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/*
* 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();
}
// ----------------------------------------------------------------------------
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<MessageQueue> android_os_MessageQueue_getMessageQueue(JNIEnv* env, jobject messageQueueObj) {
NativeMessageQueue* nativeMessageQueue =
android_os_MessageQueue_getNativeMessageQueue(env, messageQueueObj);
return nativeMessageQueue;
}
static void android_os_MessageQueue_nativeInit(JNIEnv* env, jobject obj) {
NativeMessageQueue* nativeMessageQueue = new NativeMessageQueue();
if (!nativeMessageQueue) {
jniThrowRuntimeException(env, "Unable to allocate native queue");
return;
}
nativeMessageQueue->incStrong(env);
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);
nativeMessageQueue->decStrong(env);
}
}
static void throwQueueNotInitialized(JNIEnv* env) {
jniThrowException(env, "java/lang/IllegalStateException", "Message queue not initialized");
}
static void android_os_MessageQueue_nativePollOnce(JNIEnv* env, jobject obj,
jint ptr, jint timeoutMillis) {
NativeMessageQueue* nativeMessageQueue = reinterpret_cast<NativeMessageQueue*>(ptr);
nativeMessageQueue->pollOnce(env, timeoutMillis);
}
static void android_os_MessageQueue_nativeWake(JNIEnv* env, jobject obj, jint ptr) {
NativeMessageQueue* nativeMessageQueue = reinterpret_cast<NativeMessageQueue*>(ptr);
return nativeMessageQueue->wake();
}
// ----------------------------------------------------------------------------
static JNINativeMethod gMessageQueueMethods[] = {
/* name, signature, funcPtr */
{ "nativeInit", "()V", (void*)android_os_MessageQueue_nativeInit },
{ "nativeDestroy", "()V", (void*)android_os_MessageQueue_nativeDestroy },
{ "nativePollOnce", "(II)V", (void*)android_os_MessageQueue_nativePollOnce },
{ "nativeWake", "(I)V", (void*)android_os_MessageQueue_nativeWake }
};
#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
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