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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 #ifndef BASE_ANDROID_JAVA_HANDLER_THREAD_H_
      6 #define BASE_ANDROID_JAVA_HANDLER_THREAD_H_
      7 
      8 #include <jni.h>
      9 
     10 #include <memory>
     11 
     12 #include "base/android/scoped_java_ref.h"
     13 
     14 namespace base {
     15 
     16 class MessageLoop;
     17 class WaitableEvent;
     18 
     19 namespace android {
     20 
     21 // A Java Thread with a native message loop. To run tasks, post them
     22 // to the message loop and they will be scheduled along with Java tasks
     23 // on the thread.
     24 // This is useful for callbacks where the receiver expects a thread
     25 // with a prepared Looper.
     26 class BASE_EXPORT JavaHandlerThread {
     27  public:
     28   JavaHandlerThread(const char* name);
     29   virtual ~JavaHandlerThread();
     30 
     31   base::MessageLoop* message_loop() const { return message_loop_.get(); }
     32   void Start();
     33   void Stop();
     34 
     35   // Called from java on the newly created thread.
     36   // Start() will not return before this methods has finished.
     37   void InitializeThread(JNIEnv* env,
     38                         const JavaParamRef<jobject>& obj,
     39                         jlong event);
     40   void StopThread(JNIEnv* env,
     41                   const JavaParamRef<jobject>& obj,
     42                   jlong event);
     43 
     44   static bool RegisterBindings(JNIEnv* env);
     45 
     46  private:
     47   std::unique_ptr<base::MessageLoop> message_loop_;
     48   ScopedJavaGlobalRef<jobject> java_thread_;
     49 };
     50 
     51 }  // namespace android
     52 }  // namespace base
     53 
     54 #endif  // BASE_ANDROID_JAVA_HANDLER_THREAD_H_
     55