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// Copyright 2014 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_TRANSITION_REQUEST_MANAGER_H_
#define CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_
#include <set>
#include <utility>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "url/gurl.h"
template <typename T>
struct DefaultSingletonTraits;
namespace net {
class HttpResponseHeaders;
}
namespace content {
// TransitionRequestManager is used to handle bookkeeping for transition
// requests and responses.
//
// TransitionRequestManager is a singleton and should only be accessed on the IO
// thread.
//
class TransitionRequestManager {
public:
// Returns the singleton instance.
CONTENT_EXPORT static TransitionRequestManager* GetInstance();
// Parses out any transition-entering-stylesheet link headers from the
// response headers.
CONTENT_EXPORT static void ParseTransitionStylesheetsFromHeaders(
const scoped_refptr<net::HttpResponseHeaders>& headers,
std::vector<GURL>& entering_stylesheets,
const GURL& resolve_address);
// Returns whether the RenderFrameHost specified by the given IDs currently
// has a pending transition request. If so, we will have to delay the
// response until the embedder resumes the request.
bool HasPendingTransitionRequest(int process_id, int render_frame_id);
// Sets whether the RenderFrameHost specified by the given IDs currently has a
// pending transition request.
CONTENT_EXPORT void SetHasPendingTransitionRequest(int process_id,
int render_frame_id,
bool has_pending);
private:
friend struct DefaultSingletonTraits<TransitionRequestManager>;
typedef std::set<std::pair<int, int> > RenderFrameSet;
TransitionRequestManager();
~TransitionRequestManager();
// Set of (render_process_host_id, render_frame_id) pairs of all
// RenderFrameHosts that have pending transition requests. Used to pass
// information to the CrossSiteResourceHandler without doing a round-trip
// between IO->UI->IO threads.
RenderFrameSet pending_transition_frames_;
DISALLOW_COPY_AND_ASSIGN(TransitionRequestManager);
};
} // namespace content
#endif // CONTENT_BROWSER_TRANSITION_REQUEST_MANAGER_H_
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