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      1 /*
      2  * Copyright (C) 2019 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package android.assist.common;
     18 
     19 import java.util.concurrent.CountDownLatch;
     20 import java.util.concurrent.TimeUnit;
     21 
     22 /**
     23  * A [CountDownLatch] that resets itself to [mCount] after every await call.
     24  */
     25 public class AutoResetLatch {
     26 
     27     private final int mCount;
     28     private CountDownLatch mLatch;
     29 
     30     public AutoResetLatch() {
     31         this(1);
     32     }
     33 
     34     public AutoResetLatch(int count) {
     35         mCount = count;
     36         mLatch = new CountDownLatch(count);
     37     }
     38 
     39     public void await() throws InterruptedException {
     40         try {
     41             mLatch.await();
     42         } finally {
     43             mLatch = new CountDownLatch(mCount);
     44         }
     45     }
     46 
     47     public boolean await(long timeout, TimeUnit unit) throws InterruptedException {
     48         try {
     49             return mLatch.await(timeout, unit);
     50         } finally {
     51             mLatch = new CountDownLatch(mCount);
     52         }
     53     }
     54 
     55     public void countDown() {
     56         mLatch.countDown();
     57     }
     58 }
     59