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JSR 356: Java API for WebSocket
There is a newer version: 1.1
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package javax.websocket;

import java.util.List;
import java.util.Map;

/**
 * The endpoint configuration contains all the information needed during the handshake process
 * for this end point. All endpoints specify, for example, a URI. In the case of a server endpoint,
 * the URI signifies the URI to which the endpoint will be mapped. In the case of a client application
 * the URI signifies the URI of the server to which the client endpoint will attempt to connect.
 *
 * @author dannycoward
 */
public interface EndpointConfig {

    /**
     * Return the Encoder implementation classes configured. These
     * will be instantiated by the container to encode custom objects passed into
     * the send() methods on remote endpoints.
     *
     * @return the encoder implementation classes, an empty list if none.
     */
    List> getEncoders();

    /**
     * Return the Decoder implementation classes configured. These
     * will be instantiated by the container to decode incoming messages
     * into the expected custom objects on {@link MessageHandler.Whole#onMessage(Object)}
     * callbacks.
     *
     * @return the decoder implementation classes, the empty list if none.
     */
    List> getDecoders();
    
    /**
     * This method returns a modifiable Map that the developer may use to store application
     * specific information relating to the endpoint that uses this
     * configuration instance. Web socket applications running on distributed 
     * implementations of the web container should make any application 
     * specific objects stored here java.io.Serializable, or the object may 
     * not be recreated after a failover.
     *
     * @return a modifiable Map of application data.
     */ 
     Map getUserProperties();
}