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LinkedTransferQueue.html
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<title>LinkedTransferQueue (Java Platform SE 8 )</title>
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<meta name="keywords" content="java.util.concurrent.LinkedTransferQueue class">
<meta name="keywords" content="spliterator()">
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<div class="subTitle">java.util.concurrent</div>
<h2 title="Class LinkedTransferQueue" class="title">Class LinkedTransferQueue<E></h2>
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<li>java.util.concurrent.LinkedTransferQueue<E></li>
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<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>E</code> - the type of elements held in this collection</dd>
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<dd><a href="../../../java/io/Serializable.html" title="interface in java.io">Serializable</a>, <a href="../../../java/lang/Iterable.html" title="interface in java.lang">Iterable</a><E>, <a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><E>, <a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><E>, <a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><E>, <a href="../../../java/util/Queue.html" title="interface in java.util">Queue</a><E></dd>
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<pre>public class <span class="typeNameLabel">LinkedTransferQueue<E></span>
extends <a href="../../../java/util/AbstractQueue.html" title="class in java.util">AbstractQueue</a><E>
implements <a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><E>, <a href="../../../java/io/Serializable.html" title="interface in java.io">Serializable</a></pre>
<div class="block">An unbounded <a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent"><code>TransferQueue</code></a> based on linked nodes.
This queue orders elements FIFO (first-in-first-out) with respect
to any given producer. The <em>head</em> of the queue is that
element that has been on the queue the longest time for some
producer. The <em>tail</em> of the queue is that element that has
been on the queue the shortest time for some producer.
<p>Beware that, unlike in most collections, the <code>size</code> method
is <em>NOT</em> a constant-time operation. Because of the
asynchronous nature of these queues, determining the current number
of elements requires a traversal of the elements, and so may report
inaccurate results if this collection is modified during traversal.
Additionally, the bulk operations <code>addAll</code>,
<code>removeAll</code>, <code>retainAll</code>, <code>containsAll</code>,
<code>equals</code>, and <code>toArray</code> are <em>not</em> guaranteed
to be performed atomically. For example, an iterator operating
concurrently with an <code>addAll</code> operation might view only some
of the added elements.
<p>This class and its iterator implement all of the
<em>optional</em> methods of the <a href="../../../java/util/Collection.html" title="interface in java.util"><code>Collection</code></a> and <a href="../../../java/util/Iterator.html" title="interface in java.util"><code>Iterator</code></a> interfaces.
<p>Memory consistency effects: As with other concurrent
collections, actions in a thread prior to placing an object into a
<code>LinkedTransferQueue</code>
<a href="package-summary.html#MemoryVisibility"><i>happen-before</i></a>
actions subsequent to the access or removal of that element from
the <code>LinkedTransferQueue</code> in another thread.
<p>This class is a member of the
<a href="../../../../technotes/guides/collections/index.html">
Java Collections Framework</a>.</div>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.7</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../serialized-form.html#java.util.concurrent.LinkedTransferQueue">Serialized Form</a></dd>
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<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="../../../java/util/concurrent/LinkedTransferQueue.html#LinkedTransferQueue--">LinkedTransferQueue</a></span>()</code>
<div class="block">Creates an initially empty <code>LinkedTransferQueue</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#LinkedTransferQueue-java.util.Collection-">LinkedTransferQueue</a></span>(<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><? extends <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> c)</code>
<div class="block">Creates a <code>LinkedTransferQueue</code>
initially containing the elements of the given collection,
added in traversal order of the collection's iterator.</div>
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<h3>Method Summary</h3>
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<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>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#add-E-">add</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</code>
<div class="block">Inserts the specified element at the tail of this queue.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#contains-java.lang.Object-">contains</a></span>(<a href="../../../java/lang/Object.html" title="class in java.lang">Object</a> o)</code>
<div class="block">Returns <code>true</code> if this queue contains the specified element.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#drainTo-java.util.Collection-">drainTo</a></span>(<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><? super <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> c)</code>
<div class="block">Removes all available elements from this queue and adds them
to the given collection.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#drainTo-java.util.Collection-int-">drainTo</a></span>(<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><? super <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> c,
int maxElements)</code>
<div class="block">Removes at most the given number of available elements from
this queue and adds them to the given collection.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#getWaitingConsumerCount--">getWaitingConsumerCount</a></span>()</code>
<div class="block">Returns an estimate of the number of consumers waiting to
receive elements via <a href="../../../java/util/concurrent/BlockingQueue.html#take--"><code>BlockingQueue.take()</code></a> or timed
<a href="../../../java/util/concurrent/BlockingQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#hasWaitingConsumer--">hasWaitingConsumer</a></span>()</code>
<div class="block">Returns <code>true</code> if there is at least one consumer waiting
to receive an element via <a href="../../../java/util/concurrent/BlockingQueue.html#take--"><code>BlockingQueue.take()</code></a> or
timed <a href="../../../java/util/concurrent/BlockingQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#isEmpty--">isEmpty</a></span>()</code>
<div class="block">Returns <code>true</code> if this queue contains no elements.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../java/util/Iterator.html" title="interface in java.util">Iterator</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#iterator--">iterator</a></span>()</code>
<div class="block">Returns an iterator over the elements in this queue in proper sequence.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#offer-E-">offer</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</code>
<div class="block">Inserts the specified element at the tail of this queue.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#offer-E-long-java.util.concurrent.TimeUnit-">offer</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e,
long timeout,
<a href="../../../java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Inserts the specified element at the tail of this queue.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#peek--">peek</a></span>()</code>
<div class="block">Retrieves, but does not remove, the head of this queue,
or returns <code>null</code> if this queue is empty.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#poll--">poll</a></span>()</code>
<div class="block">Retrieves and removes the head of this queue,
or returns <code>null</code> if this queue is empty.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#poll-long-java.util.concurrent.TimeUnit-">poll</a></span>(long timeout,
<a href="../../../java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Retrieves and removes the head of this queue, waiting up to the
specified wait time if necessary for an element to become available.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#put-E-">put</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</code>
<div class="block">Inserts the specified element at the tail of this queue.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#remainingCapacity--">remainingCapacity</a></span>()</code>
<div class="block">Always returns <code>Integer.MAX_VALUE</code> because a
<code>LinkedTransferQueue</code> is not capacity constrained.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#remove-java.lang.Object-">remove</a></span>(<a href="../../../java/lang/Object.html" title="class in java.lang">Object</a> o)</code>
<div class="block">Removes a single instance of the specified element from this queue,
if it is present.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#size--">size</a></span>()</code>
<div class="block">Returns the number of elements in this queue.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../java/util/Spliterator.html" title="interface in java.util">Spliterator</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#spliterator--">spliterator</a></span>()</code>
<div class="block">Returns a <a href="../../../java/util/Spliterator.html" title="interface in java.util"><code>Spliterator</code></a> over the elements in this queue.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#take--">take</a></span>()</code>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
until an element becomes available.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#transfer-E-">transfer</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</code>
<div class="block">Transfers the element to a consumer, waiting if necessary to do so.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#tryTransfer-E-">tryTransfer</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</code>
<div class="block">Transfers the element to a waiting consumer immediately, if possible.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../java/util/concurrent/LinkedTransferQueue.html#tryTransfer-E-long-java.util.concurrent.TimeUnit-">tryTransfer</a></span>(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e,
long timeout,
<a href="../../../java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Transfers the element to a consumer if it is possible to do so
before the timeout elapses.</div>
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<h3>Methods inherited from class java.util.<a href="../../../java/util/AbstractQueue.html" title="class in java.util">AbstractQueue</a></h3>
<code><a href="../../../java/util/AbstractQueue.html#addAll-java.util.Collection-">addAll</a>, <a href="../../../java/util/AbstractQueue.html#clear--">clear</a>, <a href="../../../java/util/AbstractQueue.html#element--">element</a>, <a href="../../../java/util/AbstractQueue.html#remove--">remove</a></code></li>
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<code><a href="../../../java/util/AbstractCollection.html#containsAll-java.util.Collection-">containsAll</a>, <a href="../../../java/util/AbstractCollection.html#removeAll-java.util.Collection-">removeAll</a>, <a href="../../../java/util/AbstractCollection.html#retainAll-java.util.Collection-">retainAll</a>, <a href="../../../java/util/AbstractCollection.html#toArray--">toArray</a>, <a href="../../../java/util/AbstractCollection.html#toArray-T:A-">toArray</a>, <a href="../../../java/util/AbstractCollection.html#toString--">toString</a></code></li>
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<code><a href="../../../java/lang/Object.html#clone--">clone</a>, <a href="../../../java/lang/Object.html#equals-java.lang.Object-">equals</a>, <a href="../../../java/lang/Object.html#finalize--">finalize</a>, <a href="../../../java/lang/Object.html#getClass--">getClass</a>, <a href="../../../java/lang/Object.html#hashCode--">hashCode</a>, <a href="../../../java/lang/Object.html#notify--">notify</a>, <a href="../../../java/lang/Object.html#notifyAll--">notifyAll</a>, <a href="../../../java/lang/Object.html#wait--">wait</a>, <a href="../../../java/lang/Object.html#wait-long-">wait</a>, <a href="../../../java/lang/Object.html#wait-long-int-">wait</a></code></li>
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<h3>Methods inherited from interface java.util.<a href="../../../java/util/Queue.html" title="interface in java.util">Queue</a></h3>
<code><a href="../../../java/util/Queue.html#element--">element</a>, <a href="../../../java/util/Queue.html#remove--">remove</a></code></li>
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<h3>Methods inherited from interface java.util.<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a></h3>
<code><a href="../../../java/util/Collection.html#addAll-java.util.Collection-">addAll</a>, <a href="../../../java/util/Collection.html#clear--">clear</a>, <a href="../../../java/util/Collection.html#containsAll-java.util.Collection-">containsAll</a>, <a href="../../../java/util/Collection.html#equals-java.lang.Object-">equals</a>, <a href="../../../java/util/Collection.html#hashCode--">hashCode</a>, <a href="../../../java/util/Collection.html#parallelStream--">parallelStream</a>, <a href="../../../java/util/Collection.html#removeAll-java.util.Collection-">removeAll</a>, <a href="../../../java/util/Collection.html#removeIf-java.util.function.Predicate-">removeIf</a>, <a href="../../../java/util/Collection.html#retainAll-java.util.Collection-">retainAll</a>, <a href="../../../java/util/Collection.html#stream--">stream</a>, <a href="../../../java/util/Collection.html#toArray--">toArray</a>, <a href="../../../java/util/Collection.html#toArray-T:A-">toArray</a></code></li>
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<h3>Methods inherited from interface java.lang.<a href="../../../java/lang/Iterable.html" title="interface in java.lang">Iterable</a></h3>
<code><a href="../../../java/lang/Iterable.html#forEach-java.util.function.Consumer-">forEach</a></code></li>
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<h4>LinkedTransferQueue</h4>
<pre>public LinkedTransferQueue()</pre>
<div class="block">Creates an initially empty <code>LinkedTransferQueue</code>.</div>
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<h4>LinkedTransferQueue</h4>
<pre>public LinkedTransferQueue(<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><? extends <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> c)</pre>
<div class="block">Creates a <code>LinkedTransferQueue</code>
initially containing the elements of the given collection,
added in traversal order of the collection's iterator.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - the collection of elements to initially contain</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified collection or any
of its elements are null</dd>
</dl>
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<h4>spliterator</h4>
<pre>public <a href="../../../java/util/Spliterator.html" title="interface in java.util">Spliterator</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> spliterator()</pre>
<div class="block">Returns a <a href="../../../java/util/Spliterator.html" title="interface in java.util"><code>Spliterator</code></a> over the elements in this queue.
<p>The returned spliterator is
<a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.
<p>The <code>Spliterator</code> reports <a href="../../../java/util/Spliterator.html#CONCURRENT"><code>Spliterator.CONCURRENT</code></a>,
<a href="../../../java/util/Spliterator.html#ORDERED"><code>Spliterator.ORDERED</code></a>, and <a href="../../../java/util/Spliterator.html#NONNULL"><code>Spliterator.NONNULL</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/lang/Iterable.html#spliterator--">spliterator</a></code> in interface <code><a href="../../../java/lang/Iterable.html" title="interface in java.lang">Iterable</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Collection.html#spliterator--">spliterator</a></code> in interface <code><a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="simpleTagLabel">Implementation Note:</span></dt>
<dd>The <code>Spliterator</code> implements <code>trySplit</code> to permit limited
parallelism.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>Spliterator</code> over the elements in this queue</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.8</dd>
</dl>
</li>
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<h4>put</h4>
<pre>public void put(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</pre>
<div class="block">Inserts the specified element at the tail of this queue.
As the queue is unbounded, this method will never block.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#put-E-">put</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to add</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
</dl>
</li>
</ul>
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<h4>offer</h4>
<pre>public boolean offer(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e,
long timeout,
<a href="../../../java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent">TimeUnit</a> unit)</pre>
<div class="block">Inserts the specified element at the tail of this queue.
As the queue is unbounded, this method will never block or
return <code>false</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#offer-E-long-java.util.concurrent.TimeUnit-">offer</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to add</dd>
<dd><code>timeout</code> - how long to wait before giving up, in units of
<code>unit</code></dd>
<dd><code>unit</code> - a <code>TimeUnit</code> determining how to interpret the
<code>timeout</code> parameter</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> (as specified by
<a href="../../../java/util/concurrent/BlockingQueue.html#offer-E-long-java.util.concurrent.TimeUnit-"><code>BlockingQueue.offer</code></a>)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
</dl>
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<pre>public boolean offer(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</pre>
<div class="block">Inserts the specified element at the tail of this queue.
As the queue is unbounded, this method will never return <code>false</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#offer-E-">offer</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Queue.html#offer-E-">offer</a></code> in interface <code><a href="../../../java/util/Queue.html" title="interface in java.util">Queue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to add</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> (as specified by <a href="../../../java/util/Queue.html#offer-E-"><code>Queue.offer(E)</code></a>)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
</dl>
</li>
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<h4>add</h4>
<pre>public boolean add(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</pre>
<div class="block">Inserts the specified element at the tail of this queue.
As the queue is unbounded, this method will never throw
<a href="../../../java/lang/IllegalStateException.html" title="class in java.lang"><code>IllegalStateException</code></a> or return <code>false</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Collection.html#add-E-">add</a></code> in interface <code><a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#add-E-">add</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Queue.html#add-E-">add</a></code> in interface <code><a href="../../../java/util/Queue.html" title="interface in java.util">Queue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../java/util/AbstractQueue.html#add-E-">add</a></code> in class <code><a href="../../../java/util/AbstractQueue.html" title="class in java.util">AbstractQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to add</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> (as specified by <a href="../../../java/util/Collection.html#add-E-"><code>Collection.add(E)</code></a>)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
</dl>
</li>
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<pre>public boolean tryTransfer(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)</pre>
<div class="block">Transfers the element to a waiting consumer immediately, if possible.
<p>More precisely, transfers the specified element immediately
if there exists a consumer already waiting to receive it (in
<a href="../../../java/util/concurrent/LinkedTransferQueue.html#take--"><code>take()</code></a> or timed <a href="../../../java/util/concurrent/LinkedTransferQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>),
otherwise returning <code>false</code> without enqueuing the element.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/TransferQueue.html#tryTransfer-E-">tryTransfer</a></code> in interface <code><a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to transfer</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the element was transferred, else
<code>false</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
</dl>
</li>
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<pre>public void transfer(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e)
throws <a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></pre>
<div class="block">Transfers the element to a consumer, waiting if necessary to do so.
<p>More precisely, transfers the specified element immediately
if there exists a consumer already waiting to receive it (in
<a href="../../../java/util/concurrent/LinkedTransferQueue.html#take--"><code>take()</code></a> or timed <a href="../../../java/util/concurrent/LinkedTransferQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>),
else inserts the specified element at the tail of this queue
and waits until the element is received by a consumer.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/TransferQueue.html#transfer-E-">transfer</a></code> in interface <code><a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to transfer</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
<dd><code><a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></code> - if interrupted while waiting,
in which case the element is not left enqueued</dd>
</dl>
</li>
</ul>
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<pre>public boolean tryTransfer(<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> e,
long timeout,
<a href="../../../java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent">TimeUnit</a> unit)
throws <a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></pre>
<div class="block">Transfers the element to a consumer if it is possible to do so
before the timeout elapses.
<p>More precisely, transfers the specified element immediately
if there exists a consumer already waiting to receive it (in
<a href="../../../java/util/concurrent/LinkedTransferQueue.html#take--"><code>take()</code></a> or timed <a href="../../../java/util/concurrent/LinkedTransferQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>),
else inserts the specified element at the tail of this queue
and waits until the element is received by a consumer,
returning <code>false</code> if the specified wait time elapses
before the element can be transferred.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/TransferQueue.html#tryTransfer-E-long-java.util.concurrent.TimeUnit-">tryTransfer</a></code> in interface <code><a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - the element to transfer</dd>
<dd><code>timeout</code> - how long to wait before giving up, in units of
<code>unit</code></dd>
<dd><code>unit</code> - a <code>TimeUnit</code> determining how to interpret the
<code>timeout</code> parameter</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if successful, or <code>false</code> if
the specified waiting time elapses before completion,
in which case the element is not left enqueued</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified element is null</dd>
<dd><code><a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></code> - if interrupted while waiting,
in which case the element is not left enqueued</dd>
</dl>
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<h4>take</h4>
<pre>public <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> take()
throws <a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/concurrent/BlockingQueue.html#take--">BlockingQueue</a></code></span></div>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
until an element becomes available.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#take--">take</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the head of this queue</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></code> - if interrupted while waiting</dd>
</dl>
</li>
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<h4>poll</h4>
<pre>public <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> poll(long timeout,
<a href="../../../java/util/concurrent/TimeUnit.html" title="enum in java.util.concurrent">TimeUnit</a> unit)
throws <a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/concurrent/BlockingQueue.html#poll-long-java.util.concurrent.TimeUnit-">BlockingQueue</a></code></span></div>
<div class="block">Retrieves and removes the head of this queue, waiting up to the
specified wait time if necessary for an element to become available.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#poll-long-java.util.concurrent.TimeUnit-">poll</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>timeout</code> - how long to wait before giving up, in units of
<code>unit</code></dd>
<dd><code>unit</code> - a <code>TimeUnit</code> determining how to interpret the
<code>timeout</code> parameter</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the head of this queue, or <code>null</code> if the
specified waiting time elapses before an element is available</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/InterruptedException.html" title="class in java.lang">InterruptedException</a></code> - if interrupted while waiting</dd>
</dl>
</li>
</ul>
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<pre>public <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> poll()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/Queue.html#poll--">Queue</a></code></span></div>
<div class="block">Retrieves and removes the head of this queue,
or returns <code>null</code> if this queue is empty.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Queue.html#poll--">poll</a></code> in interface <code><a href="../../../java/util/Queue.html" title="interface in java.util">Queue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the head of this queue, or <code>null</code> if this queue is empty</dd>
</dl>
</li>
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<pre>public int drainTo(<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><? super <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> c)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/concurrent/BlockingQueue.html#drainTo-java.util.Collection-">BlockingQueue</a></code></span></div>
<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 <code>c</code> 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
<code>IllegalArgumentException</code>. 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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#drainTo-java.util.Collection-">drainTo</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - the collection to transfer elements into</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of elements transferred</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified collection is null</dd>
<dd><code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - if the specified collection is this
queue, or some property of an element of this queue prevents
it from being added to the specified collection</dd>
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<pre>public int drainTo(<a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><? super <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> c,
int maxElements)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/concurrent/BlockingQueue.html#drainTo-java.util.Collection-int-">BlockingQueue</a></code></span></div>
<div class="block">Removes at most the given number of available elements from
this queue and adds them to the given collection. A failure
encountered while attempting to add elements to
collection <code>c</code> 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
<code>IllegalArgumentException</code>. 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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#drainTo-java.util.Collection-int-">drainTo</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - the collection to transfer elements into</dd>
<dd><code>maxElements</code> - the maximum number of elements to transfer</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of elements transferred</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</a></code> - if the specified collection is null</dd>
<dd><code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - if the specified collection is this
queue, or some property of an element of this queue prevents
it from being added to the specified collection</dd>
</dl>
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<h4>iterator</h4>
<pre>public <a href="../../../java/util/Iterator.html" title="interface in java.util">Iterator</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>> iterator()</pre>
<div class="block">Returns an iterator over the elements in this queue in proper sequence.
The elements will be returned in order from first (head) to last (tail).
<p>The returned iterator is
<a href="package-summary.html#Weakly"><i>weakly consistent</i></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/lang/Iterable.html#iterator--">iterator</a></code> in interface <code><a href="../../../java/lang/Iterable.html" title="interface in java.lang">Iterable</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Collection.html#iterator--">iterator</a></code> in interface <code><a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/AbstractCollection.html#iterator--">iterator</a></code> in class <code><a href="../../../java/util/AbstractCollection.html" title="class in java.util">AbstractCollection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an iterator over the elements in this queue in proper sequence</dd>
</dl>
</li>
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<pre>public <a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a> peek()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/Queue.html#peek--">Queue</a></code></span></div>
<div class="block">Retrieves, but does not remove, the head of this queue,
or returns <code>null</code> if this queue is empty.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Queue.html#peek--">peek</a></code> in interface <code><a href="../../../java/util/Queue.html" title="interface in java.util">Queue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the head of this queue, or <code>null</code> if this queue is empty</dd>
</dl>
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<pre>public boolean isEmpty()</pre>
<div class="block">Returns <code>true</code> if this queue contains no elements.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Collection.html#isEmpty--">isEmpty</a></code> in interface <code><a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../java/util/AbstractCollection.html#isEmpty--">isEmpty</a></code> in class <code><a href="../../../java/util/AbstractCollection.html" title="class in java.util">AbstractCollection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if this queue contains no elements</dd>
</dl>
</li>
</ul>
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<h4>hasWaitingConsumer</h4>
<pre>public boolean hasWaitingConsumer()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/concurrent/TransferQueue.html#hasWaitingConsumer--">TransferQueue</a></code></span></div>
<div class="block">Returns <code>true</code> if there is at least one consumer waiting
to receive an element via <a href="../../../java/util/concurrent/BlockingQueue.html#take--"><code>BlockingQueue.take()</code></a> or
timed <a href="../../../java/util/concurrent/BlockingQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>.
The return value represents a momentary state of affairs.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/TransferQueue.html#hasWaitingConsumer--">hasWaitingConsumer</a></code> in interface <code><a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if there is at least one waiting consumer</dd>
</dl>
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<h4>size</h4>
<pre>public int size()</pre>
<div class="block">Returns the number of elements in this queue. If this queue
contains more than <code>Integer.MAX_VALUE</code> elements, returns
<code>Integer.MAX_VALUE</code>.
<p>Beware that, unlike in most collections, this method is
<em>NOT</em> a constant-time operation. Because of the
asynchronous nature of these queues, determining the current
number of elements requires an O(n) traversal.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Collection.html#size--">size</a></code> in interface <code><a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/AbstractCollection.html#size--">size</a></code> in class <code><a href="../../../java/util/AbstractCollection.html" title="class in java.util">AbstractCollection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of elements in this queue</dd>
</dl>
</li>
</ul>
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<h4>getWaitingConsumerCount</h4>
<pre>public int getWaitingConsumerCount()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../java/util/concurrent/TransferQueue.html#getWaitingConsumerCount--">TransferQueue</a></code></span></div>
<div class="block">Returns an estimate of the number of consumers waiting to
receive elements via <a href="../../../java/util/concurrent/BlockingQueue.html#take--"><code>BlockingQueue.take()</code></a> or timed
<a href="../../../java/util/concurrent/BlockingQueue.html#poll-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>. The return value is an
approximation of a momentary state of affairs, that may be
inaccurate if consumers have completed or given up waiting.
The value may be useful for monitoring and heuristics, but
not for synchronization control. Implementations of this
method are likely to be noticeably slower than those for
<a href="../../../java/util/concurrent/TransferQueue.html#hasWaitingConsumer--"><code>TransferQueue.hasWaitingConsumer()</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/TransferQueue.html#getWaitingConsumerCount--">getWaitingConsumerCount</a></code> in interface <code><a href="../../../java/util/concurrent/TransferQueue.html" title="interface in java.util.concurrent">TransferQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of consumers waiting to receive elements</dd>
</dl>
</li>
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<h4>remove</h4>
<pre>public boolean remove(<a href="../../../java/lang/Object.html" title="class in java.lang">Object</a> o)</pre>
<div class="block">Removes a single instance of the specified element from this queue,
if it is present. More formally, removes an element <code>e</code> such
that <code>o.equals(e)</code>, if this queue contains one or more such
elements.
Returns <code>true</code> if this queue contained the specified element
(or equivalently, if this queue changed as a result of the call).</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/Collection.html#remove-java.lang.Object-">remove</a></code> in interface <code><a href="../../../java/util/Collection.html" title="interface in java.util">Collection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../java/util/concurrent/BlockingQueue.html#remove-java.lang.Object-">remove</a></code> in interface <code><a href="../../../java/util/concurrent/BlockingQueue.html" title="interface in java.util.concurrent">BlockingQueue</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../java/util/AbstractCollection.html#remove-java.lang.Object-">remove</a></code> in class <code><a href="../../../java/util/AbstractCollection.html" title="class in java.util">AbstractCollection</a><<a href="../../../java/util/concurrent/LinkedTransferQueue.html" title="type parameter in LinkedTransferQueue">E</a>></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>