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| <div class="subTitle">org.apache.beam.sdk.io</div> |
| <h2 title="Class Source" class="title">Class Source<T></h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.io.Source<T></li> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Type of elements read by the source.</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../org/apache/beam/sdk/io/BoundedSource.html" title="class in org.apache.beam.sdk.io">BoundedSource</a>, <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/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io">UnboundedSource</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre><a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SOURCE_SINK">SOURCE_SINK</a>) |
| public abstract class <span class="typeNameLabel">Source<T></span> |
| extends java.lang.Object |
| implements java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></pre> |
| <div class="block">Base class for defining input formats and creating a <code>Source</code> for reading the input. |
| |
| <p>This class is not intended to be subclassed directly. Instead, to define a bounded source (a |
| source which produces a finite amount of input), subclass <a href="../../../../../org/apache/beam/sdk/io/BoundedSource.html" title="class in org.apache.beam.sdk.io"><code>BoundedSource</code></a>; to define an |
| unbounded source, subclass <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource</code></a>. |
| |
| <p>A <code>Source</code> passed to a <code>Read</code> transform must be <code>Serializable</code>. This allows |
| the <code>Source</code> instance created in this "main program" to be sent (in serialized form) to |
| remote worker machines and reconstituted for each batch of elements of the input <code>PCollection</code> being processed or for each source splitting operation. A <code>Source</code> can have |
| instance variable state, and non-transient instance variable state will be serialized in the main |
| program and then deserialized on remote worker machines. |
| |
| <p><code>Source</code> classes MUST be effectively immutable. The only acceptable use of mutable |
| fields is to cache the results of expensive operations, and such fields MUST be marked <code>transient</code>. |
| |
| <p><code>Source</code> objects should override <code>Object.toString()</code>, as it will be used in |
| important error and debugging messages.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.io.Source">Serialized Form</a></dd> |
| </dl> |
| </li> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><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/sdk/io/Source.Reader.html" title="type parameter in Source.Reader">T</a>></span></code> |
| <div class="block">The interface that readers of custom input sources must implement.</div> |
| </td> |
| </tr> |
| </table> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/Source.html#Source--">Source</a></span>()</code> </td> |
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| <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><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/io/Source.html" title="type parameter in Source">T</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/Source.html#getDefaultOutputCoder--">getDefaultOutputCoder</a></span>()</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">Override <a href="../../../../../org/apache/beam/sdk/io/Source.html#getOutputCoder--"><code>getOutputCoder()</code></a> instead.</span></div> |
| </div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/io/Source.html" title="type parameter in Source">T</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/Source.html#getOutputCoder--">getOutputCoder</a></span>()</code> |
| <div class="block">Returns the <code>Coder</code> to use for the data read from this source.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/Source.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a> builder)</code> |
| <div class="block">Register display data for the given transform or component.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/Source.html#validate--">validate</a></span>()</code> |
| <div class="block">Checks that this source is valid, before it can be used in a pipeline.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| <!-- --> |
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| <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> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <a name="Source--"> |
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| <h4>Source</h4> |
| <pre>public Source()</pre> |
| </li> |
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| </li> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <h4>validate</h4> |
| <pre>public void validate()</pre> |
| <div class="block">Checks that this source is valid, before it can be used in a pipeline. |
| |
| <p>It is recommended to use <code>Preconditions</code> for implementing this method.</div> |
| </li> |
| </ul> |
| <a name="getDefaultOutputCoder--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getDefaultOutputCoder</h4> |
| <pre>@Deprecated |
| public <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/io/Source.html" title="type parameter in Source">T</a>> getDefaultOutputCoder()</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">Override <a href="../../../../../org/apache/beam/sdk/io/Source.html#getOutputCoder--"><code>getOutputCoder()</code></a> instead.</span></div> |
| </li> |
| </ul> |
| <a name="getOutputCoder--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getOutputCoder</h4> |
| <pre>public <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/io/Source.html" title="type parameter in Source">T</a>> getOutputCoder()</pre> |
| <div class="block">Returns the <code>Coder</code> to use for the data read from this source.</div> |
| </li> |
| </ul> |
| <a name="populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>populateDisplayData</h4> |
| <pre>public void populateDisplayData(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a> builder)</pre> |
| <div class="block">Register display data for the given transform or component. |
| |
| <p><code>populateDisplayData(DisplayData.Builder)</code> is invoked by Pipeline runners to collect |
| display data via <a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.html#from-org.apache.beam.sdk.transforms.display.HasDisplayData-"><code>DisplayData.from(HasDisplayData)</code></a>. Implementations may call <code>super.populateDisplayData(builder)</code> in order to register display data in the current namespace, |
| but should otherwise use <code>subcomponent.populateDisplayData(builder)</code> to use the namespace |
| of the subcomponent. |
| |
| <p>By default, does not register any display data. Implementors may override this method to |
| provide their own display data.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code> in interface <code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>builder</code> - The builder to populate with display data.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display"><code>HasDisplayData</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
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