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| <div class="subTitle">org.apache.hadoop.util.functional</div> |
| <h2 title="Class FutureIO" class="title">Class FutureIO</h2> |
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| <li>org.apache.hadoop.util.functional.FutureIO</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Unstable |
| public final class <span class="typeNameLabel">FutureIO</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">Future IO Helper methods. |
| <p> |
| Contains methods promoted from |
| <code>FutureIOSupport</code> because they |
| are a key part of integrating async IO in application code. |
| </p> |
| <p> |
| One key feature is that the <a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#awaitFuture-java.util.concurrent.Future-"><code>awaitFuture(Future)</code></a> and |
| <a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#awaitFuture-java.util.concurrent.Future-long-java.util.concurrent.TimeUnit-"><code>awaitFuture(Future, long, TimeUnit)</code></a> calls will |
| extract and rethrow exceptions raised in the future's execution, |
| including extracting the inner IOException of any |
| <code>UncheckedIOException</code> raised in the future. |
| This makes it somewhat easier to execute IOException-raising |
| code inside futures. |
| </p></div> |
| </li> |
| </ul> |
| </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> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#awaitFuture-java.util.concurrent.Future-">awaitFuture</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</a><T> future)</code> |
| <div class="block">Given a future, evaluate it.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#awaitFuture-java.util.concurrent.Future-long-java.util.concurrent.TimeUnit-">awaitFuture</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</a><T> future, |
| long timeout, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> unit)</code> |
| <div class="block">Given a future, evaluate it.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#raiseInnerCause-java.util.concurrent.CompletionException-">raiseInnerCause</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionException.html?is-external=true" title="class or interface in java.util.concurrent">CompletionException</a> e)</code> |
| <div class="block">Extract the cause of a completion failure and rethrow it if an IOE |
| or RTE.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#raiseInnerCause-java.util.concurrent.ExecutionException-">raiseInnerCause</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a> e)</code> |
| <div class="block">From the inner cause of an execution exception, extract the inner cause |
| if it is an IOE or RTE.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/util/functional/FutureIO.html#unwrapInnerException-java.lang.Throwable-">unwrapInnerException</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a> e)</code> |
| <div class="block">From the inner cause of an execution exception, extract the inner cause |
| to an IOException, raising RuntimeExceptions and Errors immediately.</div> |
| </td> |
| </tr> |
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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> |
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| <h3>Method Detail</h3> |
| <a name="awaitFuture-java.util.concurrent.Future-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>awaitFuture</h4> |
| <pre>public static <T> T awaitFuture(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</a><T> future) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></pre> |
| <div class="block">Given a future, evaluate it. |
| <p> |
| Any exception generated in the future is |
| extracted and rethrown. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - type of the result.</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>future</code> - future to evaluate</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the result, if all went well.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a></code> - future was interrupted</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if something went wrong</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></code> - any nested RTE thrown</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="awaitFuture-java.util.concurrent.Future-long-java.util.concurrent.TimeUnit-"> |
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| </a> |
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| <h4>awaitFuture</h4> |
| <pre>public static <T> T awaitFuture(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</a><T> future, |
| long timeout, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> unit) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeoutException.html?is-external=true" title="class or interface in java.util.concurrent">TimeoutException</a></pre> |
| <div class="block">Given a future, evaluate it. |
| <p> |
| Any exception generated in the future is |
| extracted and rethrown. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - type of the result.</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>future</code> - future to evaluate</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the result, if all went well.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a></code> - future was interrupted</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if something went wrong</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></code> - any nested RTE thrown</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeoutException.html?is-external=true" title="class or interface in java.util.concurrent">TimeoutException</a></code> - the future timed out.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="raiseInnerCause-java.util.concurrent.ExecutionException-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>raiseInnerCause</h4> |
| <pre>public static <T> T raiseInnerCause(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a> e) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">From the inner cause of an execution exception, extract the inner cause |
| if it is an IOE or RTE. |
| This will always raise an exception, either the inner IOException, |
| an inner RuntimeException, or a new IOException wrapping the raised |
| exception.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - type of return value.</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>e</code> - exception.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>nothing, ever.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - either the inner IOException, or a wrapper around |
| any non-Runtime-Exception</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></code> - if that is the inner cause.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="raiseInnerCause-java.util.concurrent.CompletionException-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>raiseInnerCause</h4> |
| <pre>public static <T> T raiseInnerCause(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionException.html?is-external=true" title="class or interface in java.util.concurrent">CompletionException</a> e) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Extract the cause of a completion failure and rethrow it if an IOE |
| or RTE.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - type of return value.</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>e</code> - exception.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>nothing, ever.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - either the inner IOException, or a wrapper around |
| any non-Runtime-Exception</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></code> - if that is the inner cause.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="unwrapInnerException-java.lang.Throwable-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>unwrapInnerException</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a> unwrapInnerException(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a> e)</pre> |
| <div class="block">From the inner cause of an execution exception, extract the inner cause |
| to an IOException, raising RuntimeExceptions and Errors immediately. |
| <ol> |
| <li> If it is an IOE: Return.</li> |
| <li> If it is a <a href="https://docs.oracle.com/javase/8/docs/api/java/io/UncheckedIOException.html?is-external=true" title="class or interface in java.io"><code>UncheckedIOException</code></a>: return the cause</li> |
| <li> Completion/Execution Exceptions: extract and repeat</li> |
| <li> If it is an RTE or Error: throw.</li> |
| <li> Any other type: wrap in an IOE</li> |
| </ol> |
| |
| Recursively handles wrapped Execution and Completion Exceptions in |
| case something very complicated has happened.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>e</code> - exception.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an IOException extracted or built from the cause.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></code> - if that is the inner cause.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Error.html?is-external=true" title="class or interface in java.lang">Error</a></code> - if that is the inner cause.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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