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      1 /*
      2  * Copyright (C) 2017 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 package com.android.launcher3.util;
     17 
     18 import android.os.Handler;
     19 import android.os.Looper;
     20 
     21 import java.util.List;
     22 import java.util.concurrent.AbstractExecutorService;
     23 import java.util.concurrent.TimeUnit;
     24 
     25 /**
     26  * Extension of {@link AbstractExecutorService} which executed on a provided looper.
     27  */
     28 public class LooperExecutor extends AbstractExecutorService {
     29 
     30     private final Handler mHandler;
     31 
     32     public LooperExecutor(Looper looper) {
     33         mHandler = new Handler(looper);
     34     }
     35 
     36     public Handler getHandler() {
     37         return mHandler;
     38     }
     39 
     40     @Override
     41     public void execute(Runnable runnable) {
     42         if (mHandler.getLooper() == Looper.myLooper()) {
     43             runnable.run();
     44         } else {
     45             mHandler.post(runnable);
     46         }
     47     }
     48 
     49     /**
     50      * Not supported and throws an exception when used.
     51      */
     52     @Override
     53     @Deprecated
     54     public void shutdown() {
     55         throw new UnsupportedOperationException();
     56     }
     57 
     58     /**
     59      * Not supported and throws an exception when used.
     60      */
     61     @Override
     62     @Deprecated
     63     public List<Runnable> shutdownNow() {
     64         throw new UnsupportedOperationException();
     65     }
     66 
     67     @Override
     68     public boolean isShutdown() {
     69         return false;
     70     }
     71 
     72     @Override
     73     public boolean isTerminated() {
     74         return false;
     75     }
     76 
     77     /**
     78      * Not supported and throws an exception when used.
     79      */
     80     @Override
     81     @Deprecated
     82     public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
     83         throw new UnsupportedOperationException();
     84     }
     85 }
     86