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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_ANDROID_JAVA_HANDLER_THREAD_H_
#define BASE_ANDROID_JAVA_HANDLER_THREAD_H_
#include <jni.h>
#include <memory>
#include "base/android/scoped_java_ref.h"
#include "base/dcheck_is_on.h"
#include "base/memory/raw_ptr.h"
#include "base/task/sequence_manager/sequence_manager.h"
#include "base/task/sequence_manager/task_queue.h"
#include "base/task/single_thread_task_runner.h"
namespace base {
class MessagePumpForUI;
namespace android {
// A Java Thread with a native message loop. To run tasks, post them
// to the message loop and they will be scheduled along with Java tasks
// on the thread.
// This is useful for callbacks where the receiver expects a thread
// with a prepared Looper.
class BASE_EXPORT JavaHandlerThread {
public:
// Create new thread.
explicit JavaHandlerThread(
const char* name,
base::ThreadType thread_type = base::ThreadType::kDefault);
// Wrap and connect to an existing JavaHandlerThread.
// |obj| is an instance of JavaHandlerThread.
explicit JavaHandlerThread(
const char* name,
const base::android::ScopedJavaLocalRef<jobject>& obj);
virtual ~JavaHandlerThread();
// Gets the TaskRunner associated with the message loop.
// Called from any thread.
scoped_refptr<SingleThreadTaskRunner> task_runner() const {
return state_ ? state_->default_task_queue->task_runner() : nullptr;
}
// Called from the parent thread.
void Start();
void Stop();
// Called from java on the newly created thread.
// Start() will not return before this methods has finished.
void InitializeThread(JNIEnv* env,
jlong event);
// Called from java on this thread.
void OnLooperStopped(JNIEnv* env);
// Called from this thread.
void StopSequenceManagerForTesting();
// Called from this thread.
void JoinForTesting();
// Called from this thread.
// See comment in JavaHandlerThread.java regarding use of this function.
void ListenForUncaughtExceptionsForTesting();
// Called from this thread.
ScopedJavaLocalRef<jthrowable> GetUncaughtExceptionIfAny();
// Returns the thread ID. Should not be called before the first Start*()
// call. This method is thread-safe.
PlatformThreadId GetThreadId() const;
protected:
// Struct exists so JavaHandlerThread destructor can intentionally leak in an
// abort scenario.
struct State {
State();
~State();
std::unique_ptr<sequence_manager::SequenceManager> sequence_manager;
sequence_manager::TaskQueue::Handle default_task_queue;
raw_ptr<MessagePumpForUI> pump = nullptr;
};
State* state() const { return state_.get(); }
// Semantically the same as base::Thread#Init(), but unlike base::Thread the
// Android Looper will already be running. This Init() call will still run
// before other tasks are posted to the thread.
virtual void Init() {}
// Semantically the same as base::Thread#CleanUp(), called after the message
// loop ends. The Android Looper will also have been quit by this point.
virtual void CleanUp() {}
std::unique_ptr<State> state_;
private:
void StartMessageLoop();
void StopOnThread();
void QuitThreadSafely();
const char* name_;
base::PlatformThreadId thread_id_{};
ScopedJavaGlobalRef<jobject> java_thread_;
#if DCHECK_IS_ON()
bool initialized_ = false;
#endif
};
} // namespace android
} // namespace base
#endif // BASE_ANDROID_JAVA_HANDLER_THREAD_H_
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