1 /* 2 * Copyright (C) 2010 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 //#define LOG_NDEBUG 0 18 #define LOG_TAG "ALooperRoster" 19 #include <utils/Log.h> 20 21 #include "ALooperRoster.h" 22 23 #include "ADebug.h" 24 #include "AHandler.h" 25 #include "AMessage.h" 26 27 namespace android { 28 29 ALooperRoster::ALooperRoster() 30 : mNextHandlerID(1), 31 mNextReplyID(1) { 32 } 33 34 ALooper::handler_id ALooperRoster::registerHandler( 35 const sp<ALooper> looper, const sp<AHandler> &handler) { 36 Mutex::Autolock autoLock(mLock); 37 38 if (handler->id() != 0) { 39 CHECK(!"A handler must only be registered once."); 40 return INVALID_OPERATION; 41 } 42 43 HandlerInfo info; 44 info.mLooper = looper; 45 info.mHandler = handler; 46 ALooper::handler_id handlerID = mNextHandlerID++; 47 mHandlers.add(handlerID, info); 48 49 handler->setID(handlerID); 50 51 return handlerID; 52 } 53 54 void ALooperRoster::unregisterHandler(ALooper::handler_id handlerID) { 55 Mutex::Autolock autoLock(mLock); 56 57 ssize_t index = mHandlers.indexOfKey(handlerID); 58 59 if (index < 0) { 60 return; 61 } 62 63 const HandlerInfo &info = mHandlers.valueAt(index); 64 65 sp<AHandler> handler = info.mHandler.promote(); 66 67 if (handler != NULL) { 68 handler->setID(0); 69 } 70 71 mHandlers.removeItemsAt(index); 72 } 73 74 status_t ALooperRoster::postMessage( 75 const sp<AMessage> &msg, int64_t delayUs) { 76 Mutex::Autolock autoLock(mLock); 77 return postMessage_l(msg, delayUs); 78 } 79 80 status_t ALooperRoster::postMessage_l( 81 const sp<AMessage> &msg, int64_t delayUs) { 82 ssize_t index = mHandlers.indexOfKey(msg->target()); 83 84 if (index < 0) { 85 ALOGW("failed to post message. Target handler not registered."); 86 return -ENOENT; 87 } 88 89 const HandlerInfo &info = mHandlers.valueAt(index); 90 91 sp<ALooper> looper = info.mLooper.promote(); 92 93 if (looper == NULL) { 94 ALOGW("failed to post message. " 95 "Target handler %d still registered, but object gone.", 96 msg->target()); 97 98 mHandlers.removeItemsAt(index); 99 return -ENOENT; 100 } 101 102 looper->post(msg, delayUs); 103 104 return OK; 105 } 106 107 void ALooperRoster::deliverMessage(const sp<AMessage> &msg) { 108 sp<AHandler> handler; 109 110 { 111 Mutex::Autolock autoLock(mLock); 112 113 ssize_t index = mHandlers.indexOfKey(msg->target()); 114 115 if (index < 0) { 116 ALOGW("failed to deliver message. Target handler not registered."); 117 return; 118 } 119 120 const HandlerInfo &info = mHandlers.valueAt(index); 121 handler = info.mHandler.promote(); 122 123 if (handler == NULL) { 124 ALOGW("failed to deliver message. " 125 "Target handler %d registered, but object gone.", 126 msg->target()); 127 128 mHandlers.removeItemsAt(index); 129 return; 130 } 131 } 132 133 handler->onMessageReceived(msg); 134 } 135 136 sp<ALooper> ALooperRoster::findLooper(ALooper::handler_id handlerID) { 137 Mutex::Autolock autoLock(mLock); 138 139 ssize_t index = mHandlers.indexOfKey(handlerID); 140 141 if (index < 0) { 142 return NULL; 143 } 144 145 sp<ALooper> looper = mHandlers.valueAt(index).mLooper.promote(); 146 147 if (looper == NULL) { 148 mHandlers.removeItemsAt(index); 149 return NULL; 150 } 151 152 return looper; 153 } 154 155 status_t ALooperRoster::postAndAwaitResponse( 156 const sp<AMessage> &msg, sp<AMessage> *response) { 157 Mutex::Autolock autoLock(mLock); 158 159 uint32_t replyID = mNextReplyID++; 160 161 msg->setInt32("replyID", replyID); 162 163 status_t err = postMessage_l(msg, 0 /* delayUs */); 164 165 if (err != OK) { 166 response->clear(); 167 return err; 168 } 169 170 ssize_t index; 171 while ((index = mReplies.indexOfKey(replyID)) < 0) { 172 mRepliesCondition.wait(mLock); 173 } 174 175 *response = mReplies.valueAt(index); 176 mReplies.removeItemsAt(index); 177 178 return OK; 179 } 180 181 void ALooperRoster::postReply(uint32_t replyID, const sp<AMessage> &reply) { 182 Mutex::Autolock autoLock(mLock); 183 184 CHECK(mReplies.indexOfKey(replyID) < 0); 185 mReplies.add(replyID, reply); 186 mRepliesCondition.broadcast(); 187 } 188 189 } // namespace android 190
