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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_BINDINGS_TESTING_GARBAGE_COLLECTION_TEST_INTERFACE_H_
#define COBALT_BINDINGS_TESTING_GARBAGE_COLLECTION_TEST_INTERFACE_H_
#include <vector>
#include "cobalt/script/wrappable.h"
namespace cobalt {
namespace bindings {
namespace testing {
// GarbageCollectionTestInterface maintains strong references from head -> tail,
// and raw pointers from tail -> head to prevent reference cycles, similar to
// how references between Nodes are handled in Cobalt.
class GarbageCollectionTestInterface : public script::Wrappable {
public:
typedef std::vector<GarbageCollectionTestInterface*>
GarbageCollectionTestInterfaceVector;
GarbageCollectionTestInterface();
~GarbageCollectionTestInterface();
// The current |previous| node will become the tail of its list.
void set_previous(
const scoped_refptr<GarbageCollectionTestInterface>& previous);
scoped_refptr<GarbageCollectionTestInterface> previous() {
return make_scoped_refptr(previous_);
}
// The current |next| node will become the head of a new list.
void set_next(const scoped_refptr<GarbageCollectionTestInterface>& next);
scoped_refptr<GarbageCollectionTestInterface> next() { return next_; }
static GarbageCollectionTestInterfaceVector& instances();
void TraceMembers(script::Tracer* tracer) OVERRIDE;
DEFINE_WRAPPABLE_TYPE(GarbageCollectionTestInterface);
private:
void MakeHead();
void MakeTail();
static void Join(GarbageCollectionTestInterface* first,
GarbageCollectionTestInterface* second);
// Raw pointers going upstream, strong pointers going downstream to prevent
// reference cycles.
GarbageCollectionTestInterface* previous_;
scoped_refptr<GarbageCollectionTestInterface> next_;
};
} // namespace testing
} // namespace bindings
} // namespace cobalt
#endif // COBALT_BINDINGS_TESTING_GARBAGE_COLLECTION_TEST_INTERFACE_H_