1 /* 2 * Copyright (C) 2015 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 com.example.android.common.midi; 18 19 import android.media.midi.MidiSender; 20 import android.util.Log; 21 22 import java.io.IOException; 23 24 public class MidiEventThread extends MidiEventScheduler { 25 protected static final String TAG = "MidiEventThread"; 26 27 private EventThread mEventThread; 28 MidiDispatcher mDispatcher = new MidiDispatcher(); 29 30 class EventThread extends Thread { 31 private boolean go = true; 32 33 @Override run()34 public void run() { 35 while (go) { 36 try { 37 MidiEvent event = (MidiEvent) waitNextEvent(); 38 try { 39 Log.i(TAG, "Fire event " + event.data[0] + " at " 40 + event.getTimestamp()); 41 mDispatcher.send(event.data, 0, 42 event.count, event.getTimestamp()); 43 } catch (IOException e) { 44 e.printStackTrace(); 45 } 46 // Put event back in the pool for future use. 47 addEventToPool(event); 48 } catch (InterruptedException e) { 49 // OK, this is how we stop the thread. 50 } 51 } 52 } 53 54 /** 55 * Asynchronously tell the thread to stop. 56 */ requestStop()57 public void requestStop() { 58 go = false; 59 interrupt(); 60 } 61 } 62 start()63 public void start() { 64 stop(); 65 mEventThread = new EventThread(); 66 mEventThread.start(); 67 } 68 69 /** 70 * Asks the thread to stop then waits for it to stop. 71 */ stop()72 public void stop() { 73 if (mEventThread != null) { 74 mEventThread.requestStop(); 75 try { 76 mEventThread.join(500); 77 } catch (InterruptedException e) { 78 Log.e(TAG, 79 "Interrupted while waiting for MIDI EventScheduler thread to stop."); 80 } finally { 81 mEventThread = null; 82 } 83 } 84 } 85 getSender()86 public MidiSender getSender() { 87 return mDispatcher.getSender(); 88 } 89 90 } 91