org.apache.cassandra.metrics

Class ThreadPoolMetrics

java.lang.Object

org.apache.cassandra.metrics.ThreadPoolMetrics

public class ThreadPoolMetrics
extends java.lang.Object

Metrics for ThreadPoolExecutor.

Field Summary

Fields

Modifier and Type	Field and Description
com.codahale.metrics.Gauge<java.lang.Integer>	activeTasks Number of active tasks.
com.codahale.metrics.Gauge<java.lang.Long>	completedTasks Number of completed tasks.
com.codahale.metrics.Counter	currentBlocked Number of tasks currently blocked, waiting to be accepted by the executor (because all threads are busy and the backing queue is full).
com.codahale.metrics.Gauge<java.lang.Integer>	maxPoolSize Maximum number of threads before it will start queuing tasks
com.codahale.metrics.Gauge<java.lang.Long>	pendingTasks Number of tasks waiting to be executed.
com.codahale.metrics.Counter	totalBlocked Number of tasks that had blocked before being accepted (or rejected).

Constructor Summary

Constructors

Constructor and Description
ThreadPoolMetrics(java.util.concurrent.ThreadPoolExecutor executor, java.lang.String path, java.lang.String poolName) Create metrics for given ThreadPoolExecutor.

Method Summary

Modifier and Type	Method and Description
static java.lang.Object	getJmxMetric(javax.management.MBeanServerConnection mbeanServerConn, java.lang.String jmxPath, java.lang.String poolName, java.lang.String metricName)
static com.google.common.collect.Multimap<java.lang.String,java.lang.String>	getJmxThreadPools(javax.management.MBeanServerConnection mbeanServerConn)
void	release()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

activeTasks

public final com.codahale.metrics.Gauge<java.lang.Integer> activeTasks

Number of active tasks.

totalBlocked

public final com.codahale.metrics.Counter totalBlocked

Number of tasks that had blocked before being accepted (or rejected).

currentBlocked

public final com.codahale.metrics.Counter currentBlocked

Number of tasks currently blocked, waiting to be accepted by the executor (because all threads are busy and the backing queue is full).

completedTasks

public final com.codahale.metrics.Gauge<java.lang.Long> completedTasks

Number of completed tasks.

pendingTasks

public final com.codahale.metrics.Gauge<java.lang.Long> pendingTasks

Number of tasks waiting to be executed.

maxPoolSize

public final com.codahale.metrics.Gauge<java.lang.Integer> maxPoolSize

Maximum number of threads before it will start queuing tasks

Constructor Detail

ThreadPoolMetrics

public ThreadPoolMetrics(java.util.concurrent.ThreadPoolExecutor executor,
                         java.lang.String path,
                         java.lang.String poolName)

Create metrics for given ThreadPoolExecutor.

Parameters:

executor - Thread pool

path - Type of thread pool

poolName - Name of thread pool to identify metrics

Method Detail

release

public void release()

getJmxMetric

public static java.lang.Object getJmxMetric(javax.management.MBeanServerConnection mbeanServerConn,
                                            java.lang.String jmxPath,
                                            java.lang.String poolName,
                                            java.lang.String metricName)

getJmxThreadPools

public static com.google.common.collect.Multimap<java.lang.String,java.lang.String> getJmxThreadPools(javax.management.MBeanServerConnection mbeanServerConn)