Jungshik Jang | e81e108 | 2014-06-05 15:37:59 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.hdmi; |
| 18 | |
Jungshik Jang | e81e108 | 2014-06-05 15:37:59 +0900 | [diff] [blame] | 19 | import android.util.FastImmutableArraySet; |
| 20 | import android.util.SparseArray; |
| 21 | |
| 22 | /** |
| 23 | * Cache for incoming message. It caches {@link HdmiCecMessage} with source address and opcode |
| 24 | * as a key. |
| 25 | * |
| 26 | * <p>Note that whenever a device is removed it should call {@link #flushMessagesFrom(int)} |
| 27 | * to clean up messages come from the device. |
| 28 | */ |
| 29 | final class HdmiCecMessageCache { |
Jinsuk Kim | c0c20d0 | 2014-07-04 14:34:31 +0900 | [diff] [blame] | 30 | private static final FastImmutableArraySet<Integer> CACHEABLE_OPCODES = |
| 31 | new FastImmutableArraySet<>(new Integer[] { |
| 32 | Constants.MESSAGE_SET_OSD_NAME, |
| 33 | Constants.MESSAGE_REPORT_PHYSICAL_ADDRESS, |
| 34 | Constants.MESSAGE_DEVICE_VENDOR_ID, |
| 35 | Constants.MESSAGE_CEC_VERSION, |
Jungshik Jang | e81e108 | 2014-06-05 15:37:59 +0900 | [diff] [blame] | 36 | }); |
| 37 | |
| 38 | // It's like [Source Logical Address, [Opcode, HdmiCecMessage]]. |
| 39 | private final SparseArray<SparseArray<HdmiCecMessage>> mCache = new SparseArray<>(); |
| 40 | |
| 41 | HdmiCecMessageCache() { |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Return a {@link HdmiCecMessage} corresponding to the given {@code address} and |
| 46 | * {@code opcode}. |
| 47 | * |
| 48 | * @param address a logical address of source device |
| 49 | * @param opcode opcode of message |
| 50 | * @return null if has no {@link HdmiCecMessage} matched to the given {@code address} and {code |
| 51 | * opcode} |
| 52 | */ |
| 53 | public HdmiCecMessage getMessage(int address, int opcode) { |
| 54 | SparseArray<HdmiCecMessage> messages = mCache.get(address); |
| 55 | if (messages == null) { |
| 56 | return null; |
| 57 | } |
| 58 | |
| 59 | return messages.get(opcode); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Flush all {@link HdmiCecMessage}s sent from the given {@code address}. |
| 64 | * |
| 65 | * @param address a logical address of source device |
| 66 | */ |
| 67 | public void flushMessagesFrom(int address) { |
| 68 | mCache.remove(address); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Flush all cached {@link HdmiCecMessage}s. |
| 73 | */ |
| 74 | public void flushAll() { |
| 75 | mCache.clear(); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Cache incoming {@link HdmiCecMessage}. If opcode of message is not listed on |
| 80 | * cacheable opcodes list, just ignore it. |
| 81 | * |
| 82 | * @param message a {@link HdmiCecMessage} to be cached |
| 83 | */ |
| 84 | public void cacheMessage(HdmiCecMessage message) { |
| 85 | int opcode = message.getOpcode(); |
| 86 | if (!isCacheable(opcode)) { |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | int source = message.getSource(); |
| 91 | SparseArray<HdmiCecMessage> messages = mCache.get(source); |
| 92 | if (messages == null) { |
| 93 | messages = new SparseArray<>(); |
| 94 | mCache.put(source, messages); |
| 95 | } |
| 96 | messages.put(opcode, message); |
| 97 | } |
| 98 | |
| 99 | private boolean isCacheable(int opcode) { |
| 100 | return CACHEABLE_OPCODES.contains(opcode); |
| 101 | } |
| 102 | } |