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7NullContextWithUpdateThread (Hadoop 0.20.1 API)
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89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.metrics.spi</FONT>
92<BR>
93Class NullContextWithUpdateThread</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">org.apache.hadoop.metrics.spi.AbstractMetricsContext</A>
97      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.metrics.spi.NullContextWithUpdateThread</B>
98</PRE>
99<DL>
100<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></DD>
101</DL>
102<HR>
103<DL>
104<DT><PRE>public class <B>NullContextWithUpdateThread</B><DT>extends <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></DL>
105</PRE>
106
107<P>
108A null context which has a thread calling
109 periodically when monitoring is started. This keeps the data sampled
110 correctly.
111 In all other respects, this is like the NULL context: No data is emitted.
112 This is suitable for Monitoring systems like JMX which reads the metrics
113  when someone reads the data from JMX.
114 
115 The default impl of start and stop monitoring:
116  is the AbstractMetricsContext is good enough.
117<P>
118
119<P>
120<HR>
121
122<P>
123<!-- =========== FIELD SUMMARY =========== -->
124
125<A NAME="field_summary"><!-- --></A>
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128<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
129<B>Field Summary</B></FONT></TH>
130</TR>
131</TABLE>
132&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.metrics.MetricsContext"><!-- --></A>
133<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
134<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
135<TH ALIGN="left"><B>Fields inherited from interface org.apache.hadoop.metrics.<A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></B></TH>
136</TR>
137<TR BGCOLOR="white" CLASS="TableRowColor">
138<TD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#DEFAULT_PERIOD">DEFAULT_PERIOD</A></CODE></TD>
139</TR>
140</TABLE>
141&nbsp;
142<!-- ======== CONSTRUCTOR SUMMARY ======== -->
143
144<A NAME="constructor_summary"><!-- --></A>
145<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
146<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
147<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
148<B>Constructor Summary</B></FONT></TH>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html#NullContextWithUpdateThread()">NullContextWithUpdateThread</A></B>()</CODE>
152
153<BR>
154&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new instance of NullContextWithUpdateThread</TD>
155</TR>
156</TABLE>
157&nbsp;
158<!-- ========== METHOD SUMMARY =========== -->
159
160<A NAME="method_summary"><!-- --></A>
161<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
162<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
163<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
164<B>Method Summary</B></FONT></TH>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>protected &nbsp;void</CODE></FONT></TD>
169<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html#emitRecord(java.lang.String, java.lang.String, org.apache.hadoop.metrics.spi.OutputRecord)">emitRecord</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;contextName,
170           <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;recordName,
171           <A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A>&nbsp;outRec)</CODE>
172
173<BR>
174&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of emitRecord</TD>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>&nbsp;void</CODE></FONT></TD>
179<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html#init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)">init</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;contextName,
180     <A HREF="../../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A>&nbsp;factory)</CODE>
181
182<BR>
183&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes the context.</TD>
184</TR>
185<TR BGCOLOR="white" CLASS="TableRowColor">
186<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
187<CODE>protected &nbsp;void</CODE></FONT></TD>
188<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html#remove(org.apache.hadoop.metrics.spi.MetricsRecordImpl)">remove</A></B>(<A HREF="../../../../../org/apache/hadoop/metrics/spi/MetricsRecordImpl.html" title="class in org.apache.hadoop.metrics.spi">MetricsRecordImpl</A>&nbsp;record)</CODE>
189
190<BR>
191&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of remove</TD>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
195<CODE>protected &nbsp;void</CODE></FONT></TD>
196<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html#update(org.apache.hadoop.metrics.spi.MetricsRecordImpl)">update</A></B>(<A HREF="../../../../../org/apache/hadoop/metrics/spi/MetricsRecordImpl.html" title="class in org.apache.hadoop.metrics.spi">MetricsRecordImpl</A>&nbsp;record)</CODE>
197
198<BR>
199&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of update</TD>
200</TR>
201</TABLE>
202&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.metrics.spi.AbstractMetricsContext"><!-- --></A>
203<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
204<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
205<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.metrics.spi.<A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></B></TH>
206</TR>
207<TR BGCOLOR="white" CLASS="TableRowColor">
208<TD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#close()">close</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#createRecord(java.lang.String)">createRecord</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#flush()">flush</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getAttribute(java.lang.String)">getAttribute</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getAttributeTable(java.lang.String)">getAttributeTable</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getContextFactory()">getContextFactory</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getContextName()">getContextName</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getPeriod()">getPeriod</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#isMonitoring()">isMonitoring</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#newRecord(java.lang.String)">newRecord</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#registerUpdater(org.apache.hadoop.metrics.Updater)">registerUpdater</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#setPeriod(int)">setPeriod</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#startMonitoring()">startMonitoring</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#stopMonitoring()">stopMonitoring</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#unregisterUpdater(org.apache.hadoop.metrics.Updater)">unregisterUpdater</A></CODE></TD>
209</TR>
210</TABLE>
211&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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214<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
215</TR>
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218</TR>
219</TABLE>
220&nbsp;
221<P>
222
223<!-- ========= CONSTRUCTOR DETAIL ======== -->
224
225<A NAME="constructor_detail"><!-- --></A>
226<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
227<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
228<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
229<B>Constructor Detail</B></FONT></TH>
230</TR>
231</TABLE>
232
233<A NAME="NullContextWithUpdateThread()"><!-- --></A><H3>
234NullContextWithUpdateThread</H3>
235<PRE>
236public <B>NullContextWithUpdateThread</B>()</PRE>
237<DL>
238<DD>Creates a new instance of NullContextWithUpdateThread
239<P>
240</DL>
241
242<!-- ============ METHOD DETAIL ========== -->
243
244<A NAME="method_detail"><!-- --></A>
245<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
246<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
247<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
248<B>Method Detail</B></FONT></TH>
249</TR>
250</TABLE>
251
252<A NAME="init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)"><!-- --></A><H3>
253init</H3>
254<PRE>
255public void <B>init</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;contextName,
256                 <A HREF="../../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A>&nbsp;factory)</PRE>
257<DL>
258<DD><B>Description copied from class: <CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)">AbstractMetricsContext</A></CODE></B></DD>
259<DD>Initializes the context.
260<P>
261<DD><DL>
262<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)">init</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)">init</A></CODE> in class <CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></CODE></DL>
263</DD>
264<DD><DL>
265<DT><B>Parameters:</B><DD><CODE>contextName</CODE> - The given name for this context<DD><CODE>factory</CODE> - The creator of this context</DL>
266</DD>
267</DL>
268<HR>
269
270<A NAME="emitRecord(java.lang.String, java.lang.String, org.apache.hadoop.metrics.spi.OutputRecord)"><!-- --></A><H3>
271emitRecord</H3>
272<PRE>
273protected void <B>emitRecord</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;contextName,
274                          <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;recordName,
275                          <A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A>&nbsp;outRec)</PRE>
276<DL>
277<DD>Do-nothing version of emitRecord
278<P>
279<DD><DL>
280<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#emitRecord(java.lang.String, java.lang.String, org.apache.hadoop.metrics.spi.OutputRecord)">emitRecord</A></CODE> in class <CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></CODE></DL>
281</DD>
282<DD><DL>
283</DL>
284</DD>
285</DL>
286<HR>
287
288<A NAME="update(org.apache.hadoop.metrics.spi.MetricsRecordImpl)"><!-- --></A><H3>
289update</H3>
290<PRE>
291protected void <B>update</B>(<A HREF="../../../../../org/apache/hadoop/metrics/spi/MetricsRecordImpl.html" title="class in org.apache.hadoop.metrics.spi">MetricsRecordImpl</A>&nbsp;record)</PRE>
292<DL>
293<DD>Do-nothing version of update
294<P>
295<DD><DL>
296<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#update(org.apache.hadoop.metrics.spi.MetricsRecordImpl)">update</A></CODE> in class <CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></CODE></DL>
297</DD>
298<DD><DL>
299</DL>
300</DD>
301</DL>
302<HR>
303
304<A NAME="remove(org.apache.hadoop.metrics.spi.MetricsRecordImpl)"><!-- --></A><H3>
305remove</H3>
306<PRE>
307protected void <B>remove</B>(<A HREF="../../../../../org/apache/hadoop/metrics/spi/MetricsRecordImpl.html" title="class in org.apache.hadoop.metrics.spi">MetricsRecordImpl</A>&nbsp;record)</PRE>
308<DL>
309<DD>Do-nothing version of remove
310<P>
311<DD><DL>
312<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#remove(org.apache.hadoop.metrics.spi.MetricsRecordImpl)">remove</A></CODE> in class <CODE><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></CODE></DL>
313</DD>
314<DD><DL>
315</DL>
316</DD>
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