Source/WebKit2/NetworkProcess/HostRecord.h

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef HostRecord_h
#define HostRecord_h

#if ENABLE(NETWORK_PROCESS)

#include <WebCore/ResourceLoadPriority.h>
#include <wtf/Deque.h>
#include <wtf/HashSet.h>
#include <wtf/RefCounted.h>
#include <wtf/text/WTFString.h>

namespace WebKit {

class NetworkResourceLoader;
class SchedulableLoader;
class SyncNetworkResourceLoader;
typedef uint64_t ResourceLoadIdentifier;

class HostRecord : public RefCounted<HostRecord> {
public:
    static PassRefPtr<HostRecord> create(const String& name, int maxRequestsInFlight)
    {
        return adoptRef(new HostRecord(name, maxRequestsInFlight));
    }
    
    ~HostRecord();
    
    const String& name() const { return m_name; }
    
    void scheduleResourceLoader(PassRefPtr<SchedulableLoader>);
    void addLoaderInProgress(SchedulableLoader*);
    void removeLoader(SchedulableLoader*);
    bool hasRequests() const;
    void servePendingRequests(WebCore::ResourceLoadPriority);

    uint64_t pendingRequestCount() const;
    uint64_t activeLoadCount() const;

private:
    HostRecord(const String& name, int maxRequestsInFlight);

    typedef Deque<RefPtr<SchedulableLoader> > LoaderQueue;

    void servePendingRequestsForQueue(LoaderQueue&, WebCore::ResourceLoadPriority);
    bool limitsRequests(WebCore::ResourceLoadPriority, bool serialLoadingEnabled) const;

    LoaderQueue m_loadersPending[WebCore::ResourceLoadPriorityHighest + 1];
    LoaderQueue m_syncLoadersPending;

    typedef HashSet<RefPtr<SchedulableLoader> > SchedulableLoaderSet;
    SchedulableLoaderSet m_loadersInProgress;

    const String m_name;
    int m_maxRequestsInFlight;
};

} // namespace WebKit

#endif // ENABLE(NETWORK_PROCESS)

#endif // #ifndef HostRecord_h