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| <h1 class="firstHeading">SMILA/Documentation/AgentController</h1> |
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| <h3 id="siteSub">From Eclipsepedia</h3> |
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| <table id="toc" class="toc" summary="Contents"><tr><td><div id="toctitle"><h2>Contents</h2></div> |
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| <li class="toclevel-1"><a href="AgentController.html#Overview"><span class="tocnumber">1</span> <span class="toctext">Overview</span></a></li> |
| <li class="toclevel-1"><a href="AgentController.html#API"><span class="tocnumber">2</span> <span class="toctext">API</span></a></li> |
| <li class="toclevel-1"><a href="AgentController.html#Implementations"><span class="tocnumber">3</span> <span class="toctext">Implementations</span></a> |
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| <li class="toclevel-2"><a href="AgentController.html#org.eclipse.smila.connectivity.framework.impl"><span class="tocnumber">3.1</span> <span class="toctext">org.eclipse.smila.connectivity.framework.impl</span></a></li> |
| <li class="toclevel-2"><a href="AgentController.html#Configuration"><span class="tocnumber">3.2</span> <span class="toctext">Configuration</span></a></li> |
| <li class="toclevel-2"><a href="AgentController.html#JMX_interface"><span class="tocnumber">3.3</span> <span class="toctext">JMX interface</span></a></li> |
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| <a name="Overview"></a><h2> <span class="mw-headline"> Overview </span></h2> |
| <p>The AgentController is a component that manages and monitors Agents. Whenever a new agent task is triggered (via <tt>startAgent()</tt>) a new instance of the used Agent is created and the agent object hash value is used a an id (called jobId) to identify records created by this agent instance. This jobid is set as an annotation on all records and will also visible on the agent instance in the JMX console. |
| </p> |
| <a name="API"></a><h2> <span class="mw-headline"> API </span></h2> |
| <p>AgentController provides two interfaces, one is used by management clients to start/stop agent instances, the other is used by Agents to execute callback methods on the AgentController itself, executing the ccommon processing logic. |
| </p><p>Javadoc: |
| </p> |
| <ul><li> <a href="http://build.eclipse.org/rt/smila/javadoc/current/org/eclipse/smila/connectivity/framework/AgentController.html" class="external text" title="http://build.eclipse.org/rt/smila/javadoc/current/org/eclipse/smila/connectivity/framework/AgentController.html" rel="nofollow">org.eclipse.smila.connectivity.framework.AgentController</a> |
| </li><li> <a href="http://build.eclipse.org/rt/smila/javadoc/current/org/eclipse/smila/connectivity/framework/util/AgentControllerCallback.html" class="external text" title="http://build.eclipse.org/rt/smila/javadoc/current/org/eclipse/smila/connectivity/framework/util/AgentControllerCallback.html" rel="nofollow">org.eclipse.smila.connectivity.framework.util.AgentControllerCallback</a> |
| </li></ul> |
| <a name="Implementations"></a><h2> <span class="mw-headline"> Implementations </span></h2> |
| <p>It is possible to provide different implementations for the AgentController interface. At the moment there is one implementation available. |
| </p> |
| <a name="org.eclipse.smila.connectivity.framework.impl"></a><h3> <span class="mw-headline">org.eclipse.smila.connectivity.framework.impl</span></h3> |
| <p>This bundle contains the default implementation of the AgentController interface. |
| </p><p>The AgentController implements the general processing logic common for all types of Agents. Its interface is a pure management interface that can be accessed by its Java interface or its wrapping JMX interface. It has references to the following OSGi services: |
| </p> |
| <ul><li> ConnectivityManager |
| </li><li> Agent ComponentFactory |
| </li><li> ConfigurationManagement (t.b.d.) |
| </li><li> CompoundManagement (t.b.d.) |
| </li></ul> |
| <p>Agent Factories register themselves at the AgentController. Each time an agent is started with a datasource for a specific type of agent, a new instance of that Agent type is created via the Agent ComponentFactory. This allows parallel watching of datasources with the same type (e.g. several rss feeds). Note that it is not possible to start muptiple agents on the same data source concurrently! |
| </p><p><br /> |
| This chart shows the current AgentController processing logic for one agent run: |
| <a href="http://wiki.eclipse.org/Image:AgentControllerProcessingLogic.png" class="image" title="Image:AgentControllerProcessingLogic.png"><img alt="Image:AgentControllerProcessingLogic.png" src="http://wiki.eclipse.org/images/b/bd/AgentControllerProcessingLogic.png" width="960" height="720" border="0" /></a> |
| </p> |
| <ul><li> the Agent is started, initializes DeltaIndexing for the data source by calling <tt>DeltaIndexingManager:init(...)</tt> and waits for events in a separate thread. One of the following events can occur: |
| <ul><li> ADD: a new or updated object on the datasource was detected. A record object is created. It is checked if the record was updated by calling <tt>DeltaIndexingManager:checkForUpdate(...)</tt> |
| <ul><li> YES: the record is added to the Queue by calling <tt>ConnectivityManager:add(...)</tt> and updated in the DeltaIndexingManager by calling <tt>DeltaIndexingManager:visit(...)</tt> |
| </li><li> NO: no actions are taken |
| </li></ul> |
| </li><li> DELETE: an object on the datasource was deleted. An Id object is created for the deleted object. This Id is deleted from both ConnectivityManager and DeltaIndexingManager by calling <tt>ConnectivityManager:delete(...)</tt>and <tt>DeltaIndexingManager:delete(..)</tt>. |
| </li><li> STOP: the agent is stopped either via an external command or because some fatal errors occured |
| <ul><li> it finishes DeltaIndexing by calling <tt>DeltaIndexingManager:finish(...)</tt> and ends the thread |
| </li></ul> |
| </li></ul> |
| </li></ul> |
| <p>The processing logic will be enhanced when CompoundManagement is integrated. |
| </p> |
| <dl><dt>Note |
| </dt></dl> |
| <p>The exact logic depends on the settings of DeltaIndexing in the data source configuration. Depending on the configured value, delta indexing logic is executed fully, partially or not at all. |
| </p> |
| <a name="Configuration"></a><h3> <span class="mw-headline"> Configuration </span></h3> |
| <p>There are no configuration options available for this bundle. |
| </p> |
| <a name="JMX_interface"></a><h3> <span class="mw-headline"> JMX interface </span></h3> |
| <p>Javadoc: <a href="http://build.eclipse.org/rt/smila/javadoc/current/org/eclipse/smila/connectivity/framework/AgentControllerAgent.html" class="external text" title="http://build.eclipse.org/rt/smila/javadoc/current/org/eclipse/smila/connectivity/framework/AgentControllerAgent.html" rel="nofollow">org.eclipse.smila.connectivity.framework.AgentControllerAgent</a> |
| </p><p>Here is a screenshot of the AgentController in the JMX Console: |
| </p><p><a href="http://wiki.eclipse.org/Image:AgentControllerJMX.png" class="image" title="Image:AgentControllerJMX.png"><img alt="Image:AgentControllerJMX.png" src="http://wiki.eclipse.org/images/0/06/AgentControllerJMX.png" width="583" height="448" border="0" /></a> |
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