boundedbuffer.html

turbine教程

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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="DEFAULT_CAPACITY"><!-- --></A><H3>
DEFAULT_CAPACITY</H3>
<PRE>
public static final int <B>DEFAULT_CAPACITY</B></PRE>
<DL>
<DD>The default capacity.</DL>
<HR>

<A NAME="array_"><!-- --></A><H3>
array_</H3>
<PRE>
protected final java.lang.Object[] <B>array_</B></PRE>
<DL>
</DL>
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<A NAME="takePtr_"><!-- --></A><H3>
takePtr_</H3>
<PRE>
protected int <B>takePtr_</B></PRE>
<DL>
</DL>
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<A NAME="putPtr_"><!-- --></A><H3>
putPtr_</H3>
<PRE>
protected int <B>putPtr_</B></PRE>
<DL>
</DL>
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<A NAME="usedSlots_"><!-- --></A><H3>
usedSlots_</H3>
<PRE>
protected int <B>usedSlots_</B></PRE>
<DL>
</DL>
<HR>

<A NAME="emptySlots_"><!-- --></A><H3>
emptySlots_</H3>
<PRE>
protected int <B>emptySlots_</B></PRE>
<DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<A NAME="BoundedBuffer(int)"><!-- --></A><H3>
BoundedBuffer</H3>
<PRE>
public <B>BoundedBuffer</B>(int&nbsp;capacity)
              throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>Creates a buffer with the given capacity.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>capacity</CODE> - the capacity.<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - if capacity less or equal to zero.</DL>
</DD>
</DL>
<HR>

<A NAME="BoundedBuffer()"><!-- --></A><H3>
BoundedBuffer</H3>
<PRE>
public <B>BoundedBuffer</B>()</PRE>
<DL>
<DD>Creates a buffer with the default capacity</DL>

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<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Returns the number of elements in the buffer.
 This is only a snapshot value, that may change
 immediately after returning.<DD><DL>
<DT><B>Returns:</B><DD>the size.</DL>
</DD>
</DL>
<HR>

<A NAME="capacity()"><!-- --></A><H3>
capacity</H3>
<PRE>
public int <B>capacity</B>()</PRE>
<DL>
<DD>Returns the capacity of the buffer.<DD><DL>
<DT><B>Returns:</B><DD>the capacity.</DL>
</DD>
</DL>
<HR>

<A NAME="peek()"><!-- --></A><H3>
peek</H3>
<PRE>
public java.lang.Object <B>peek</B>()</PRE>
<DL>
<DD>Peeks, but does not remove the top item from the buffer.<DD><DL>
<DT><B>Returns:</B><DD>the object or null.</DL>
</DD>
</DL>
<HR>

<A NAME="offer(java.lang.Object)"><!-- --></A><H3>
offer</H3>
<PRE>
public boolean <B>offer</B>(java.lang.Object&nbsp;x)</PRE>
<DL>
<DD>Puts an item in the buffer only if there is capacity available.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>item</CODE> - the item to be inserted.<DT><B>Returns:</B><DD>true if accepted, else false.</DL>
</DD>
</DL>
<HR>

<A NAME="poll()"><!-- --></A><H3>
poll</H3>
<PRE>
public java.lang.Object <B>poll</B>()</PRE>
<DL>
<DD>Polls and removes the top item from the buffer if one is available.<DD><DL>
<DT><B>Returns:</B><DD>the oldest item from the buffer, or null if the buffer is empty.</DL>
</DD>
</DL>
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