threadableloader.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2009 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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,
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 */

#ifndef ThreadableLoader_h
#define ThreadableLoader_h

#include <wtf/Noncopyable.h>
#include <wtf/PassRefPtr.h>
#include <wtf/Vector.h>

namespace WebCore {

    class ResourceError;
    struct ResourceRequest;
    class ResourceResponse;
    class ScriptExecutionContext;
    class ThreadableLoaderClient;

    enum LoadCallbacks {
        SendLoadCallbacks,
        DoNotSendLoadCallbacks
    };

    enum ContentSniff {
        SniffContent,
        DoNotSniffContent
    };

    // Useful for doing loader operations from any thread (not threadsafe, 
    // just able to run on threads other than the main thread).
    class ThreadableLoader : Noncopyable {
    public:
        static void loadResourceSynchronously(ScriptExecutionContext*, const ResourceRequest&, ThreadableLoaderClient&);
        static PassRefPtr<ThreadableLoader> create(ScriptExecutionContext*, ThreadableLoaderClient*, const ResourceRequest&, LoadCallbacks, ContentSniff);

        virtual void cancel() = 0;
        void ref() { refThreadableLoader(); }
        void deref() { derefThreadableLoader(); }

    protected:
        virtual ~ThreadableLoader() { }
        virtual void refThreadableLoader() = 0;
        virtual void derefThreadableLoader() = 0;
    };

} // namespace WebCore

#endif // ThreadableLoader_h