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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.server;
-
-
- /**
- * 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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