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<div class="subTitle">edu.emory.mathcs.backport.java.util.concurrent</div>
<h2 title="Class SynchronousQueue" class="title">Class SynchronousQueue</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<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>
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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.SynchronousQueue</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">SynchronousQueue</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">A <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">blocking queue</a> in which each insert
operation must wait for a corresponding remove operation by another
thread, and vice versa. A synchronous queue does not have any
internal capacity, not even a capacity of one. You cannot
<tt>peek</tt> at a synchronous queue because an element is only
present when you try to remove it; you cannot insert an element
(using any method) unless another thread is trying to remove it;
you cannot iterate as there is nothing to iterate. The
<em>head</em> of the queue is the element that the first queued
inserting thread is trying to add to the queue; if there is no such
queued thread then no element is available for removal and
<tt>poll()</tt> will return <tt>null</tt>. For purposes of other
<tt>Collection</tt> methods (for example <tt>contains</tt>), a
<tt>SynchronousQueue</tt> acts as an empty collection. This queue
does not permit <tt>null</tt> elements.
<p>Synchronous queues are similar to rendezvous channels used in
CSP and Ada. They are well suited for handoff designs, in which an
object running in one thread must sync up with an object running
in another thread in order to hand it some information, event, or
task.
<p> This class supports an optional fairness policy for ordering
waiting producer and consumer threads. By default, this ordering
is not guaranteed. However, a queue constructed with fairness set
to <tt>true</tt> grants threads access in FIFO order. Fairness
generally decreases throughput but reduces variability and avoids
starvation.
<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.SynchronousQueue">Serialized Form</a></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/SynchronousQueue.html#SynchronousQueue()">SynchronousQueue</a></strong>()</code>
<div class="block">Creates a <tt>SynchronousQueue</tt> with nonfair access policy.</div>
</td>
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<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html#SynchronousQueue(boolean)">SynchronousQueue</a></strong>(boolean fair)</code>
<div class="block">Creates a <tt>SynchronousQueue</tt> with specified fairness policy.</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/SynchronousQueue.html#clear()">clear</a></strong>()</code>
<div class="block">Does nothing.</div>
</td>
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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/SynchronousQueue.html#contains(java.lang.Object)">contains</a></strong>(java.lang.Object o)</code>
<div class="block">Always returns <tt>false</tt>.</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/SynchronousQueue.html#containsAll(java.util.Collection)">containsAll</a></strong>(java.util.Collection c)</code>
<div class="block">Returns <tt>false</tt> unless the given collection is empty.</div>
</td>
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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/SynchronousQueue.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/SynchronousQueue.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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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html#isEmpty()">isEmpty</a></strong>()</code>
<div class="block">Always returns <tt>true</tt>.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>java.util.Iterator</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html#iterator()">iterator</a></strong>()</code>
<div class="block">Returns an empty iterator in which <tt>hasNext</tt> always returns
<tt>false</tt>.</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/SynchronousQueue.html#offer(java.lang.Object)">offer</a></strong>(java.lang.Object e)</code>
<div class="block">Inserts the specified element into this queue, if another thread is
waiting to receive it.</div>
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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/SynchronousQueue.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 queue, waiting if necessary
up to the specified wait time for another thread to receive it.</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/SynchronousQueue.html#peek()">peek</a></strong>()</code>
<div class="block">Always returns <tt>null</tt>.</div>
</td>
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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/SynchronousQueue.html#poll()">poll</a></strong>()</code>
<div class="block">Retrieves and removes the head of this queue, if another thread
is currently making an element available.</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/SynchronousQueue.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 up to the specified wait time, for another thread
to insert it.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html#put(java.lang.Object)">put</a></strong>(java.lang.Object e)</code>
<div class="block">Adds the specified element to this queue, waiting if necessary for
another thread to receive it.</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/SynchronousQueue.html#remainingCapacity()">remainingCapacity</a></strong>()</code>
<div class="block">Always returns zero.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html#remove(java.lang.Object)">remove</a></strong>(java.lang.Object o)</code>
<div class="block">Always returns <tt>false</tt>.</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/SynchronousQueue.html#removeAll(java.util.Collection)">removeAll</a></strong>(java.util.Collection c)</code>
<div class="block">Always returns <tt>false</tt>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/SynchronousQueue.html#retainAll(java.util.Collection)">retainAll</a></strong>(java.util.Collection c)</code>
<div class="block">Always returns <tt>false</tt>.</div>
</td>
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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/SynchronousQueue.html#size()">size</a></strong>()</code>
<div class="block">Always returns zero.</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/SynchronousQueue.html#take()">take</a></strong>()</code>
<div class="block">Retrieves and removes the head of this queue, waiting if necessary
for another thread to insert it.</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/SynchronousQueue.html#toArray()">toArray</a></strong>()</code>
<div class="block">Returns a zero-length array.</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/SynchronousQueue.html#toArray(java.lang.Object[])">toArray</a></strong>(java.lang.Object[] a)</code>
<div class="block">Sets the zeroeth element of the specified array to <tt>null</tt>
(if the array has non-zero length) and returns it.</div>
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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></code></li>
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<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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<h4>SynchronousQueue</h4>
<pre>public SynchronousQueue()</pre>
<div class="block">Creates a <tt>SynchronousQueue</tt> with nonfair access policy.</div>
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<h4>SynchronousQueue</h4>
<pre>public SynchronousQueue(boolean fair)</pre>
<div class="block">Creates a <tt>SynchronousQueue</tt> with specified fairness policy.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>fair</code> - if true, threads contend in FIFO order for access;
otherwise the order is unspecified.</dd></dl>
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<a name="put(java.lang.Object)">
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<h4>put</h4>
<pre>public void put(java.lang.Object e)
throws java.lang.InterruptedException</pre>
<div class="block">Adds the specified element to this queue, waiting if necessary for
another thread to receive it.</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>
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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 into this queue, waiting if necessary
up to the specified wait time for another thread to receive it.</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 a consumer appears.</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>
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<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
for another thread to insert it.</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>
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</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">Retrieves and removes the head of this queue, waiting
if necessary up to the specified wait time, for another thread
to insert it.</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 present.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code> - if interrupted while waiting</dd></dl>
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<pre>public boolean offer(java.lang.Object e)</pre>
<div class="block">Inserts the specified element into this queue, if another thread is
waiting to receive it.</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>
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<pre>public java.lang.Object poll()</pre>
<div class="block">Retrieves and removes the head of this queue, if another thread
is currently making an element available.</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 no
element is available.</dd></dl>
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<pre>public boolean isEmpty()</pre>
<div class="block">Always returns <tt>true</tt>.
A <tt>SynchronousQueue</tt> has no internal capacity.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>isEmpty</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>isEmpty</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt></dd></dl>
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<h4>size</h4>
<pre>public int size()</pre>
<div class="block">Always returns zero.
A <tt>SynchronousQueue</tt> has no internal capacity.</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>zero</dd></dl>
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<pre>public int remainingCapacity()</pre>
<div class="block">Always returns zero.
A <tt>SynchronousQueue</tt> has no internal capacity.</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>zero</dd></dl>
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<h4>clear</h4>
<pre>public void clear()</pre>
<div class="block">Does nothing.
A <tt>SynchronousQueue</tt> has no internal capacity.</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>
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<h4>contains</h4>
<pre>public boolean contains(java.lang.Object o)</pre>
<div class="block">Always returns <tt>false</tt>.
A <tt>SynchronousQueue</tt> has no internal capacity.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue.html#contains(java.lang.Object)">contains</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>contains</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>contains</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>o</code> - object to be checked for containment in this queue</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>false</tt></dd></dl>
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<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">Always returns <tt>false</tt>.
A <tt>SynchronousQueue</tt> has no internal capacity.</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> - the element to remove</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>false</tt></dd></dl>
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<pre>public boolean containsAll(java.util.Collection c)</pre>
<div class="block">Returns <tt>false</tt> unless the given collection is empty.
A <tt>SynchronousQueue</tt> has no internal capacity.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>containsAll</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>containsAll</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - the collection</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>false</tt> unless the given collection is empty</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified collection is null</dd></dl>
</li>
</ul>
<a name="removeAll(java.util.Collection)">
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<h4>removeAll</h4>
<pre>public boolean removeAll(java.util.Collection c)</pre>
<div class="block">Always returns <tt>false</tt>.
A <tt>SynchronousQueue</tt> has no internal capacity.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>removeAll</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>removeAll</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - the collection</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>false</tt></dd></dl>
</li>
</ul>
<a name="retainAll(java.util.Collection)">
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<h4>retainAll</h4>
<pre>public boolean retainAll(java.util.Collection c)</pre>
<div class="block">Always returns <tt>false</tt>.
A <tt>SynchronousQueue</tt> has no internal capacity.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>retainAll</code> in interface <code>java.util.Collection</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>retainAll</code> in class <code>java.util.AbstractCollection</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - the collection</dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>false</tt></dd></dl>
</li>
</ul>
<a name="peek()">
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<li class="blockList">
<h4>peek</h4>
<pre>public java.lang.Object peek()</pre>
<div class="block">Always returns <tt>null</tt>.
A <tt>SynchronousQueue</tt> does not return elements
unless actively waited on.</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><tt>null</tt></dd></dl>
</li>
</ul>
<a name="iterator()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>iterator</h4>
<pre>public java.util.Iterator iterator()</pre>
<div class="block">Returns an empty iterator in which <tt>hasNext</tt> always returns
<tt>false</tt>.</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 empty iterator</dd></dl>
</li>
</ul>
<a name="toArray()">
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</a>
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<h4>toArray</h4>
<pre>public java.lang.Object[] toArray()</pre>
<div class="block">Returns a zero-length array.</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>a zero-length array</dd></dl>
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<a name="toArray(java.lang.Object[])">
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<pre>public java.lang.Object[] toArray(java.lang.Object[] a)</pre>
<div class="block">Sets the zeroeth element of the specified array to <tt>null</tt>
(if the array has non-zero length) and returns it.</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</dd>
<dt><span class="strong">Returns:</span></dt><dd>the specified array</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if the specified array is null</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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</a>
<ul class="blockListLast">
<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>
</li>
</ul>
</li>
</ul>
</div>
</div>
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