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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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() {}
mozilla::ipc::IPCResult RecvDestroy() final {
DestroyIfNeeded();
Unused << Protocol::Send__delete__(this);
return IPC_OK();
}
typedef ipc::IProtocol::ActorDestroyReason Why;
void ActorDestroy(Why) override { DestroyIfNeeded(); }
protected:
void DestroyIfNeeded() {
if (!mDestroyed) {
Destroy();
mDestroyed = true;
}
}
private:
bool mDestroyed;
};
} // namespace layers
} // namespace mozilla
#endif
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