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| 1 // Copyright 2014 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_JNI_WEAK_REF_H_ | |
| 6 #define BASE_ANDROID_JNI_WEAK_REF_H_ | |
| 7 | |
| 8 #include <jni.h> | |
| 9 | |
| 10 #include "base/android/scoped_java_ref.h" | |
| 11 #include "base/base_export.h" | |
| 12 | |
| 13 // Manages WeakGlobalRef lifecycle. | |
| 14 // This class is not thread-safe w.r.t. get() and reset(). Multiple threads may | |
| 15 // safely use get() concurrently, but if the user calls reset() (or of course, | |
| 16 // calls the destructor) they'll need to provide their own synchronization. | |
| 17 class BASE_EXPORT JavaObjectWeakGlobalRef { | |
| 18 public: | |
| 19 JavaObjectWeakGlobalRef(); | |
| 20 JavaObjectWeakGlobalRef(const JavaObjectWeakGlobalRef& orig); | |
| 21 JavaObjectWeakGlobalRef(JNIEnv* env, jobject obj); | |
| 22 virtual ~JavaObjectWeakGlobalRef(); | |
| 23 | |
| 24 void operator=(const JavaObjectWeakGlobalRef& rhs); | |
| 25 | |
| 26 base::android::ScopedJavaLocalRef<jobject> get(JNIEnv* env) const; | |
| 27 | |
| 28 bool is_empty() const { return obj_ == NULL; } | |
| 29 | |
| 30 void reset(); | |
| 31 | |
| 32 private: | |
| 33 void Assign(const JavaObjectWeakGlobalRef& rhs); | |
| 34 | |
| 35 jweak obj_; | |
| 36 }; | |
| 37 | |
| 38 // Get the real object stored in the weak reference returned as a | |
| 39 // ScopedJavaLocalRef. | |
| 40 BASE_EXPORT base::android::ScopedJavaLocalRef<jobject> GetRealObject( | |
| 41 JNIEnv* env, jweak obj); | |
| 42 | |
| 43 #endif // BASE_ANDROID_JNI_WEAK_REF_H_ | |
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