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| <div class="subTitle">org.apache.beam.runners.spark.io</div> |
| <h2 title="Class MicrobatchSource.Reader" class="title">Class MicrobatchSource.Reader</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">org.apache.beam.sdk.io.Source.Reader</a><T></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.runners.spark.io.MicrobatchSource.Reader</li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.lang.AutoCloseable</dd> |
| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="class in org.apache.beam.runners.spark.io">MicrobatchSource</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>,<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">CheckpointMarkT</a> extends <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a>></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="typeNameLabel">MicrobatchSource.Reader</span> |
| extends <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><T></pre> |
| <div class="block">Mostly based on <a href="../../../../../../org/apache/beam/sdk/io/BoundedReadFromUnboundedSource.html" title="class in org.apache.beam.sdk.io"><code>BoundedReadFromUnboundedSource</code></a>'s <code> |
| UnboundedToBoundedSourceAdapter</code>, with some adjustments for Spark specifics. |
| |
| <p>This Reader reads until one of the following thresholds has been reached: |
| |
| <ol> |
| <li>max records (per batch) |
| <li>max read duration (per batch) |
| </ol></div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <!-- --> |
| </a> |
| <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="t2" class="tableTab"><span><a href="javascript:show(2);">Instance 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>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#advance--">advance</a></span>()</code> |
| <div class="block">Advances the reader to the next valid record.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#close--">close</a></span>()</code> |
| <div class="block">Closes the reader.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">CheckpointMarkT</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#getCheckpointMark--">getCheckpointMark</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#getCurrent--">getCurrent</a></span>()</code> |
| <div class="block">Returns the value of the data item that was read by the last <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> or <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> call.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io">Source</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#getCurrentSource--">getCurrentSource</a></span>()</code> |
| <div class="block">Returns a <code>Source</code> describing the same input that this <code>Reader</code> currently reads |
| (including items already read).</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="http://www.joda.org/joda-time/apidocs/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#getCurrentTimestamp--">getCurrentTimestamp</a></span>()</code> |
| <div class="block">Returns the timestamp associated with the current data item.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="http://www.joda.org/joda-time/apidocs/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#getWatermark--">getWatermark</a></span>()</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.Reader.html#start--">start</a></span>()</code> |
| <div class="block">Initializes the reader and advances the reader to the first record.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <h3>Method Detail</h3> |
| <a name="start--"> |
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| </a> |
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| <li class="blockList"> |
| <h4>start</h4> |
| <pre>public boolean start() |
| throws java.io.IOException</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--">Source.Reader</a></code></span></div> |
| <div class="block">Initializes the reader and advances the reader to the first record. |
| |
| <p>This method should be called exactly once. The invocation should occur prior to calling |
| <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> or <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrent--"><code>Source.Reader.getCurrent()</code></a>. This method may perform expensive operations that |
| are needed to initialize the reader.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--">start</a></code> in class <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if a record was read, <code>false</code> if there is no more input available.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="advance--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>advance</h4> |
| <pre>public boolean advance() |
| throws java.io.IOException</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--">Source.Reader</a></code></span></div> |
| <div class="block">Advances the reader to the next valid record. |
| |
| <p>It is an error to call this without having called <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> first.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--">advance</a></code> in class <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if a record was read, <code>false</code> if there is no more input available.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCurrent--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCurrent</h4> |
| <pre>public <a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a> getCurrent() |
| throws java.util.NoSuchElementException</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrent--">Source.Reader</a></code></span></div> |
| <div class="block">Returns the value of the data item that was read by the last <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> or <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> call. The returned value must be effectively immutable and remain valid |
| indefinitely. |
| |
| <p>Multiple calls to this method without an intervening call to <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> should |
| return the same result.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrent--">getCurrent</a></code> in class <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.util.NoSuchElementException</code> - if <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> was never called, or if the last |
| <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> or <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> returned <code>false</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCurrentTimestamp--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCurrentTimestamp</h4> |
| <pre>public <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> getCurrentTimestamp() |
| throws java.util.NoSuchElementException</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrentTimestamp--">Source.Reader</a></code></span></div> |
| <div class="block">Returns the timestamp associated with the current data item. |
| |
| <p>If the source does not support timestamps, this should return <code>BoundedWindow.TIMESTAMP_MIN_VALUE</code>. |
| |
| <p>Multiple calls to this method without an intervening call to <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> should |
| return the same result.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrentTimestamp--">getCurrentTimestamp</a></code> in class <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.util.NoSuchElementException</code> - if the reader is at the beginning of the input and <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> or <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> wasn't called, or if the last <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#start--"><code>Source.Reader.start()</code></a> or <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#advance--"><code>Source.Reader.advance()</code></a> returned <code>false</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="close--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>close</h4> |
| <pre>public void close() |
| throws java.io.IOException</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#close--">Source.Reader</a></code></span></div> |
| <div class="block">Closes the reader. The reader cannot be used after this method is called.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>close</code> in interface <code>java.lang.AutoCloseable</code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#close--">close</a></code> in class <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCurrentSource--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCurrentSource</h4> |
| <pre>public <a href="../../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io">Source</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>> getCurrentSource()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrentSource--">Source.Reader</a></code></span></div> |
| <div class="block">Returns a <code>Source</code> describing the same input that this <code>Reader</code> currently reads |
| (including items already read). |
| |
| <p>Usually, an implementation will simply return the immutable <a href="../../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io"><code>Source</code></a> object from |
| which the current <a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io"><code>Source.Reader</code></a> was constructed, or delegate to the base class. However, |
| when using or implementing this method on a <a href="../../../../../../org/apache/beam/sdk/io/BoundedSource.BoundedReader.html" title="class in org.apache.beam.sdk.io"><code>BoundedSource.BoundedReader</code></a>, special |
| considerations apply, see documentation for <a href="../../../../../../org/apache/beam/sdk/io/BoundedSource.BoundedReader.html#getCurrentSource--"><code>BoundedSource.BoundedReader.getCurrentSource()</code></a>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html#getCurrentSource--">getCurrentSource</a></code> in class <code><a href="../../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">T</a>></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCheckpointMark--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCheckpointMark</h4> |
| <pre>public <a href="../../../../../../org/apache/beam/runners/spark/io/MicrobatchSource.html" title="type parameter in MicrobatchSource">CheckpointMarkT</a> getCheckpointMark()</pre> |
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| </ul> |
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| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getWatermark</h4> |
| <pre>public <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> getWatermark()</pre> |
| </li> |
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| </li> |
| </ul> |
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