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| <div class="subTitle">org.apache.twill.zookeeper</div> |
| <h2 title="Class ZKOperations" class="title">Class ZKOperations</h2> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
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| <li>org.apache.twill.zookeeper.ZKOperations</li> |
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| <pre>public final class <span class="typeNameLabel">ZKOperations</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Collection of helper methods for common operations that usually needed when interacting with ZooKeeper.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.Callback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.Callback</a><<a href="../../../../org/apache/twill/zookeeper/ZKOperations.Callback.html" title="type parameter in ZKOperations.Callback">T</a>></span></code> |
| <div class="block">Represents a ZK operation updates callback.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.ChildrenCallback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.ChildrenCallback</a></span></code> |
| <div class="block">Interface for defining callback method to receive children nodes updates.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.DataCallback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.DataCallback</a></span></code> |
| <div class="block">Interface for defining callback method to receive node data updates.</div> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#createDeleteIfExists-org.apache.twill.zookeeper.ZKClient-java.lang.String-byte:A-org.apache.zookeeper.CreateMode-boolean-org.apache.zookeeper.data.ACL...-">createDeleteIfExists</a></span>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| byte[] data, |
| org.apache.zookeeper.CreateMode createMode, |
| boolean createParent, |
| org.apache.zookeeper.data.ACL... acls)</code> |
| <div class="block">Creates a ZK node of the given path.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <V> <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><V></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#ignoreError-org.apache.twill.zookeeper.OperationFuture-java.lang.Class-V-">ignoreError</a></span>(<a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><V> future, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends org.apache.zookeeper.KeeperException> exceptionType, |
| V errorResult)</code> |
| <div class="block">Returns a new <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper"><code>OperationFuture</code></a> that the result will be the same as the given future, except that when |
| the source future is having an exception matching the giving exception type, the errorResult will be set |
| in to the returned <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper"><code>OperationFuture</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#recursiveDelete-org.apache.twill.zookeeper.ZKClient-java.lang.String-">recursiveDelete</a></span>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path)</code> |
| <div class="block">Deletes the given path recursively.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#watchChildren-org.apache.twill.zookeeper.ZKClient-java.lang.String-org.apache.twill.zookeeper.ZKOperations.ChildrenCallback-">watchChildren</a></span>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| <a href="../../../../org/apache/twill/zookeeper/ZKOperations.ChildrenCallback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.ChildrenCallback</a> callback)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#watchData-org.apache.twill.zookeeper.ZKClient-java.lang.String-org.apache.twill.zookeeper.ZKOperations.DataCallback-">watchData</a></span>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| <a href="../../../../org/apache/twill/zookeeper/ZKOperations.DataCallback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.DataCallback</a> callback)</code> |
| <div class="block">Watch for data changes of the given path.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static com.google.common.util.concurrent.ListenableFuture<<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#watchDeleted-org.apache.twill.zookeeper.ZKClient-java.lang.String-">watchDeleted</a></span>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/zookeeper/ZKOperations.html#watchDeleted-org.apache.twill.zookeeper.ZKClient-java.lang.String-com.google.common.util.concurrent.SettableFuture-">watchDeleted</a></span>(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| com.google.common.util.concurrent.SettableFuture<<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> completion)</code> </td> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="watchData-org.apache.twill.zookeeper.ZKClient-java.lang.String-org.apache.twill.zookeeper.ZKOperations.DataCallback-"> |
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| <h4>watchData</h4> |
| <pre>public static <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a> watchData(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| <a href="../../../../org/apache/twill/zookeeper/ZKOperations.DataCallback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.DataCallback</a> callback)</pre> |
| <div class="block">Watch for data changes of the given path. The callback will be triggered whenever changes has been |
| detected. Note that the callback won't see every single changes, as that's not the guarantee of ZooKeeper. |
| If the node doesn't exists, it will watch for its creation then starts watching for data changes. |
| When the node is deleted afterwards,</div> |
| <dl> |
| <dt><span class="paramLabel">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 the operation</dd> |
| <dd><code>path</code> - Path to watch</dd> |
| <dd><code>callback</code> - Callback to be invoked when data changes is detected.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common"><code>Cancellable</code></a> to cancel the watch.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="watchDeleted-org.apache.twill.zookeeper.ZKClient-java.lang.String-"> |
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| <h4>watchDeleted</h4> |
| <pre>public static com.google.common.util.concurrent.ListenableFuture<<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> watchDeleted(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path)</pre> |
| </li> |
| </ul> |
| <a name="watchDeleted-org.apache.twill.zookeeper.ZKClient-java.lang.String-com.google.common.util.concurrent.SettableFuture-"> |
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| <h4>watchDeleted</h4> |
| <pre>public static void watchDeleted(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| com.google.common.util.concurrent.SettableFuture<<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> completion)</pre> |
| </li> |
| </ul> |
| <a name="watchChildren-org.apache.twill.zookeeper.ZKClient-java.lang.String-org.apache.twill.zookeeper.ZKOperations.ChildrenCallback-"> |
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| <h4>watchChildren</h4> |
| <pre>public static <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a> watchChildren(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| <a href="../../../../org/apache/twill/zookeeper/ZKOperations.ChildrenCallback.html" title="interface in org.apache.twill.zookeeper">ZKOperations.ChildrenCallback</a> callback)</pre> |
| </li> |
| </ul> |
| <a name="ignoreError-org.apache.twill.zookeeper.OperationFuture-java.lang.Class-java.lang.Object-"> |
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| </a><a name="ignoreError-org.apache.twill.zookeeper.OperationFuture-java.lang.Class-V-"> |
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| <h4>ignoreError</h4> |
| <pre>public static <V> <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><V> ignoreError(<a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><V> future, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends org.apache.zookeeper.KeeperException> exceptionType, |
| V errorResult)</pre> |
| <div class="block">Returns a new <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper"><code>OperationFuture</code></a> that the result will be the same as the given future, except that when |
| the source future is having an exception matching the giving exception type, the errorResult will be set |
| in to the returned <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper"><code>OperationFuture</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>V</code> - Type of the result.</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>future</code> - The source future.</dd> |
| <dd><code>exceptionType</code> - Type of <code>KeeperException</code> to be ignored.</dd> |
| <dd><code>errorResult</code> - Object to be set into the resulting future on a matching exception.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A new <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper"><code>OperationFuture</code></a>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="recursiveDelete-org.apache.twill.zookeeper.ZKClient-java.lang.String-"> |
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| </a> |
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| <h4>recursiveDelete</h4> |
| <pre>public static <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> recursiveDelete(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path)</pre> |
| <div class="block">Deletes the given path recursively. The delete method will keep running until the given path is successfully |
| removed, which means if there are new node created under the given path while deleting, they'll get deleted |
| again. If there is <code>KeeperException</code> during the deletion other than |
| <code>KeeperException.NotEmptyException</code> or <code>KeeperException.NoNodeException</code>, |
| the exception would be reflected in the result future and deletion process will stop, |
| leaving the given path with intermediate state.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - The path to delete.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>An <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper"><code>OperationFuture</code></a> that will be completed when the given path is deleted or bailed due to |
| exception.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="createDeleteIfExists-org.apache.twill.zookeeper.ZKClient-java.lang.String-byte:A-org.apache.zookeeper.CreateMode-boolean-org.apache.zookeeper.data.ACL...-"> |
| <!-- --> |
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| <h4>createDeleteIfExists</h4> |
| <pre>public static <a href="../../../../org/apache/twill/zookeeper/OperationFuture.html" title="interface in org.apache.twill.zookeeper">OperationFuture</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> createDeleteIfExists(<a href="../../../../org/apache/twill/zookeeper/ZKClient.html" title="interface in org.apache.twill.zookeeper">ZKClient</a> zkClient, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> path, |
| <a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| byte[] data, |
| org.apache.zookeeper.CreateMode createMode, |
| boolean createParent, |
| org.apache.zookeeper.data.ACL... acls)</pre> |
| <div class="block">Creates a ZK node of the given path. If the node already exists, deletion of the node (recursively) will happen |
| and the creation will be retried.</div> |
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