unbiasedqueue.synchronizedqueue.html

jxta的api库

<DL>
<DD>Return the next Object from the queue without removing it.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#peek()">peek</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Object, null if the queue is empty.</DL>
</DD>
</DL>
<HR>

<A NAME="pop()"><!-- --></A><H3>
pop</H3>
<PRE>
public java.lang.Object <B>pop</B>()</PRE>
<DL>
<DD>Remove and return the next Object from the queue.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#pop()">pop</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Object, null if the queue is empty.</DL>
</DD>
</DL>
<HR>

<A NAME="pop(long)"><!-- --></A><H3>
pop</H3>
<PRE>
public java.lang.Object <B>pop</B>(long&nbsp;timeout)
                     throws java.lang.InterruptedException</PRE>
<DL>
<DD>Gets a Object from the queue. If no Object is immediately available,
 then wait the specified amount of time for an Object to be inserted.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#pop(long)">pop</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - Amount of time to wait in milliseconds for an object to
 be available. Per Java convention, a timeout of zero (0) means wait an
 infinite amount of time. Negative values mean do not wait at all.
<DT><B>Returns:</B><DD>The next object in the queue.
<DT><B>Throws:</B>
<DD><CODE>java.lang.InterruptedException</CODE> - if the operation is interrupted before
 the timeout interval is completed.</DL>
</DD>
</DL>
<HR>

<A NAME="popMulti(int)"><!-- --></A><H3>
popMulti</H3>
<PRE>
public java.lang.Object[] <B>popMulti</B>(int&nbsp;maxObjs)</PRE>
<DL>
<DD>Returns an array of objects, possibly empty, from the queue.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#popMulti(int)">popMulti</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>maxObjs</CODE> - the maximum number of items to return.
<DT><B>Returns:</B><DD>an array of objects, possibly empty containing the returned
  queue elements.</DL>
</DD>
</DL>
<HR>

<A NAME="getMaxQueueSize()"><!-- --></A><H3>
getMaxQueueSize</H3>
<PRE>
public int <B>getMaxQueueSize</B>()</PRE>
<DL>
<DD>How many objects will fit in this queue
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getMaxQueueSize()">getMaxQueueSize</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>int indicating how many objects will fit in the queue.</DL>
</DD>
</DL>
<HR>

<A NAME="setMaxQueueSize(int)"><!-- --></A><H3>
setMaxQueueSize</H3>
<PRE>
public void <B>setMaxQueueSize</B>(int&nbsp;maxObjs)</PRE>
<DL>
<DD>Set how many objects this queue may store. Note that if there are more
  objects already in the queue than the specified amount then the queue
  will retain its current capacity.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#setMaxQueueSize(int)">setMaxQueueSize</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>maxObjs</CODE> - The number of objects which the queue must be able to
  store.</DL>
</DD>
</DL>
<HR>

<A NAME="getCurrentInQueue()"><!-- --></A><H3>
getCurrentInQueue</H3>
<PRE>
public int <B>getCurrentInQueue</B>()</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></B></DD>
<DD>Return the number of elements currently in the queue. This method is
  useful for statistical sampling, but should not be used to determine
  program logic due to the multi-threaded behaviour of these queues.

  <p/>You should use the return values and timeout behaviour of the
  <A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#push(java.lang.Object)"><CODE>UnbiasedQueue.push(Object)</CODE></A> and <A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#pop(long)"><CODE>UnbiasedQueue.pop(long)</CODE></A> methods to regulate how you
  use the queue.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getCurrentInQueue()">getCurrentInQueue</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the number of elements currently in the queue. Be warned that
  even two sequential calls to this method may return different answers
  due to activity on other threads.</DL>
</DD>
</DL>
<HR>

<A NAME="getNumEnqueued()"><!-- --></A><H3>
getNumEnqueued</H3>
<PRE>
public long <B>getNumEnqueued</B>()</PRE>
<DL>
<DD>Return the total number of objects which have been enqueued on to this
  queue during its existance.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getNumEnqueued()">getNumEnqueued</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>how many objects have been queued.</DL>
</DD>
</DL>
<HR>

<A NAME="getAvgInQueueAtEnqueue()"><!-- --></A><H3>
getAvgInQueueAtEnqueue</H3>
<PRE>
public double <B>getAvgInQueueAtEnqueue</B>()</PRE>
<DL>
<DD>Return the average number of elements in the queue at Enqueue time.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getAvgInQueueAtEnqueue()">getAvgInQueueAtEnqueue</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>average number of elements which were in the queue at during all
  of the "push" operations which returned a "true" result. Does not
  include the item being pushed. If no elements have ever been enqueued
  then "NaN" will be returned.</DL>
</DD>
</DL>
<HR>

<A NAME="getNumDequeued()"><!-- --></A><H3>
getNumDequeued</H3>
<PRE>
public long <B>getNumDequeued</B>()</PRE>
<DL>
<DD>Return the total number of objects which have been dequeued from this
  queue during its existance.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getNumDequeued()">getNumDequeued</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>how many objects have been queued.</DL>
</DD>
</DL>
<HR>

<A NAME="getAvgInQueueAtDequeue()"><!-- --></A><H3>
getAvgInQueueAtDequeue</H3>
<PRE>
public double <B>getAvgInQueueAtDequeue</B>()</PRE>
<DL>
<DD>Return the average number of elements in the queue at dequeue time.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getAvgInQueueAtDequeue()">getAvgInQueueAtDequeue</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>average number of elements which were in the queue at during all
  of the "pop" operations which returned a non-null result. Includes the
 item being "pop"ed in the average. If no elements have ever been dequeued
  then "NaN" will be returned.</DL>
</DD>
</DL>
<HR>

<A NAME="getNumDropped()"><!-- --></A><H3>
getNumDropped</H3>
<PRE>
public long <B>getNumDropped</B>()</PRE>
<DL>
<DD>Return the total number of objects which have been dropped by this queue
  during its existance.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html#getNumDropped()">getNumDropped</A></CODE> in class <CODE><A HREF="../../../../net/jxta/impl/util/UnbiasedQueue.html" title="class in net.jxta.impl.util">UnbiasedQueue</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>how many objects have been dropped.</DL>
</DD>
</DL>
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