151 lines
5.6 KiB
HTML
151 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="description" content="">
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<meta name="author" content="">
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<link rel="shortcut icon" href="ico/favicon.ico">
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<title>Strolch: Observers</title>
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<!-- Bootstrap core CSS -->
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<a class="navbar-brand" href="index.html">Strolch</a>
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<div class="collapse navbar-collapse">
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<ul class="nav navbar-nav">
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<li><a href="index.html">Overview</a></li>
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<li><a href="api.html">API</a></li>
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<li class="active"><a href="documentation.html">Documentation</a></li>
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<div class="page-header">
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<h1 class="page-title">Documentation: Observers</h1>
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<p class="lead page-description">This page discusses the Strolch Observers</p>
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</div>
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<div class="content">
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<p>All changes done in a Strolch transaction are recorded and then propagated to any registered observers.</p>
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<p>The observer feature is opt-in and is configured for each realm. In the <code>StrolchConfiguration.xml</code>
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file enable observers by adding the <code>enableObserverUpdates</code> propery per realm:</p>
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<pre>
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<StrolchConfiguration>
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<env id="dev">
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...
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<Component>
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<name>RealmHandler</name>
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<api>li.strolch.agent.api.RealmHandler</api>
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<impl>li.strolch.agent.impl.DefaultRealmHandler</impl>
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<depends>PrivilegeHandler</depends>
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<Properties>
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<realms>defaultRealm, otherRealm</realms>
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<enableObserverUpdates>true</enableObserverUpdates>
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<dataStoreMode>TRANSIENT</dataStoreMode>
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<dataStoreFile>StrolchModel.xml</dataStoreFile>
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<enableObserverUpdates.otherRealm>true</enableObserverUpdates.otherRealm>
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<dataStoreMode.otherRealm>TRANSIENT</dataStoreMode.otherRealm>
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<dataStoreFile.otherRealm>StrolchModel.xml</dataStoreFile.otherRealm>
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</Properties>
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</Component>
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</env>
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...
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</StrolchConfiguration></pre>
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<br />
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<p>Registering for updates is done by registering an <code>Observer</code> on the <code>ObserverHandler</code>
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of the realm itself:</p>
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<pre>
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ObserverHandler observerHandler = container.getRealm(StrolchConstants.DEFAULT_REALM).getObserverHandler();
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observerHandler.registerObserver(Tags.RESOURCE, new Observer() {
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@Override
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public void update(String key, List<StrolchRootElement> elements) {
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logger.info(elements.size() + " resources were updated!");
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}
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@Override
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public void remove(String key, List<StrolchRootElement> elements) {
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logger.info(elements.size() + " resources were removed!");
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}
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@Override
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public void add(String key, List<StrolchRootElement> elements) {
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logger.info(elements.size() + " resources were added!");
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}
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});</pre>
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<br />
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<p>Observer updates can be suppressed on the transaction by calling <code>tx.setSuppressUpdates()</code></p>
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<p class="text-muted">© Strolch / <a href="mailto:eitch@eitchnet.ch">Robert von Burg</a> / Hosting by
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<a href="http://www.eitchnet.ch">eitchnet.ch</a></p>
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