ThreadableLoader.h   [plain text]


/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 *     * 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.
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 * 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
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef ThreadableLoader_h
#define ThreadableLoader_h

#include "ResourceLoaderOptions.h"
#include <wtf/Noncopyable.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomicString.h>

namespace WebCore {

    class ResourceError;
    class ResourceRequest;
    class ResourceResponse;
    class ScriptExecutionContext;
    class SecurityOrigin;
    class ThreadableLoaderClient;
    
    enum CrossOriginRequestPolicy {
        DenyCrossOriginRequests,
        UseAccessControl,
        AllowCrossOriginRequests
    };

    enum PreflightPolicy {
        ConsiderPreflight,
        ForcePreflight,
        PreventPreflight
    };

    struct ThreadableLoaderOptions : ResourceLoaderOptions {
        ThreadableLoaderOptions();
        ThreadableLoaderOptions(const ResourceLoaderOptions&, PreflightPolicy, CrossOriginRequestPolicy, RefPtr<SecurityOrigin>&&, String&& initiator);
        ~ThreadableLoaderOptions();

        std::unique_ptr<ThreadableLoaderOptions> isolatedCopy() const;

        PreflightPolicy preflightPolicy; // If AccessControl is used, how to determine if a preflight is needed.
        CrossOriginRequestPolicy crossOriginRequestPolicy;
        RefPtr<SecurityOrigin> securityOrigin;
        String initiator; // This cannot be an AtomicString, as isolatedCopy() wouldn't create an object that's safe for passing to another thread.
    };

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

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

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

} // namespace WebCore

#endif // ThreadableLoader_h