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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_LAYERS_IPDLACTOR_H
#define MOZILLA_LAYERS_IPDLACTOR_H
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/layers/CompositableForwarder.h"
#include "mozilla/Unused.h"
#include "gfxPlatform.h"
namespace mozilla {
namespace layers {
/// A base class to facilitate the deallocation of IPDL actors.
///
/// Implements the parent side of the simple deallocation handshake.
/// Override the Destroy method rather than the ActorDestroy method.
template<typename Protocol>
class ParentActor : public Protocol
{
public:
ParentActor() : mDestroyed(false) {}
~ParentActor() { MOZ_ASSERT(mDestroyed); }
bool CanSend() const { return !mDestroyed; }
// Override this rather than ActorDestroy
virtual void Destroy() {}
virtual bool RecvDestroy() override
{
DestroyIfNeeded();
Unused << Protocol::Send__delete__(this);
return true;
}
typedef ipc::IProtocol::ActorDestroyReason Why;
virtual void ActorDestroy(Why) override {
DestroyIfNeeded();
}
protected:
void DestroyIfNeeded() {
if (!mDestroyed) {
Destroy();
mDestroyed = true;
}
}
private:
bool mDestroyed;
};
} // namespace
} // namespace
#endif
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