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 void ALooperRoster::unregisterStaleHandlers() { 75 Mutex::Autolock autoLock(mLock); 76 77 for (size_t i = mHandlers.size(); i-- > 0;) { 78 const HandlerInfo &info = mHandlers.valueAt(i); 79 80 sp<ALooper> looper = info.mLooper.promote(); 81 if (looper == NULL) { 82 ALOGV("Unregistering stale handler %d", mHandlers.keyAt(i)); 83 mHandlers.removeItemsAt(i); 84 } 85 } 86 } 87 88 status_t ALooperRoster::postMessage( 89 const sp<AMessage> &msg, int64_t delayUs) { 90 Mutex::Autolock autoLock(mLock); 91 return postMessage_l(msg, delayUs); 92 } 93 94 status_t ALooperRoster::postMessage_l( 95 const sp<AMessage> &msg, int64_t delayUs) { 96 ssize_t index = mHandlers.indexOfKey(msg->target()); 97 98 if (index < 0) { 99 ALOGW("failed to post message '%s'. Target handler not registered.", 100 msg->debugString().c_str()); 101 return -ENOENT; 102 } 103 104 const HandlerInfo &info = mHandlers.valueAt(index); 105 106 sp<ALooper> looper = info.mLooper.promote(); 107 108 if (looper == NULL) { 109 ALOGW("failed to post message. " 110 "Target handler %d still registered, but object gone.", 111 msg->target()); 112 113 mHandlers.removeItemsAt(index); 114 return -ENOENT; 115 } 116 117 looper->post(msg, delayUs); 118 119 return OK; 120 } 121 122 void ALooperRoster::deliverMessage(const sp<AMessage> &msg) { 123 sp<AHandler> handler; 124 125 { 126 Mutex::Autolock autoLock(mLock); 127 128 ssize_t index = mHandlers.indexOfKey(msg->target()); 129 130 if (index < 0) { 131 ALOGW("failed to deliver message. Target handler not registered."); 132 return; 133 } 134 135 const HandlerInfo &info = mHandlers.valueAt(index); 136 handler = info.mHandler.promote(); 137 138 if (handler == NULL) { 139 ALOGW("failed to deliver message. " 140 "Target handler %d registered, but object gone.", 141 msg->target()); 142 143 mHandlers.removeItemsAt(index); 144 return; 145 } 146 } 147 148 handler->onMessageReceived(msg); 149 } 150 151 sp<ALooper> ALooperRoster::findLooper(ALooper::handler_id handlerID) { 152 Mutex::Autolock autoLock(mLock); 153 154 ssize_t index = mHandlers.indexOfKey(handlerID); 155 156 if (index < 0) { 157 return NULL; 158 } 159 160 sp<ALooper> looper = mHandlers.valueAt(index).mLooper.promote(); 161 162 if (looper == NULL) { 163 mHandlers.removeItemsAt(index); 164 return NULL; 165 } 166 167 return looper; 168 } 169 170 status_t ALooperRoster::postAndAwaitResponse( 171 const sp<AMessage> &msg, sp<AMessage> *response) { 172 Mutex::Autolock autoLock(mLock); 173 174 uint32_t replyID = mNextReplyID++; 175 176 msg->setInt32("replyID", replyID); 177 178 status_t err = postMessage_l(msg, 0 /* delayUs */); 179 180 if (err != OK) { 181 response->clear(); 182 return err; 183 } 184 185 ssize_t index; 186 while ((index = mReplies.indexOfKey(replyID)) < 0) { 187 mRepliesCondition.wait(mLock); 188 } 189 190 *response = mReplies.valueAt(index); 191 mReplies.removeItemsAt(index); 192 193 return OK; 194 } 195 196 void ALooperRoster::postReply(uint32_t replyID, const sp<AMessage> &reply) { 197 Mutex::Autolock autoLock(mLock); 198 199 CHECK(mReplies.indexOfKey(replyID) < 0); 200 mReplies.add(replyID, reply); 201 mRepliesCondition.broadcast(); 202 } 203 204 } // namespace android 205
