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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.storm.spout</a></div> |
| <h1 title="Interface ISpout" class="title">Interface ISpout</h1> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" class="external-link">Serializable</a></code></dd> |
| </dl> |
| <dl class="notes"> |
| <dt>All Known Subinterfaces:</dt> |
| <dd><code><a href="../topology/IRichSpout.html" title="interface in org.apache.storm.topology">IRichSpout</a></code></dd> |
| </dl> |
| <dl class="notes"> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="../starter/AnchoredWordCount.RandomSentenceSpout.html" title="class in org.apache.storm.starter">AnchoredWordCount.RandomSentenceSpout</a></code>, <code><a href="../topology/base/BaseRichSpout.html" title="class in org.apache.storm.topology.base">BaseRichSpout</a></code>, <code><a href="../starter/BlobStoreAPIWordCountTopology.RandomSentenceSpout.html" title="class in org.apache.storm.starter">BlobStoreAPIWordCountTopology.RandomSentenceSpout</a></code>, <code><a href="../hive/bolt/BucketTestHiveTopology.UserDataSpout.html" title="class in org.apache.storm.hive.bolt">BucketTestHiveTopology.UserDataSpout</a></code>, <code><a href="CheckpointSpout.html" title="class in org.apache.storm.spout">CheckpointSpout</a></code>, <code><a href="../clojure/ClojureSpout.html" title="class in org.apache.storm.clojure">ClojureSpout</a></code>, <code><a href="../perf/spout/ConstSpout.html" title="class in org.apache.storm.perf.spout">ConstSpout</a></code>, <code><a href="../drpc/DRPCSpout.html" title="class in org.apache.storm.drpc">DRPCSpout</a></code>, <code><a href="../elasticsearch/bolt/EsIndexTopology.UserDataSpout.html" title="class in org.apache.storm.elasticsearch.bolt">EsIndexTopology.UserDataSpout</a></code>, <code><a href="../ExclamationTopology.FixedOrderWordSpout.html" title="class in org.apache.storm">ExclamationTopology.FixedOrderWordSpout</a></code>, <code><a href="../starter/FastWordCountTopology.FastRandomSentenceSpout.html" title="class in org.apache.storm.starter">FastWordCountTopology.FastRandomSentenceSpout</a></code>, <code><a href="../testing/FeederSpout.html" title="class in org.apache.storm.testing">FeederSpout</a></code>, <code><a href="../perf/spout/FileReadSpout.html" title="class in org.apache.storm.perf.spout">FileReadSpout</a></code>, <code><a href="../testing/FixedTupleSpout.html" title="class in org.apache.storm.testing">FixedTupleSpout</a></code>, <code><a href="../flux/wrappers/spouts/FluxShellSpout.html" title="class in org.apache.storm.flux.wrappers.spouts">FluxShellSpout</a></code>, <code><a href="../hdfs/bolt/HdfsFileTopology.SentenceSpout.html" title="class in org.apache.storm.hdfs.bolt">HdfsFileTopology.SentenceSpout</a></code>, <code><a href="../hdfs/spout/HdfsSpout.html" title="class in org.apache.storm.hdfs.spout">HdfsSpout</a></code>, <code><a href="../hive/bolt/HiveTopology.UserDataSpout.html" title="class in org.apache.storm.hive.bolt">HiveTopology.UserDataSpout</a></code>, <code><a href="../hive/bolt/HiveTopologyPartitioned.UserDataSpout.html" title="class in org.apache.storm.hive.bolt">HiveTopologyPartitioned.UserDataSpout</a></code>, <code><a href="../st/topology/window/IncrementingSpout.html" title="class in org.apache.storm.st.topology.window">IncrementingSpout</a></code>, <code><a href="../starter/InOrderDeliveryTest.InOrderSpout.html" title="class in org.apache.storm.starter">InOrderDeliveryTest.InOrderSpout</a></code>, <code><a href="../jms/spout/JmsSpout.html" title="class in org.apache.storm.jms.spout">JmsSpout</a></code>, <code><a href="../kafka/spout/KafkaSpout.html" title="class in org.apache.storm.kafka.spout">KafkaSpout</a></code>, <code><a href="../lambda/LambdaSpout.html" title="class in org.apache.storm.lambda">LambdaSpout</a></code>, <code><a href="../loadgen/LoadSpout.html" title="class in org.apache.storm.loadgen">LoadSpout</a></code>, <code><a href="../trident/topology/MasterBatchCoordinator.html" title="class in org.apache.storm.trident.topology">MasterBatchCoordinator</a></code>, <code><a href="../testing/PythonShellMetricsSpout.html" title="class in org.apache.storm.testing">PythonShellMetricsSpout</a></code>, <code><a href="../starter/spout/RandomIntegerSpout.html" title="class in org.apache.storm.starter.spout">RandomIntegerSpout</a></code>, <code><a href="../starter/spout/RandomSentenceSpout.html" title="class in org.apache.storm.starter.spout">RandomSentenceSpout</a></code>, <code><a href="../starter/spout/RandomSentenceSpout.TimeStamped.html" title="class in org.apache.storm.starter.spout">RandomSentenceSpout.TimeStamped</a></code>, <code><a href="../clojure/RichShellSpout.html" title="class in org.apache.storm.clojure">RichShellSpout</a></code>, <code><a href="../trident/spout/RichSpoutBatchTriggerer.html" title="class in org.apache.storm.trident.spout">RichSpoutBatchTriggerer</a></code>, <code><a href="../hdfs/bolt/SequenceFileTopology.SentenceSpout.html" title="class in org.apache.storm.hdfs.bolt">SequenceFileTopology.SentenceSpout</a></code>, <code><a href="ShellSpout.html" title="class in org.apache.storm.spout">ShellSpout</a></code>, <code><a href="../sql/runtime/datasource/socket/spout/SocketSpout.html" title="class in org.apache.storm.sql.runtime.datasource.socket.spout">SocketSpout</a></code>, <code><a href="../testing/SpoutTracker.html" title="class in org.apache.storm.testing">SpoutTracker</a></code>, <code><a href="../perf/spout/StringGenSpout.html" title="class in org.apache.storm.perf.spout">StringGenSpout</a></code>, <code><a href="../testing/TestEventLogSpout.html" title="class in org.apache.storm.testing">TestEventLogSpout</a></code>, <code><a href="../testing/TestPlannerSpout.html" title="class in org.apache.storm.testing">TestPlannerSpout</a></code>, <code><a href="../testing/TestWordSpout.html" title="class in org.apache.storm.testing">TestWordSpout</a></code>, <code><a href="../loadgen/ThroughputVsLatency.FastRandomSentenceSpout.html" title="class in org.apache.storm.loadgen">ThroughputVsLatency.FastRandomSentenceSpout</a></code>, <code><a href="../st/topology/window/TimeDataIncrementingSpout.html" title="class in org.apache.storm.st.topology.window">TimeDataIncrementingSpout</a></code>, <code><a href="../jdbc/spout/UserSpout.html" title="class in org.apache.storm.jdbc.spout">UserSpout</a></code>, <code><a href="../starter/WordCountTopologyNode.RandomSentence.html" title="class in org.apache.storm.starter">WordCountTopologyNode.RandomSentence</a></code>, <code><a href="../perf/spout/WordGenSpout.html" title="class in org.apache.storm.perf.spout">WordGenSpout</a></code>, <code><a href="../redis/topology/WordSpout.html" title="class in org.apache.storm.redis.topology">WordSpout</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">ISpout</span><span class="extends-implements"> |
| extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" class="external-link">Serializable</a></span></div> |
| <div class="block">ISpout is the core interface for implementing spouts. A Spout is responsible for feeding messages into the topology |
| for processing. For every tuple emitted by a spout, Storm will track the (potentially very large) DAG of tuples |
| generated based on a tuple emitted by the spout. When Storm detects that every tuple in that DAG has been |
| successfully processed, it will send an ack message to the Spout. |
| |
| <p>If a tuple fails to be fully processed within the configured timeout for the topology (see |
| <a href="../Config.html" title="class in org.apache.storm"><code>Config</code></a>), Storm will send a fail message to the spout for the message. |
| |
| <p>When a Spout emits a tuple, it can tag the tuple with a message id. The message id can be any type. When Storm |
| acks or fails a message, it will pass back to the spout the same message id to identify which tuple it's referring |
| to. If the spout leaves out the message id, or sets it to null, then Storm will not track the message and the spout |
| will not receive any ack or fail callbacks for the message. |
| |
| <p>Storm executes ack, fail, and nextTuple all on the same thread. This means that an implementor of an ISpout does |
| not need to worry about concurrency issues between those methods. However, it also means that an implementor must |
| ensure that nextTuple is non-blocking: otherwise the method could block acks and fails that are pending to be |
| processed.</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#ack(java.lang.Object)" class="member-name-link">ack</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> msgId)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Storm has determined that the tuple emitted by this spout with the msgId identifier has been fully processed.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#activate()" class="member-name-link">activate</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Called when a spout has been activated out of a deactivated mode. nextTuple will be called on this spout soon.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#close()" class="member-name-link">close</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Called when an ISpout is going to be shutdown.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#deactivate()" class="member-name-link">deactivate</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Called when a spout has been deactivated. nextTuple will not be called while a spout is deactivated.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#fail(java.lang.Object)" class="member-name-link">fail</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> msgId)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">The tuple emitted by this spout with the msgId identifier has failed to be fully processed.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#nextTuple()" class="member-name-link">nextTuple</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">When this method is called, Storm is requesting that the Spout emit tuples to the output collector.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#open(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.spout.SpoutOutputCollector)" class="member-name-link">open</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a><<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>> conf, |
| <a href="../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a> context, |
| <a href="SpoutOutputCollector.html" title="class in org.apache.storm.spout">SpoutOutputCollector</a> collector)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="open(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.spout.SpoutOutputCollector)"> |
| <h3>open</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">open</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a><<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>> conf, |
| <a href="../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a> context, |
| <a href="SpoutOutputCollector.html" title="class in org.apache.storm.spout">SpoutOutputCollector</a> collector)</span></div> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster. It provides the spout with the environment in |
| which the spout executes. |
| |
| <p>This includes the:</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>conf</code> - The Storm configuration for this spout. This is the configuration provided to the topology merged in with cluster |
| configuration on this machine.</dd> |
| <dd><code>context</code> - This object can be used to get information about this task's place within the topology, including the task id and |
| component id of this task, input and output information, etc.</dd> |
| <dd><code>collector</code> - The collector is used to emit tuples from this spout. Tuples can be emitted at any time, including the open and |
| close methods. The collector is thread-safe and should be saved as an instance variable of this spout object.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="close()"> |
| <h3>close</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">close</span>()</div> |
| <div class="block">Called when an ISpout is going to be shutdown. There is no guarentee that close will be called, because the supervisor kill -9's |
| worker processes on the cluster. |
| |
| <p>The one context where close is guaranteed to be called is a topology is killed when running Storm in local mode.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="activate()"> |
| <h3>activate</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">activate</span>()</div> |
| <div class="block">Called when a spout has been activated out of a deactivated mode. nextTuple will be called on this spout soon. A spout can become |
| activated after having been deactivated when the topology is manipulated using the `storm` client.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="deactivate()"> |
| <h3>deactivate</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">deactivate</span>()</div> |
| <div class="block">Called when a spout has been deactivated. nextTuple will not be called while a spout is deactivated. The spout may or may not be |
| reactivated in the future.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="nextTuple()"> |
| <h3>nextTuple</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">nextTuple</span>()</div> |
| <div class="block">When this method is called, Storm is requesting that the Spout emit tuples to the output collector. This method should be |
| non-blocking, so if the Spout has no tuples to emit, this method should return. nextTuple, ack, and fail are all called in a tight |
| loop in a single thread in the spout task. When there are no tuples to emit, it is courteous to have nextTuple sleep for a short |
| amount of time (like a single millisecond) so as not to waste too much CPU.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ack(java.lang.Object)"> |
| <h3>ack</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">ack</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> msgId)</span></div> |
| <div class="block">Storm has determined that the tuple emitted by this spout with the msgId identifier has been fully processed. Typically, an |
| implementation of this method will take that message off the queue and prevent it from being replayed.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="fail(java.lang.Object)"> |
| <h3>fail</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">fail</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> msgId)</span></div> |
| <div class="block">The tuple emitted by this spout with the msgId identifier has failed to be fully processed. Typically, an implementation of this |
| method will put that message back on the queue to be replayed at a later time.</div> |
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