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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to you under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    * http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.hadoop.hbase.client;
18  
19  import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
20  
21  /**
22   * Tracks the amount of time remaining for an operation.
23   */
24  class RetryingTimeTracker {
25  
26    private long globalStartTime = -1;
27  
28    public void start() {
29      if (this.globalStartTime < 0) {
30        this.globalStartTime = EnvironmentEdgeManager.currentTimeMillis();
31      }
32    }
33  
34    public int getRemainingTime(int callTimeout) {
35      if (callTimeout <= 0) {
36        return 0;
37      } else {
38        if (callTimeout == Integer.MAX_VALUE) {
39          return Integer.MAX_VALUE;
40        }
41        int remainingTime = (int) (
42          callTimeout -
43          (EnvironmentEdgeManager.currentTimeMillis() - this.globalStartTime));
44        if (remainingTime < 1) {
45          // If there is no time left, we're trying anyway. It's too late.
46          // 0 means no timeout, and it's not the intent here. So we secure both cases by
47          // resetting to the minimum.
48          remainingTime = 1;
49        }
50        return remainingTime;
51      }
52    }
53  
54    public long getStartTime() {
55      return this.globalStartTime;
56    }
57  }