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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.shiro.event</a></div> |
| <h2 title="Interface EventBus" class="title">Interface EventBus</h2> |
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| <dd><code><a href="support/DefaultEventBus.html" title="class in org.apache.shiro.event.support">DefaultEventBus</a></code></dd> |
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| <hr> |
| <pre>public interface <a href="../../../../src-html/org/apache/shiro/event/EventBus.html#line.59">EventBus</a></pre> |
| <div class="block">An event bus can publish events to event subscribers as well as provide a mechanism for registering and unregistering |
| event subscribers. |
| <p/> |
| An event bus enables a publish/subscribe paradigm within Shiro - components can publish or consume events they |
| find relevant without needing to be tightly coupled to other components. This affords great |
| flexibility within Shiro by promoting loose coupling and high cohesion between components and a much safer pluggable |
| architecture. |
| <h2>Sending Events</h2> |
| If a component wishes to publish events to other components: |
| <pre> |
| MyEvent myEvent = createMyEvent(); |
| eventBus.publish(myEvent); |
| </pre> |
| The event bus will determine the type of event and then dispatch the event to components that wish to receive |
| events of that type. |
| <h2>Receiving Events</h2> |
| A component can receive events of interest by doing the following. |
| <ol> |
| <li>For each type of event you wish to consume, create a public method that accepts a single event argument. |
| The method argument type indicates the type of event to receive.</li> |
| <li>Annotate each of these public methods with the <a href="Subscribe.html" title="annotation in org.apache.shiro.event"><code>Subscribe</code></a> annotation.</li> |
| <li>Register the component with the event bus: |
| <pre> |
| eventBus.register(myComponent); |
| </pre> |
| </li> |
| </ol> |
| After registering the component, when when an event of a respective type is published, the component's |
| <code>Subscribe</code>-annotated method(s) will be invoked as expected. |
| <p/> |
| This design (and its constituent helper components) was largely influenced by |
| Guava's <a href="http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/eventbus/EventBus.html">EventBus</a> |
| concept, although no code was viewed/copied/imported (even though Guava code is Apache 2.0 licensed and could have |
| been used).</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.3</dd> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#publish(java.lang.Object)">publish</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> event)</code></th> |
| <td class="colLast"> |
| <div class="block">Publishes the specified event to an event subsystem that will deliver events to relevant <a href="Subscribe.html" title="annotation in org.apache.shiro.event"><code>Subscribe</code></a>rs.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#register(java.lang.Object)">register</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> subscriber)</code></th> |
| <td class="colLast"> |
| <div class="block">Registers all event handler methods on the specified instance to receive relevant events.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unregister(java.lang.Object)">unregister</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> subscriber)</code></th> |
| <td class="colLast"> |
| <div class="block">Unregisters all previously-registered event handler methods on the specified instance.</div> |
| </td> |
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| <h4>publish</h4> |
| <pre class="methodSignature">void <a href="../../../../src-html/org/apache/shiro/event/EventBus.html#line.66">publish</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> event)</pre> |
| <div class="block">Publishes the specified event to an event subsystem that will deliver events to relevant <a href="Subscribe.html" title="annotation in org.apache.shiro.event"><code>Subscribe</code></a>rs.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - The event object to distribute to relevant subscribers.</dd> |
| </dl> |
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| <h4>register</h4> |
| <pre class="methodSignature">void <a href="../../../../src-html/org/apache/shiro/event/EventBus.html#line.76">register</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> subscriber)</pre> |
| <div class="block">Registers all event handler methods on the specified instance to receive relevant events. The handler methods |
| are determined by the <code>EventBus</code> implementation, typically by using an |
| <a href="support/EventListenerResolver.html" title="interface in org.apache.shiro.event.support"><code>EventListenerResolver</code></a> |
| (e.g. <a href="support/AnnotationEventListenerResolver.html" title="class in org.apache.shiro.event.support"><code>AnnotationEventListenerResolver</code></a>).</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>subscriber</code> - the object whose event handler methods should be registered to receive events.</dd> |
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| <pre class="methodSignature">void <a href="../../../../src-html/org/apache/shiro/event/EventBus.html#line.84">unregister</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> subscriber)</pre> |
| <div class="block">Unregisters all previously-registered event handler methods on the specified instance. If the specified object |
| was not previously registered, calling this method has no effect.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>subscriber</code> - the previously</dd> |
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