70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
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/*
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#include <cstdint>
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#include <jni/Countable.h>
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#include <fb/Environment.h>
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#include <jni/Registration.h>
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namespace facebook {
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namespace jni {
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static jfieldID gCountableNativePtr;
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static RefPtr<Countable>* rawCountableFromJava(JNIEnv* env, jobject obj) {
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FBASSERT(obj);
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return reinterpret_cast<RefPtr<Countable>*>(env->GetLongField(obj, gCountableNativePtr));
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}
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const RefPtr<Countable>& countableFromJava(JNIEnv* env, jobject obj) {
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FBASSERT(obj);
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return *rawCountableFromJava(env, obj);
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}
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void setCountableForJava(JNIEnv* env, jobject obj, RefPtr<Countable>&& countable) {
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int oldValue = env->GetLongField(obj, gCountableNativePtr);
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FBASSERTMSGF(oldValue == 0, "Cannot reinitialize object; expected nullptr, got %x", oldValue);
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FBASSERT(countable);
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uintptr_t fieldValue = (uintptr_t) new RefPtr<Countable>(std::move(countable));
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env->SetLongField(obj, gCountableNativePtr, fieldValue);
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}
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/**
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* NB: THREAD SAFETY (this comment also exists at Countable.java)
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*
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* This method deletes the corresponding native object on whatever thread the method is called
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* on. In the common case when this is called by Countable#finalize(), this will be called on the
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* system finalizer thread. If you manually call dispose on the Java object, the native object
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* will be deleted synchronously on that thread.
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*/
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void dispose(JNIEnv* env, jobject obj) {
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// Grab the pointer
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RefPtr<Countable>* countable = rawCountableFromJava(env, obj);
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if (!countable) {
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// That was easy.
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return;
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}
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// Clear out the old value to avoid double-frees
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env->SetLongField(obj, gCountableNativePtr, 0);
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delete countable;
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}
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void CountableOnLoad(JNIEnv* env) {
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jclass countable = env->FindClass("com/facebook/jni/Countable");
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gCountableNativePtr = env->GetFieldID(countable, "mInstance", "J");
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registerNatives(env, countable, {
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{ "dispose", "()V", (void*) dispose },
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});
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}
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} }
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