| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "MessageQueue-JNI" |
| |
| #include "JNIHelp.h" |
| |
| #include <utils/PollLoop.h> |
| #include <utils/Log.h> |
| #include "android_os_MessageQueue.h" |
| |
| namespace android { |
| |
| // ---------------------------------------------------------------------------- |
| |
| static struct { |
| jclass clazz; |
| |
| jfieldID mPtr; // native object attached to the DVM MessageQueue |
| } gMessageQueueClassInfo; |
| |
| // ---------------------------------------------------------------------------- |
| |
| class NativeMessageQueue { |
| public: |
| NativeMessageQueue(); |
| ~NativeMessageQueue(); |
| |
| inline sp<PollLoop> getPollLoop() { return mPollLoop; } |
| |
| bool pollOnce(int timeoutMillis); |
| void wake(); |
| |
| private: |
| sp<PollLoop> mPollLoop; |
| }; |
| |
| // ---------------------------------------------------------------------------- |
| |
| NativeMessageQueue::NativeMessageQueue() { |
| mPollLoop = new PollLoop(); |
| } |
| |
| NativeMessageQueue::~NativeMessageQueue() { |
| } |
| |
| bool NativeMessageQueue::pollOnce(int timeoutMillis) { |
| return mPollLoop->pollOnce(timeoutMillis); |
| } |
| |
| void NativeMessageQueue::wake() { |
| mPollLoop->wake(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| static NativeMessageQueue* android_os_MessageQueue_getNativeMessageQueue(JNIEnv* env, |
| jobject messageQueueObj) { |
| jint intPtr = env->GetIntField(messageQueueObj, gMessageQueueClassInfo.mPtr); |
| return reinterpret_cast<NativeMessageQueue*>(intPtr); |
| } |
| |
| static void android_os_MessageQueue_setNativeMessageQueue(JNIEnv* env, jobject messageQueueObj, |
| NativeMessageQueue* nativeMessageQueue) { |
| env->SetIntField(messageQueueObj, gMessageQueueClassInfo.mPtr, |
| reinterpret_cast<jint>(nativeMessageQueue)); |
| } |
| |
| sp<PollLoop> android_os_MessageQueue_getPollLoop(JNIEnv* env, jobject messageQueueObj) { |
| NativeMessageQueue* nativeMessageQueue = |
| android_os_MessageQueue_getNativeMessageQueue(env, messageQueueObj); |
| return nativeMessageQueue != NULL ? nativeMessageQueue->getPollLoop() : NULL; |
| } |
| |
| static void android_os_MessageQueue_nativeInit(JNIEnv* env, jobject obj) { |
| NativeMessageQueue* nativeMessageQueue = new NativeMessageQueue(); |
| if (! nativeMessageQueue) { |
| jniThrowRuntimeException(env, "Unable to allocate native queue"); |
| return; |
| } |
| |
| android_os_MessageQueue_setNativeMessageQueue(env, obj, nativeMessageQueue); |
| } |
| |
| static void android_os_MessageQueue_nativeDestroy(JNIEnv* env, jobject obj) { |
| NativeMessageQueue* nativeMessageQueue = |
| android_os_MessageQueue_getNativeMessageQueue(env, obj); |
| if (nativeMessageQueue) { |
| android_os_MessageQueue_setNativeMessageQueue(env, obj, NULL); |
| delete nativeMessageQueue; |
| } |
| } |
| |
| static void throwQueueNotInitialized(JNIEnv* env) { |
| jniThrowException(env, "java/lang/IllegalStateException", "Message queue not initialized"); |
| } |
| |
| static jboolean android_os_MessageQueue_nativePollOnce(JNIEnv* env, jobject obj, |
| jint timeoutMillis) { |
| NativeMessageQueue* nativeMessageQueue = |
| android_os_MessageQueue_getNativeMessageQueue(env, obj); |
| if (! nativeMessageQueue) { |
| throwQueueNotInitialized(env); |
| return false; |
| } |
| return nativeMessageQueue->pollOnce(timeoutMillis); |
| } |
| |
| static void android_os_MessageQueue_nativeWake(JNIEnv* env, jobject obj) { |
| NativeMessageQueue* nativeMessageQueue = |
| android_os_MessageQueue_getNativeMessageQueue(env, obj); |
| if (! nativeMessageQueue) { |
| throwQueueNotInitialized(env); |
| return; |
| } |
| return nativeMessageQueue->wake(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| static JNINativeMethod gMessageQueueMethods[] = { |
| /* name, signature, funcPtr */ |
| { "nativeInit", "()V", (void*)android_os_MessageQueue_nativeInit }, |
| { "nativeDestroy", "()V", (void*)android_os_MessageQueue_nativeDestroy }, |
| { "nativePollOnce", "(I)Z", (void*)android_os_MessageQueue_nativePollOnce }, |
| { "nativeWake", "()V", (void*)android_os_MessageQueue_nativeWake } |
| }; |
| |
| #define FIND_CLASS(var, className) \ |
| var = env->FindClass(className); \ |
| LOG_FATAL_IF(! var, "Unable to find class " className); \ |
| var = jclass(env->NewGlobalRef(var)); |
| |
| #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \ |
| var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \ |
| LOG_FATAL_IF(! var, "Unable to find field " fieldName); |
| |
| int register_android_os_MessageQueue(JNIEnv* env) { |
| int res = jniRegisterNativeMethods(env, "android/os/MessageQueue", |
| gMessageQueueMethods, NELEM(gMessageQueueMethods)); |
| LOG_FATAL_IF(res < 0, "Unable to register native methods."); |
| |
| FIND_CLASS(gMessageQueueClassInfo.clazz, "android/os/MessageQueue"); |
| |
| GET_FIELD_ID(gMessageQueueClassInfo.mPtr, gMessageQueueClassInfo.clazz, |
| "mPtr", "I"); |
| |
| return 0; |
| } |
| |
| } // namespace android |