| /* |
| * Copyright (C) 2014 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.server.hdmi; |
| |
| import android.util.FastImmutableArraySet; |
| import android.util.SparseArray; |
| |
| /** |
| * Cache for incoming message. It caches {@link HdmiCecMessage} with source address and opcode |
| * as a key. |
| * |
| * <p>Note that whenever a device is removed it should call {@link #flushMessagesFrom(int)} |
| * to clean up messages come from the device. |
| */ |
| final class HdmiCecMessageCache { |
| private static final FastImmutableArraySet<Integer> CACHEABLE_OPCODES = |
| new FastImmutableArraySet<>(new Integer[] { |
| Constants.MESSAGE_SET_OSD_NAME, |
| Constants.MESSAGE_REPORT_PHYSICAL_ADDRESS, |
| Constants.MESSAGE_DEVICE_VENDOR_ID, |
| Constants.MESSAGE_CEC_VERSION, |
| }); |
| |
| // It's like [Source Logical Address, [Opcode, HdmiCecMessage]]. |
| private final SparseArray<SparseArray<HdmiCecMessage>> mCache = new SparseArray<>(); |
| |
| HdmiCecMessageCache() { |
| } |
| |
| /** |
| * Return a {@link HdmiCecMessage} corresponding to the given {@code address} and |
| * {@code opcode}. |
| * |
| * @param address a logical address of source device |
| * @param opcode opcode of message |
| * @return null if has no {@link HdmiCecMessage} matched to the given {@code address} and {code |
| * opcode} |
| */ |
| public HdmiCecMessage getMessage(int address, int opcode) { |
| SparseArray<HdmiCecMessage> messages = mCache.get(address); |
| if (messages == null) { |
| return null; |
| } |
| |
| return messages.get(opcode); |
| } |
| |
| /** |
| * Flush all {@link HdmiCecMessage}s sent from the given {@code address}. |
| * |
| * @param address a logical address of source device |
| */ |
| public void flushMessagesFrom(int address) { |
| mCache.remove(address); |
| } |
| |
| /** |
| * Flush all cached {@link HdmiCecMessage}s. |
| */ |
| public void flushAll() { |
| mCache.clear(); |
| } |
| |
| /** |
| * Cache incoming {@link HdmiCecMessage}. If opcode of message is not listed on |
| * cacheable opcodes list, just ignore it. |
| * |
| * @param message a {@link HdmiCecMessage} to be cached |
| */ |
| public void cacheMessage(HdmiCecMessage message) { |
| int opcode = message.getOpcode(); |
| if (!isCacheable(opcode)) { |
| return; |
| } |
| |
| int source = message.getSource(); |
| SparseArray<HdmiCecMessage> messages = mCache.get(source); |
| if (messages == null) { |
| messages = new SparseArray<>(); |
| mCache.put(source, messages); |
| } |
| messages.put(opcode, message); |
| } |
| |
| private boolean isCacheable(int opcode) { |
| return CACHEABLE_OPCODES.contains(opcode); |
| } |
| } |