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52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_ANDROID_JNI_WEAK_REF_H_
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#define BASE_ANDROID_JNI_WEAK_REF_H_
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#include <jni.h>
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#include "base/android/scoped_java_ref.h"
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#include "base/base_export.h"
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// Manages WeakGlobalRef lifecycle.
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// This class is not thread-safe w.r.t. get() and reset(). Multiple threads may
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// safely use get() concurrently, but if the user calls reset() (or of course,
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// calls the destructor) they'll need to provide their own synchronization.
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class BASE_EXPORT JavaObjectWeakGlobalRef {
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public:
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JavaObjectWeakGlobalRef();
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JavaObjectWeakGlobalRef(const JavaObjectWeakGlobalRef& orig);
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JavaObjectWeakGlobalRef(JavaObjectWeakGlobalRef&& orig) noexcept;
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JavaObjectWeakGlobalRef(JNIEnv* env, jobject obj);
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JavaObjectWeakGlobalRef(JNIEnv* env,
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const base::android::JavaRef<jobject>& obj);
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virtual ~JavaObjectWeakGlobalRef();
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void operator=(const JavaObjectWeakGlobalRef& rhs);
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void operator=(JavaObjectWeakGlobalRef&& rhs);
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base::android::ScopedJavaLocalRef<jobject> get(JNIEnv* env) const;
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// Returns true if the weak reference has not been initialized to point at
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// an object (or ḣas had reset() called).
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// Do not call this to test if the object referred to still exists! The weak
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// reference remains initialized even if the target object has been collected.
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bool is_uninitialized() const { return obj_ == nullptr; }
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void reset();
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private:
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void Assign(const JavaObjectWeakGlobalRef& rhs);
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jweak obj_;
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};
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// Get the real object stored in the weak reference returned as a
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// ScopedJavaLocalRef.
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BASE_EXPORT base::android::ScopedJavaLocalRef<jobject> GetRealObject(
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JNIEnv* env, jweak obj);
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#endif // BASE_ANDROID_JNI_WEAK_REF_H_
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