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/*
* 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();
}
}
}
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