| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <!-- NewPage --> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (1.8.0_77) on Mon Oct 24 00:05:44 UTC 2016 --> |
| <title>PressureReliever (Edgent v1.0.0)</title> |
| <meta name="date" content="2016-10-24"> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| <script type="text/javascript" src="../../../../../script.js"></script> |
| </head> |
| <body> |
| <script type="text/javascript"><!-- |
| try { |
| if (location.href.indexOf('is-external=true') == -1) { |
| parent.document.title="PressureReliever (Edgent v1.0.0)"; |
| } |
| } |
| catch(err) { |
| } |
| //--> |
| var methods = {"i0":10,"i1":10,"i2":10}; |
| var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],8:["t4","Concrete Methods"]}; |
| var altColor = "altColor"; |
| var rowColor = "rowColor"; |
| var tableTab = "tableTab"; |
| var activeTableTab = "activeTableTab"; |
| </script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="topNav"><a name="navbar.top"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.top.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../overview-summary.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="class-use/PressureReliever.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../org/apache/edgent/oplet/plumbing/Isolate.html" title="class in org.apache.edgent.oplet.plumbing"><span class="typeNameLink">Prev Class</span></a></li> |
| <li><a href="../../../../../org/apache/edgent/oplet/plumbing/UnorderedIsolate.html" title="class in org.apache.edgent.oplet.plumbing"><span class="typeNameLink">Next Class</span></a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../index.html?org/apache/edgent/oplet/plumbing/PressureReliever.html" target="_top">Frames</a></li> |
| <li><a href="PressureReliever.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_top"> |
| <li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_top"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li>Field | </li> |
| <li><a href="#constructor.summary">Constr</a> | </li> |
| <li><a href="#method.summary">Method</a></li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li><a href="#constructor.detail">Constr</a> | </li> |
| <li><a href="#method.detail">Method</a></li> |
| </ul> |
| </div> |
| <a name="skip.navbar.top"> |
| <!-- --> |
| </a></div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="subTitle">org.apache.edgent.oplet.plumbing</div> |
| <h2 title="Class PressureReliever" class="title">Class PressureReliever<T,K></h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/edgent/oplet/core/AbstractOplet.html" title="class in org.apache.edgent.oplet.core">org.apache.edgent.oplet.core.AbstractOplet</a><I,O></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/edgent/oplet/core/Pipe.html" title="class in org.apache.edgent.oplet.core">org.apache.edgent.oplet.core.Pipe</a><T,T></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.edgent.oplet.plumbing.PressureReliever<T,K></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type.</dd> |
| <dd><code>K</code> - Key type.</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable, java.lang.AutoCloseable, <a href="../../../../../org/apache/edgent/function/Consumer.html" title="interface in org.apache.edgent.function">Consumer</a><T>, <a href="../../../../../org/apache/edgent/oplet/Oplet.html" title="interface in org.apache.edgent.oplet">Oplet</a><T,T></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="typeNameLabel">PressureReliever<T,K></span> |
| extends <a href="../../../../../org/apache/edgent/oplet/core/Pipe.html" title="class in org.apache.edgent.oplet.core">Pipe</a><T,T></pre> |
| <div class="block">Relieve pressure on upstream oplets by discarding tuples. |
| This oplet ensures that upstream processing is not |
| constrained by any delay in downstream processing, |
| for example by a sink oplet not being able to connect |
| to its external system. |
| When downstream processing cannot keep up with the input rate |
| this oplet maintains a defined window of the most recent |
| tuples and discards any earlier tuples using arrival order. |
| <P> |
| A window partition is maintained for each key seen |
| on the input stream. Any tuple arriving on the input |
| stream is inserted into the window. Asynchronously |
| tuples are taken from the window using FIFO and |
| submitted downstream. The submission of tuples maintains |
| order within a partition but not across partitions. |
| </P> |
| <P> |
| Tuples are <B>discarded and not</B> submitted to the |
| output port if the downstream processing cannot keep up |
| the incoming tuple rate. |
| </P> |
| <UL> |
| <LI>For a <a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html#PressureReliever-int-org.apache.edgent.function.Function-"><code>count</code></a> |
| <code>PressureReliever</code> up to last (most recent) <code>N</code> tuples |
| are maintained in a window partition. |
| <BR> Asynchronous tuple submission removes the last (oldest) tuple in the partition |
| before submitting it downstream. |
| <BR> If when an input tuple is processed the window partition contains N tuples, then |
| the first (oldest) tuple in the partition is discarded before the input tuple is inserted into the window. |
| </UL> |
| <P> |
| Insertion of the oplet into a stream disconnects the |
| upstream processing from the downstream processing, |
| so that downstream processing is executed on a different |
| thread to the thread that processed the input tuple. |
| </P></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.edgent.oplet.plumbing.PressureReliever">Serialized Form</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.summary"> |
| <!-- --> |
| </a> |
| <h3>Constructor Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html#PressureReliever-int-org.apache.edgent.function.Function-">PressureReliever</a></span>(int count, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>,<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">K</a>> keyFunction)</code> |
| <div class="block">Pressure reliever that maintains up to <code>count</code> most recent tuples per key.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </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>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html#accept-T-">accept</a></span>(<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a> tuple)</code> |
| <div class="block">Apply the function to <code>value</code>.</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/edgent/oplet/plumbing/PressureReliever.html#close--">close</a></span>()</code> </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/edgent/oplet/plumbing/PressureReliever.html#initialize-org.apache.edgent.oplet.OpletContext-">initialize</a></span>(<a href="../../../../../org/apache/edgent/oplet/OpletContext.html" title="interface in org.apache.edgent.oplet">OpletContext</a><<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>,<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>> context)</code> |
| <div class="block">Initialize the oplet.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.edgent.oplet.core.Pipe"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.edgent.oplet.core.<a href="../../../../../org/apache/edgent/oplet/core/Pipe.html" title="class in org.apache.edgent.oplet.core">Pipe</a></h3> |
| <code><a href="../../../../../org/apache/edgent/oplet/core/Pipe.html#getDestination--">getDestination</a>, <a href="../../../../../org/apache/edgent/oplet/core/Pipe.html#getInputs--">getInputs</a>, <a href="../../../../../org/apache/edgent/oplet/core/Pipe.html#start--">start</a>, <a href="../../../../../org/apache/edgent/oplet/core/Pipe.html#submit-O-">submit</a></code></li> |
| </ul> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.edgent.oplet.core.AbstractOplet"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.edgent.oplet.core.<a href="../../../../../org/apache/edgent/oplet/core/AbstractOplet.html" title="class in org.apache.edgent.oplet.core">AbstractOplet</a></h3> |
| <code><a href="../../../../../org/apache/edgent/oplet/core/AbstractOplet.html#getOpletContext--">getOpletContext</a></code></li> |
| </ul> |
| <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"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="PressureReliever-int-org.apache.edgent.function.Function-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>PressureReliever</h4> |
| <pre>public PressureReliever(int count, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>,<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">K</a>> keyFunction)</pre> |
| <div class="block">Pressure reliever that maintains up to <code>count</code> most recent tuples per key.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>count</code> - Number of tuples to maintain where downstream processing cannot keep up.</dd> |
| <dd><code>keyFunction</code> - Key function for tuples.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="initialize-org.apache.edgent.oplet.OpletContext-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>initialize</h4> |
| <pre>public void initialize(<a href="../../../../../org/apache/edgent/oplet/OpletContext.html" title="interface in org.apache.edgent.oplet">OpletContext</a><<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>,<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>> context)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/edgent/oplet/Oplet.html#initialize-org.apache.edgent.oplet.OpletContext-">Oplet</a></code></span></div> |
| <div class="block">Initialize the oplet.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/edgent/oplet/Oplet.html#initialize-org.apache.edgent.oplet.OpletContext-">initialize</a></code> in interface <code><a href="../../../../../org/apache/edgent/oplet/Oplet.html" title="interface in org.apache.edgent.oplet">Oplet</a><<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>,<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/edgent/oplet/core/Pipe.html#initialize-org.apache.edgent.oplet.OpletContext-">initialize</a></code> in class <code><a href="../../../../../org/apache/edgent/oplet/core/Pipe.html" title="class in org.apache.edgent.oplet.core">Pipe</a><<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>,<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - the OpletContext</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="accept-java.lang.Object-"> |
| <!-- --> |
| </a><a name="accept-T-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>accept</h4> |
| <pre>public void accept(<a href="../../../../../org/apache/edgent/oplet/plumbing/PressureReliever.html" title="type parameter in PressureReliever">T</a> tuple)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/edgent/function/Consumer.html#accept-T-">Consumer</a></code></span></div> |
| <div class="block">Apply the function to <code>value</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tuple</code> - Value function is applied to.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="close--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>close</h4> |
| <pre>public void close() |
| throws java.lang.Exception</pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <!-- ========= END OF CLASS DATA ========= --> |
| <!-- ======= START OF BOTTOM NAVBAR ====== --> |
| <div class="bottomNav"><a name="navbar.bottom"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.bottom.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../overview-summary.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="class-use/PressureReliever.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html">Help</a></li> |
| </ul> |
| <div class="aboutLanguage"><a href="http://edgent.incubator.apache.org">Apache Edgent (incubating)</a></div> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../org/apache/edgent/oplet/plumbing/Isolate.html" title="class in org.apache.edgent.oplet.plumbing"><span class="typeNameLink">Prev Class</span></a></li> |
| <li><a href="../../../../../org/apache/edgent/oplet/plumbing/UnorderedIsolate.html" title="class in org.apache.edgent.oplet.plumbing"><span class="typeNameLink">Next Class</span></a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../index.html?org/apache/edgent/oplet/plumbing/PressureReliever.html" target="_top">Frames</a></li> |
| <li><a href="PressureReliever.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_bottom"> |
| <li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_bottom"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li>Field | </li> |
| <li><a href="#constructor.summary">Constr</a> | </li> |
| <li><a href="#method.summary">Method</a></li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li><a href="#constructor.detail">Constr</a> | </li> |
| <li><a href="#method.detail">Method</a></li> |
| </ul> |
| </div> |
| <a name="skip.navbar.bottom"> |
| <!-- --> |
| </a></div> |
| <!-- ======== END OF BOTTOM NAVBAR ======= --> |
| <p class="legalCopy"><small>Copyright © 2016 The Apache Software Foundation. All Rights Reserved - 59dfbdf-20161024-0005</small></p> |
| </body> |
| </html> |