content: /*
   * 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.Gauge;
  import com.codahale.metrics.Meter;
  import com.codahale.metrics.Timer;
  import org.apache.cassandra.db.commitlog.AbstractCommitLogService;
  import org.apache.cassandra.db.commitlog.AbstractCommitLogSegmentManager;
  
  import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
  
  /**
   * Metrics for commit log
   */
  public class CommitLogMetrics
  {
      public static final String TYPE_NAME = "CommitLog";
      public static final MetricNameFactory factory = new DefaultNameFactory(TYPE_NAME);
  
      /** Number of completed tasks */
      public Gauge<Long> completedTasks;
      /** Number of pending tasks */
      public Gauge<Long> pendingTasks;
      /** Current size used by all the commit log segments */
      public Gauge<Long> totalCommitLogSize;
      /** Time spent waiting for a CLS to be allocated - under normal conditions this should be zero */
      public final Timer waitingOnSegmentAllocation;
      /** The time spent waiting on CL sync; for Periodic this is only occurs when the sync is lagging its sync interval */
      public final Timer waitingOnCommit;
      /** Time spent actually flushing the contents of a buffer to disk */
      public final Timer waitingOnFlush;
      /** Number and rate of oversized mutations */
      public final Meter oversizedMutations;
  
      public CommitLogMetrics()
      {
          waitingOnSegmentAllocation = Metrics.timer(factory.createMetricName("WaitingOnSegmentAllocation"));
          waitingOnCommit = Metrics.timer(factory.createMetricName("WaitingOnCommit"));
          waitingOnFlush = Metrics.timer(factory.createMetricName("WaitingOnFlush"));
          oversizedMutations = Metrics.meter(factory.createMetricName("OverSizedMutations"));
      }
  
      public void attach(final AbstractCommitLogService service, final AbstractCommitLogSegmentManager segmentManager)
      {
          completedTasks = Metrics.register(factory.createMetricName("CompletedTasks"), new Gauge<Long>()
          {
              public Long getValue()
              {
                  return service.getCompletedTasks();
              }
          });
          pendingTasks = Metrics.register(factory.createMetricName("PendingTasks"), new Gauge<Long>()
          {
              public Long getValue()
              {
                  return service.getPendingTasks();
              }
          });
          totalCommitLogSize = Metrics.register(factory.createMetricName("TotalCommitLogSize"), new Gauge<Long>()
          {
              public Long getValue()
              {
                  return segmentManager.onDiskSize();
              }
          });
      }
  }
  