source: branches/objectmq_old/lib/rabbitmq-java-client-javadoc-3.0.1/com/rabbitmq/utility/BlockingCell.html

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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2<!--NewPage-->
3<HTML>
4<HEAD>
5<!-- Generated by javadoc (build 1.6.0_18) on Tue Dec 11 11:47:09 GMT 2012 -->
6<TITLE>
7BlockingCell
8</TITLE>
9
10<META NAME="date" CONTENT="2012-12-11">
11
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15function windowTitle()
16{
17    if (location.href.indexOf('is-external=true') == -1) {
18        parent.document.title="BlockingCell";
19    }
20}
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90com.rabbitmq.utility</FONT>
91<BR>
92Class BlockingCell&lt;T&gt;</H2>
93<PRE>
94java.lang.Object
95  <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.rabbitmq.utility.BlockingCell&lt;T&gt;</B>
96</PRE>
97<DL>
98<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../com/rabbitmq/utility/BlockingValueOrException.html" title="class in com.rabbitmq.utility">BlockingValueOrException</A></DD>
99</DL>
100<HR>
101<DL>
102<DT><PRE>public class <B>BlockingCell&lt;T&gt;</B><DT>extends java.lang.Object</DL>
103</PRE>
104
105<P>
106Simple one-shot IPC mechanism. Essentially a one-place buffer that cannot be emptied once filled.
107<P>
108
109<P>
110<HR>
111
112<P>
113
114<!-- ======== CONSTRUCTOR SUMMARY ======== -->
115
116<A NAME="constructor_summary"><!-- --></A>
117<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
118<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
119<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
120<B>Constructor Summary</B></FONT></TH>
121</TR>
122<TR BGCOLOR="white" CLASS="TableRowColor">
123<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#BlockingCell()">BlockingCell</A></B>()</CODE>
124
125<BR>
126&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Instantiate a new BlockingCell waiting for a value of the specified type.</TD>
127</TR>
128</TABLE>
129&nbsp;
130<!-- ========== METHOD SUMMARY =========== -->
131
132<A NAME="method_summary"><!-- --></A>
133<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
134<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
135<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
136<B>Method Summary</B></FONT></TH>
137</TR>
138<TR BGCOLOR="white" CLASS="TableRowColor">
139<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
140<CODE>&nbsp;<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A></CODE></FONT></TD>
141<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#get()">get</A></B>()</CODE>
142
143<BR>
144&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wait for a value, and when one arrives, return it (without clearing it).</TD>
145</TR>
146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
148<CODE>&nbsp;<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A></CODE></FONT></TD>
149<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#get(long)">get</A></B>(long&nbsp;timeout)</CODE>
150
151<BR>
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wait for a value, and when one arrives, return it (without clearing it).</TD>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
156<CODE>&nbsp;void</CODE></FONT></TD>
157<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#set(T)">set</A></B>(<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A>&nbsp;newValue)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Store a value in this BlockingCell, throwing AssertionError if the cell already has a value.</TD>
161</TR>
162<TR BGCOLOR="white" CLASS="TableRowColor">
163<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
164<CODE>&nbsp;boolean</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#setIfUnset(T)">setIfUnset</A></B>(<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A>&nbsp;newValue)</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Store a value in this BlockingCell if it doesn't already have a value.</TD>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>&nbsp;<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A></CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#uninterruptibleGet()">uninterruptibleGet</A></B>()</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As get(), but catches and ignores InterruptedException, retrying until a value appears.</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A></CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../com/rabbitmq/utility/BlockingCell.html#uninterruptibleGet(int)">uninterruptibleGet</A></B>(int&nbsp;timeout)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As get(long timeout), but catches and ignores InterruptedException, retrying until
185 a value appears or until specified timeout is reached.</TD>
186</TR>
187</TABLE>
188&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
189<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
190<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
191<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
195</TR>
196</TABLE>
197&nbsp;
198<P>
199
200<!-- ========= CONSTRUCTOR DETAIL ======== -->
201
202<A NAME="constructor_detail"><!-- --></A>
203<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
204<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
205<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
206<B>Constructor Detail</B></FONT></TH>
207</TR>
208</TABLE>
209
210<A NAME="BlockingCell()"><!-- --></A><H3>
211BlockingCell</H3>
212<PRE>
213public <B>BlockingCell</B>()</PRE>
214<DL>
215<DD>Instantiate a new BlockingCell waiting for a value of the specified type.
216<P>
217</DL>
218
219<!-- ============ METHOD DETAIL ========== -->
220
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225<B>Method Detail</B></FONT></TH>
226</TR>
227</TABLE>
228
229<A NAME="get()"><!-- --></A><H3>
230get</H3>
231<PRE>
232public <A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A> <B>get</B>()
233      throws java.lang.InterruptedException</PRE>
234<DL>
235<DD>Wait for a value, and when one arrives, return it (without clearing it). If there's already a value present, there's no need to wait - the existing value
236 is returned.
237<P>
238<DD><DL>
239
240<DT><B>Returns:</B><DD>the waited-for value
241<DT><B>Throws:</B>
242<DD><CODE>java.lang.InterruptedException</CODE> - if this thread is interrupted</DL>
243</DD>
244</DL>
245<HR>
246
247<A NAME="get(long)"><!-- --></A><H3>
248get</H3>
249<PRE>
250public <A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A> <B>get</B>(long&nbsp;timeout)
251      throws java.lang.InterruptedException,
252             java.util.concurrent.TimeoutException</PRE>
253<DL>
254<DD>Wait for a value, and when one arrives, return it (without clearing it). If there's
255 already a value present, there's no need to wait - the existing value is returned.
256 If timeout is reached and value hasn't arrived, TimeoutException is thrown.
257<P>
258<DD><DL>
259<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - timeout in milliseconds. -1 effectively means infinity
260<DT><B>Returns:</B><DD>the waited-for value
261<DT><B>Throws:</B>
262<DD><CODE>java.lang.InterruptedException</CODE> - if this thread is interrupted
263<DD><CODE>java.util.concurrent.TimeoutException</CODE></DL>
264</DD>
265</DL>
266<HR>
267
268<A NAME="uninterruptibleGet()"><!-- --></A><H3>
269uninterruptibleGet</H3>
270<PRE>
271public <A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A> <B>uninterruptibleGet</B>()</PRE>
272<DL>
273<DD>As get(), but catches and ignores InterruptedException, retrying until a value appears.
274<P>
275<DD><DL>
276
277<DT><B>Returns:</B><DD>the waited-for value</DL>
278</DD>
279</DL>
280<HR>
281
282<A NAME="uninterruptibleGet(int)"><!-- --></A><H3>
283uninterruptibleGet</H3>
284<PRE>
285public <A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A> <B>uninterruptibleGet</B>(int&nbsp;timeout)
286                     throws java.util.concurrent.TimeoutException</PRE>
287<DL>
288<DD>As get(long timeout), but catches and ignores InterruptedException, retrying until
289 a value appears or until specified timeout is reached. If timeout is reached,
290 TimeoutException is thrown.
291 We also use System.nanoTime() to behave correctly when system clock jumps around.
292<P>
293<DD><DL>
294<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - timeout in milliseconds. -1 means 'infinity': never time out
295<DT><B>Returns:</B><DD>the waited-for value
296<DT><B>Throws:</B>
297<DD><CODE>java.util.concurrent.TimeoutException</CODE></DL>
298</DD>
299</DL>
300<HR>
301
302<A NAME="set(java.lang.Object)"><!-- --></A><A NAME="set(T)"><!-- --></A><H3>
303set</H3>
304<PRE>
305public void <B>set</B>(<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A>&nbsp;newValue)</PRE>
306<DL>
307<DD>Store a value in this BlockingCell, throwing AssertionError if the cell already has a value.
308<P>
309<DD><DL>
310<DT><B>Parameters:</B><DD><CODE>newValue</CODE> - the new value to store</DL>
311</DD>
312</DL>
313<HR>
314
315<A NAME="setIfUnset(java.lang.Object)"><!-- --></A><A NAME="setIfUnset(T)"><!-- --></A><H3>
316setIfUnset</H3>
317<PRE>
318public boolean <B>setIfUnset</B>(<A HREF="../../../com/rabbitmq/utility/BlockingCell.html" title="type parameter in BlockingCell">T</A>&nbsp;newValue)</PRE>
319<DL>
320<DD>Store a value in this BlockingCell if it doesn't already have a value.
321<P>
322<DD><DL>
323<DT><B>Parameters:</B><DD><CODE>newValue</CODE> - the new value to store
324<DT><B>Returns:</B><DD>true if this call to setIfUnset actually updated the BlockingCell; false if the cell already had a value.</DL>
325</DD>
326</DL>
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