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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MOJO_PUBLIC_CPP_SYSTEM_SCOPE_TO_MESSAGE_PIPE_H_
#define MOJO_PUBLIC_CPP_SYSTEM_SCOPE_TO_MESSAGE_PIPE_H_
#include <memory>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "mojo/public/cpp/system/message_pipe.h"
#include "mojo/public/cpp/system/simple_watcher.h"
#include "mojo/public/cpp/system/system_export.h"
namespace mojo {
namespace internal {
// Owns the state and details to implement ScopeToMessagePipe (see below).
class MOJO_CPP_SYSTEM_EXPORT MessagePipeScoperBase {
public:
explicit MessagePipeScoperBase(ScopedMessagePipeHandle pipe);
MessagePipeScoperBase(const MessagePipeScoperBase&) = delete;
MessagePipeScoperBase& operator=(const MessagePipeScoperBase&) = delete;
virtual ~MessagePipeScoperBase();
static void StartWatchingPipe(std::unique_ptr<MessagePipeScoperBase> scoper);
private:
ScopedMessagePipeHandle pipe_;
SimpleWatcher pipe_watcher_;
};
template <typename T>
class MessagePipeScoper : public MessagePipeScoperBase {
public:
explicit MessagePipeScoper(T scoped_object, ScopedMessagePipeHandle pipe)
: MessagePipeScoperBase(std::move(pipe)),
scoped_object_(std::move(scoped_object)) {}
MessagePipeScoper(const MessagePipeScoper&) = delete;
MessagePipeScoper& operator=(const MessagePipeScoper&) = delete;
~MessagePipeScoper() override = default;
private:
T scoped_object_;
};
} // namespace internal
// Binds the lifetime of |object| to that of |pipe|'s connection. When |pipe|'s
// peer is closed, |pipe| will be closed and |object| will be destroyed. This
// can be useful as a simple mechanism to track object lifetime across process
// boundaries.
template <typename T>
void ScopeToMessagePipe(T object, ScopedMessagePipeHandle pipe) {
internal::MessagePipeScoperBase::StartWatchingPipe(
std::make_unique<internal::MessagePipeScoper<T>>(std::move(object),
std::move(pipe)));
}
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_SYSTEM_SCOPE_TO_MESSAGE_PIPE_H_
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