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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 CONTENT_BROWSER_CROSS_SITE_REQUEST_MANAGER_H_
#define CONTENT_BROWSER_CROSS_SITE_REQUEST_MANAGER_H_
#include <set>
#include <utility>
#include "base/basictypes.h"
#include "base/synchronization/lock.h"
template <typename T> struct DefaultSingletonTraits;
namespace content {
// CrossSiteRequestManager is used to handle bookkeeping for cross-site
// requests and responses between the UI and IO threads. Such requests involve
// a transition from one RenderViewHost to another within WebContentsImpl, and
// involve coordination with ResourceDispatcherHost.
//
// CrossSiteRequestManager is a singleton that may be used on any thread.
//
class CrossSiteRequestManager {
public:
// Returns the singleton instance.
static CrossSiteRequestManager* GetInstance();
// Returns whether the RenderViewHost specified by the given IDs currently
// has a pending cross-site request. If so, we will have to delay the
// response until the previous RenderViewHost runs its onunload handler.
// Called by ResourceDispatcherHost on the IO thread and RenderViewHost on
// the UI thread.
bool HasPendingCrossSiteRequest(int renderer_id, int render_view_id);
// Sets whether the RenderViewHost specified by the given IDs currently has a
// pending cross-site request. Called by RenderViewHost on the UI thread.
void SetHasPendingCrossSiteRequest(int renderer_id,
int render_view_id,
bool has_pending);
private:
friend struct DefaultSingletonTraits<CrossSiteRequestManager>;
typedef std::set<std::pair<int, int> > RenderViewSet;
CrossSiteRequestManager();
~CrossSiteRequestManager();
// You must acquire this lock before reading or writing any members of this
// class. You must not block while holding this lock.
base::Lock lock_;
// Set of (render_process_host_id, render_view_id) pairs of all
// RenderViewHosts that have pending cross-site requests. Used to pass
// information about the RenderViewHosts between the UI and IO threads.
RenderViewSet pending_cross_site_views_;
DISALLOW_COPY_AND_ASSIGN(CrossSiteRequestManager);
};
} // namespace content
#endif // CONTENT_BROWSER_CROSS_SITE_REQUEST_MANAGER_H_
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