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7MetricsContext (Hadoop 0.20.1 API)
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;CONSTR&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
80<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
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89<H2>
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91org.apache.hadoop.metrics</FONT>
92<BR>
93Interface MetricsContext</H2>
94<DL>
95<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A>, <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>
96</DL>
97<HR>
98<DL>
99<DT><PRE>public interface <B>MetricsContext</B></DL>
100</PRE>
101
102<P>
103The main interface to the metrics package.
104<P>
105
106<P>
107<HR>
108
109<P>
110<!-- =========== FIELD SUMMARY =========== -->
111
112<A NAME="field_summary"><!-- --></A>
113<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
114<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
115<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
116<B>Field Summary</B></FONT></TH>
117</TR>
118<TR BGCOLOR="white" CLASS="TableRowColor">
119<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
120<CODE>static&nbsp;int</CODE></FONT></TD>
121<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#DEFAULT_PERIOD">DEFAULT_PERIOD</A></B></CODE>
122
123<BR>
124&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Default period in seconds at which data is sent to the metrics system.</TD>
125</TR>
126</TABLE>
127&nbsp;
128<!-- ========== METHOD SUMMARY =========== -->
129
130<A NAME="method_summary"><!-- --></A>
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133<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
134<B>Method Summary</B></FONT></TH>
135</TR>
136<TR BGCOLOR="white" CLASS="TableRowColor">
137<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
138<CODE>&nbsp;void</CODE></FONT></TD>
139<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#close()">close</A></B>()</CODE>
140
141<BR>
142&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stops monitoring and also frees any buffered data, returning this
143 object to its initial state.</TD>
144</TR>
145<TR BGCOLOR="white" CLASS="TableRowColor">
146<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
147<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/metrics/MetricsRecord.html" title="interface in org.apache.hadoop.metrics">MetricsRecord</A></CODE></FONT></TD>
148<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.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>
149
150<BR>
151&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new MetricsRecord instance with the given <code>recordName</code>.</TD>
152</TR>
153<TR BGCOLOR="white" CLASS="TableRowColor">
154<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
155<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>
156<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#getContextName()">getContextName</A></B>()</CODE>
157
158<BR>
159&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the context name.</TD>
160</TR>
161<TR BGCOLOR="white" CLASS="TableRowColor">
162<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
163<CODE>&nbsp;int</CODE></FONT></TD>
164<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#getPeriod()">getPeriod</A></B>()</CODE>
165
166<BR>
167&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the timer period.</TD>
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/MetricsContext.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,
173     <A HREF="../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A>&nbsp;factory)</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initialize this context.</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;boolean</CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#isMonitoring()">isMonitoring</A></B>()</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns true if monitoring is currently in progress.</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>&nbsp;void</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.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>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Registers a callback to be called at regular time intervals, as
193 determined by the implementation-class specific configuration.</TD>
194</TR>
195<TR BGCOLOR="white" CLASS="TableRowColor">
196<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
197<CODE>&nbsp;void</CODE></FONT></TD>
198<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#startMonitoring()">startMonitoring</A></B>()</CODE>
199
200<BR>
201&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Starts or restarts monitoring, the emitting of metrics records as they are
202 updated.</TD>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
206<CODE>&nbsp;void</CODE></FONT></TD>
207<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#stopMonitoring()">stopMonitoring</A></B>()</CODE>
208
209<BR>
210&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stops monitoring.</TD>
211</TR>
212<TR BGCOLOR="white" CLASS="TableRowColor">
213<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
214<CODE>&nbsp;void</CODE></FONT></TD>
215<TD><CODE><B><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.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>
216
217<BR>
218&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes a callback, if it exists.</TD>
219</TR>
220</TABLE>
221&nbsp;
222<P>
223
224<!-- ============ FIELD DETAIL =========== -->
225
226<A NAME="field_detail"><!-- --></A>
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228<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
229<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
230<B>Field Detail</B></FONT></TH>
231</TR>
232</TABLE>
233
234<A NAME="DEFAULT_PERIOD"><!-- --></A><H3>
235DEFAULT_PERIOD</H3>
236<PRE>
237static final int <B>DEFAULT_PERIOD</B></PRE>
238<DL>
239<DD>Default period in seconds at which data is sent to the metrics system.
240<P>
241<DL>
242<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.metrics.MetricsContext.DEFAULT_PERIOD">Constant Field Values</A></DL>
243</DL>
244
245<!-- ============ METHOD DETAIL ========== -->
246
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250<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
251<B>Method Detail</B></FONT></TH>
252</TR>
253</TABLE>
254
255<A NAME="init(java.lang.String, org.apache.hadoop.metrics.ContextFactory)"><!-- --></A><H3>
256init</H3>
257<PRE>
258void <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,
259          <A HREF="../../../../org/apache/hadoop/metrics/ContextFactory.html" title="class in org.apache.hadoop.metrics">ContextFactory</A>&nbsp;factory)</PRE>
260<DL>
261<DD>Initialize this context.
262<P>
263<DD><DL>
264<DT><B>Parameters:</B><DD><CODE>contextName</CODE> - The given name for this context<DD><CODE>factory</CODE> - The creator of this context</DL>
265</DD>
266</DL>
267<HR>
268
269<A NAME="getContextName()"><!-- --></A><H3>
270getContextName</H3>
271<PRE>
272<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>
273<DL>
274<DD>Returns the context name.
275<P>
276<DD><DL>
277
278<DT><B>Returns:</B><DD>the context name</DL>
279</DD>
280</DL>
281<HR>
282
283<A NAME="startMonitoring()"><!-- --></A><H3>
284startMonitoring</H3>
285<PRE>
286void <B>startMonitoring</B>()
287                     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>
288<DL>
289<DD>Starts or restarts monitoring, the emitting of metrics records as they are
290 updated.
291<P>
292<DD><DL>
293
294<DT><B>Throws:</B>
295<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>
296</DD>
297</DL>
298<HR>
299
300<A NAME="stopMonitoring()"><!-- --></A><H3>
301stopMonitoring</H3>
302<PRE>
303void <B>stopMonitoring</B>()</PRE>
304<DL>
305<DD>Stops monitoring.  This does not free any data that the implementation
306 may have buffered for sending at the next timer event. It
307 is OK to call <code>startMonitoring()</code> again after calling
308 this.
309<P>
310<DD><DL>
311<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/metrics/MetricsContext.html#close()"><CODE>close()</CODE></A></DL>
312</DD>
313</DL>
314<HR>
315
316<A NAME="isMonitoring()"><!-- --></A><H3>
317isMonitoring</H3>
318<PRE>
319boolean <B>isMonitoring</B>()</PRE>
320<DL>
321<DD>Returns true if monitoring is currently in progress.
322<P>
323<DD><DL>
324</DL>
325</DD>
326</DL>
327<HR>
328
329<A NAME="close()"><!-- --></A><H3>
330close</H3>
331<PRE>
332void <B>close</B>()</PRE>
333<DL>
334<DD>Stops monitoring and also frees any buffered data, returning this
335 object to its initial state.
336<P>
337<DD><DL>
338</DL>
339</DD>
340</DL>
341<HR>
342
343<A NAME="createRecord(java.lang.String)"><!-- --></A><H3>
344createRecord</H3>
345<PRE>
346<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>
347<DL>
348<DD>Creates a new MetricsRecord instance with the given <code>recordName</code>.
349 Throws an exception if the metrics implementation is configured with a fixed
350 set of record names and <code>recordName</code> is not in that set.
351<P>
352<DD><DL>
353<DT><B>Parameters:</B><DD><CODE>recordName</CODE> - the name of the record
354<DT><B>Throws:</B>
355<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>
356</DD>
357</DL>
358<HR>
359
360<A NAME="registerUpdater(org.apache.hadoop.metrics.Updater)"><!-- --></A><H3>
361registerUpdater</H3>
362<PRE>
363void <B>registerUpdater</B>(<A HREF="../../../../org/apache/hadoop/metrics/Updater.html" title="interface in org.apache.hadoop.metrics">Updater</A>&nbsp;updater)</PRE>
364<DL>
365<DD>Registers a callback to be called at regular time intervals, as
366 determined by the implementation-class specific configuration.
367<P>
368<DD><DL>
369<DT><B>Parameters:</B><DD><CODE>updater</CODE> - object to be run periodically; it should updated
370 some metrics records and then return</DL>
371</DD>
372</DL>
373<HR>
374
375<A NAME="unregisterUpdater(org.apache.hadoop.metrics.Updater)"><!-- --></A><H3>
376unregisterUpdater</H3>
377<PRE>
378void <B>unregisterUpdater</B>(<A HREF="../../../../org/apache/hadoop/metrics/Updater.html" title="interface in org.apache.hadoop.metrics">Updater</A>&nbsp;updater)</PRE>
379<DL>
380<DD>Removes a callback, if it exists.
381<P>
382<DD><DL>
383<DT><B>Parameters:</B><DD><CODE>updater</CODE> - object to be removed from the callback list</DL>
384</DD>
385</DL>
386<HR>
387
388<A NAME="getPeriod()"><!-- --></A><H3>
389getPeriod</H3>
390<PRE>
391int <B>getPeriod</B>()</PRE>
392<DL>
393<DD>Returns the timer period.
394<P>
395<DD><DL>
396</DL>
397</DD>
398</DL>
399<!-- ========= END OF CLASS DATA ========= -->
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