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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.heron.common.basics</a></div> |
| <h2 title="Class Communicator" class="title">Class Communicator<E></h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.heron.common.basics.Communicator<E></li> |
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| <pre>public class <span class="typeNameLabel">Communicator<E></span> |
| extends java.lang.Object</pre> |
| <div class="block">An soft bounded unblocking queue based on LinkedTransferQueue. |
| This queue will has a soft bound, which mean you could check the remainingCapacity() to decide |
| whether you could continuously offer items. However, the buffer underneath is an unbounded |
| LinkedTransferQueue, so you could still offer items even if remainingCapacity() <= 0. |
| <p> |
| We use an unbound queue since for every time user's bolt's executing or spout's emitting tuples, |
| it is possible that unbounded # of tuples could be generated. And we could not stop them since |
| the logic is inside their jars. So in order to avoid enqueue failure, we need an unbound queue. |
| <p> |
| However, in order to avoid GC issues and keep high performance, we would have a dynamical tuning |
| Queue's expected capacity, see updateExpectedAvailableCapacity() below.</div> |
| </li> |
| </ul> |
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| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <h3>Constructor Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">Communicator</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.heron.common.basics.WakeableLooper,org.apache.heron.common.basics.WakeableLooper)">Communicator</a></span>​(<a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> producer, |
| <a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> consumer)</code></th> |
| <td class="colLast"> |
| <div class="block">Constructor for Communicator</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <section> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <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="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#clear()">clear</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#drainTo(java.util.Collection)">drainTo</a></span>​(java.util.Collection<? super <a href="Communicator.html" title="type parameter in Communicator">E</a>> c)</code></th> |
| <td class="colLast"> |
| <div class="block">Removes all available elements from this queue and adds them to the given collection.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#drainTo(java.util.Collection,int)">drainTo</a></span>​(java.util.Collection<? super <a href="Communicator.html" title="type parameter in Communicator">E</a>> c, |
| int maxElements)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#expectMoreItems()">expectMoreItems</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#expectNoMoreItems()">expectNoMoreItems</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCapacity()">getCapacity</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getExpectedAvailableCapacity()">getExpectedAvailableCapacity</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#informConsumer()">informConsumer</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#informProducer()">informProducer</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#init(int,int,double)">init</a></span>​(int ipcapacity, |
| int ipexpectedQueueSize, |
| double ipcurrentSampleWeight)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isEmpty()">isEmpty</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#offer(E)">offer</a></span>​(<a href="Communicator.html" title="type parameter in Communicator">E</a> e)</code></th> |
| <td class="colLast"> |
| <div class="block">Since it is an unbounded queue, the offer will always return true.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code><a href="Communicator.html" title="type parameter in Communicator">E</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#peek()">peek</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code><a href="Communicator.html" title="type parameter in Communicator">E</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#poll()">poll</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Check if there is any item in the queue</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#remainingCapacity()">remainingCapacity</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setConsumer(org.apache.heron.common.basics.WakeableLooper)">setConsumer</a></span>​(<a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> consumer)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setProducer(org.apache.heron.common.basics.WakeableLooper)">setProducer</a></span>​(<a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> producer)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#size()">size</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Get the number of items in queue</div> |
| </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#updateExpectedAvailableCapacity()">updateExpectedAvailableCapacity</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="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> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h3>Constructor Detail</h3> |
| <a id="<init>(org.apache.heron.common.basics.WakeableLooper,org.apache.heron.common.basics.WakeableLooper)"> |
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| </a> |
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| <h4>Communicator</h4> |
| <pre>public Communicator​(<a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> producer, |
| <a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> consumer)</pre> |
| <div class="block">Constructor for Communicator</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>producer</code> - would be waken up when items are consumed from queue, |
| or set it to null if we don't want producer to be waken up</dd> |
| <dd><code>consumer</code> - would be waken up when items are produced into queue, |
| or set it to null if we don't want consumer to be waken up</dd> |
| </dl> |
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| <h4>Communicator</h4> |
| <pre>public Communicator()</pre> |
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| </a> |
| <h3>Method Detail</h3> |
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| <h4>setProducer</h4> |
| <pre class="methodSignature">public void setProducer​(<a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> producer)</pre> |
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| <h4>setConsumer</h4> |
| <pre class="methodSignature">public void setConsumer​(<a href="WakeableLooper.html" title="class in org.apache.heron.common.basics">WakeableLooper</a> consumer)</pre> |
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| <pre class="methodSignature">public void init​(int ipcapacity, |
| int ipexpectedQueueSize, |
| double ipcurrentSampleWeight)</pre> |
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| <pre class="methodSignature">public int size()</pre> |
| <div class="block">Get the number of items in queue</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of items in queue</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre class="methodSignature">public int remainingCapacity()</pre> |
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| <h4>poll</h4> |
| <pre class="methodSignature">public <a href="Communicator.html" title="type parameter in Communicator">E</a> poll()</pre> |
| <div class="block">Check if there is any item in the queue</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>null if there is no item inside the queue</dd> |
| </dl> |
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| <h4>offer</h4> |
| <pre class="methodSignature">public boolean offer​(<a href="Communicator.html" title="type parameter in Communicator">E</a> e)</pre> |
| <div class="block">Since it is an unbounded queue, the offer will always return true.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>e</code> - Item to be inserted</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true : inserted successfully</dd> |
| </dl> |
| </li> |
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| <pre class="methodSignature">public <a href="Communicator.html" title="type parameter in Communicator">E</a> peek()</pre> |
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| <pre class="methodSignature">public int getCapacity()</pre> |
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| <h4>clear</h4> |
| <pre class="methodSignature">public void clear()</pre> |
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| <pre class="methodSignature">public int drainTo​(java.util.Collection<? super <a href="Communicator.html" title="type parameter in Communicator">E</a>> c)</pre> |
| <div class="block">Removes all available elements from this queue and adds them to the given collection. |
| This operation may be more efficient than repeatedly polling this queue. |
| A failure encountered while attempting to add elements to collection c may result in elements being in neither, |
| either or both collections when the associated exception is thrown. Attempts to drain a queue to itself result in IllegalArgumentException. |
| Further, the behavior of this operation is undefined if the specified collection is modified while the operation is in progress.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of elements transferred</dd> |
| </dl> |
| </li> |
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| <h4>drainTo</h4> |
| <pre class="methodSignature">public int drainTo​(java.util.Collection<? super <a href="Communicator.html" title="type parameter in Communicator">E</a>> c, |
| int maxElements)</pre> |
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| <pre class="methodSignature">public void updateExpectedAvailableCapacity()</pre> |
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