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7AbstractMetricsContext (Hadoop 0.20.1 API)
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91org.apache.hadoop.metrics.spi</FONT>
92<BR>
93Class AbstractMetricsContext</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 "><B>org.apache.hadoop.metrics.spi.AbstractMetricsContext</B>
97</PRE>
98<DL>
99<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>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../org/apache/hadoop/metrics/spi/CompositeContext.html" title="class in org.apache.hadoop.metrics.spi">CompositeContext</A>, <A HREF="../../../../../org/apache/hadoop/metrics/file/FileContext.html" title="class in org.apache.hadoop.metrics.file">FileContext</A>, <A HREF="../../../../../org/apache/hadoop/metrics/ganglia/GangliaContext.html" title="class in org.apache.hadoop.metrics.ganglia">GangliaContext</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.html" title="class in org.apache.hadoop.metrics.spi">NullContext</A>, <A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html" title="class in org.apache.hadoop.metrics.spi">NullContextWithUpdateThread</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public abstract class <B>AbstractMetricsContext</B><DT>extends <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><DT>implements <A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></DL>
107</PRE>
108
109<P>
110The main class of the Service Provider Interface.  This class should be
111 extended in order to integrate the Metrics API with a specific metrics
112 client library. <p/>
113
114 This class implements the internal table of metric data, and the timer
115 on which data is to be sent to the metrics system.  Subclasses must
116 override the abstract <code>emitRecord</code> method in order to transmit
117 the data. <p/>
118<P>
119
120<P>
121<HR>
122
123<P>
124<!-- =========== FIELD SUMMARY =========== -->
125
126<A NAME="field_summary"><!-- --></A>
127<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
128<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
129<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
130<B>Field Summary</B></FONT></TH>
131</TR>
132</TABLE>
133&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.metrics.MetricsContext"><!-- --></A>
134<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
135<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
136<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>
137</TR>
138<TR BGCOLOR="white" CLASS="TableRowColor">
139<TD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#DEFAULT_PERIOD">DEFAULT_PERIOD</A></CODE></TD>
140</TR>
141</TABLE>
142&nbsp;
143<!-- ======== CONSTRUCTOR SUMMARY ======== -->
144
145<A NAME="constructor_summary"><!-- --></A>
146<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
147<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
148<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
149<B>Constructor Summary</B></FONT></TH>
150</TR>
151<TR BGCOLOR="white" CLASS="TableRowColor">
152<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
153<CODE>protected </CODE></FONT></TD>
154<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#AbstractMetricsContext()">AbstractMetricsContext</A></B>()</CODE>
155
156<BR>
157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new instance of AbstractMetricsContext</TD>
158</TR>
159</TABLE>
160&nbsp;
161<!-- ========== METHOD SUMMARY =========== -->
162
163<A NAME="method_summary"><!-- --></A>
164<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
165<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
166<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
167<B>Method Summary</B></FONT></TH>
168</TR>
169<TR BGCOLOR="white" CLASS="TableRowColor">
170<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
171<CODE>&nbsp;void</CODE></FONT></TD>
172<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#close()">close</A></B>()</CODE>
173
174<BR>
175&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stops monitoring and frees buffered data, returning this
176 object to its initial state.</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="../../../../../org/apache/hadoop/metrics/MetricsRecord.html" title="interface in org.apache.hadoop.metrics">MetricsRecord</A></CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#createRecord(java.lang.String)">createRecord</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;recordName)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new AbstractMetricsRecord instance with the given <code>recordName</code>.</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>protected abstract &nbsp;void</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.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,
190           <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,
191           <A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A>&nbsp;outRec)</CODE>
192
193<BR>
194&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sends a record to the metrics system.</TD>
195</TR>
196<TR BGCOLOR="white" CLASS="TableRowColor">
197<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
198<CODE>protected &nbsp;void</CODE></FONT></TD>
199<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#flush()">flush</A></B>()</CODE>
200
201<BR>
202&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called each period after all records have been emitted, this method does nothing.</TD>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
206<CODE>protected &nbsp;<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></CODE></FONT></TD>
207<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getAttribute(java.lang.String)">getAttribute</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;attributeName)</CODE>
208
209<BR>
210&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Convenience method for subclasses to access factory attributes.</TD>
211</TR>
212<TR BGCOLOR="white" CLASS="TableRowColor">
213<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
214<CODE>protected &nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A>&lt;<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>,<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>&gt;</CODE></FONT></TD>
215<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getAttributeTable(java.lang.String)">getAttributeTable</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;tableName)</CODE>
216
217<BR>
218&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an attribute-value map derived from the factory attributes
219 by finding all factory attributes that begin with
220 <i>contextName</i>.<i>tableName</i>.</TD>
221</TR>
222<TR BGCOLOR="white" CLASS="TableRowColor">
223<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
224<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A></CODE></FONT></TD>
225<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getContextFactory()">getContextFactory</A></B>()</CODE>
226
227<BR>
228&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the factory by which this context was created.</TD>
229</TR>
230<TR BGCOLOR="white" CLASS="TableRowColor">
231<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
232<CODE>&nbsp;<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></CODE></FONT></TD>
233<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getContextName()">getContextName</A></B>()</CODE>
234
235<BR>
236&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the context name.</TD>
237</TR>
238<TR BGCOLOR="white" CLASS="TableRowColor">
239<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
240<CODE>&nbsp;int</CODE></FONT></TD>
241<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#getPeriod()">getPeriod</A></B>()</CODE>
242
243<BR>
244&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the timer period.</TD>
245</TR>
246<TR BGCOLOR="white" CLASS="TableRowColor">
247<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
248<CODE>&nbsp;void</CODE></FONT></TD>
249<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.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,
250     <A HREF="../../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A>&nbsp;factory)</CODE>
251
252<BR>
253&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initializes the context.</TD>
254</TR>
255<TR BGCOLOR="white" CLASS="TableRowColor">
256<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
257<CODE>&nbsp;boolean</CODE></FONT></TD>
258<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#isMonitoring()">isMonitoring</A></B>()</CODE>
259
260<BR>
261&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns true if monitoring is currently in progress.</TD>
262</TR>
263<TR BGCOLOR="white" CLASS="TableRowColor">
264<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
265<CODE>protected &nbsp;<A HREF="../../../../../org/apache/hadoop/metrics/MetricsRecord.html" title="interface in org.apache.hadoop.metrics">MetricsRecord</A></CODE></FONT></TD>
266<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#newRecord(java.lang.String)">newRecord</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;recordName)</CODE>
267
268<BR>
269&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subclasses should override this if they subclass MetricsRecordImpl.</TD>
270</TR>
271<TR BGCOLOR="white" CLASS="TableRowColor">
272<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
273<CODE>&nbsp;void</CODE></FONT></TD>
274<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#registerUpdater(org.apache.hadoop.metrics.Updater)">registerUpdater</A></B>(<A HREF="../../../../../org/apache/hadoop/metrics/Updater.html" title="interface in org.apache.hadoop.metrics">Updater</A>&nbsp;updater)</CODE>
275
276<BR>
277&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Registers a callback to be called at time intervals determined by
278 the configuration.</TD>
279</TR>
280<TR BGCOLOR="white" CLASS="TableRowColor">
281<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
282<CODE>protected &nbsp;void</CODE></FONT></TD>
283<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.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>
284
285<BR>
286&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called by MetricsRecordImpl.remove().</TD>
287</TR>
288<TR BGCOLOR="white" CLASS="TableRowColor">
289<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
290<CODE>protected &nbsp;void</CODE></FONT></TD>
291<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#setPeriod(int)">setPeriod</A></B>(int&nbsp;period)</CODE>
292
293<BR>
294&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the timer period</TD>
295</TR>
296<TR BGCOLOR="white" CLASS="TableRowColor">
297<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
298<CODE>&nbsp;void</CODE></FONT></TD>
299<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#startMonitoring()">startMonitoring</A></B>()</CODE>
300
301<BR>
302&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Starts or restarts monitoring, the emitting of metrics records.</TD>
303</TR>
304<TR BGCOLOR="white" CLASS="TableRowColor">
305<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
306<CODE>&nbsp;void</CODE></FONT></TD>
307<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#stopMonitoring()">stopMonitoring</A></B>()</CODE>
308
309<BR>
310&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stops monitoring.</TD>
311</TR>
312<TR BGCOLOR="white" CLASS="TableRowColor">
313<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
314<CODE>&nbsp;void</CODE></FONT></TD>
315<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#unregisterUpdater(org.apache.hadoop.metrics.Updater)">unregisterUpdater</A></B>(<A HREF="../../../../../org/apache/hadoop/metrics/Updater.html" title="interface in org.apache.hadoop.metrics">Updater</A>&nbsp;updater)</CODE>
316
317<BR>
318&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes a callback, if it exists.</TD>
319</TR>
320<TR BGCOLOR="white" CLASS="TableRowColor">
321<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
322<CODE>protected &nbsp;void</CODE></FONT></TD>
323<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.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>
324
325<BR>
326&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Called by MetricsRecordImpl.update().</TD>
327</TR>
328</TABLE>
329&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
330<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
331<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
332<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>
333</TR>
334<TR BGCOLOR="white" CLASS="TableRowColor">
335<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>
336</TR>
337</TABLE>
338&nbsp;
339<P>
340
341<!-- ========= CONSTRUCTOR DETAIL ======== -->
342
343<A NAME="constructor_detail"><!-- --></A>
344<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
345<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
346<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
347<B>Constructor Detail</B></FONT></TH>
348</TR>
349</TABLE>
350
351<A NAME="AbstractMetricsContext()"><!-- --></A><H3>
352AbstractMetricsContext</H3>
353<PRE>
354protected <B>AbstractMetricsContext</B>()</PRE>
355<DL>
356<DD>Creates a new instance of AbstractMetricsContext
357<P>
358</DL>
359
360<!-- ============ METHOD DETAIL ========== -->
361
362<A NAME="method_detail"><!-- --></A>
363<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
364<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
365<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
366<B>Method Detail</B></FONT></TH>
367</TR>
368</TABLE>
369
370<A NAME="init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)"><!-- --></A><H3>
371init</H3>
372<PRE>
373public 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,
374                 <A HREF="../../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A>&nbsp;factory)</PRE>
375<DL>
376<DD>Initializes the context.
377<P>
378<DD><DL>
379<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></DL>
380</DD>
381<DD><DL>
382<DT><B>Parameters:</B><DD><CODE>contextName</CODE> - The given name for this context<DD><CODE>factory</CODE> - The creator of this context</DL>
383</DD>
384</DL>
385<HR>
386
387<A NAME="getAttribute(java.lang.String)"><!-- --></A><H3>
388getAttribute</H3>
389<PRE>
390protected <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> <B>getAttribute</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;attributeName)</PRE>
391<DL>
392<DD>Convenience method for subclasses to access factory attributes.
393<P>
394<DD><DL>
395</DL>
396</DD>
397<DD><DL>
398</DL>
399</DD>
400</DL>
401<HR>
402
403<A NAME="getAttributeTable(java.lang.String)"><!-- --></A><H3>
404getAttributeTable</H3>
405<PRE>
406protected <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A>&lt;<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>,<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>&gt; <B>getAttributeTable</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;tableName)</PRE>
407<DL>
408<DD>Returns an attribute-value map derived from the factory attributes
409 by finding all factory attributes that begin with
410 <i>contextName</i>.<i>tableName</i>.  The returned map consists of
411 those attributes with the contextName and tableName stripped off.
412<P>
413<DD><DL>
414</DL>
415</DD>
416<DD><DL>
417</DL>
418</DD>
419</DL>
420<HR>
421
422<A NAME="getContextName()"><!-- --></A><H3>
423getContextName</H3>
424<PRE>
425public <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> <B>getContextName</B>()</PRE>
426<DL>
427<DD>Returns the context name.
428<P>
429<DD><DL>
430<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#getContextName()">getContextName</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
431</DD>
432<DD><DL>
433
434<DT><B>Returns:</B><DD>the context name</DL>
435</DD>
436</DL>
437<HR>
438
439<A NAME="getContextFactory()"><!-- --></A><H3>
440getContextFactory</H3>
441<PRE>
442public <A HREF="../../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A> <B>getContextFactory</B>()</PRE>
443<DL>
444<DD>Returns the factory by which this context was created.
445<P>
446<DD><DL>
447</DL>
448</DD>
449<DD><DL>
450</DL>
451</DD>
452</DL>
453<HR>
454
455<A NAME="startMonitoring()"><!-- --></A><H3>
456startMonitoring</H3>
457<PRE>
458public void <B>startMonitoring</B>()
459                     throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
460<DL>
461<DD>Starts or restarts monitoring, the emitting of metrics records.
462<P>
463<DD><DL>
464<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></DL>
465</DD>
466<DD><DL>
467
468<DT><B>Throws:</B>
469<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
470</DD>
471</DL>
472<HR>
473
474<A NAME="stopMonitoring()"><!-- --></A><H3>
475stopMonitoring</H3>
476<PRE>
477public void <B>stopMonitoring</B>()</PRE>
478<DL>
479<DD>Stops monitoring.  This does not free buffered data.
480<P>
481<DD><DL>
482<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#stopMonitoring()">stopMonitoring</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
483</DD>
484<DD><DL>
485<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html#close()"><CODE>close()</CODE></A></DL>
486</DD>
487</DL>
488<HR>
489
490<A NAME="isMonitoring()"><!-- --></A><H3>
491isMonitoring</H3>
492<PRE>
493public boolean <B>isMonitoring</B>()</PRE>
494<DL>
495<DD>Returns true if monitoring is currently in progress.
496<P>
497<DD><DL>
498<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#isMonitoring()">isMonitoring</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
499</DD>
500<DD><DL>
501</DL>
502</DD>
503</DL>
504<HR>
505
506<A NAME="close()"><!-- --></A><H3>
507close</H3>
508<PRE>
509public void <B>close</B>()</PRE>
510<DL>
511<DD>Stops monitoring and frees buffered data, returning this
512 object to its initial state.
513<P>
514<DD><DL>
515<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#close()">close</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
516</DD>
517<DD><DL>
518</DL>
519</DD>
520</DL>
521<HR>
522
523<A NAME="createRecord(java.lang.String)"><!-- --></A><H3>
524createRecord</H3>
525<PRE>
526public final <A HREF="../../../../../org/apache/hadoop/metrics/MetricsRecord.html" title="interface in org.apache.hadoop.metrics">MetricsRecord</A> <B>createRecord</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;recordName)</PRE>
527<DL>
528<DD>Creates a new AbstractMetricsRecord instance with the given <code>recordName</code>.
529 Throws an exception if the metrics implementation is configured with a fixed
530 set of record names and <code>recordName</code> is not in that set.
531<P>
532<DD><DL>
533<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#createRecord(java.lang.String)">createRecord</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
534</DD>
535<DD><DL>
536<DT><B>Parameters:</B><DD><CODE>recordName</CODE> - the name of the record
537<DT><B>Throws:</B>
538<DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsException.html" title="class in org.apache.hadoop.metrics">MetricsException</A></CODE> - if recordName conflicts with configuration data</DL>
539</DD>
540</DL>
541<HR>
542
543<A NAME="newRecord(java.lang.String)"><!-- --></A><H3>
544newRecord</H3>
545<PRE>
546protected <A HREF="../../../../../org/apache/hadoop/metrics/MetricsRecord.html" title="interface in org.apache.hadoop.metrics">MetricsRecord</A> <B>newRecord</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;recordName)</PRE>
547<DL>
548<DD>Subclasses should override this if they subclass MetricsRecordImpl.
549<P>
550<DD><DL>
551</DL>
552</DD>
553<DD><DL>
554<DT><B>Parameters:</B><DD><CODE>recordName</CODE> - the name of the record
555<DT><B>Returns:</B><DD>newly created instance of MetricsRecordImpl or subclass</DL>
556</DD>
557</DL>
558<HR>
559
560<A NAME="registerUpdater(org.apache.hadoop.metrics.Updater)"><!-- --></A><H3>
561registerUpdater</H3>
562<PRE>
563public void <B>registerUpdater</B>(<A HREF="../../../../../org/apache/hadoop/metrics/Updater.html" title="interface in org.apache.hadoop.metrics">Updater</A>&nbsp;updater)</PRE>
564<DL>
565<DD>Registers a callback to be called at time intervals determined by
566 the configuration.
567<P>
568<DD><DL>
569<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#registerUpdater(org.apache.hadoop.metrics.Updater)">registerUpdater</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
570</DD>
571<DD><DL>
572<DT><B>Parameters:</B><DD><CODE>updater</CODE> - object to be run periodically; it should update
573 some metrics records</DL>
574</DD>
575</DL>
576<HR>
577
578<A NAME="unregisterUpdater(org.apache.hadoop.metrics.Updater)"><!-- --></A><H3>
579unregisterUpdater</H3>
580<PRE>
581public void <B>unregisterUpdater</B>(<A HREF="../../../../../org/apache/hadoop/metrics/Updater.html" title="interface in org.apache.hadoop.metrics">Updater</A>&nbsp;updater)</PRE>
582<DL>
583<DD>Removes a callback, if it exists.
584<P>
585<DD><DL>
586<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#unregisterUpdater(org.apache.hadoop.metrics.Updater)">unregisterUpdater</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
587</DD>
588<DD><DL>
589<DT><B>Parameters:</B><DD><CODE>updater</CODE> - object to be removed from the callback list</DL>
590</DD>
591</DL>
592<HR>
593
594<A NAME="emitRecord(java.lang.String, java.lang.String, org.apache.hadoop.metrics.spi.OutputRecord)"><!-- --></A><H3>
595emitRecord</H3>
596<PRE>
597protected abstract 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,
598                                   <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,
599                                   <A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A>&nbsp;outRec)
600                            throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
601<DL>
602<DD>Sends a record to the metrics system.
603<P>
604<DD><DL>
605</DL>
606</DD>
607<DD><DL>
608
609<DT><B>Throws:</B>
610<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
611</DD>
612</DL>
613<HR>
614
615<A NAME="flush()"><!-- --></A><H3>
616flush</H3>
617<PRE>
618protected void <B>flush</B>()
619              throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
620<DL>
621<DD>Called each period after all records have been emitted, this method does nothing.
622 Subclasses may override it in order to perform some kind of flush.
623<P>
624<DD><DL>
625</DL>
626</DD>
627<DD><DL>
628
629<DT><B>Throws:</B>
630<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
631</DD>
632</DL>
633<HR>
634
635<A NAME="update(org.apache.hadoop.metrics.spi.MetricsRecordImpl)"><!-- --></A><H3>
636update</H3>
637<PRE>
638protected 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>
639<DL>
640<DD>Called by MetricsRecordImpl.update().  Creates or updates a row in
641 the internal table of metric data.
642<P>
643<DD><DL>
644</DL>
645</DD>
646<DD><DL>
647</DL>
648</DD>
649</DL>
650<HR>
651
652<A NAME="remove(org.apache.hadoop.metrics.spi.MetricsRecordImpl)"><!-- --></A><H3>
653remove</H3>
654<PRE>
655protected 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>
656<DL>
657<DD>Called by MetricsRecordImpl.remove().  Removes all matching rows in
658 the internal table of metric data.  A row matches if it has the same
659 tag names and values as record, but it may also have additional
660 tags.
661<P>
662<DD><DL>
663</DL>
664</DD>
665<DD><DL>
666</DL>
667</DD>
668</DL>
669<HR>
670
671<A NAME="getPeriod()"><!-- --></A><H3>
672getPeriod</H3>
673<PRE>
674public int <B>getPeriod</B>()</PRE>
675<DL>
676<DD>Returns the timer period.
677<P>
678<DD><DL>
679<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html#getPeriod()">getPeriod</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/metrics/MetricsContext.html" title="interface in org.apache.hadoop.metrics">MetricsContext</A></CODE></DL>
680</DD>
681<DD><DL>
682</DL>
683</DD>
684</DL>
685<HR>
686
687<A NAME="setPeriod(int)"><!-- --></A><H3>
688setPeriod</H3>
689<PRE>
690protected void <B>setPeriod</B>(int&nbsp;period)</PRE>
691<DL>
692<DD>Sets the timer period
693<P>
694<DD><DL>
695</DL>
696</DD>
697<DD><DL>
698</DL>
699</DD>
700</DL>
701<!-- ========= END OF CLASS DATA ========= -->
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