source: proiecte/HadoopJUnit/hadoop-0.20.1/docs/api/org/apache/hadoop/metrics/spi/NullContext.html @ 120

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7NullContext (Hadoop 0.20.1 API)
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80<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
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89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.metrics.spi</FONT>
92<BR>
93Class NullContext</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.NullContext</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>NullContext</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>
108Null metrics context: a metrics context which does nothing.  Used as the
109 default context, so that no performance data is emitted if no configuration
110 data is found.
111<P>
112
113<P>
114<HR>
115
116<P>
117<!-- =========== FIELD SUMMARY =========== -->
118
119<A NAME="field_summary"><!-- --></A>
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121<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
122<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
123<B>Field Summary</B></FONT></TH>
124</TR>
125</TABLE>
126&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.metrics.MetricsContext"><!-- --></A>
127<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
128<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
129<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>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#DEFAULT_PERIOD">DEFAULT_PERIOD</A></CODE></TD>
133</TR>
134</TABLE>
135&nbsp;
136<!-- ======== CONSTRUCTOR SUMMARY ======== -->
137
138<A NAME="constructor_summary"><!-- --></A>
139<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
140<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
141<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
142<B>Constructor Summary</B></FONT></TH>
143</TR>
144<TR BGCOLOR="white" CLASS="TableRowColor">
145<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.html#NullContext()">NullContext</A></B>()</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new instance of NullContext</TD>
149</TR>
150</TABLE>
151&nbsp;
152<!-- ========== METHOD SUMMARY =========== -->
153
154<A NAME="method_summary"><!-- --></A>
155<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
156<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
157<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
158<B>Method Summary</B></FONT></TH>
159</TR>
160<TR BGCOLOR="white" CLASS="TableRowColor">
161<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
162<CODE>protected &nbsp;void</CODE></FONT></TD>
163<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.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,
164           <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,
165           <A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A>&nbsp;outRec)</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of emitRecord</TD>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>protected &nbsp;void</CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.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>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of remove</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;void</CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.html#startMonitoring()">startMonitoring</A></B>()</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of startMonitoring</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>protected &nbsp;void</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.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>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do-nothing version of update</TD>
193</TR>
194</TABLE>
195&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.metrics.spi.AbstractMetricsContext"><!-- --></A>
196<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
197<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
198<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>
199</TR>
200<TR BGCOLOR="white" CLASS="TableRowColor">
201<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#init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)">init</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#stopMonitoring()">stopMonitoring</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#unregisterUpdater(org.apache.hadoop.metrics.Updater)">unregisterUpdater</A></CODE></TD>
202</TR>
203</TABLE>
204&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
205<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
206<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
207<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>
208</TR>
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210<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
211</TR>
212</TABLE>
213&nbsp;
214<P>
215
216<!-- ========= CONSTRUCTOR DETAIL ======== -->
217
218<A NAME="constructor_detail"><!-- --></A>
219<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
220<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
221<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
222<B>Constructor Detail</B></FONT></TH>
223</TR>
224</TABLE>
225
226<A NAME="NullContext()"><!-- --></A><H3>
227NullContext</H3>
228<PRE>
229public <B>NullContext</B>()</PRE>
230<DL>
231<DD>Creates a new instance of NullContext
232<P>
233</DL>
234
235<!-- ============ METHOD DETAIL ========== -->
236
237<A NAME="method_detail"><!-- --></A>
238<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
239<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
240<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
241<B>Method Detail</B></FONT></TH>
242</TR>
243</TABLE>
244
245<A NAME="startMonitoring()"><!-- --></A><H3>
246startMonitoring</H3>
247<PRE>
248public void <B>startMonitoring</B>()</PRE>
249<DL>
250<DD>Do-nothing version of startMonitoring
251<P>
252<DD><DL>
253<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#startMonitoring()">startMonitoring</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#startMonitoring()">startMonitoring</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>
254</DD>
255<DD><DL>
256</DL>
257</DD>
258</DL>
259<HR>
260
261<A NAME="emitRecord(java.lang.String, java.lang.String, org.apache.hadoop.metrics.spi.OutputRecord)"><!-- --></A><H3>
262emitRecord</H3>
263<PRE>
264protected 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,
265                          <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,
266                          <A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A>&nbsp;outRec)</PRE>
267<DL>
268<DD>Do-nothing version of emitRecord
269<P>
270<DD><DL>
271<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>
272</DD>
273<DD><DL>
274</DL>
275</DD>
276</DL>
277<HR>
278
279<A NAME="update(org.apache.hadoop.metrics.spi.MetricsRecordImpl)"><!-- --></A><H3>
280update</H3>
281<PRE>
282protected 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>
283<DL>
284<DD>Do-nothing version of update
285<P>
286<DD><DL>
287<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>
288</DD>
289<DD><DL>
290</DL>
291</DD>
292</DL>
293<HR>
294
295<A NAME="remove(org.apache.hadoop.metrics.spi.MetricsRecordImpl)"><!-- --></A><H3>
296remove</H3>
297<PRE>
298protected 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>
299<DL>
300<DD>Do-nothing version of remove
301<P>
302<DD><DL>
303<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>
304</DD>
305<DD><DL>
306</DL>
307</DD>
308</DL>
309<!-- ========= END OF CLASS DATA ========= -->
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