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// Copyright (c) 2012 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_UI_HUNG_PLUGIN_TAB_HELPER_H_
#define CHROME_BROWSER_UI_HUNG_PLUGIN_TAB_HELPER_H_
#include <map>
#include "base/file_path.h"
#include "base/memory/linked_ptr.h"
#include "base/string16.h"
#include "base/time.h"
#include "base/timer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
class FilePath;
class InfoBarDelegate;
// Manages per-tab state with regard to hung plugins. This only handles
// Pepper plugins which we know are windowless. Hung NPAPI plugins (which
// may have native windows) can not be handled with infobars and have a
// separate OS-specific hang monitoring.
//
// Our job is:
// - Pop up an infobar when a plugin is hung.
// - Terminate the plugin process if the user so chooses.
// - Periodically re-show the hung plugin infobar if the user closes it without
// terminating the plugin.
// - Hide the infobar if the plugin starts responding again.
// - Keep track of all of this for any number of plugins.
class HungPluginTabHelper
: public content::WebContentsObserver,
public content::NotificationObserver,
public content::WebContentsUserData<HungPluginTabHelper> {
public:
virtual ~HungPluginTabHelper();
// content::WebContentsObserver overrides:
virtual void PluginCrashed(const FilePath& plugin_path,
base::ProcessId plugin_pid) OVERRIDE;
virtual void PluginHungStatusChanged(int plugin_child_id,
const FilePath& plugin_path,
bool is_hung) OVERRIDE;
// NotificationObserver overrides.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Called by an infobar when the user selects to kill the plugin.
void KillPlugin(int child_id);
private:
explicit HungPluginTabHelper(content::WebContents* contents);
friend class content::WebContentsUserData<HungPluginTabHelper>;
// Per-plugin state (since there could be more than one plugin hung). The
// integer key is the child process ID of the plugin process. This maintains
// the state for all plugins on this page that are currently hung, whether or
// not we're currently showing the infobar.
struct PluginState {
// Initializes the plugin state to be a hung plugin.
PluginState(const FilePath& p, const string16& n);
~PluginState();
FilePath path;
string16 name;
// Possibly-null if we're not showing an infobar right now.
InfoBarDelegate* info_bar;
// Time to delay before re-showing the infobar for a hung plugin. This is
// increased each time the user cancels it.
base::TimeDelta next_reshow_delay;
// Handles calling the helper when the infobar should be re-shown.
base::Timer timer;
private:
// Since the scope of the timer manages our callback, this struct should
// not be copied.
DISALLOW_COPY_AND_ASSIGN(PluginState);
};
typedef std::map<int, linked_ptr<PluginState> > PluginStateMap;
// Called on a timer for a hung plugin to re-show the bar.
void OnReshowTimer(int child_id);
// Shows the bar for the plugin identified by the given state, updating the
// state accordingly. The plugin must not have an infobar already.
void ShowBar(int child_id, PluginState* state);
// Closes the infobar associated with the given state. Note that this can
// be called even if the bar is not opened, in which case it will do nothing.
void CloseBar(PluginState* state);
content::NotificationRegistrar registrar_;
// All currently hung plugins.
PluginStateMap hung_plugins_;
DISALLOW_COPY_AND_ASSIGN(HungPluginTabHelper);
};
#endif // CHROME_BROWSER_UI_HUNG_PLUGIN_TAB_HELPER_H_
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