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A common base library for Apache Accumulo servers.

There is a newer version: 3.0.0

/*
 * 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.accumulo.server.rpc;

import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.server.metrics.Metrics;
import org.apache.accumulo.server.metrics.MetricsFactory;
import org.apache.accumulo.server.metrics.ThriftMetrics;
import org.apache.thrift.TException;
import org.apache.thrift.TProcessor;
import org.apache.thrift.protocol.TProtocol;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A {@link TProcessor} which tracks the duration of an RPC and adds it to the metrics subsystem.
 */
public class TimedProcessor implements TProcessor {
  private static final Logger log = LoggerFactory.getLogger(TimedProcessor.class);

  private final TProcessor other;
  private final Metrics metrics;
  private long idleStart = 0;

  public TimedProcessor(AccumuloConfiguration conf, TProcessor next, String serverName, String threadName) {
    this(new MetricsFactory(conf), next, serverName, threadName);
  }

  public TimedProcessor(MetricsFactory factory, TProcessor next, String serverName, String threadName) {
    this.other = next;
    metrics = factory.createThriftMetrics(serverName, threadName);
    try {
      metrics.register();
    } catch (Exception e) {
      log.error("Exception registering MBean with MBean Server", e);
    }
    idleStart = System.currentTimeMillis();
  }

  @Override
  public boolean process(TProtocol in, TProtocol out) throws TException {
    long now = 0;
    final boolean metricsEnabled = metrics.isEnabled();
    if (metricsEnabled) {
      now = System.currentTimeMillis();
      metrics.add(ThriftMetrics.idle, (now - idleStart));
    }
    try {
      return other.process(in, out);
    } finally {
      if (metricsEnabled) {
        idleStart = System.currentTimeMillis();
        metrics.add(ThriftMetrics.execute, idleStart - now);
      }
    }
  }
}