63 lines
1.4 KiB
C++
63 lines
1.4 KiB
C++
/* -*- 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
|