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