Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 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 | |
Mike Lockwood | d1b16fe | 2015-03-30 08:39:09 -0700 | [diff] [blame] | 17 | package com.android.internal.midi; |
| 18 | |
| 19 | import android.media.midi.MidiReceiver; |
| 20 | import android.media.midi.MidiSender; |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 21 | |
| 22 | import java.io.IOException; |
Mike Lockwood | be215dd | 2015-03-07 11:04:59 -0800 | [diff] [blame] | 23 | import java.util.concurrent.CopyOnWriteArrayList; |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 24 | |
| 25 | /** |
Mike Lockwood | d1b16fe | 2015-03-30 08:39:09 -0700 | [diff] [blame] | 26 | * Utility class for dispatching MIDI data to a list of {@link android.media.midi.MidiReceiver}s. |
| 27 | * This class subclasses {@link android.media.midi.MidiReceiver} and dispatches any data it receives |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 28 | * to its receiver list. Any receivers that throw an exception upon receiving data will |
| 29 | * be automatically removed from the receiver list, but no IOException will be returned |
Mike Lockwood | 7eb441c | 2015-05-12 13:32:16 -0700 | [diff] [blame] | 30 | * from the dispatcher's {@link android.media.midi.MidiReceiver#onSend} in that case. |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 31 | */ |
Mike Lockwood | be215dd | 2015-03-07 11:04:59 -0800 | [diff] [blame] | 32 | public final class MidiDispatcher extends MidiReceiver { |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 33 | |
Mike Lockwood | be215dd | 2015-03-07 11:04:59 -0800 | [diff] [blame] | 34 | private final CopyOnWriteArrayList<MidiReceiver> mReceivers |
| 35 | = new CopyOnWriteArrayList<MidiReceiver>(); |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 36 | |
| 37 | private final MidiSender mSender = new MidiSender() { |
Mike Lockwood | 7eb441c | 2015-05-12 13:32:16 -0700 | [diff] [blame] | 38 | @Override |
| 39 | public void onConnect(MidiReceiver receiver) { |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 40 | mReceivers.add(receiver); |
| 41 | } |
| 42 | |
Mike Lockwood | 7eb441c | 2015-05-12 13:32:16 -0700 | [diff] [blame] | 43 | @Override |
| 44 | public void onDisconnect(MidiReceiver receiver) { |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 45 | mReceivers.remove(receiver); |
| 46 | } |
| 47 | }; |
| 48 | |
| 49 | /** |
Mike Lockwood | d1b16fe | 2015-03-30 08:39:09 -0700 | [diff] [blame] | 50 | * Returns the number of {@link android.media.midi.MidiReceiver}s this dispatcher contains. |
Mike Lockwood | 5ff9e2a | 2015-03-09 12:00:20 -0700 | [diff] [blame] | 51 | * @return the number of receivers |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 52 | */ |
Mike Lockwood | 5ff9e2a | 2015-03-09 12:00:20 -0700 | [diff] [blame] | 53 | public int getReceiverCount() { |
| 54 | return mReceivers.size(); |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | /** |
Mike Lockwood | d1b16fe | 2015-03-30 08:39:09 -0700 | [diff] [blame] | 58 | * Returns a {@link android.media.midi.MidiSender} which is used to add and remove |
| 59 | * {@link android.media.midi.MidiReceiver}s |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 60 | * to the dispatcher's receiver list. |
| 61 | * @return the dispatcher's MidiSender |
| 62 | */ |
| 63 | public MidiSender getSender() { |
| 64 | return mSender; |
| 65 | } |
| 66 | |
| 67 | @Override |
Mike Lockwood | 7eb441c | 2015-05-12 13:32:16 -0700 | [diff] [blame] | 68 | public void onSend(byte[] msg, int offset, int count, long timestamp) throws IOException { |
Mike Lockwood | be215dd | 2015-03-07 11:04:59 -0800 | [diff] [blame] | 69 | for (MidiReceiver receiver : mReceivers) { |
| 70 | try { |
Mike Lockwood | 7eb441c | 2015-05-12 13:32:16 -0700 | [diff] [blame] | 71 | receiver.send(msg, offset, count, timestamp); |
Mike Lockwood | be215dd | 2015-03-07 11:04:59 -0800 | [diff] [blame] | 72 | } catch (IOException e) { |
Mike Lockwood | 0c7342f | 2015-03-09 15:03:11 -0700 | [diff] [blame] | 73 | // if the receiver fails we remove the receiver but do not propagate the exception |
Mike Lockwood | be215dd | 2015-03-07 11:04:59 -0800 | [diff] [blame] | 74 | mReceivers.remove(receiver); |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 75 | } |
| 76 | } |
| 77 | } |
Mike Lockwood | b6f50d3 | 2015-04-08 08:45:37 -0700 | [diff] [blame] | 78 | |
| 79 | @Override |
Mike Lockwood | 7eb441c | 2015-05-12 13:32:16 -0700 | [diff] [blame] | 80 | public void onFlush() throws IOException { |
Mike Lockwood | b6f50d3 | 2015-04-08 08:45:37 -0700 | [diff] [blame] | 81 | for (MidiReceiver receiver : mReceivers) { |
| 82 | receiver.flush(); |
| 83 | } |
| 84 | } |
Mike Lockwood | 11fd96d | 2015-03-02 12:07:49 -0800 | [diff] [blame] | 85 | } |