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| <div class="subTitle">org.apache.twill.discovery</div> |
| <h2 title="Class ZKDiscoveryService" class="title">Class ZKDiscoveryService</h2> |
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| <ul class="inheritance"> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.twill.discovery.ZKDiscoveryService</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="../../../../org/apache/twill/discovery/DiscoveryService.html" title="interface in org.apache.twill.discovery">DiscoveryService</a>, <a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery">DiscoveryServiceClient</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="strong">ZKDiscoveryService</span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../org/apache/twill/discovery/DiscoveryService.html" title="interface in org.apache.twill.discovery">DiscoveryService</a>, <a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery">DiscoveryServiceClient</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></pre> |
| <div class="block">Zookeeper implementation of <a href="../../../../org/apache/twill/discovery/DiscoveryService.html" title="interface in org.apache.twill.discovery"><code>DiscoveryService</code></a> and <a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery"><code>DiscoveryServiceClient</code></a>. |
| <p> |
| Discoverable services are registered within Zookeeper under the namespace 'discoverable' by default. |
| If you would like to change the namespace under which the services are registered then you can pass |
| in the namespace during construction of <a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html" title="class in org.apache.twill.discovery"><code>ZKDiscoveryService</code></a>. |
| </p> |
| |
| <p> |
| Following is a simple example of how <a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html" title="class in org.apache.twill.discovery"><code>ZKDiscoveryService</code></a> can be used for registering services |
| and also for discovering the registered services. |
| </p> |
| |
| <blockquote> |
| <pre> |
| <code>DiscoveryService service = new ZKDiscoveryService(zkClient); |
| service.register(new Discoverable() { |
| &#64;Override |
| public String getName() { |
| return 'service-name'; |
| } |
| |
| &#64;Override |
| public InetSocketAddress getSocketAddress() { |
| return new InetSocketAddress(hostname, port); |
| } |
| }); |
| ... |
| ... |
| ServiceDiscovered services = service.discovery("service-name"); |
| ... |
| </code> |
| </pre> |
| </blockquote></div> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><strong><a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html#ZKDiscoveryService(org.apache.twill.zookeeper.ZKClient)">ZKDiscoveryService</a></strong>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient)</code> |
| <div class="block">Constructs ZKDiscoveryService using the provided zookeeper client for storing service registry.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><strong><a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html#ZKDiscoveryService(org.apache.twill.zookeeper.ZKClient,%20java.lang.String)">ZKDiscoveryService</a></strong>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> namespace)</code> |
| <div class="block">Constructs ZKDiscoveryService using the provided zookeeper client for storing service registry under namespace.</div> |
| </td> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html#close()">close</a></strong>()</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/twill/discovery/ServiceDiscovered.html" title="interface in org.apache.twill.discovery">ServiceDiscovered</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html#discover(java.lang.String)">discover</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> service)</code> |
| <div class="block">Discover service with the given name.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/twill/discovery/ZKDiscoveryService.html#register(org.apache.twill.discovery.Discoverable)">register</a></strong>(<a href="../../../../org/apache/twill/discovery/Discoverable.html" title="class in org.apache.twill.discovery">Discoverable</a> discoverable)</code> |
| <div class="block">Registers a <a href="../../../../org/apache/twill/discovery/Discoverable.html" title="class in org.apache.twill.discovery"><code>Discoverable</code></a> in zookeeper.</div> |
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| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li> |
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| <h3>Constructor Detail</h3> |
| <a name="ZKDiscoveryService(org.apache.twill.zookeeper.ZKClient)"> |
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| <h4>ZKDiscoveryService</h4> |
| <pre>public ZKDiscoveryService(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient)</pre> |
| <div class="block">Constructs ZKDiscoveryService using the provided zookeeper client for storing service registry.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>zkClient</code> - The <a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper"><code>ZKClient</code></a> for interacting with zookeeper.</dd></dl> |
| </li> |
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| <a name="ZKDiscoveryService(org.apache.twill.zookeeper.ZKClient, java.lang.String)"> |
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| <h4>ZKDiscoveryService</h4> |
| <pre>public ZKDiscoveryService(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> namespace)</pre> |
| <div class="block">Constructs ZKDiscoveryService using the provided zookeeper client for storing service registry under namespace.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>zkClient</code> - of zookeeper quorum</dd><dd><code>namespace</code> - under which the service registered would be stored in zookeeper. |
| If namespace is <code>null</code>, no namespace will be used.</dd></dl> |
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| <h4>register</h4> |
| <pre>public <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a> register(<a href="../../../../org/apache/twill/discovery/Discoverable.html" title="class in org.apache.twill.discovery">Discoverable</a> discoverable)</pre> |
| <div class="block">Registers a <a href="../../../../org/apache/twill/discovery/Discoverable.html" title="class in org.apache.twill.discovery"><code>Discoverable</code></a> in zookeeper. |
| <p> |
| Registering a <a href="../../../../org/apache/twill/discovery/Discoverable.html" title="class in org.apache.twill.discovery"><code>Discoverable</code></a> will create a node <base>/<service-name> |
| in zookeeper as a ephemeral node. If the node already exists (timeout associated with emphemeral node creation), |
| then a runtime exception is thrown to make sure that a service with an intent to register is not started without |
| registering. |
| When a runtime exception is thrown, expectation is that the process being started will fail and would be started |
| again by the monitoring service. |
| </p></div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../org/apache/twill/discovery/DiscoveryService.html#register(org.apache.twill.discovery.Discoverable)">register</a></code> in interface <code><a href="../../../../org/apache/twill/discovery/DiscoveryService.html" title="interface in org.apache.twill.discovery">DiscoveryService</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>discoverable</code> - Information of the service provider that could be discovered.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>An instance of <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common"><code>Cancellable</code></a></dd></dl> |
| </li> |
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| <h4>discover</h4> |
| <pre>public <a href="../../../../org/apache/twill/discovery/ServiceDiscovered.html" title="interface in org.apache.twill.discovery">ServiceDiscovered</a> discover(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> service)</pre> |
| <div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html#discover(java.lang.String)">DiscoveryServiceClient</a></code></strong></div> |
| <div class="block">Discover service with the given name.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html#discover(java.lang.String)">discover</a></code> in interface <code><a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery">DiscoveryServiceClient</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>service</code> - Name of the service</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>A <a href="../../../../org/apache/twill/discovery/ServiceDiscovered.html" title="interface in org.apache.twill.discovery"><code>ServiceDiscovered</code></a> object representing the result.</dd></dl> |
| </li> |
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| <h4>close</h4> |
| <pre>public void close()</pre> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true#close()" title="class or interface in java.lang">close</a></code> in interface <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd> |
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