ElapsedTimeLoggingWrapper.java

/**
 * 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.hadoop.hive.util;

import java.util.concurrent.TimeUnit;

import com.google.common.base.Stopwatch;
import org.slf4j.Logger;

public abstract class ElapsedTimeLoggingWrapper<T> {

  public abstract T invokeInternal() throws Exception;

  public T invoke(String message, Logger LOG, boolean toStdErr) throws Exception {
    Stopwatch sw = new Stopwatch().start();
    try {
      T retVal = invokeInternal();
      return retVal;
    } finally {
      String logMessage = message + " ElapsedTime(ms)=" + sw.stop().elapsed(TimeUnit.MILLISECONDS);
      LOG.info(logMessage);
      if (toStdErr) {
        System.err.println(logMessage);
      }
    }
  }
}