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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESSES_API_H__
      6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESSES_API_H__
      7 #pragma once
      8 
      9 #include <set>
     10 #include <string>
     11 
     12 #include "chrome/browser/extensions/extension_function.h"
     13 #include "chrome/browser/task_manager/task_manager.h"
     14 #include "content/common/notification_registrar.h"
     15 
     16 // Observes the Task Manager and routes the notifications as events to the
     17 // extension system.
     18 class ExtensionProcessesEventRouter : public TaskManagerModelObserver {
     19  public:
     20   // Single instance of the event router.
     21   static ExtensionProcessesEventRouter* GetInstance();
     22 
     23   // Safe to call multiple times.
     24   void ObserveProfile(Profile* profile);
     25 
     26   // Called when an extension process wants to listen to process events.
     27   void ListenerAdded();
     28 
     29   // Called when an extension process with a listener exits or removes it.
     30   void ListenerRemoved();
     31 
     32  private:
     33   friend struct DefaultSingletonTraits<ExtensionProcessesEventRouter>;
     34 
     35   ExtensionProcessesEventRouter();
     36   virtual ~ExtensionProcessesEventRouter();
     37 
     38   // TaskManagerModelObserver methods.
     39   virtual void OnModelChanged() {}
     40   virtual void OnItemsChanged(int start, int length);
     41   virtual void OnItemsAdded(int start, int length) {}
     42   virtual void OnItemsRemoved(int start, int length) {}
     43 
     44   void DispatchEvent(Profile* profile,
     45                      const char* event_name,
     46                      const std::string& json_args);
     47 
     48   // Used for tracking registrations to process related notifications.
     49   NotificationRegistrar registrar_;
     50 
     51   // Registered profiles.
     52   typedef std::set<Profile*> ProfileSet;
     53   ProfileSet profiles_;
     54 
     55   // TaskManager to observe for updates.
     56   TaskManagerModel* model_;
     57 
     58   DISALLOW_COPY_AND_ASSIGN(ExtensionProcessesEventRouter);
     59 };
     60 
     61 
     62 // This extension function returns the Process object for the renderer process
     63 // currently in use by the specified Tab.
     64 class GetProcessIdForTabFunction : public SyncExtensionFunction {
     65   virtual ~GetProcessIdForTabFunction() {}
     66   virtual bool RunImpl();
     67   DECLARE_EXTENSION_FUNCTION_NAME("experimental.processes.getProcessIdForTab")
     68 };
     69 
     70 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESSES_API_H__
     71