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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.metrics;
import com.codahale.metrics.Counter;
import com.codahale.metrics.Gauge;
import org.apache.cassandra.concurrent.SEPExecutor;
import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
public class SEPMetrics
{
/** Number of active tasks. */
public final Gauge activeTasks;
/** Number of tasks that had blocked before being accepted (or rejected). */
public final Counter totalBlocked;
/**
* Number of tasks currently blocked, waiting to be accepted by
* the executor (because all threads are busy and the backing queue is full).
*/
public final Counter currentBlocked;
/** Number of completed tasks. */
public final Gauge completedTasks;
/** Number of tasks waiting to be executed. */
public final Gauge pendingTasks;
/** Maximum number of threads before it will start queuing tasks */
public final Gauge maxPoolSize;
private MetricNameFactory factory;
/**
* Create metrics for the given LowSignalExecutor.
*
* @param executor Thread pool
* @param path Type of thread pool
* @param poolName Name of thread pool to identify metrics
*/
public SEPMetrics(final SEPExecutor executor, String path, String poolName)
{
this.factory = new ThreadPoolMetricNameFactory("ThreadPools", path, poolName);
activeTasks = Metrics.register(factory.createMetricName("ActiveTasks"), new Gauge()
{
public Integer getValue()
{
return executor.getActiveCount();
}
});
pendingTasks = Metrics.register(factory.createMetricName("PendingTasks"), new Gauge()
{
public Long getValue()
{
return executor.getPendingTasks();
}
});
totalBlocked = Metrics.counter(factory.createMetricName("TotalBlockedTasks"));
currentBlocked = Metrics.counter(factory.createMetricName("CurrentlyBlockedTasks"));
completedTasks = Metrics.register(factory.createMetricName("CompletedTasks"), new Gauge()
{
public Long getValue()
{
return executor.getCompletedTasks();
}
});
maxPoolSize = Metrics.register(factory.createMetricName("MaxPoolSize"), new Gauge()
{
public Integer getValue()
{
return executor.maxWorkers;
}
});
}
public void release()
{
Metrics.remove(factory.createMetricName("ActiveTasks"));
Metrics.remove(factory.createMetricName("PendingTasks"));
Metrics.remove(factory.createMetricName("CompletedTasks"));
Metrics.remove(factory.createMetricName("TotalBlockedTasks"));
Metrics.remove(factory.createMetricName("CurrentlyBlockedTasks"));
Metrics.remove(factory.createMetricName("MaxPoolSize"));
}
}