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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.osgi.service.remoteserviceadmin</a></div> |
| <h1 title="Interface EndpointEventListener" class="title">Interface EndpointEventListener</h1> |
| </div> |
| <div class="contentContainer"> |
| <section class="description"> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="../../../eclipse/ecf/osgi/services/remoteserviceadmin/TopologyManagerImpl.html" title="class in org.eclipse.ecf.osgi.services.remoteserviceadmin">TopologyManagerImpl</a></code></dd> |
| </dl> |
| <hr> |
| <pre>@ConsumerType |
| public interface <span class="typeNameLabel">EndpointEventListener</span></pre> |
| <div class="block">A white board service that represents a listener for endpoints. |
| |
| An Endpoint Event Listener represents a participant in the distributed model |
| that is interested in Endpoint Descriptions. |
| |
| This white board service can be used in many different scenarios. However, |
| the primary use case is to allow a remote manager to be informed of Endpoint |
| Descriptions available in the network and inform the network about available |
| Endpoint Descriptions. |
| |
| Both the network bundle and the manager bundle register an Endpoint Event |
| Listener service. The manager informs the network bundle about Endpoints that |
| it creates. The network bundles then uses a protocol like SLP to announce |
| these local end-points to the network. |
| |
| If the network bundle discovers a new Endpoint through its discovery |
| protocol, then it sends an Endpoint Description to all the Endpoint Listener |
| services that are registered (except its own) that have specified an interest |
| in that endpoint. |
| |
| Endpoint Event Listener services can express their <i>scope</i> with the |
| service property <a href="#ENDPOINT_LISTENER_SCOPE"><code>ENDPOINT_LISTENER_SCOPE</code></a>. This service property is a |
| list of filters. An Endpoint Description should only be given to a Endpoint |
| Event Listener when there is at least one filter that matches the Endpoint |
| Description properties. |
| |
| This filter model is quite flexible. For example, a discovery bundle is only |
| interested in locally originating Endpoint Descriptions. The following filter |
| ensures that it only sees local endpoints. |
| |
| <pre> |
| (org.osgi.framework.uuid=72dc5fd9-5f8f-4f8f-9821-9ebb433a5b72) |
| </pre> |
| |
| In the same vein, a manager that is only interested in remote Endpoint |
| Descriptions can use a filter like: |
| |
| <pre> |
| (!(org.osgi.framework.uuid=72dc5fd9-5f8f-4f8f-9821-9ebb433a5b72)) |
| </pre> |
| |
| Where in both cases, the given UUID is the UUID of the local framework that |
| can be found in the Framework properties. |
| |
| The Endpoint Event Listener's scope maps very well to the service hooks. A |
| manager can just register all filters found from the Listener Hook as its |
| scope. This will automatically provide it with all known endpoints that match |
| the given scope, without having to inspect the filter string. |
| |
| In general, when an Endpoint Description is discovered, it should be |
| dispatched to all registered Endpoint Event Listener services. If a new |
| Endpoint Event Listener is registered, it should be informed about all |
| currently known Endpoints that match its scope. If a getter of the Endpoint |
| Listener service is unregistered, then all its registered Endpoint |
| Description objects must be removed. |
| |
| The Endpoint Event Listener models a <i>best effort</i> approach. |
| Participating bundles should do their utmost to keep the listeners up to |
| date, but implementers should realize that many endpoints come through |
| unreliable discovery processes. |
| |
| The Endpoint Event Listener supersedes the <a href="EndpointListener.html" title="interface in org.osgi.service.remoteserviceadmin"><code>EndpointListener</code></a> interface |
| as it also supports notifications around modifications of endpoints.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.1</dd> |
| </dl> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ENDPOINT_LISTENER_SCOPE">ENDPOINT_LISTENER_SCOPE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Specifies the interest of this listener with filters.</div> |
| </td> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#endpointChanged(org.osgi.service.remoteserviceadmin.EndpointEvent,java.lang.String)">endpointChanged</a></span>​(<a href="EndpointEvent.html" title="class in org.osgi.service.remoteserviceadmin">EndpointEvent</a> event, |
| <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> filter)</code></th> |
| <td class="colLast"> |
| <div class="block">Notification that an endpoint has changed.</div> |
| </td> |
| </tr> |
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| <h3><a id="ENDPOINT_LISTENER_SCOPE">ENDPOINT_LISTENER_SCOPE</a></h3> |
| <div class="memberSignature"><span class="modifiers">static final</span> <span class="returnType"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span> <span class="memberName">ENDPOINT_LISTENER_SCOPE</span></div> |
| <div class="block">Specifies the interest of this listener with filters. This listener is |
| only interested in Endpoint Descriptions where its properties match the |
| given filter. The type of this property must be <code>String+</code>.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.osgi.service.remoteserviceadmin.EndpointEventListener.ENDPOINT_LISTENER_SCOPE">Constant Field Values</a></dd> |
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| <h3><a id="endpointChanged(org.osgi.service.remoteserviceadmin.EndpointEvent,java.lang.String)">endpointChanged</a></h3> |
| <div class="memberSignature"><span class="returnType">void</span> <span class="memberName">endpointChanged</span>​(<span class="arguments"><a href="EndpointEvent.html" title="class in org.osgi.service.remoteserviceadmin">EndpointEvent</a> event, |
| <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> filter)</span></div> |
| <div class="block">Notification that an endpoint has changed. |
| |
| Details of the change is captured in the Endpoint Event provided. This |
| could be that an endpoint was added, removed or modified.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - The event containing the details about the change.</dd> |
| <dd><code>filter</code> - The filter from the <a href="#ENDPOINT_LISTENER_SCOPE"><code>ENDPOINT_LISTENER_SCOPE</code></a> that |
| matches (or for <a href="EndpointEvent.html#MODIFIED_ENDMATCH"><code>EndpointEvent.MODIFIED_ENDMATCH</code></a> and |
| <a href="EndpointEvent.html#REMOVED"><code>EndpointEvent.REMOVED</code></a> used to match) the endpoint, must |
| not be <code>null</code>.</dd> |
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