1 /* 2 * Copyright (C) 2014 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.tradefed.util; 17 18 import java.io.IOException; 19 import java.net.Socket; 20 import java.util.ArrayList; 21 import java.util.List; 22 23 /** 24 * A thread which waits for a period of time and then interrupts a specific other thread. 25 * Can call {@link Thread#interrupt()} to get a thread out of a blocking wait, or 26 * {@link Socket#close()} to stop a thread from blocking on a socket read or write. 27 * <p/> 28 * All time units are in milliseconds. 29 */ 30 public class Alarm extends Thread { 31 private final List<Thread> mInterruptThreads = new ArrayList<Thread>(); 32 private final List<Socket> mInterruptSockets = new ArrayList<Socket>(); 33 private final long mTimeoutTime; 34 private boolean mAlarmFired = false; 35 36 /** 37 * Constructor takes the amount of time to wait, in millis. 38 * 39 * @param timeout The amount of time to wait, in millis 40 * @throws IllegalArgumentException if {@code timeout <= 0}. 41 */ 42 public Alarm(long timeout) { 43 setName(getClass().getCanonicalName()); 44 setDaemon(true); 45 46 if (timeout <= 0) { 47 throw new IllegalArgumentException(String.format( 48 "Alarm timeout time %d <= 0, which is not valid.", timeout)); 49 } 50 51 mTimeoutTime = timeout; 52 } 53 54 public void addThread(Thread intThread) { 55 mInterruptThreads.add(intThread); 56 } 57 58 public void addSocket(Socket intSocket) { 59 mInterruptSockets.add(intSocket); 60 } 61 62 public boolean didAlarmFire() { 63 return mAlarmFired; 64 } 65 66 @Override 67 public void run() { 68 try { 69 Thread.sleep(mTimeoutTime); 70 } catch (InterruptedException e) { 71 // Expected; return without interrupt()ing any of our InterruptThreads 72 return; 73 } 74 mAlarmFired = true; 75 for (Socket sock : mInterruptSockets) { 76 try { 77 sock.close(); 78 } catch (IOException e) { 79 // ignore 80 } 81 } 82 for (Thread thread : mInterruptThreads) { 83 thread.interrupt(); 84 } 85 } 86 } 87 88