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Geomajas GWT2 client: Main - Server Extension
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/*
 * This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
 *
 * Copyright 2008-2015 Geosparc nv, http://www.geosparc.com/, Belgium.
 *
 * The program is available in open source according to the GNU Affero
 * General Public License. All contributions in this program are covered
 * by the Geomajas Contributors License Agreement. For full licensing
 * details, see LICENSE.txt in the project root.
 */
package org.geomajas.gwt2.client.service;

import org.geomajas.annotation.Api;
import org.geomajas.gwt.client.command.CommandCallback;
import org.geomajas.gwt.client.command.Deferred;
import org.geomajas.gwt.client.command.GwtCommand;
import org.geomajas.gwt.client.command.TokenRequestHandler;
import org.geomajas.gwt.client.command.event.TokenChangedHandler;

import com.google.gwt.event.shared.HandlerRegistration;

/**
 * The central client side dispatcher service for all commands. Use the {@link #execute(GwtCommand, CommandCallback...)}
 * function to execute an asynchronous command on the server.
 * 
 * 
 * @author Jan De Moerloose
 * @since 2.0.0
 */
@Api(allMethods = true)
public interface CommandService {

	/**
	 * The execution function. Executes a server side command.
	 * 
	 * @param command
	 *            The command to be executed. This command is a wrapper around the actual request object.
	 * @param callback
	 *            A CommandCallback function to be executed when the command successfully returns. The
	 *            callbacks may implement CommunicationExceptionCallback or CommandExceptionCallback to allow error
	 *            handling.
	 * @return deferred object which can be used to add extra callbacks
	 * @since 2.0.0
	 */
	Deferred execute(final GwtCommand command, final CommandCallback... callback);

	/**
	 * Request a user login. Requests a new user token to be obtained.
	 * 
	 * @since 2.0.0
	 */
	void login();

	/**
	 * Invalidate the current user token. This may automatically force a requests for a new user token to be obtained.
	 * 
	 * @since 2.0.0
	 */
	void logout();

	/**
	 * Get the user token.
	 * 
	 * @return user token
	 * @since 2.0.0
	 */
	String getUserToken();

	/**
	 * Add handler which is notified when the user token changes.
	 * 
	 * @param handler
	 *            token changed handler
	 * @return handler registration
	 * @since 2.0.0
	 */
	HandlerRegistration addTokenChangedHandler(TokenChangedHandler handler);

	/**
	 * Set the login handler which should be used to request a user token.
	 * 
	 * @param tokenRequestHandler
	 *            login handler
	 * @since 2.0.0
	 */
	void setTokenRequestHandler(TokenRequestHandler tokenRequestHandler);
}