Refactor ChildProcess and related classes to create a framework outside of br...

chrome/browser/child_process_host.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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_BROWSER_CHILD_PROCESS_HOST_H_
 #define CHROME_BROWSER_CHILD_PROCESS_HOST_H_
 
 #include <list>
 #include <string>
 
 // Must be included early (e.g. before chrome/common/plugin_messages.h)
 #include "ipc/ipc_logging.h"
 
 #include "base/basictypes.h"
+#include "base/mp/mp_child_process_host.h"
+#include "base/mp/mp_child_process_launcher.h"
 #include "base/scoped_ptr.h"
-#include "chrome/browser/child_process_launcher.h"
+#include "chrome/browser/child_process_context.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "ipc/ipc_channel.h"
 
 class CommandLine;
 class NotificationType;
 
 // Plugins/workers and other child processes that live on the IO thread should
 // derive from this class.
 //
 // [Browser]RenderProcessHost is the main exception that doesn't derive from
 // this class. That project lives on the UI thread.
 class ChildProcessHost : public ResourceDispatcherHost::Receiver,
-                         public IPC::Channel::Listener,
-                         public ChildProcessLauncher::Client {
+                         public base::MpChildProcessHost {
  public:
   virtual ~ChildProcessHost();
 
   // Returns the pathname to be used for a child process.  If a subprocess
   // pathname was specified on the command line, that will be used.  Otherwise,
   // the default child process pathname will be returned.  On most platforms,
   // this will be the same as the currently-executing process.
   //
   // The argument allow_self is used on Linux to indicate that we allow us to
   // fork from /proc/self/exe rather than using the "real" app path. This
@@ skipping 35 matching lines @@
     ProcessType type_;
     std::list<ChildProcessHost*>::iterator iterator_;
   };
 
  protected:
   // The resource_dispatcher_host may be NULL to indicate none is needed for
   // this process type.
   ChildProcessHost(ProcessType type,
                    ResourceDispatcherHost* resource_dispatcher_host);
 
-  // Derived classes call this to launch the child process asynchronously.
-  void Launch(
-#if defined(OS_WIN)
-      const FilePath& exposed_dir,
-#elif defined(OS_POSIX)
-      bool use_zygote,
-      const base::environment_vector& environ,
-#endif
-      CommandLine* cmd_line);
+ private:
+  // base::MpChildProcessHost implementation:
+  virtual void Notify(base::MpChildProcessHost::MpNotificationType type);
 
-  // Derived classes return true if it's ok to shut down the child process.
-  virtual bool CanShutdown() = 0;
+  virtual bool OnDispatchMessageReceived(const IPC::Message& msg,
+                                         bool *msg_is_ok);
 
-  // Send the shutdown message to the child process, and remove this host from
-  // the host list. Does not check if CanShutdown is true.
-  void ForceShutdown();
+  virtual void OnProcessLaunched();
 
-  // Creates the IPC channel.  Returns true iff it succeeded.
-  bool CreateChannel();
-
-  // 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() { }
-
-  // ChildProcessLauncher::Client implementation.
-  virtual void OnProcessLaunched() {}
-
-  // Derived classes can override this to know if the process crashed.
-  virtual void OnProcessCrashed() {}
-
-  bool opening_channel() { return opening_channel_; }
-  const std::string& channel_id() { return channel_id_; }
-
-  virtual bool DidChildCrash();
-
-  // Called when the child process goes away.
-  virtual void OnChildDied();
-
- private:
-  // Sends the given notification to the notification service on the UI thread.
-  void Notify(NotificationType type);
-
-  // 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 ChildProcessLauncher::Client {
-   public:
-    explicit ListenerHook(ChildProcessHost* host);
-    virtual void OnMessageReceived(const IPC::Message& msg);
-    virtual void OnChannelConnected(int32 peer_pid);
-    virtual void OnChannelError();
-    virtual void OnProcessLaunched();
-   private:
-    ChildProcessHost* host_;
-  };
-
-  ListenerHook listener_;
+  virtual int GetType();
 
   // May be NULL if this current process has no resource dispatcher host.
   ResourceDispatcherHost* resource_dispatcher_host_;
-
-  bool opening_channel_;  // True while we're waiting the channel to be opened.
-  scoped_ptr<IPC::Channel> channel_;
-  std::string channel_id_;
-  scoped_ptr<ChildProcessLauncher> child_process_;
+  ChildProcessContext context_;
 };
 
 #endif  // CHROME_BROWSER_CHILD_PROCESS_HOST_H_