119 lines
4.2 KiB
Java
119 lines
4.2 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.midi;
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import android.media.midi.MidiReceiver;
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import android.media.midi.MidiSender;
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import java.io.IOException;
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import java.util.concurrent.CopyOnWriteArrayList;
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/**
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* Utility class for dispatching MIDI data to a list of {@link android.media.midi.MidiReceiver}s.
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* This class subclasses {@link android.media.midi.MidiReceiver} and dispatches any data it receives
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* to its receiver list. Any receivers that throw an exception upon receiving data will
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* be automatically removed from the receiver list. If a MidiReceiverFailureHandler has been
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* provided to the MidiDispatcher, it will be notified about the failure, but the exception
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* itself will be swallowed.
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*/
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public final class MidiDispatcher extends MidiReceiver {
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// MidiDispatcher's client and MidiReceiver's owner can be different
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// classes (e.g. MidiDeviceService is a client, but MidiDeviceServer is
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// the owner), and errors occuring during sending need to be reported
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// to the owner rather than to the sender.
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//
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// Note that the callbacks will be called on the sender's thread.
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public interface MidiReceiverFailureHandler {
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void onReceiverFailure(MidiReceiver receiver, IOException failure);
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}
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private final MidiReceiverFailureHandler mFailureHandler;
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private final CopyOnWriteArrayList<MidiReceiver> mReceivers
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= new CopyOnWriteArrayList<MidiReceiver>();
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private final MidiSender mSender = new MidiSender() {
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@Override
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public void onConnect(MidiReceiver receiver) {
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mReceivers.add(receiver);
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}
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@Override
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public void onDisconnect(MidiReceiver receiver) {
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mReceivers.remove(receiver);
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}
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};
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public MidiDispatcher() {
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this(null);
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}
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public MidiDispatcher(MidiReceiverFailureHandler failureHandler) {
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mFailureHandler = failureHandler;
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}
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/**
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* Returns the number of {@link android.media.midi.MidiReceiver}s this dispatcher contains.
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* @return the number of receivers
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*/
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public int getReceiverCount() {
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return mReceivers.size();
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}
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/**
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* Returns a {@link android.media.midi.MidiSender} which is used to add and remove
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* {@link android.media.midi.MidiReceiver}s
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* to the dispatcher's receiver list.
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* @return the dispatcher's MidiSender
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*/
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public MidiSender getSender() {
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return mSender;
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}
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@Override
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public void onSend(byte[] msg, int offset, int count, long timestamp) throws IOException {
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for (MidiReceiver receiver : mReceivers) {
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try {
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receiver.send(msg, offset, count, timestamp);
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} catch (IOException e) {
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// If the receiver fails we remove the receiver but do not propagate the exception.
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// Note that this may also happen if the client code stalls, and thus underlying
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// MidiInputPort.onSend has raised IOException for EAGAIN / EWOULDBLOCK error.
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mReceivers.remove(receiver);
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if (mFailureHandler != null) {
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mFailureHandler.onReceiverFailure(receiver, e);
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}
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}
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}
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}
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@Override
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public void onFlush() throws IOException {
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for (MidiReceiver receiver : mReceivers) {
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try {
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receiver.flush();
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} catch (IOException e) {
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// This is just a special case of 'send' thus handle in the same way.
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mReceivers.remove(receiver);
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if (mFailureHandler != null) {
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mFailureHandler.onReceiverFailure(receiver, e);
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}
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}
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}
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}
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}
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