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/*
* Copyright 2011 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.terminal;
import com.vaadin.terminal.gwt.server.ClientConnector;
/**
* An extension is an entity that is attached to a Component or another
* Extension and independently communicates between client and server.
* <p>
* An extension can only be attached once. It is not supported to move an
* extension from one target to another.
* <p>
* Extensions can use shared state and RPC in the same way as components.
*
* @author Vaadin Ltd
* @since 7.0.0
*/
public interface Extension extends ClientConnector {
/*
* Currently just an empty marker interface to distinguish between
* extensions and other connectors, e.g. components
*/
}
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