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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.storm.starter.bolt</a></div> |
| <h1 title="Class RollingCountBolt" class="title">Class RollingCountBolt</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><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">java.lang.Object</a> |
| <div class="inheritance"><a href="../../topology/base/BaseComponent.html" title="class in org.apache.storm.topology.base">org.apache.storm.topology.base.BaseComponent</a> |
| <div class="inheritance"><a href="../../topology/base/BaseRichBolt.html" title="class in org.apache.storm.topology.base">org.apache.storm.topology.base.BaseRichBolt</a> |
| <div class="inheritance">org.apache.storm.starter.bolt.RollingCountBolt</div> |
| </div> |
| </div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</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>, <code><a href="../../task/IBolt.html" title="interface in org.apache.storm.task">IBolt</a></code>, <code><a href="../../topology/IComponent.html" title="interface in org.apache.storm.topology">IComponent</a></code>, <code><a href="../../topology/IRichBolt.html" title="interface in org.apache.storm.topology">IRichBolt</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">RollingCountBolt</span> |
| <span class="extends-implements">extends <a href="../../topology/base/BaseRichBolt.html" title="class in org.apache.storm.topology.base">BaseRichBolt</a></span></div> |
| <div class="block">This bolt performs rolling counts of incoming objects, i.e. sliding window based counting. |
| <p/> |
| The bolt is configured by two parameters, the length of the sliding window in seconds (which influences the output |
| data of the bolt, i.e. how it will count objects) and the emit frequency in seconds (which influences how often the |
| bolt will output the latest window counts). For instance, if the window length is set to an equivalent of five |
| minutes and the emit frequency to one minute, then the bolt will output the latest five-minute sliding window every |
| minute. |
| <p/> |
| The bolt emits a rolling count tuple per object, consisting of the object itself, its latest rolling count, and the |
| actual duration of the sliding window. The latter is included in case the expected sliding window length (as |
| configured by the user) is different from the actual length, e.g. due to high system load. Note that the actual |
| window length is tracked and calculated for the window, and not individually for each object within a window. |
| <p/> |
| Note: During the startup phase you will usually observe that the bolt warns you about the actual sliding window |
| length being smaller than the expected length. This behavior is expected and is caused by the way the sliding window |
| counts are initially "loaded up". You can safely ignore this warning during startup (e.g. you will see this warning |
| during the first ~ five minutes of startup time if the window length is set to five minutes).</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="../../../../../serialized-form.html#org.apache.storm.starter.bolt.RollingCountBolt">Serialized Form</a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">RollingCountBolt</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(int,int)" class="member-name-link">RollingCountBolt</a><wbr>(int windowLengthInSeconds, |
| int emitFrequencyInSeconds)</code></div> |
| <div class="col-last odd-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== 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-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete 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-tab4"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)" class="member-name-link">declareOutputFields</a><wbr>(<a href="../../topology/OutputFieldsDeclarer.html" title="interface in org.apache.storm.topology">OutputFieldsDeclarer</a> declarer)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Declare the output schema for all the streams of this topology.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#execute(org.apache.storm.tuple.Tuple)" class="member-name-link">execute</a><wbr>(<a href="../../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a> tuple)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Process a single tuple of input.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><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>></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getComponentConfiguration()" class="member-name-link">getComponentConfiguration</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Declare configuration specific to this component.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)" class="member-name-link">prepare</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>> topoConf, |
| <a href="../../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a> context, |
| <a href="../../task/OutputCollector.html" title="class in org.apache.storm.task">OutputCollector</a> collector)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.storm.topology.base.BaseRichBolt">Methods inherited from class org.apache.storm.topology.base.<a href="../../topology/base/BaseRichBolt.html" title="class in org.apache.storm.topology.base">BaseRichBolt</a></h3> |
| <code><a href="../../topology/base/BaseRichBolt.html#cleanup()">cleanup</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>RollingCountBolt</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">RollingCountBolt</span>()</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="<init>(int,int)"> |
| <h3>RollingCountBolt</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">RollingCountBolt</span><wbr><span class="parameters">(int windowLengthInSeconds, |
| int emitFrequencyInSeconds)</span></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)"> |
| <h3>prepare</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">prepare</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>> topoConf, |
| <a href="../../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a> context, |
| <a href="../../task/OutputCollector.html" title="class in org.apache.storm.task">OutputCollector</a> collector)</span></div> |
| <div class="block"><span class="descfrm-type-label">Description copied from interface: <code><a href="../../task/IBolt.html#prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)">IBolt</a></code></span></div> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster. It provides the bolt with the environment in |
| which the bolt executes. |
| |
| <p>This includes the:</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>topoConf</code> - The Storm configuration for this bolt. 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 bolt. Tuples can be emitted at any time, including the prepare and |
| cleanup methods. The collector is thread-safe and should be saved as an instance variable of this bolt object.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="execute(org.apache.storm.tuple.Tuple)"> |
| <h3>execute</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">execute</span><wbr><span class="parameters">(<a href="../../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a> tuple)</span></div> |
| <div class="block"><span class="descfrm-type-label">Description copied from interface: <code><a href="../../task/IBolt.html#execute(org.apache.storm.tuple.Tuple)">IBolt</a></code></span></div> |
| <div class="block">Process a single tuple of input. The Tuple object contains metadata on it about which component/stream/task it came from. The values |
| of the Tuple can be accessed using Tuple#getValue. The IBolt does not have to process the Tuple immediately. It is perfectly fine to |
| hang onto a tuple and process it later (for instance, to do an aggregation or join). |
| |
| <p>Tuples should be emitted using the OutputCollector provided through the prepare method. It is required that all input tuples are |
| acked or failed at some point using the OutputCollector. Otherwise, Storm will be unable to determine when tuples coming off the |
| spouts have been completed. |
| |
| <p>For the common case of acking an input tuple at the end of the execute method, see IBasicBolt which automates this.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>tuple</code> - The input tuple to be processed.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)"> |
| <h3>declareOutputFields</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">declareOutputFields</span><wbr><span class="parameters">(<a href="../../topology/OutputFieldsDeclarer.html" title="interface in org.apache.storm.topology">OutputFieldsDeclarer</a> declarer)</span></div> |
| <div class="block"><span class="descfrm-type-label">Description copied from interface: <code><a href="../../topology/IComponent.html#declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)">IComponent</a></code></span></div> |
| <div class="block">Declare the output schema for all the streams of this topology.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>declarer</code> - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getComponentConfiguration()"> |
| <h3>getComponentConfiguration</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><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>></span> <span class="element-name">getComponentConfiguration</span>()</div> |
| <div class="block"><span class="descfrm-type-label">Description copied from interface: <code><a href="../../topology/IComponent.html#getComponentConfiguration()">IComponent</a></code></span></div> |
| <div class="block">Declare configuration specific to this component. Only a subset of the "topology.*" configs can be overridden. The component |
| configuration can be further overridden when constructing the topology using <a href="../../topology/TopologyBuilder.html" title="class in org.apache.storm.topology"><code>TopologyBuilder</code></a></div> |
| <dl class="notes"> |
| <dt>Specified by:</dt> |
| <dd><code><a href="../../topology/IComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code> in interface <code><a href="../../topology/IComponent.html" title="interface in org.apache.storm.topology">IComponent</a></code></dd> |
| <dt>Overrides:</dt> |
| <dd><code><a href="../../topology/base/BaseComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code> in class <code><a href="../../topology/base/BaseComponent.html" title="class in org.apache.storm.topology.base">BaseComponent</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
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