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<div class="subTitle">edu.emory.mathcs.backport.java.util.concurrent</div>
<h2 title="Class LinkedBlockingQueue" class="title">Class LinkedBlockingQueue</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li>java.util.AbstractCollection</li>
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<li><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util">edu.emory.mathcs.backport.java.util.AbstractCollection</a></li>
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<ul class="inheritance">
<li><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html" title="class in edu.emory.mathcs.backport.java.util">edu.emory.mathcs.backport.java.util.AbstractQueue</a></li>
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<li>edu.emory.mathcs.backport.java.util.concurrent.LinkedBlockingQueue</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a>, java.io.Serializable, java.lang.Iterable, java.util.Collection</dd>
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<pre>public class <span class="strong">LinkedBlockingQueue</span>
extends <a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html" title="class in edu.emory.mathcs.backport.java.util">AbstractQueue</a>
implements <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a>, java.io.Serializable</pre>
<div class="block">An optionally-bounded <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">blocking queue</a> based on
linked nodes.
This queue orders elements FIFO (first-in-first-out).
The <em>head</em> of the queue is that element that has been on the
queue the longest time.
The <em>tail</em> of the queue is that element that has been on the
queue the shortest time. New elements
are inserted at the tail of the queue, and the queue retrieval
operations obtain elements at the head of the queue.
Linked queues typically have higher throughput than array-based queues but
less predictable performance in most concurrent applications.
<p> The optional capacity bound constructor argument serves as a
way to prevent excessive queue expansion. The capacity, if unspecified,
is equal to <code>Integer.MAX_VALUE</code>. Linked nodes are
dynamically created upon each insertion unless this would bring the
queue above capacity.
<p>This class and its iterator implement all of the
<em>optional</em> methods of the <code>Collection</code> and <code>Iterator</code> interfaces.
<p>This class is a member of the
<a href="../../../../../../../../technotes/guides/collections/index.html">
Java Collections Framework</a>.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Doug Lea</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../../serialized-form.html#edu.emory.mathcs.backport.java.util.concurrent.LinkedBlockingQueue">Serialized Form</a></dd></dl>
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<h3>Constructor Summary</h3>
<table class="overviewSummary" 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><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#LinkedBlockingQueue()">LinkedBlockingQueue</a></strong>()</code>
<div class="block">Creates a <tt>LinkedBlockingQueue</tt> with a capacity of
<code>Integer.MAX_VALUE</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#LinkedBlockingQueue(java.util.Collection)">LinkedBlockingQueue</a></strong>(java.util.Collection c)</code>
<div class="block">Creates a <tt>LinkedBlockingQueue</tt> with a capacity of
<code>Integer.MAX_VALUE</code>, initially containing the elements of the
given collection,
added in traversal order of the collection's iterator.</div>
</td>
</tr>
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<td class="colOne"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#LinkedBlockingQueue(int)">LinkedBlockingQueue</a></strong>(int capacity)</code>
<div class="block">Creates a <tt>LinkedBlockingQueue</tt> with the given (fixed) capacity.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#clear()">clear</a></strong>()</code>
<div class="block">Atomically removes all of the elements from this queue.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#drainTo(java.util.Collection)">drainTo</a></strong>(java.util.Collection c)</code>
<div class="block">Removes all available elements from this queue and adds them
to the given collection.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#drainTo(java.util.Collection, int)">drainTo</a></strong>(java.util.Collection 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 class="rowColor">
<td class="colFirst"><code>java.util.Iterator</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#iterator()">iterator</a></strong>()</code>
<div class="block">Returns an iterator over the elements in this queue in proper sequence.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#offer(java.lang.Object)">offer</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element at the tail of this queue if it is
possible to do so immediately without exceeding the queue's capacity,
returning <tt>true</tt> upon success and <tt>false</tt> if this queue
is full.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#offer(java.lang.Object, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">offer</a></strong>(java.lang.Object e,
long timeout,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Inserts the specified element at the tail of this queue, waiting if
necessary up to the specified wait time for space to become available.</div>
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<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#peek()">peek</a></strong>()</code>
<div class="block">Retrieves, but does not remove, the head of this queue,
or returns <tt>null</tt> if this queue is empty.</div>
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<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#poll()">poll</a></strong>()</code>
<div class="block">Retrieves and removes the head of this queue,
or returns <tt>null</tt> if this queue is empty.</div>
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<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#poll(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">poll</a></strong>(long timeout,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.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>
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<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#put(java.lang.Object)">put</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element at the tail of this queue, waiting if
necessary for space to become available.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#remainingCapacity()">remainingCapacity</a></strong>()</code>
<div class="block">Returns the number of additional elements that this queue can ideally
(in the absence of memory or resource constraints) accept without
blocking.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#remove(java.lang.Object)">remove</a></strong>(java.lang.Object o)</code>
<div class="block">Removes a single instance of the specified element from this queue,
if it is present.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#size()">size</a></strong>()</code>
<div class="block">Returns the number of elements in this queue.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#take()">take</a></strong>()</code>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
until an element becomes available.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#toArray()">toArray</a></strong>()</code>
<div class="block">Returns an array containing all of the elements in this queue, in
proper sequence.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#toArray(java.lang.Object[])">toArray</a></strong>(java.lang.Object[] a)</code>
<div class="block">Returns an array containing all of the elements in this queue, in
proper sequence; the runtime type of the returned array is that of
the specified array.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#toString()">toString</a></strong>()</code> </td>
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<code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#add(java.lang.Object)">add</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#addAll(java.util.Collection)">addAll</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#element()">element</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#remove()">remove</a></code></li>
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<code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#add(java.lang.Object)">add</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#contains(java.lang.Object)">contains</a></code></li>
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<h3>Methods inherited from interface edu.emory.mathcs.backport.java.util.<a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></h3>
<code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#element()">element</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#remove()">remove</a></code></li>
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<code>addAll, containsAll, equals, hashCode, isEmpty, removeAll, retainAll</code></li>
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<h4>LinkedBlockingQueue</h4>
<pre>public LinkedBlockingQueue()</pre>
<div class="block">Creates a <tt>LinkedBlockingQueue</tt> with a capacity of
<code>Integer.MAX_VALUE</code>.</div>
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<h4>LinkedBlockingQueue</h4>
<pre>public LinkedBlockingQueue(int capacity)</pre>
<div class="block">Creates a <tt>LinkedBlockingQueue</tt> with the given (fixed) capacity.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>capacity</code> - the capacity of this queue</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if <tt>capacity</tt> is not greater
than zero</dd></dl>
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<h4>LinkedBlockingQueue</h4>
<pre>public LinkedBlockingQueue(java.util.Collection c)</pre>
<div class="block">Creates a <tt>LinkedBlockingQueue</tt> with a capacity of
<code>Integer.MAX_VALUE</code>, initially containing the elements of the
given collection,
added in traversal order of the collection's iterator.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - the collection of elements to initially contain</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified collection or any
of its elements are null</dd></dl>
</li>
</ul>
</li>
</ul>
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<pre>public int size()</pre>
<div class="block">Returns the number of elements in this queue.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>size</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code>size</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the number of elements in this queue</dd></dl>
</li>
</ul>
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<pre>public int remainingCapacity()</pre>
<div class="block">Returns the number of additional elements that this queue can ideally
(in the absence of memory or resource constraints) accept without
blocking. This is always equal to the initial capacity of this queue
less the current <tt>size</tt> of this queue.
<p>Note that you <em>cannot</em> always tell if an attempt to insert
an element will succeed by inspecting <tt>remainingCapacity</tt>
because it may be the case that another thread is about to
insert or remove an element.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#remainingCapacity()">remainingCapacity</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the remaining capacity</dd></dl>
</li>
</ul>
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<h4>put</h4>
<pre>public void put(java.lang.Object e)
throws java.lang.InterruptedException</pre>
<div class="block">Inserts the specified element at the tail of this queue, waiting if
necessary for space to become available.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#put(java.lang.Object)">put</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>e</code> - the element to add</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if interrupted while waiting</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified element is null</dd></dl>
</li>
</ul>
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<h4>offer</h4>
<pre>public boolean offer(java.lang.Object e,
long timeout,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)
throws java.lang.InterruptedException</pre>
<div class="block">Inserts the specified element at the tail of this queue, waiting if
necessary up to the specified wait time for space to become available.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#offer(java.lang.Object, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">offer</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">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
<tt>unit</tt></dd><dd><code>unit</code> - a <tt>TimeUnit</tt> determining how to interpret the
<tt>timeout</tt> parameter</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if successful, or <tt>false</tt> if
the specified waiting time elapses before space is available.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if interrupted while waiting</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified element is null</dd></dl>
</li>
</ul>
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<pre>public boolean offer(java.lang.Object e)</pre>
<div class="block">Inserts the specified element at the tail of this queue if it is
possible to do so immediately without exceeding the queue's capacity,
returning <tt>true</tt> upon success and <tt>false</tt> if this queue
is full.
When using a capacity-restricted queue, this method is generally
preferable to method <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#add(java.lang.Object)"><code>add</code></a>, which can fail to
insert an element only by throwing an exception.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#offer(java.lang.Object)">offer</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#offer(java.lang.Object)">offer</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>e</code> - the element to add</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if the element was added to this queue, else
<tt>false</tt></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified element is null</dd></dl>
</li>
</ul>
<a name="take()">
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<h4>take</h4>
<pre>public java.lang.Object take()
throws java.lang.InterruptedException</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#take()">BlockingQueue</a></code></strong></div>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
until an element becomes available.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#take()">take</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the head of this queue</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if interrupted while waiting</dd></dl>
</li>
</ul>
<a name="poll(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<h4>poll</h4>
<pre>public java.lang.Object poll(long timeout,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)
throws java.lang.InterruptedException</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#poll(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">BlockingQueue</a></code></strong></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><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#poll(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">poll</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>timeout</code> - how long to wait before giving up, in units of
<tt>unit</tt></dd><dd><code>unit</code> - a <tt>TimeUnit</tt> determining how to interpret the
<tt>timeout</tt> parameter</dd>
<dt><span class="strong">Returns:</span></dt><dd>the head of this queue, or <tt>null</tt> if the
specified waiting time elapses before an element is available</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if interrupted while waiting</dd></dl>
</li>
</ul>
<a name="poll()">
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<h4>poll</h4>
<pre>public java.lang.Object poll()</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()">Queue</a></code></strong></div>
<div class="block">Retrieves and removes the head of this queue,
or returns <tt>null</tt> if this queue is empty.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#poll()">poll</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the head of this queue, or <tt>null</tt> if this queue is empty</dd></dl>
</li>
</ul>
<a name="peek()">
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<h4>peek</h4>
<pre>public java.lang.Object peek()</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#peek()">Queue</a></code></strong></div>
<div class="block">Retrieves, but does not remove, the head of this queue,
or returns <tt>null</tt> if this queue is empty.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html#peek()">peek</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/Queue.html" title="interface in edu.emory.mathcs.backport.java.util">Queue</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the head of this queue, or <tt>null</tt> if this queue is empty</dd></dl>
</li>
</ul>
<a name="remove(java.lang.Object)">
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<h4>remove</h4>
<pre>public boolean remove(java.lang.Object 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 <tt>e</tt> such
that <tt>o.equals(e)</tt>, if this queue contains one or more such
elements.
Returns <tt>true</tt> if this queue contained the specified element
(or equivalently, if this queue changed as a result of the call).</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#remove(java.lang.Object)">remove</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code>remove</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>remove</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>o</code> - element to be removed from this queue, if present</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if this queue changed as a result of the call</dd></dl>
</li>
</ul>
<a name="toArray()">
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<h4>toArray</h4>
<pre>public java.lang.Object[] toArray()</pre>
<div class="block">Returns an array containing all of the elements in this queue, in
proper sequence.
<p>The returned array will be "safe" in that no references to it are
maintained by this queue. (In other words, this method must allocate
a new array). The caller is thus free to modify the returned array.
<p>This method acts as bridge between array-based and collection-based
APIs.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>toArray</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html#toArray()">toArray</a></code> in class <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util">AbstractCollection</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>an array containing all of the elements in this queue</dd></dl>
</li>
</ul>
<a name="toArray(java.lang.Object[])">
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<ul class="blockList">
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<h4>toArray</h4>
<pre>public java.lang.Object[] toArray(java.lang.Object[] a)</pre>
<div class="block">Returns an array containing all of the elements in this queue, in
proper sequence; the runtime type of the returned array is that of
the specified array. If the queue fits in the specified array, it
is returned therein. Otherwise, a new array is allocated with the
runtime type of the specified array and the size of this queue.
<p>If this queue fits in the specified array with room to spare
(i.e., the array has more elements than this queue), the element in
the array immediately following the end of the queue is set to
<tt>null</tt>.
<p>Like the <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/LinkedBlockingQueue.html#toArray()"><code>toArray()</code></a> method, this method acts as bridge between
array-based and collection-based APIs. Further, this method allows
precise control over the runtime type of the output array, and may,
under certain circumstances, be used to save allocation costs.
<p>Suppose <tt>x</tt> is a queue known to contain only strings.
The following code can be used to dump the queue into a newly
allocated array of <tt>String</tt>:
<pre>
String[] y = x.toArray(new String[0]);</pre>
Note that <tt>toArray(new Object[0])</tt> is identical in function to
<tt>toArray()</tt>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>toArray</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html#toArray(java.lang.Object[])">toArray</a></code> in class <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractCollection.html" title="class in edu.emory.mathcs.backport.java.util">AbstractCollection</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>a</code> - the array into which the elements of the queue are to
be stored, if it is big enough; otherwise, a new array of the
same runtime type is allocated for this purpose</dd>
<dt><span class="strong">Returns:</span></dt><dd>an array containing all of the elements in this queue</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.ArrayStoreException</code> - if the runtime type of the specified array
is not a supertype of the runtime type of every element in
this queue</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified array is null</dd></dl>
</li>
</ul>
<a name="toString()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>toString</h4>
<pre>public java.lang.String toString()</pre>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>toString</code> in class <code>java.util.AbstractCollection</code></dd>
</dl>
</li>
</ul>
<a name="clear()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>clear</h4>
<pre>public void clear()</pre>
<div class="block">Atomically removes all of the elements from this queue.
The queue will be empty after this call returns.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>clear</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html#clear()">clear</a></code> in class <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/AbstractQueue.html" title="class in edu.emory.mathcs.backport.java.util">AbstractQueue</a></code></dd>
</dl>
</li>
</ul>
<a name="drainTo(java.util.Collection)">
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<ul class="blockList">
<li class="blockList">
<h4>drainTo</h4>
<pre>public int drainTo(java.util.Collection c)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#drainTo(java.util.Collection)">BlockingQueue</a></code></strong></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 <tt>c</tt> 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
<tt>IllegalArgumentException</tt>. Further, the behavior of
this operation is undefined if the specified collection is
modified while the operation is in progress.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#drainTo(java.util.Collection)">drainTo</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - the collection to transfer elements into</dd>
<dt><span class="strong">Returns:</span></dt><dd>the number of elements transferred</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if addition of elements
is not supported by the specified collection</dd>
<dd><code>java.lang.ClassCastException</code> - if the class of an element of this queue
prevents it from being added to the specified collection</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified collection is null</dd>
<dd><code>java.lang.IllegalArgumentException</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>
</li>
</ul>
<a name="drainTo(java.util.Collection, int)">
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<ul class="blockList">
<li class="blockList">
<h4>drainTo</h4>
<pre>public int drainTo(java.util.Collection c,
int maxElements)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#drainTo(java.util.Collection, int)">BlockingQueue</a></code></strong></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 <tt>c</tt> 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
<tt>IllegalArgumentException</tt>. Further, the behavior of
this operation is undefined if the specified collection is
modified while the operation is in progress.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#drainTo(java.util.Collection, int)">drainTo</a></code> in interface <code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">BlockingQueue</a></code></dd>
<dt><span class="strong">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="strong">Returns:</span></dt><dd>the number of elements transferred</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if addition of elements
is not supported by the specified collection</dd>
<dd><code>java.lang.ClassCastException</code> - if the class of an element of this queue
prevents it from being added to the specified collection</dd>
<dd><code>java.lang.NullPointerException</code> - if the specified collection is null</dd>
<dd><code>java.lang.IllegalArgumentException</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>
</li>
</ul>
<a name="iterator()">
<!-- -->
</a>
<ul class="blockListLast">
<li class="blockList">
<h4>iterator</h4>
<pre>public java.util.Iterator iterator()</pre>
<div class="block">Returns an iterator over the elements in this queue in proper sequence.
The returned <tt>Iterator</tt> is a "weakly consistent" iterator that
will never throw <code>ConcurrentModificationException</code>,
and guarantees to traverse elements as they existed upon
construction of the iterator, and may (but is not guaranteed to)
reflect any modifications subsequent to construction.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>iterator</code> in interface <code>java.lang.Iterable</code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code>iterator</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code>iterator</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>an iterator over the elements in this queue in proper sequence</dd></dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
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