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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/android/java_handler_thread.h"
      6 
      7 #include <jni.h>
      8 
      9 #include "base/android/jni_android.h"
     10 #include "base/android/jni_string.h"
     11 #include "base/message_loop/message_loop.h"
     12 #include "base/synchronization/waitable_event.h"
     13 #include "base/threading/thread_restrictions.h"
     14 #include "jni/JavaHandlerThread_jni.h"
     15 
     16 namespace base {
     17 
     18 namespace android {
     19 
     20 JavaHandlerThread::JavaHandlerThread(const char* name) {
     21   JNIEnv* env = base::android::AttachCurrentThread();
     22 
     23   java_thread_.Reset(
     24       Java_JavaHandlerThread_create(env, ConvertUTF8ToJavaString(env, name)));
     25 }
     26 
     27 JavaHandlerThread::~JavaHandlerThread() {
     28 }
     29 
     30 void JavaHandlerThread::Start() {
     31   // Check the thread has not already been started.
     32   DCHECK(!message_loop_);
     33 
     34   JNIEnv* env = base::android::AttachCurrentThread();
     35   base::WaitableEvent initialize_event(
     36       WaitableEvent::ResetPolicy::AUTOMATIC,
     37       WaitableEvent::InitialState::NOT_SIGNALED);
     38   Java_JavaHandlerThread_start(env, java_thread_,
     39                                reinterpret_cast<intptr_t>(this),
     40                                reinterpret_cast<intptr_t>(&initialize_event));
     41   // Wait for thread to be initialized so it is ready to be used when Start
     42   // returns.
     43   base::ThreadRestrictions::ScopedAllowWait wait_allowed;
     44   initialize_event.Wait();
     45 }
     46 
     47 void JavaHandlerThread::Stop() {
     48   JNIEnv* env = base::android::AttachCurrentThread();
     49   base::WaitableEvent shutdown_event(WaitableEvent::ResetPolicy::AUTOMATIC,
     50                                      WaitableEvent::InitialState::NOT_SIGNALED);
     51   Java_JavaHandlerThread_stop(env, java_thread_,
     52                               reinterpret_cast<intptr_t>(this),
     53                               reinterpret_cast<intptr_t>(&shutdown_event));
     54   // Wait for thread to shut down before returning.
     55   base::ThreadRestrictions::ScopedAllowWait wait_allowed;
     56   shutdown_event.Wait();
     57 }
     58 
     59 void JavaHandlerThread::InitializeThread(JNIEnv* env,
     60                                          const JavaParamRef<jobject>& obj,
     61                                          jlong event) {
     62   // TYPE_JAVA to get the Android java style message loop.
     63   message_loop_.reset(new base::MessageLoop(base::MessageLoop::TYPE_JAVA));
     64   StartMessageLoop();
     65   reinterpret_cast<base::WaitableEvent*>(event)->Signal();
     66 }
     67 
     68 void JavaHandlerThread::StopThread(JNIEnv* env,
     69                                    const JavaParamRef<jobject>& obj,
     70                                    jlong event) {
     71   StopMessageLoop();
     72   reinterpret_cast<base::WaitableEvent*>(event)->Signal();
     73 }
     74 
     75 void JavaHandlerThread::StartMessageLoop() {
     76   static_cast<MessageLoopForUI*>(message_loop_.get())->Start();
     77 }
     78 
     79 void JavaHandlerThread::StopMessageLoop() {
     80   static_cast<MessageLoopForUI*>(message_loop_.get())->QuitWhenIdle();
     81 }
     82 
     83 // static
     84 bool JavaHandlerThread::RegisterBindings(JNIEnv* env) {
     85   return RegisterNativesImpl(env);
     86 }
     87 
     88 } // namespace android
     89 } // namespace base
     90