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| <h2 title="Class GenerateSequence" class="title">Class GenerateSequence</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PBegin.html" title="class in org.apache.beam.sdk.values">PBegin</a>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><java.lang.Long>></li> |
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| <li>org.apache.beam.sdk.io.GenerateSequence</li> |
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| <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> |
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| <br> |
| <pre>public abstract class <span class="typeNameLabel">GenerateSequence</span> |
| extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PBegin.html" title="class in org.apache.beam.sdk.values">PBegin</a>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><java.lang.Long>></pre> |
| <div class="block">A <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that produces longs starting from the given value, and either up to the |
| given limit or until <code>Long.MAX_VALUE</code> / until the given time elapses. |
| |
| <p>The bounded <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io"><code>GenerateSequence</code></a> is implemented based on <a href="../../../../../org/apache/beam/sdk/io/OffsetBasedSource.html" title="class in org.apache.beam.sdk.io"><code>OffsetBasedSource</code></a> and |
| <a href="../../../../../org/apache/beam/sdk/io/OffsetBasedSource.OffsetBasedReader.html" title="class in org.apache.beam.sdk.io"><code>OffsetBasedSource.OffsetBasedReader</code></a>, so it performs efficient initial splitting and it |
| supports dynamic work rebalancing. |
| |
| <p>To produce a bounded <code>PCollection<Long></code>: |
| |
| <pre><code> |
| Pipeline p = ... |
| PCollection<Long> bounded = p.apply(GenerateSequence.from(0).to(1000)); |
| </code></pre> |
| |
| <p>To produce an unbounded <code>PCollection<Long></code>, simply do not specify <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#to-long-"><code>to(long)</code></a>, |
| calling <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#withTimestampFn-org.apache.beam.sdk.transforms.SerializableFunction-"><code>withTimestampFn(SerializableFunction)</code></a> to provide values with timestamps other |
| than <a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true#now--" title="class or interface in org.joda.time"><code>Instant.now()</code></a>. |
| |
| <pre><code> |
| Pipeline p = ... |
| |
| // To use processing time as the element timestamp. |
| PCollection<Long> unbounded = p.apply(GenerateSequence.from(0)); |
| // Or, to use a provided function to set the element timestamp. |
| PCollection<Long> unboundedWithTimestamps = |
| p.apply(GenerateSequence.from(0).withTimestampFn(someFn)); |
| </code></pre> |
| |
| <p>In all cases, the sequence of numbers is generated in parallel, so there is no inherent |
| ordering between the generated values - it is only guaranteed that all values in the given range |
| will be present in the resulting <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.io.GenerateSequence">Serialized Form</a></dd> |
| </dl> |
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| <td class="colFirst"><code>static class </code></td> |
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| <div class="block">Exposes GenerateSequence as an external transform for cross-language usage.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#GenerateSequence--">GenerateSequence</a></span>()</code> </td> |
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| <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><a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><java.lang.Long></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#expand-org.apache.beam.sdk.values.PBegin-">expand</a></span>(<a href="../../../../../org/apache/beam/sdk/values/PBegin.html" title="class in org.apache.beam.sdk.values">PBegin</a> input)</code> |
| <div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given |
| <code>InputT</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#from-long-">from</a></span>(long from)</code> |
| <div class="block">Specifies the minimum number to generate (inclusive).</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/GenerateSequence.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><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#to-long-">to</a></span>(long to)</code> |
| <div class="block">Specifies the maximum number to generate (exclusive).</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#withMaxReadTime-org.joda.time.Duration-">withMaxReadTime</a></span>(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> maxReadTime)</code> |
| <div class="block">Specifies to stop generating elements after the given time.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#withRate-long-org.joda.time.Duration-">withRate</a></span>(long numElements, |
| <a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> periodLength)</code> |
| <div class="block">Specifies to generate at most a given number of elements per a given period.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html#withTimestampFn-org.apache.beam.sdk.transforms.SerializableFunction-">withTimestampFn</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a><java.lang.Long,<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>> timestampFn)</code> |
| <div class="block">Specifies the function to use to assign timestamps to the elements.</div> |
| </td> |
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| <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-java.lang.String-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getAdditionalInputs--">getAdditionalInputs</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-org.apache.beam.sdk.values.PCollection-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getKindString--">getKindString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getName--">getName</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getResourceHints--">getResourceHints</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#setResourceHints-org.apache.beam.sdk.transforms.resourcehints.ResourceHints-">setResourceHints</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#toString--">toString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#validate-org.apache.beam.sdk.options.PipelineOptions-">validate</a></code></li> |
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| </ul> |
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| <pre>public GenerateSequence()</pre> |
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| <pre>public static <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a> from(long from)</pre> |
| <div class="block">Specifies the minimum number to generate (inclusive).</div> |
| </li> |
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| <pre>public <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a> to(long to)</pre> |
| <div class="block">Specifies the maximum number to generate (exclusive).</div> |
| </li> |
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| <h4>withTimestampFn</h4> |
| <pre>public <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a> withTimestampFn(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a><java.lang.Long,<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>> timestampFn)</pre> |
| <div class="block">Specifies the function to use to assign timestamps to the elements.</div> |
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| <pre>public <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a> withRate(long numElements, |
| <a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> periodLength)</pre> |
| <div class="block">Specifies to generate at most a given number of elements per a given period.</div> |
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| <pre>public <a href="../../../../../org/apache/beam/sdk/io/GenerateSequence.html" title="class in org.apache.beam.sdk.io">GenerateSequence</a> withMaxReadTime(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> maxReadTime)</pre> |
| <div class="block">Specifies to stop generating elements after the given time.</div> |
| </li> |
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| <h4>expand</h4> |
| <pre>public <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><java.lang.Long> expand(<a href="../../../../../org/apache/beam/sdk/values/PBegin.html" title="class in org.apache.beam.sdk.values">PBegin</a> input)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">PTransform</a></code></span></div> |
| <div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given |
| <code>InputT</code>. |
| |
| <p>NOTE: This method should not be called directly. Instead apply the <code>PTransform</code> should |
| be applied to the <code>InputT</code> using the <code>apply</code> method. |
| |
| <p>Composite transforms, which are defined in terms of other transforms, should return the |
| output of one of the composed transforms. Non-composite transforms, which do not apply any |
| transforms internally, should return a new unbound output and register evaluators (via |
| backend-specific registration methods).</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">expand</a></code> in class <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PBegin.html" title="class in org.apache.beam.sdk.values">PBegin</a>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><java.lang.Long>></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-"> |
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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"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">PTransform</a></code></span></div> |
| <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="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code> in class <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PBegin.html" title="class in org.apache.beam.sdk.values">PBegin</a>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><java.lang.Long>></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> |
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