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
16namespace base {
17
18namespace android {
19
20JavaHandlerThread::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
27JavaHandlerThread::~JavaHandlerThread() {
28}
29
30void 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
47void 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
59void 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
68void JavaHandlerThread::StopThread(JNIEnv* env,
69                                   const JavaParamRef<jobject>& obj,
70                                   jlong event) {
71  StopMessageLoop();
72  reinterpret_cast<base::WaitableEvent*>(event)->Signal();
73}
74
75void JavaHandlerThread::StartMessageLoop() {
76  static_cast<MessageLoopForUI*>(message_loop_.get())->Start();
77}
78
79void JavaHandlerThread::StopMessageLoop() {
80  static_cast<MessageLoopForUI*>(message_loop_.get())->QuitWhenIdle();
81}
82
83// static
84bool JavaHandlerThread::RegisterBindings(JNIEnv* env) {
85  return RegisterNativesImpl(env);
86}
87
88} // namespace android
89} // namespace base
90