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package org.directwebremoting.extend;

import org.directwebremoting.Container;
import org.directwebremoting.ServerContext;
import org.directwebremoting.ui.Callback;

/**
 * A class to help with the use of {@link Callback}s
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class TaskDispatcherFactory
{
    /**
     * Accessor for the current TaskDispatcher.
     * @return The current TaskDispatcher.
     */
    public static TaskDispatcher get()
    {
        return factory.get();
    }

    /**
     * Accessor for the current TaskDispatcher in more complex setups.
     * For some setups DWR may not be able to discover the correct environment
     * (i.e. ServletContext), so we need to tell it. This generally happens if
     * you have DWR configured twice in a single context. Unless you are writing
     * code that someone else will configure, it is probably safe to use the
     * simpler {@link #get()} method.
     * @param ctx The servlet context to allow us to bootstrap
     * @return The current TaskDispatcher.
     */
    public static TaskDispatcher get(ServerContext ctx)
    {
        return factory.get(ctx);
    }

    /**
     * Internal method to allow us to get the Builder from which we
     * will get TaskDispatcher objects.
     * Do NOT call this method from outside of DWR.
     * @param container ...
     * @return ...
     */
    public static TaskDispatcher attach(Container container)
    {
        return factory.attach(container);
    }

    private static final Factory factory = Factory.create(TaskDispatcherBuilder.class);

    /**
     * Hack to get around Generics not being implemented by erasure
     */
    public interface TaskDispatcherBuilder extends Builder
    {
    }
}