tajo-common/src/main/java/org/apache/tajo/common/Sleeper.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.tajo.common;

public class Sleeper {
  private long before;
  private long cur;

  public Sleeper() {
    before = -1;
  }

  public void sleep(long time) throws InterruptedException {
    long sleeptime;
    cur = System.currentTimeMillis();
    if (before == -1) {
      sleeptime = time;
    } else {
      sleeptime = time - (cur - before);
    }
    if (sleeptime > 0) {
      Thread.sleep(sleeptime);
    }
    before = System.currentTimeMillis();
  }
}