Examples of org.apache.hadoop.metrics.spi.AbstractMetricsContext

org.apache.hadoop.metrics.spi.AbstractMetricsContext
The main class of the Service Provider Interface. This class should be extended in order to integrate the Metrics API with a specific metrics client library.
This class implements the internal table of metric data, and the timer on which data is to be sent to the metrics system. Subclasses must override the abstract emitRecord method in order to transmit the data.

     * @return the named MetricsContext
     */
    public synchronized MetricsContext getContext(String contextName) 
        throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException
    {
        AbstractMetricsContext metricsContext = contextMap.get(contextName);
        if (metricsContext == null) {
            String classNameAttribute = contextName + CONTEXT_CLASS_SUFFIX;
            String className = (String) getAttribute(classNameAttribute);
            if (className == null) {
                className = DEFAULT_CONTEXT_CLASSNAME;
            }
            Class contextClass = Class.forName(className);
            metricsContext = (AbstractMetricsContext) contextClass.newInstance();
            metricsContext.init(contextName, this);
            contextMap.put(contextName, metricsContext);
        }
        return metricsContext;
    }

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        String className = (String) getAttribute(classNameAttribute);
        if (className == null) {
            className = DEFAULT_CONTEXT_CLASSNAME;
        }
        Class contextClass = Class.forName(className);
        AbstractMetricsContext metricsContext = 
                (AbstractMetricsContext) contextClass.newInstance();
        metricsContext.init(contextName, this);
        contextMap.put(contextName, metricsContext);
        return metricsContext;
    }

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        String className = (String) getAttribute(classNameAttribute);
        if (className == null) {
            className = DEFAULT_CONTEXT_CLASSNAME;
        }
        Class contextClass = Class.forName(className);
        AbstractMetricsContext metricsContext = 
                (AbstractMetricsContext) contextClass.newInstance();
        metricsContext.init(contextName, this);
        return metricsContext;
    }

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        String className = (String) getAttribute(classNameAttribute);
        if (className == null) {
            className = DEFAULT_CONTEXT_CLASSNAME;
        }
        Class contextClass = Class.forName(className);
        AbstractMetricsContext metricsContext = 
                (AbstractMetricsContext) contextClass.newInstance();
        metricsContext.init(contextName, this);
        return metricsContext;
    }

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   * @return the named MetricsContext
   */
  public synchronized MetricsContext getContext(String contextName) 
    throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException
  {
    AbstractMetricsContext metricsContext = contextMap.get(contextName);
    if (metricsContext == null) {
      String classNameAttribute = contextName + CONTEXT_CLASS_SUFFIX;
      String className = (String) getAttribute(classNameAttribute);
      if (className == null) {
        className = DEFAULT_CONTEXT_CLASSNAME;
      }
      Class contextClass = Class.forName(className);
      metricsContext = (AbstractMetricsContext) contextClass.newInstance();
      metricsContext.init(contextName, this);
      contextMap.put(contextName, metricsContext);
    }
    return metricsContext;
  }

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public class TestGangliaContext {
  
  @Test
  public void testCloseShouldCloseTheSocketWhichIsCreatedByInit() throws Exception {
    AbstractMetricsContext context=new GangliaContext();
    context.init("gangliaContext", ContextFactory.getFactory());
    GangliaContext gangliaContext =(GangliaContext) context;
    assertFalse("Socket already closed",gangliaContext.datagramSocket.isClosed());
    context.close();
    assertTrue("Socket not closed",gangliaContext.datagramSocket.isClosed());
  }

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Related Classes of org.apache.hadoop.metrics.spi.AbstractMetricsContext

org.apache.hadoop.metrics.ContextFactory

org.apache.hadoop.metrics.ganglia.TestGangliaContext

org.apache.hadoop.metrics.Updater

org.apache.hadoop.metrics.MetricsException

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