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// 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 "base/scoped_ptr.h"
#include "base/waitable_event_watcher.h"
#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
#include "chrome/common/child_process_info.h"
#include "ipc/ipc_channel.h"
class NotificationType;
// Plugins/workers and other child processes that live on the IO thread should
// derive from this class.
class ChildProcessHost : public ResourceDispatcherHost::Receiver,
public base::WaitableEventWatcher::Delegate,
public IPC::Channel::Listener {
public:
virtual ~ChildProcessHost();
// ResourceDispatcherHost::Receiver implementation:
virtual bool Send(IPC::Message* msg);
// The Iterator class allows iteration through either all child processes, or
// ones of a specific type, depending on which constructor is used. Note that
// this should be done from the IO thread and that the iterator should not be
// kept around as it may be invalidated on subsequent event processing in the
// event loop.
class Iterator {
public:
Iterator();
Iterator(ProcessType type);
ChildProcessHost* operator->() { return *iterator_; }
ChildProcessHost* operator*() { return *iterator_; }
ChildProcessHost* operator++();
bool Done();
private:
bool all_;
ProcessType type_;
std::list<ChildProcessHost*>::iterator iterator_;
};
protected:
ChildProcessHost(ProcessType type,
ResourceDispatcherHost* resource_dispatcher_host);
// 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();
// Once the subclass gets a handle to the process, it needs to tell
// ChildProcessHost using this function.
void SetHandle(base::ProcessHandle handle);
// Notifies us that an instance has been created on this child process.
void InstanceCreated();
// IPC::Channel::Listener implementation:
virtual void OnMessageReceived(const IPC::Message& msg) { }
virtual void OnChannelConnected(int32 peer_pid) { }
virtual void OnChannelError() { }
bool opening_channel() { return opening_channel_; }
const std::wstring& channel_id() { return channel_id_; }
private:
// Sends the given notification to the notification service on the UI thread.
void Notify(NotificationType type);
// WaitableEventWatcher::Delegate implementation:
virtual void OnWaitableEventSignaled(base::WaitableEvent *event);
// 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:
ListenerHook(ChildProcessHost* host);
virtual void OnMessageReceived(const IPC::Message& msg);
virtual void OnChannelConnected(int32 peer_pid);
virtual void OnChannelError();
private:
ChildProcessHost* host_;
};
ListenerHook listener_;
ResourceDispatcherHost* resource_dispatcher_host_;
// True while we're waiting the channel to be opened.
bool opening_channel_;
// The IPC::Channel.
scoped_ptr<IPC::Channel> channel_;
// IPC Channel's id.
std::wstring channel_id_;
// Used to watch the child process handle.
base::WaitableEventWatcher watcher_;
scoped_ptr<base::WaitableEvent> process_event_;
};
#endif // CHROME_COMMON_CHILD_PROCESS_HOST_H_
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