| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.internal.midi; |
| |
| import android.media.midi.MidiReceiver; |
| import android.media.midi.MidiSender; |
| |
| import java.io.IOException; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| |
| /** |
| * Utility class for dispatching MIDI data to a list of {@link android.media.midi.MidiReceiver}s. |
| * This class subclasses {@link android.media.midi.MidiReceiver} and dispatches any data it receives |
| * to its receiver list. Any receivers that throw an exception upon receiving data will |
| * be automatically removed from the receiver list, but no IOException will be returned |
| * from the dispatcher's {@link android.media.midi.MidiReceiver#onSend} in that case. |
| */ |
| public final class MidiDispatcher extends MidiReceiver { |
| |
| private final CopyOnWriteArrayList<MidiReceiver> mReceivers |
| = new CopyOnWriteArrayList<MidiReceiver>(); |
| |
| private final MidiSender mSender = new MidiSender() { |
| @Override |
| public void onConnect(MidiReceiver receiver) { |
| mReceivers.add(receiver); |
| } |
| |
| @Override |
| public void onDisconnect(MidiReceiver receiver) { |
| mReceivers.remove(receiver); |
| } |
| }; |
| |
| /** |
| * Returns the number of {@link android.media.midi.MidiReceiver}s this dispatcher contains. |
| * @return the number of receivers |
| */ |
| public int getReceiverCount() { |
| return mReceivers.size(); |
| } |
| |
| /** |
| * Returns a {@link android.media.midi.MidiSender} which is used to add and remove |
| * {@link android.media.midi.MidiReceiver}s |
| * to the dispatcher's receiver list. |
| * @return the dispatcher's MidiSender |
| */ |
| public MidiSender getSender() { |
| return mSender; |
| } |
| |
| @Override |
| public void onSend(byte[] msg, int offset, int count, long timestamp) throws IOException { |
| for (MidiReceiver receiver : mReceivers) { |
| try { |
| receiver.send(msg, offset, count, timestamp); |
| } catch (IOException e) { |
| // if the receiver fails we remove the receiver but do not propagate the exception |
| mReceivers.remove(receiver); |
| } |
| } |
| } |
| |
| @Override |
| public void onFlush() throws IOException { |
| for (MidiReceiver receiver : mReceivers) { |
| receiver.flush(); |
| } |
| } |
| } |