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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: */
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_COMMON_CHILD_PROCESS_HOST_H_
#define CHROME_COMMON_CHILD_PROCESS_HOST_H_
#include "build/build_config.h"
#include <list>
#include "base/basictypes.h"
#include "chrome/common/ipc_channel.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
namespace ipc {
class FileDescriptor;
}
} // namespace mozilla
// Plugins/workers and other child processes that live on the IO thread should
// derive from this class.
class ChildProcessHost : public IPC::Channel::Listener {
public:
virtual ~ChildProcessHost();
using ChannelId = IPC::Channel::ChannelId;
protected:
explicit ChildProcessHost();
// Derived classes return true if it's ok to shut down the child process.
virtual bool CanShutdown() = 0;
// Creates the IPC channel. Returns true iff it succeeded.
bool CreateChannel();
// IPC::Channel::Listener implementation:
virtual void OnMessageReceived(
mozilla::UniquePtr<IPC::Message> msg) override {}
virtual void OnChannelConnected(base::ProcessId peer_pid) override {}
virtual void OnChannelError() override {}
bool opening_channel() { return opening_channel_; }
const ChannelId& channel_id() { return channel_id_; }
IPC::Channel* channelp() const { return channel_.get(); }
mozilla::UniquePtr<IPC::Channel> TakeChannel() { return std::move(channel_); }
private:
// By using an internal class as the IPC::Channel::Listener, we can intercept
// OnMessageReceived/OnChannelConnected and do our own processing before
// calling the subclass' implementation.
class ListenerHook : public IPC::Channel::Listener {
public:
explicit ListenerHook(ChildProcessHost* host);
virtual void OnMessageReceived(
mozilla::UniquePtr<IPC::Message> msg) override;
virtual void OnChannelConnected(base::ProcessId peer_pid) override;
virtual void OnChannelError() override;
virtual void GetQueuedMessages(
std::queue<mozilla::UniquePtr<IPC::Message>>& queue) override;
private:
ChildProcessHost* host_;
};
ListenerHook listener_;
// True while we're waiting the channel to be opened.
bool opening_channel_;
// The IPC::Channel.
mozilla::UniquePtr<IPC::Channel> channel_;
// IPC Channel's id.
ChannelId channel_id_;
};
#endif // CHROME_COMMON_CHILD_PROCESS_HOST_H_
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