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