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 '%s'. Target handler not registered.", 86 msg->debugString().c_str()); 87 return -ENOENT; 88 } 89 90 const HandlerInfo &info = mHandlers.valueAt(index); 91 92 sp<ALooper> looper = info.mLooper.promote(); 93 94 if (looper == NULL) { 95 ALOGW("failed to post message. " 96 "Target handler %d still registered, but object gone.", 97 msg->target()); 98 99 mHandlers.removeItemsAt(index); 100 return -ENOENT; 101 } 102 103 looper->post(msg, delayUs); 104 105 return OK; 106 } 107 108 void ALooperRoster::deliverMessage(const sp<AMessage> &msg) { 109 sp<AHandler> handler; 110 111 { 112 Mutex::Autolock autoLock(mLock); 113 114 ssize_t index = mHandlers.indexOfKey(msg->target()); 115 116 if (index < 0) { 117 ALOGW("failed to deliver message. Target handler not registered."); 118 return; 119 } 120 121 const HandlerInfo &info = mHandlers.valueAt(index); 122 handler = info.mHandler.promote(); 123 124 if (handler == NULL) { 125 ALOGW("failed to deliver message. " 126 "Target handler %d registered, but object gone.", 127 msg->target()); 128 129 mHandlers.removeItemsAt(index); 130 return; 131 } 132 } 133 134 handler->onMessageReceived(msg); 135 } 136 137 sp<ALooper> ALooperRoster::findLooper(ALooper::handler_id handlerID) { 138 Mutex::Autolock autoLock(mLock); 139 140 ssize_t index = mHandlers.indexOfKey(handlerID); 141 142 if (index < 0) { 143 return NULL; 144 } 145 146 sp<ALooper> looper = mHandlers.valueAt(index).mLooper.promote(); 147 148 if (looper == NULL) { 149 mHandlers.removeItemsAt(index); 150 return NULL; 151 } 152 153 return looper; 154 } 155 156 status_t ALooperRoster::postAndAwaitResponse( 157 const sp<AMessage> &msg, sp<AMessage> *response) { 158 Mutex::Autolock autoLock(mLock); 159 160 uint32_t replyID = mNextReplyID++; 161 162 msg->setInt32("replyID", replyID); 163 164 status_t err = postMessage_l(msg, 0 /* delayUs */); 165 166 if (err != OK) { 167 response->clear(); 168 return err; 169 } 170 171 ssize_t index; 172 while ((index = mReplies.indexOfKey(replyID)) < 0) { 173 mRepliesCondition.wait(mLock); 174 } 175 176 *response = mReplies.valueAt(index); 177 mReplies.removeItemsAt(index); 178 179 return OK; 180 } 181 182 void ALooperRoster::postReply(uint32_t replyID, const sp<AMessage> &reply) { 183 Mutex::Autolock autoLock(mLock); 184 185 CHECK(mReplies.indexOfKey(replyID) < 0); 186 mReplies.add(replyID, reply); 187 mRepliesCondition.broadcast(); 188 } 189 190 } // namespace android 191
