core/jni/android_view_InputQueue.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2013 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 "InputQueue"

 #include <fcntl.h>
 #include <string.h>
 #include <unistd.h>

 #include <android/input.h>
 #include <android_runtime/AndroidRuntime.h>
 #include <android_runtime/android_view_InputQueue.h>
 #include <input/Input.h>
 #include <utils/Looper.h>
 #include <utils/TypeHelpers.h>
 #include <ScopedLocalRef.h>

 #include "JNIHelp.h"
 #include "android_os_MessageQueue.h"
 #include "android_view_KeyEvent.h"
 #include "android_view_MotionEvent.h"

 #include "core_jni_helpers.h"

 namespace android {

 static struct {
     jmethodID finishInputEvent;
 } gInputQueueClassInfo;

 enum {
     MSG_FINISH_INPUT = 1,
 };

 InputQueue::InputQueue(jobject inputQueueObj, const sp<Looper>& looper,
         int dispatchReadFd, int dispatchWriteFd) :
         mDispatchReadFd(dispatchReadFd), mDispatchWriteFd(dispatchWriteFd),
         mDispatchLooper(looper), mHandler(new WeakMessageHandler(this)) {
     JNIEnv* env = AndroidRuntime::getJNIEnv();
     mInputQueueWeakGlobal = env->NewGlobalRef(inputQueueObj);
 }

 InputQueue::~InputQueue() {
     mDispatchLooper->removeMessages(mHandler);
     JNIEnv* env = AndroidRuntime::getJNIEnv();
     env->DeleteGlobalRef(mInputQueueWeakGlobal);
     close(mDispatchReadFd);
     close(mDispatchWriteFd);
 }

 void InputQueue::attachLooper(Looper* looper, int ident,
         ALooper_callbackFunc callback, void* data) {
     Mutex::Autolock _l(mLock);
     for (size_t i = 0; i < mAppLoopers.size(); i++) {
         if (looper == mAppLoopers[i]) {
             return;
         }
     }
     mAppLoopers.push(looper);
     looper->addFd(mDispatchReadFd, ident, ALOOPER_EVENT_INPUT, callback, data);
 }

 void InputQueue::detachLooper() {
     Mutex::Autolock _l(mLock);
     detachLooperLocked();
 }

 void InputQueue::detachLooperLocked() {
     for (size_t i = 0; i < mAppLoopers.size(); i++) {
         mAppLoopers[i]->removeFd(mDispatchReadFd);
     }
     mAppLoopers.clear();
 }

 bool InputQueue::hasEvents() {
     Mutex::Autolock _l(mLock);
     return mPendingEvents.size() > 0;
 }

 status_t InputQueue::getEvent(InputEvent** outEvent) {
     Mutex::Autolock _l(mLock);
     *outEvent = NULL;
     if (!mPendingEvents.isEmpty()) {
         *outEvent = mPendingEvents[0];
         mPendingEvents.removeAt(0);
     }

     if (mPendingEvents.isEmpty()) {
         char byteread[16];
         ssize_t nRead;
         do {
             nRead = TEMP_FAILURE_RETRY(read(mDispatchReadFd, &byteread, sizeof(byteread)));
             if (nRead < 0 && errno != EAGAIN) {
                 ALOGW("Failed to read from native dispatch pipe: %s", strerror(errno));
             }
         } while (nRead > 0);
     }

     return *outEvent != NULL ? OK : WOULD_BLOCK;
 }

 bool InputQueue::preDispatchEvent(InputEvent* e) {
     if (e->getType() == AINPUT_EVENT_TYPE_KEY) {
         KeyEvent* keyEvent = static_cast<KeyEvent*>(e);
         if (keyEvent->getFlags() & AKEY_EVENT_FLAG_PREDISPATCH) {
             finishEvent(e, false);
             return true;
         }
     }
     return false;
 }

 void InputQueue::finishEvent(InputEvent* event, bool handled) {
     Mutex::Autolock _l(mLock);
     mFinishedEvents.push(key_value_pair_t<InputEvent*, bool>(event, handled));
     if (mFinishedEvents.size() == 1) {
         mDispatchLooper->sendMessage(this, Message(MSG_FINISH_INPUT));
     }
 }

 void InputQueue::handleMessage(const Message& message) {
     switch(message.what) {
     case MSG_FINISH_INPUT:
         JNIEnv* env = AndroidRuntime::getJNIEnv();
         ScopedLocalRef<jobject> inputQueueObj(env, jniGetReferent(env, mInputQueueWeakGlobal));
         if (!inputQueueObj.get()) {
             ALOGW("InputQueue was finalized without being disposed");
             return;
         }
         while (true) {
             InputEvent* event;
             bool handled;
             {
                 Mutex::Autolock _l(mLock);
                 if (mFinishedEvents.isEmpty()) {
                     break;
                 }
                 event = mFinishedEvents[0].getKey();
                 handled = mFinishedEvents[0].getValue();
                 mFinishedEvents.removeAt(0);
             }
             env->CallVoidMethod(inputQueueObj.get(), gInputQueueClassInfo.finishInputEvent,
                     reinterpret_cast<jlong>(event), handled);
             recycleInputEvent(event);
         }
         break;
     }
 }

 void InputQueue::recycleInputEvent(InputEvent* event) {
     mPooledInputEventFactory.recycle(event);
 }

 KeyEvent* InputQueue::createKeyEvent() {
     return mPooledInputEventFactory.createKeyEvent();
 }

 MotionEvent* InputQueue::createMotionEvent() {
     return mPooledInputEventFactory.createMotionEvent();
 }

 void InputQueue::enqueueEvent(InputEvent* event) {
     Mutex::Autolock _l(mLock);
     mPendingEvents.push(event);
     if (mPendingEvents.size() == 1) {
         char dummy = 0;
         int res = TEMP_FAILURE_RETRY(write(mDispatchWriteFd, &dummy, sizeof(dummy)));
         if (res < 0 && errno != EAGAIN) {
             ALOGW("Failed writing to dispatch fd: %s", strerror(errno));
         }
     }
 }

 InputQueue* InputQueue::createQueue(jobject inputQueueObj, const sp<Looper>& looper) {
     int pipeFds[2];
     if (pipe(pipeFds)) {
         ALOGW("Could not create native input dispatching pipe: %s", strerror(errno));
         return NULL;
     }
     fcntl(pipeFds[0], F_SETFL, O_NONBLOCK);
     fcntl(pipeFds[1], F_SETFL, O_NONBLOCK);
     return new InputQueue(inputQueueObj, looper, pipeFds[0], pipeFds[1]);
 }

 static jlong nativeInit(JNIEnv* env, jobject clazz, jobject queueWeak, jobject jMsgQueue) {
     sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, jMsgQueue);
     if (messageQueue == NULL) {
         jniThrowRuntimeException(env, "MessageQueue is not initialized.");
         return 0;
     }
     sp<InputQueue> queue = InputQueue::createQueue(queueWeak, messageQueue->getLooper());
     if (!queue.get()) {
         jniThrowRuntimeException(env, "InputQueue failed to initialize");
         return 0;
     }
     queue->incStrong(&gInputQueueClassInfo);
     return reinterpret_cast<jlong>(queue.get());
 }

 static void nativeDispose(JNIEnv* env, jobject clazz, jlong ptr) {
     sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
     queue->detachLooper();
     queue->decStrong(&gInputQueueClassInfo);
 }

 static jlong nativeSendKeyEvent(JNIEnv* env, jobject clazz, jlong ptr, jobject eventObj,
         jboolean predispatch) {
     InputQueue* queue = reinterpret_cast<InputQueue*>(ptr);
     KeyEvent* event = queue->createKeyEvent();
     status_t status = android_view_KeyEvent_toNative(env, eventObj, event);
     if (status) {
         queue->recycleInputEvent(event);
         jniThrowRuntimeException(env, "Could not read contents of KeyEvent object.");
         return -1;
     }

     if (predispatch) {
         event->setFlags(event->getFlags() | AKEY_EVENT_FLAG_PREDISPATCH);
     }

     queue->enqueueEvent(event);
     return reinterpret_cast<jlong>(event);
 }

 static jlong nativeSendMotionEvent(JNIEnv* env, jobject clazz, jlong ptr, jobject eventObj) {
     sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
     MotionEvent* originalEvent = android_view_MotionEvent_getNativePtr(env, eventObj);
     if (!originalEvent) {
         jniThrowRuntimeException(env, "Could not obtain MotionEvent pointer.");
         return -1;
     }
     MotionEvent* event = queue->createMotionEvent();
     event->copyFrom(originalEvent, true /* keepHistory */);
     queue->enqueueEvent(event);
     return reinterpret_cast<jlong>(event);
 }

 static const JNINativeMethod g_methods[] = {
     { "nativeInit", "(Ljava/lang/ref/WeakReference;Landroid/os/MessageQueue;)J",
         (void*) nativeInit },
     { "nativeDispose", "(J)V", (void*) nativeDispose },
     { "nativeSendKeyEvent", "(JLandroid/view/KeyEvent;Z)J", (void*) nativeSendKeyEvent },
     { "nativeSendMotionEvent", "(JLandroid/view/MotionEvent;)J", (void*) nativeSendMotionEvent },
 };

 static const char* const kInputQueuePathName = "android/view/InputQueue";

 int register_android_view_InputQueue(JNIEnv* env)
 {
     jclass clazz = FindClassOrDie(env, kInputQueuePathName);
     gInputQueueClassInfo.finishInputEvent = GetMethodIDOrDie(env, clazz, "finishInputEvent",
                                                              "(JZ)V");

     return RegisterMethodsOrDie(env, kInputQueuePathName, g_methods, NELEM(g_methods));
 }

 } // namespace android
	/*
	* Copyright (C) 2013 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 "InputQueue"

	#include <fcntl.h>
	#include <string.h>
	#include <unistd.h>

	#include <android/input.h>
	#include <android_runtime/AndroidRuntime.h>
	#include <android_runtime/android_view_InputQueue.h>
	#include <input/Input.h>
	#include <utils/Looper.h>
	#include <utils/TypeHelpers.h>
	#include <ScopedLocalRef.h>

	#include "JNIHelp.h"
	#include "android_os_MessageQueue.h"
	#include "android_view_KeyEvent.h"
	#include "android_view_MotionEvent.h"

	#include "core_jni_helpers.h"

	namespace android {

	static struct {
	jmethodID finishInputEvent;
	} gInputQueueClassInfo;

	enum {
	MSG_FINISH_INPUT = 1,
	};

	InputQueue::InputQueue(jobject inputQueueObj, const sp<Looper>& looper,
	int dispatchReadFd, int dispatchWriteFd) :
	mDispatchReadFd(dispatchReadFd), mDispatchWriteFd(dispatchWriteFd),
	mDispatchLooper(looper), mHandler(new WeakMessageHandler(this)) {
	JNIEnv* env = AndroidRuntime::getJNIEnv();
	mInputQueueWeakGlobal = env->NewGlobalRef(inputQueueObj);
	}

	InputQueue::~InputQueue() {
	mDispatchLooper->removeMessages(mHandler);
	JNIEnv* env = AndroidRuntime::getJNIEnv();
	env->DeleteGlobalRef(mInputQueueWeakGlobal);
	close(mDispatchReadFd);
	close(mDispatchWriteFd);
	}

	void InputQueue::attachLooper(Looper* looper, int ident,
	ALooper_callbackFunc callback, void* data) {
	Mutex::Autolock _l(mLock);
	for (size_t i = 0; i < mAppLoopers.size(); i++) {
	if (looper == mAppLoopers[i]) {
	return;
	}
	}
	mAppLoopers.push(looper);
	looper->addFd(mDispatchReadFd, ident, ALOOPER_EVENT_INPUT, callback, data);
	}

	void InputQueue::detachLooper() {
	Mutex::Autolock _l(mLock);
	detachLooperLocked();
	}

	void InputQueue::detachLooperLocked() {
	for (size_t i = 0; i < mAppLoopers.size(); i++) {
	mAppLoopers[i]->removeFd(mDispatchReadFd);
	}
	mAppLoopers.clear();
	}

	bool InputQueue::hasEvents() {
	Mutex::Autolock _l(mLock);
	return mPendingEvents.size() > 0;
	}

	status_t InputQueue::getEvent(InputEvent** outEvent) {
	Mutex::Autolock _l(mLock);
	*outEvent = NULL;
	if (!mPendingEvents.isEmpty()) {
	*outEvent = mPendingEvents[0];
	mPendingEvents.removeAt(0);
	}

	if (mPendingEvents.isEmpty()) {
	char byteread[16];
	ssize_t nRead;
	do {
	nRead = TEMP_FAILURE_RETRY(read(mDispatchReadFd, &byteread, sizeof(byteread)));
	if (nRead < 0 && errno != EAGAIN) {
	ALOGW("Failed to read from native dispatch pipe: %s", strerror(errno));
	}
	} while (nRead > 0);
	}

	return *outEvent != NULL ? OK : WOULD_BLOCK;
	}

	bool InputQueue::preDispatchEvent(InputEvent* e) {
	if (e->getType() == AINPUT_EVENT_TYPE_KEY) {
	KeyEvent* keyEvent = static_cast<KeyEvent*>(e);
	if (keyEvent->getFlags() & AKEY_EVENT_FLAG_PREDISPATCH) {
	finishEvent(e, false);
	return true;
	}
	}
	return false;
	}

	void InputQueue::finishEvent(InputEvent* event, bool handled) {
	Mutex::Autolock _l(mLock);
	mFinishedEvents.push(key_value_pair_t<InputEvent*, bool>(event, handled));
	if (mFinishedEvents.size() == 1) {
	mDispatchLooper->sendMessage(this, Message(MSG_FINISH_INPUT));
	}
	}

	void InputQueue::handleMessage(const Message& message) {
	switch(message.what) {
	case MSG_FINISH_INPUT:
	JNIEnv* env = AndroidRuntime::getJNIEnv();
	ScopedLocalRef<jobject> inputQueueObj(env, jniGetReferent(env, mInputQueueWeakGlobal));
	if (!inputQueueObj.get()) {
	ALOGW("InputQueue was finalized without being disposed");
	return;
	}
	while (true) {
	InputEvent* event;
	bool handled;
	{
	Mutex::Autolock _l(mLock);
	if (mFinishedEvents.isEmpty()) {
	break;
	}
	event = mFinishedEvents[0].getKey();
	handled = mFinishedEvents[0].getValue();
	mFinishedEvents.removeAt(0);
	}
	env->CallVoidMethod(inputQueueObj.get(), gInputQueueClassInfo.finishInputEvent,
	reinterpret_cast<jlong>(event), handled);
	recycleInputEvent(event);
	}
	break;
	}
	}

	void InputQueue::recycleInputEvent(InputEvent* event) {
	mPooledInputEventFactory.recycle(event);
	}

	KeyEvent* InputQueue::createKeyEvent() {
	return mPooledInputEventFactory.createKeyEvent();
	}

	MotionEvent* InputQueue::createMotionEvent() {
	return mPooledInputEventFactory.createMotionEvent();
	}

	void InputQueue::enqueueEvent(InputEvent* event) {
	Mutex::Autolock _l(mLock);
	mPendingEvents.push(event);
	if (mPendingEvents.size() == 1) {
	char dummy = 0;
	int res = TEMP_FAILURE_RETRY(write(mDispatchWriteFd, &dummy, sizeof(dummy)));
	if (res < 0 && errno != EAGAIN) {
	ALOGW("Failed writing to dispatch fd: %s", strerror(errno));
	}
	}
	}

	InputQueue* InputQueue::createQueue(jobject inputQueueObj, const sp<Looper>& looper) {
	int pipeFds[2];
	if (pipe(pipeFds)) {
	ALOGW("Could not create native input dispatching pipe: %s", strerror(errno));
	return NULL;
	}
	fcntl(pipeFds[0], F_SETFL, O_NONBLOCK);
	fcntl(pipeFds[1], F_SETFL, O_NONBLOCK);
	return new InputQueue(inputQueueObj, looper, pipeFds[0], pipeFds[1]);
	}

	static jlong nativeInit(JNIEnv* env, jobject clazz, jobject queueWeak, jobject jMsgQueue) {
	sp<MessageQueue> messageQueue = android_os_MessageQueue_getMessageQueue(env, jMsgQueue);
	if (messageQueue == NULL) {
	jniThrowRuntimeException(env, "MessageQueue is not initialized.");
	return 0;
	}
	sp<InputQueue> queue = InputQueue::createQueue(queueWeak, messageQueue->getLooper());
	if (!queue.get()) {
	jniThrowRuntimeException(env, "InputQueue failed to initialize");
	return 0;
	}
	queue->incStrong(&gInputQueueClassInfo);
	return reinterpret_cast<jlong>(queue.get());
	}

	static void nativeDispose(JNIEnv* env, jobject clazz, jlong ptr) {
	sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
	queue->detachLooper();
	queue->decStrong(&gInputQueueClassInfo);
	}

	static jlong nativeSendKeyEvent(JNIEnv* env, jobject clazz, jlong ptr, jobject eventObj,
	jboolean predispatch) {
	InputQueue* queue = reinterpret_cast<InputQueue*>(ptr);
	KeyEvent* event = queue->createKeyEvent();
	status_t status = android_view_KeyEvent_toNative(env, eventObj, event);
	if (status) {
	queue->recycleInputEvent(event);
	jniThrowRuntimeException(env, "Could not read contents of KeyEvent object.");
	return -1;
	}

	if (predispatch) {
	event->setFlags(event->getFlags() \| AKEY_EVENT_FLAG_PREDISPATCH);
	}

	queue->enqueueEvent(event);
	return reinterpret_cast<jlong>(event);
	}

	static jlong nativeSendMotionEvent(JNIEnv* env, jobject clazz, jlong ptr, jobject eventObj) {
	sp<InputQueue> queue = reinterpret_cast<InputQueue*>(ptr);
	MotionEvent* originalEvent = android_view_MotionEvent_getNativePtr(env, eventObj);
	if (!originalEvent) {
	jniThrowRuntimeException(env, "Could not obtain MotionEvent pointer.");
	return -1;
	}
	MotionEvent* event = queue->createMotionEvent();
	event->copyFrom(originalEvent, true /* keepHistory */);
	queue->enqueueEvent(event);
	return reinterpret_cast<jlong>(event);
	}

	static const JNINativeMethod g_methods[] = {
	{ "nativeInit", "(Ljava/lang/ref/WeakReference;Landroid/os/MessageQueue;)J",
	(void*) nativeInit },
	{ "nativeDispose", "(J)V", (void*) nativeDispose },
	{ "nativeSendKeyEvent", "(JLandroid/view/KeyEvent;Z)J", (void*) nativeSendKeyEvent },
	{ "nativeSendMotionEvent", "(JLandroid/view/MotionEvent;)J", (void*) nativeSendMotionEvent },
	};

	static const char* const kInputQueuePathName = "android/view/InputQueue";

	int register_android_view_InputQueue(JNIEnv* env)
	{
	jclass clazz = FindClassOrDie(env, kInputQueuePathName);
	gInputQueueClassInfo.finishInputEvent = GetMethodIDOrDie(env, clazz, "finishInputEvent",
	"(JZ)V");

	return RegisterMethodsOrDie(env, kInputQueuePathName, g_methods, NELEM(g_methods));
	}

	} // namespace android