| /* |
| * 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 <android_runtime/AndroidRuntime.h> |
| |
| #include <utils/Looper.h> |
| #include <utils/Log.h> |
| #include "android_os_MessageQueue.h" |
| |
| namespace android { |
| |
| static struct { |
| jfieldID mPtr; // native object attached to the DVM MessageQueue |
| } gMessageQueueClassInfo; |
| |
| |
| class NativeMessageQueue : public MessageQueue { |
| public: |
| NativeMessageQueue(); |
| virtual ~NativeMessageQueue(); |
| |
| virtual void raiseException(JNIEnv* env, const char* msg, jthrowable exceptionObj); |
| |
| void pollOnce(JNIEnv* env, int timeoutMillis); |
| |
| void wake(); |
| |
| private: |
| bool mInCallback; |
| jthrowable mExceptionObj; |
| }; |
| |
| |
| MessageQueue::MessageQueue() { |
| } |
| |
| MessageQueue::~MessageQueue() { |
| } |
| |
| bool MessageQueue::raiseAndClearException(JNIEnv* env, const char* msg) { |
| jthrowable exceptionObj = env->ExceptionOccurred(); |
| if (exceptionObj) { |
| env->ExceptionClear(); |
| raiseException(env, msg, exceptionObj); |
| env->DeleteLocalRef(exceptionObj); |
| return true; |
| } |
| return false; |
| } |
| |
| NativeMessageQueue::NativeMessageQueue() : mInCallback(false), mExceptionObj(NULL) { |
| mLooper = Looper::getForThread(); |
| if (mLooper == NULL) { |
| mLooper = new Looper(false); |
| Looper::setForThread(mLooper); |
| } |
| } |
| |
| NativeMessageQueue::~NativeMessageQueue() { |
| } |
| |
| void NativeMessageQueue::raiseException(JNIEnv* env, const char* msg, jthrowable exceptionObj) { |
| if (exceptionObj) { |
| if (mInCallback) { |
| if (mExceptionObj) { |
| env->DeleteLocalRef(mExceptionObj); |
| } |
| mExceptionObj = jthrowable(env->NewLocalRef(exceptionObj)); |
| ALOGE("Exception in MessageQueue callback: %s", msg); |
| jniLogException(env, ANDROID_LOG_ERROR, LOG_TAG, exceptionObj); |
| } else { |
| ALOGE("Exception: %s", msg); |
| jniLogException(env, ANDROID_LOG_ERROR, LOG_TAG, exceptionObj); |
| LOG_ALWAYS_FATAL("raiseException() was called when not in a callback, exiting."); |
| } |
| } |
| } |
| |
| void NativeMessageQueue::pollOnce(JNIEnv* env, int timeoutMillis) { |
| mInCallback = true; |
| mLooper->pollOnce(timeoutMillis); |
| mInCallback = false; |
| if (mExceptionObj) { |
| env->Throw(mExceptionObj); |
| env->DeleteLocalRef(mExceptionObj); |
| mExceptionObj = NULL; |
| } |
| } |
| |
| void NativeMessageQueue::wake() { |
| mLooper->wake(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| sp<MessageQueue> android_os_MessageQueue_getMessageQueue(JNIEnv* env, jobject messageQueueObj) { |
| jint intPtr = env->GetIntField(messageQueueObj, gMessageQueueClassInfo.mPtr); |
| return reinterpret_cast<NativeMessageQueue*>(intPtr); |
| } |
| |
| static jint android_os_MessageQueue_nativeInit(JNIEnv* env, jclass clazz) { |
| NativeMessageQueue* nativeMessageQueue = new NativeMessageQueue(); |
| if (!nativeMessageQueue) { |
| jniThrowRuntimeException(env, "Unable to allocate native queue"); |
| return 0; |
| } |
| |
| nativeMessageQueue->incStrong(env); |
| return reinterpret_cast<jint>(nativeMessageQueue); |
| } |
| |
| static void android_os_MessageQueue_nativeDestroy(JNIEnv* env, jclass clazz, jint ptr) { |
| NativeMessageQueue* nativeMessageQueue = reinterpret_cast<NativeMessageQueue*>(ptr); |
| nativeMessageQueue->decStrong(env); |
| } |
| |
| static void android_os_MessageQueue_nativePollOnce(JNIEnv* env, jclass clazz, |
| jint ptr, jint timeoutMillis) { |
| NativeMessageQueue* nativeMessageQueue = reinterpret_cast<NativeMessageQueue*>(ptr); |
| nativeMessageQueue->pollOnce(env, timeoutMillis); |
| } |
| |
| static void android_os_MessageQueue_nativeWake(JNIEnv* env, jclass clazz, jint ptr) { |
| NativeMessageQueue* nativeMessageQueue = reinterpret_cast<NativeMessageQueue*>(ptr); |
| return nativeMessageQueue->wake(); |
| } |
| |
| static jboolean android_os_MessageQueue_nativeIsIdling(JNIEnv* env, jclass clazz, jint ptr) { |
| NativeMessageQueue* nativeMessageQueue = reinterpret_cast<NativeMessageQueue*>(ptr); |
| return nativeMessageQueue->getLooper()->isIdling(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| static JNINativeMethod gMessageQueueMethods[] = { |
| /* name, signature, funcPtr */ |
| { "nativeInit", "()I", (void*)android_os_MessageQueue_nativeInit }, |
| { "nativeDestroy", "(I)V", (void*)android_os_MessageQueue_nativeDestroy }, |
| { "nativePollOnce", "(II)V", (void*)android_os_MessageQueue_nativePollOnce }, |
| { "nativeWake", "(I)V", (void*)android_os_MessageQueue_nativeWake }, |
| { "nativeIsIdling", "(I)Z", (void*)android_os_MessageQueue_nativeIsIdling } |
| }; |
| |
| #define FIND_CLASS(var, className) \ |
| var = env->FindClass(className); \ |
| LOG_FATAL_IF(! var, "Unable to find class " className); |
| |
| #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."); |
| |
| jclass clazz; |
| FIND_CLASS(clazz, "android/os/MessageQueue"); |
| |
| GET_FIELD_ID(gMessageQueueClassInfo.mPtr, clazz, |
| "mPtr", "I"); |
| |
| return 0; |
| } |
| |
| } // namespace android |