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/*
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All rights reserved.
Copyright (C) 2010 Google Inc. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef ResourceLoadScheduler_h
#define ResourceLoadScheduler_h
#include "FrameLoaderTypes.h"
#include "ResourceLoaderOptions.h"
#include "ResourceLoadPriority.h"
#include "Timer.h"
#include <wtf/Deque.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class CachedResource;
class Frame;
class URL;
class NetscapePlugInStreamLoader;
class NetscapePlugInStreamLoaderClient;
class ResourceLoader;
class ResourceRequest;
class SubresourceLoader;
class ResourceLoadScheduler {
WTF_MAKE_NONCOPYABLE(ResourceLoadScheduler); WTF_MAKE_FAST_ALLOCATED;
public:
friend ResourceLoadScheduler* resourceLoadScheduler();
virtual PassRefPtr<SubresourceLoader> scheduleSubresourceLoad(Frame*, CachedResource*, const ResourceRequest&, ResourceLoadPriority, const ResourceLoaderOptions&);
virtual PassRefPtr<NetscapePlugInStreamLoader> schedulePluginStreamLoad(Frame*, NetscapePlugInStreamLoaderClient*, const ResourceRequest&);
virtual void remove(ResourceLoader*);
virtual void crossOriginRedirectReceived(ResourceLoader*, const URL& redirectURL);
virtual void servePendingRequests(ResourceLoadPriority minimumPriority = ResourceLoadPriorityVeryLow);
virtual void suspendPendingRequests();
virtual void resumePendingRequests();
bool isSerialLoadingEnabled() const { return m_isSerialLoadingEnabled; }
virtual void setSerialLoadingEnabled(bool b) { m_isSerialLoadingEnabled = b; }
class Suspender {
public:
explicit Suspender(ResourceLoadScheduler& scheduler) : m_scheduler(scheduler) { m_scheduler.suspendPendingRequests(); }
~Suspender() { m_scheduler.resumePendingRequests(); }
private:
ResourceLoadScheduler& m_scheduler;
};
protected:
ResourceLoadScheduler();
virtual ~ResourceLoadScheduler();
void notifyDidScheduleResourceRequest(ResourceLoader*);
private:
void scheduleLoad(ResourceLoader*, ResourceLoadPriority);
void scheduleServePendingRequests();
void requestTimerFired(Timer<ResourceLoadScheduler>&);
bool isSuspendingPendingRequests() const { return !!m_suspendPendingRequestsCount; }
class HostInformation {
WTF_MAKE_NONCOPYABLE(HostInformation); WTF_MAKE_FAST_ALLOCATED;
public:
HostInformation(const String&, unsigned);
~HostInformation();
const String& name() const { return m_name; }
void schedule(ResourceLoader*, ResourceLoadPriority = ResourceLoadPriorityVeryLow);
void addLoadInProgress(ResourceLoader*);
void remove(ResourceLoader*);
bool hasRequests() const;
bool limitRequests(ResourceLoadPriority) const;
typedef Deque<RefPtr<ResourceLoader>> RequestQueue;
RequestQueue& requestsPending(ResourceLoadPriority priority) { return m_requestsPending[priority]; }
private:
RequestQueue m_requestsPending[ResourceLoadPriorityHighest + 1];
typedef HashSet<RefPtr<ResourceLoader>> RequestMap;
RequestMap m_requestsLoading;
const String m_name;
const int m_maxRequestsInFlight;
};
enum CreateHostPolicy {
CreateIfNotFound,
FindOnly
};
HostInformation* hostForURL(const URL&, CreateHostPolicy = FindOnly);
void servePendingRequests(HostInformation*, ResourceLoadPriority);
typedef HashMap<String, HostInformation*, StringHash> HostMap;
HostMap m_hosts;
HostInformation* m_nonHTTPProtocolHost;
Timer<ResourceLoadScheduler> m_requestTimer;
unsigned m_suspendPendingRequestsCount;
bool m_isSerialLoadingEnabled;
};
ResourceLoadScheduler* resourceLoadScheduler();
}
#endif
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