration BND plugin
(see next chapter). </p>
+<h1 id="context-aware-configuration-bnd-plugin">Context-Aware Configuration
BND plugin<a class="headerlink" href="#context-aware-configuration-bnd-plugin"
title="Permanent link">¶</a></h1>
+<p>A <a href="http://bnd.bndtools.org/";>BND</a> plugin is provided that scans
the classpath of a bundle Maven project at build time and automatically
generates a <code>Sling-ContextAware-Configuration-Classes</code> bundle header
for all annotation classes annotated with <code>@Configuration</code>. It can
be used by both <a
href="http://felix.apache.org/documentation/subprojects/apache-felix-maven-bundle-plugin-bnd.html";>maven-bundle-plugin</a>
and <a
href="https://github.com/bndtools/bnd/tree/master/maven";>bnd-maven-plugin</a>,
as both use the BND library internally.</p>
+<p>Example configuration:</p>
+<table class="codehilitetable"><tr><td class="linenos"><div
class="linenodiv"><pre> 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ 9
+10
+11
+12
+13
+14
+15
+16
+17
+18</pre></div></td><td class="code"><div class="codehilite"><pre><span
class="nt"><plugin></span>
+ <span class="nt"><groupId></span>org.apache.felix<span
class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>maven-bundle-plugin<span
class="nt"></artifactId></span>
+ <span class="nt"><extensions></span>true<span
class="nt"></extensions></span>
+ <span class="nt"><configuration></span>
+ <span class="nt"><instructions></span>
+ <span class="c"><!-- Generate bundle header containing all
configuration annotation classes --></span>
+ <span
class="nt"><_plugin></span>org.apache.sling.contextaware.config.bndplugin.ConfigurationClassScannerPlugin<span
class="nt"></_plugin></span>
+ <span class="nt"></instructions></span>
+ <span class="nt"></configuration></span>
+ <span class="nt"><dependencies></span>
+ <span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>org.apache.sling<span
class="nt"></groupId></span>
+ <span
class="nt"><artifactId></span>org.apache.sling.contextaware.config.bnd-plugin<span
class="nt"></artifactId></span>
+ <span class="nt"><version></span>1.0.0<span
class="nt"></version></span>
+ <span class="nt"></dependency></span>
+ <span class="nt"></dependencies></span>
+<span class="nt"></plugin></span>
+</pre></div>
+</td></tr></table>
+
+<h1 id="customizing-the-configuration-lookup">Customizing the configuration
lookup<a class="headerlink" href="#customizing-the-configuration-lookup"
title="Permanent link">¶</a></h1>
+<p>The Context-Aware Configuration implementation provides a set of Service
Provider Interfaces (SPI) that allows you to overlay, enhance or replace the
default implementation and adapt it to your needs.</p>
+<p>See <a href="">SPI</a> for details.</p>
+<h1 id="references">References<a class="headerlink" href="#references"
title="Permanent link">¶</a></h1>
+<ul>
+<li><a href="">Context-Aware Configuration - Default Implementation</a></li>
+<li><a href="">Context-Aware Configuration - SPI</a></li>
+<li><a
href="https://adapt.to/2016/en/schedule/sling-context-aware-configuration.html";>Sling
Context-Aware Configuration - Talk from adaptTo() 2016</a></li>
+</ul>
+ <div class="timestamp" style="margin-top: 30px; font-size: 80%;
text-align: right;">
+ Rev. 1764671 by sseifert on Thu, 13 Oct 2016 13:32:39 +0000
+ </div>
+ <div class="trademarkFooter">
+ Apache Sling, Sling, Apache, the Apache feather logo, and the Apache
Sling project
+ logo are trademarks of The Apache Software Foundation. All other marks
mentioned
+ may be trademarks or registered trademarks of their respective owners.
+ </div>
+ </div>
+ </body>
+</html>
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