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