src/dawn/wire/client/ObjectStore.h

// Copyright 2019 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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#ifndef SRC_DAWN_WIRE_CLIENT_OBJECTSTORE_H_
#define SRC_DAWN_WIRE_CLIENT_OBJECTSTORE_H_

#include <memory>
#include <vector>

#include "dawn/wire/client/ObjectBase.h"

namespace dawn::wire::client {

class Client;

// A helper class used in Client, ObjectStore owns the association of some ObjectBase and
// ObjectHandles. The lifetime of the ObjectBase is then owned by the ObjectStore, destruction
// happening when Free is called.
//
// Since the wire has one "ID" namespace per type of object, each ObjectStore should contain a
// single type of objects. However no templates are used because Client wraps ObjectStore and is
// type-generic, so ObjectStore is type-erased to only work on ObjectBase.
class ObjectStore {
  public:
    ObjectStore();

    ObjectHandle ReserveHandle();
    void Insert(std::unique_ptr<ObjectBase> obj);
    void Free(ObjectBase* obj);
    ObjectBase* Get(ObjectId id) const;

  private:
    uint32_t mCurrentId;
    std::vector<ObjectHandle> mFreeHandles;
    std::vector<std::unique_ptr<ObjectBase>> mObjects;
};

}  // namespace dawn::wire::client

#endif  // SRC_DAWN_WIRE_CLIENT_OBJECTSTORE_H_