WorkerContextExecutionProxy.h   [plain text]

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * in the documentation and/or other materials provided with the
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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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#ifndef WorkerContextExecutionProxy_h
#define WorkerContextExecutionProxy_h

#if ENABLE(WORKERS)

#include <v8.h>
#include "V8EventListenerList.h"
#include "V8Index.h"
#include <wtf/OwnPtr.h>
#include <wtf/Vector.h>

namespace WebCore {

    class Event;
    class EventTarget;
    class V8EventListener;
    class V8WorkerContextEventListener;
    class WorkerContext;

    class WorkerContextExecutionProxy {
    public:
        WorkerContextExecutionProxy(WorkerContext*);
        ~WorkerContextExecutionProxy();

        // FIXME: following function sshould have camelCased names once V8 code-generating script is migrated.
        v8::Local<v8::Context> GetContext() { return v8::Local<v8::Context>::New(m_context); }
        v8::Local<v8::Function> GetConstructor(V8ClassIndex::V8WrapperType);
        void RemoveEventListener(V8EventListener*);

        static v8::Handle<v8::Value> ToV8Object(V8ClassIndex::V8WrapperType type, void* impl);
        static v8::Handle<v8::Value> EventToV8Object(Event* event);
        static v8::Handle<v8::Value> EventTargetToV8Object(EventTarget* target);
        static v8::Handle<v8::Value> WorkerContextToV8Object(WorkerContext* wc);

        // Finds/creates event listener wrappers.
        PassRefPtr<V8EventListener> findOrCreateEventListener(v8::Local<v8::Value> listener, bool isInline, bool findOnly);
        PassRefPtr<V8EventListener> findOrCreateObjectEventListener(v8::Local<v8::Value> object, bool isInline, bool findOnly);

        // Track the event so that we can detach it from the JS wrapper when a worker
        // terminates. This is needed because we need to be able to dispose these
        // events and releases references to their event targets: WorkerContext.
        void trackEvent(Event*);

        // Evaluate a script file in the current execution environment.
        v8::Local<v8::Value> evaluate(const String& script, const String& fileName, int baseLine);

        // Returns WorkerContext object.
        WorkerContext* workerContext() { return m_workerContext; }

        // Returns WorkerContextExecutionProxy object of the currently executing context. 0 will be returned if the current executing context is not the worker context.
        static WorkerContextExecutionProxy* retrieve();

        // Enables HTML5 worker support.
        static bool isWebWorkersEnabled();
        static void setIsWebWorkersEnabled(bool);

    private:
        void initV8IfNeeded();
        void initContextIfNeeded();
        void dispose();
        PassRefPtr<V8EventListener> findOrCreateEventListenerHelper(v8::Local<v8::Value> object, bool isInline, bool findOnly, bool createObjectEventListener);

        // Run an already compiled script.
        v8::Local<v8::Value> runScript(v8::Handle<v8::Script>);

        static v8::Local<v8::Object> toV8(V8ClassIndex::V8WrapperType descType, V8ClassIndex::V8WrapperType cptrType, void* impl);

        static bool forgetV8EventObject(Event*);

        WorkerContext* m_workerContext;
        v8::Persistent<v8::Context> m_context;
        int m_recursion;

        OwnPtr<V8EventListenerList> m_listeners;
        Vector<Event*> m_events;
    };

} // namespace WebCore

#endif // ENABLE(WORKERS)

#endif // WorkerContextExecutionProxy_h