content/public/browser/browser_child_process_observer.h

   1 // Copyright 2013 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 CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_OBSERVER_H_
   6 #define CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_OBSERVER_H_
   7
   8 #include "content/common/content_export.h"
   9
  10 namespace content {
  11
  12 struct ChildProcessData;
  13
  14 // An observer API implemented by classes which are interested in browser child
  15 // process events. Note that render processes cannot be observed through this
  16 // interface; use RenderProcessHostObserver instead.
  17 class CONTENT_EXPORT BrowserChildProcessObserver {
  18  public:
  19   // Called when a child process host has connected to a child process.
  20   virtual void BrowserChildProcessHostConnected(const ChildProcessData& data) {}
  21
  22   // Called after a ChildProcessHost is disconnected from the child process.
  23   virtual void BrowserChildProcessHostDisconnected(
  24       const ChildProcessData& data) {}
  25
  26   // Called when a child process disappears unexpectedly as a result of a crash.
  27   virtual void BrowserChildProcessCrashed(const ChildProcessData& data) {}
  28
  29   // Called when an instance of a particular child is created in a page. If one
  30   // page contains several regions rendered by the same child, this will be
  31   // called once for each region during the page load.
  32   virtual void BrowserChildProcessInstanceCreated(
  33       const ChildProcessData& data) {}
  34
  35  protected:
  36   // The observer can be destroyed on any thread.
  37   virtual ~BrowserChildProcessObserver() {}
  38
  39   static void Add(BrowserChildProcessObserver* observer);
  40   static void Remove(BrowserChildProcessObserver* observer);
  41 };
  42
  43 }  // namespace content
  44
  45 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_OBSERVER_H_