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<div class="subTitle">edu.emory.mathcs.backport.java.util.concurrent</div>
<h2 title="Class DelayQueue" class="title">Class DelayQueue</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>java.util.AbstractCollection</li>
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<ul class="inheritance">
<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>
<li>
<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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<ul class="inheritance">
<li>edu.emory.mathcs.backport.java.util.concurrent.DelayQueue</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.lang.Iterable, java.util.Collection</dd>
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<pre>public class <span class="strong">DelayQueue</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></pre>
<div class="block">An unbounded <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">blocking queue</a> of
<tt>Delayed</tt> elements, in which an element can only be taken
when its delay has expired. The <em>head</em> of the queue is that
<tt>Delayed</tt> element whose delay expired furthest in the
past. If no delay has expired there is no head and <tt>poll</tt>
will return <tt>null</tt>. Expiration occurs when an element's
<tt>getDelay(TimeUnit.NANOSECONDS)</tt> method returns a value less
than or equal to zero. Even though unexpired elements cannot be
removed using <tt>take</tt> or <tt>poll</tt>, they are otherwise
treated as normal elements. For example, the <tt>size</tt> method
returns the count of both expired and unexpired elements.
This queue does not permit null elements.
<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></dl>
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<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/DelayQueue.html#DelayQueue()">DelayQueue</a></strong>()</code>
<div class="block">Creates a new <tt>DelayQueue</tt> that is initially empty.</div>
</td>
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<td class="colOne"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html#DelayQueue(java.util.Collection)">DelayQueue</a></strong>(java.util.Collection c)</code>
<div class="block">Creates a <tt>DelayQueue</tt> initially containing the elements of the
given collection of <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Delayed.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Delayed</code></a> instances.</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>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html#add(java.lang.Object)">add</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element into this delay queue.</div>
</td>
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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/DelayQueue.html#clear()">clear</a></strong>()</code>
<div class="block">Atomically removes all of the elements from this delay 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/DelayQueue.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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<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.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>
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</tr>
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<td class="colFirst"><code>java.util.Iterator</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html#iterator()">iterator</a></strong>()</code>
<div class="block">Returns an iterator over all the elements (both expired and
unexpired) in this queue.</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/DelayQueue.html#offer(java.lang.Object)">offer</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element into this delay queue.</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/DelayQueue.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 into this delay queue.</div>
</td>
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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/DelayQueue.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="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.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 has no elements with an expired delay.</div>
</td>
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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/DelayQueue.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 if necessary
until an element with an expired delay is available on this queue,
or the specified wait time expires.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html#put(java.lang.Object)">put</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element into this delay queue.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html#remainingCapacity()">remainingCapacity</a></strong>()</code>
<div class="block">Always returns <tt>Integer.MAX_VALUE</tt> because
a <tt>DelayQueue</tt> is not capacity constrained.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.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, whether or not it has expired.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/DelayQueue.html#size()">size</a></strong>()</code> </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/DelayQueue.html#take()">take</a></strong>()</code>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
until an element with an expired delay is available on 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/DelayQueue.html#toArray()">toArray</a></strong>()</code>
<div class="block">Returns an array containing all of the elements in this queue.</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/DelayQueue.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; the
runtime type of the returned array is that of the specified array.</div>
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<code><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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<h3>Methods inherited from class java.util.AbstractCollection</h3>
<code>contains, containsAll, isEmpty, removeAll, retainAll, toString</code></li>
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<code><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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<h3>Methods inherited from interface java.util.Collection</h3>
<code>addAll, containsAll, equals, hashCode, isEmpty, removeAll, retainAll</code></li>
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<h4>DelayQueue</h4>
<pre>public DelayQueue()</pre>
<div class="block">Creates a new <tt>DelayQueue</tt> that is initially empty.</div>
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<h4>DelayQueue</h4>
<pre>public DelayQueue(java.util.Collection c)</pre>
<div class="block">Creates a <tt>DelayQueue</tt> initially containing the elements of the
given collection of <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Delayed.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Delayed</code></a> instances.</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>
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<h4>add</h4>
<pre>public boolean add(java.lang.Object e)</pre>
<div class="block">Inserts the specified element into this delay queue.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#add(java.lang.Object)">add</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#add(java.lang.Object)">add</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><strong>Specified by:</strong></dt>
<dd><code>add</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#add(java.lang.Object)">add</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>
<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> (as specified by <code>Collection.add(java.lang.Object)</code>)</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="offer(java.lang.Object)">
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<h4>offer</h4>
<pre>public boolean offer(java.lang.Object e)</pre>
<div class="block">Inserts the specified element into this delay queue.</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></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="put(java.lang.Object)">
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<h4>put</h4>
<pre>public void put(java.lang.Object e)</pre>
<div class="block">Inserts the specified element into this delay queue. As the queue is
unbounded this method will never block.</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.NullPointerException</code> - if the specified element is null</dd></dl>
</li>
</ul>
<a name="offer(java.lang.Object, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<ul class="blockList">
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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)</pre>
<div class="block">Inserts the specified element into this delay queue. As the queue is
unbounded this method will never block.</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> - This parameter is ignored as the method never blocks</dd><dd><code>unit</code> - This parameter is ignored as the method never blocks</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</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="poll()">
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<ul class="blockList">
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<h4>poll</h4>
<pre>public java.lang.Object poll()</pre>
<div class="block">Retrieves and removes the head of this queue, or returns <tt>null</tt>
if this queue has no elements with an expired delay.</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 has no elements with an expired delay</dd></dl>
</li>
</ul>
<a name="take()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>take</h4>
<pre>public java.lang.Object take()
throws java.lang.InterruptedException</pre>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
until an element with an expired delay is available on this queue.</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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</a>
<ul class="blockList">
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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">Retrieves and removes the head of this queue, waiting if necessary
until an element with an expired delay is available on this queue,
or the specified wait time expires.</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 with
an expired delay becomes 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="peek()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>peek</h4>
<pre>public java.lang.Object peek()</pre>
<div class="block">Retrieves, but does not remove, the head of this queue, or
returns <tt>null</tt> if this queue is empty. Unlike
<tt>poll</tt>, if no expired elements are available in the queue,
this method returns the element that will expire next,
if one exists.</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="size()">
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<ul class="blockList">
<li class="blockList">
<h4>size</h4>
<pre>public int size()</pre>
<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>
</dl>
</li>
</ul>
<a name="drainTo(java.util.Collection)">
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<ul class="blockList">
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<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="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 delay queue.
The queue will be empty after this call returns.
Elements with an unexpired delay are not waited for; they are
simply discarded from the queue.</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="remainingCapacity()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>remainingCapacity</h4>
<pre>public int remainingCapacity()</pre>
<div class="block">Always returns <tt>Integer.MAX_VALUE</tt> because
a <tt>DelayQueue</tt> is not capacity constrained.</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><tt>Integer.MAX_VALUE</tt></dd></dl>
</li>
</ul>
<a name="toArray()">
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<ul class="blockList">
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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.
The returned array elements are in no particular order.
<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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</a>
<ul class="blockList">
<li class="blockList">
<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; the
runtime type of the returned array is that of the specified array.
The returned array elements are in no particular order.
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/DelayQueue.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>The following code can be used to dump a delay queue into a newly
allocated array of <tt>Delayed</tt>:
<pre>
Delayed[] a = q.toArray(new Delayed[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="remove(java.lang.Object)">
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</a>
<ul class="blockList">
<li class="blockList">
<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, whether or not it has expired.</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="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 all the elements (both expired and
unexpired) in this queue. The iterator does not return the
elements in any particular order. 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</dd></dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
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