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 com.alibaba.jstorm.utils;
  
  import java.io.Serializable;
  
  public class IntervalCheck implements Serializable {
      private static final long serialVersionUID = 8952971673547362883L;
  
      long lastCheck = 0;
  
      // default interval is 1 second
      long interval = 1000;
  
      /*
       * if last check time is before interval seconds, return true, otherwise return false
       */
      public boolean check() {
          return checkAndGet() != null;
      }
  
      public Double checkAndGet() {
          long now = System.currentTimeMillis();
  
          synchronized (this) {
              if (now >= interval + lastCheck) {
                  double pastSecond = ((double) (now - lastCheck)) / 1000;
                  lastCheck = now;
                  return pastSecond;
              }
          }
  
          return null;
      }
  
      public long getInterval() {
          return interval / 1000;
      }
  
      public long getIntervalMs() {
          return interval;
      }
  
      public void setInterval(long interval) {
          this.interval = interval * 1000;
      }
  
      public void setIntervalMs(long interval) {
          this.interval = interval;
      }
  
      public void adjust(long addTimeMillis) {
          lastCheck += addTimeMillis;
      }
  
      public boolean isStart() {
          return lastCheck != 0;
      }
  
      public void start() {
          lastCheck = System.currentTimeMillis();
      }
  
      public long getLaskCheckTime() {
          return lastCheck;
      }
  }
  