javax.websocket.WebSocketEndpoint Maven / Gradle / Ivy

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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package javax.websocket;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * This class level annotation declares that the class it decorates
 * is a web socket endpoint that will be deployed and made available in the URI-space
 * of a web socket server. The annotation allows the developer to
 * define the URL (or URI template) which this endpoint will be published, and other
 * important properties of the endpoint to the websocket runtime, such as the encoders
 * it uses to send messages. 

The annotated class
 * must have a public no-arg constructor.

 * 
 * For example: 


 * 

 *  @WebSocketEndpoint("/hello");

 * public class HelloServer {


 * 
 *   @WebSocketMessage

 *  public void processGreeting(String message, Session session) {

 *    System.out.println("Greeting received:" + message);

 *  }

 * }
 * 
 *
 * @author dannycoward
 * @since Draft 002
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface WebSocketEndpoint {

    /**
     * The URI or URI-template (level-1) where the endpoint will be deployed. The URI us relative to the
     * root of the web socket container and must begin with a leading "/". Trailing "/"'s are ignored. Examples:

     *  @WebSocketEndpoint("/chat") 

     *  @WebSocketEndpoint("/chat/{user}") 

     *  @WebSocketEndpoint("/booking/{privilege-level}") 

     * 
     *
     * @return the URI or URI-template
     */
    public String value();

    /**
     * The ordered array of web socket protocols this endpoint supports. For example, {'superchat', 'chat'}.
     *
     * @return the subprotocols
     */
    public String[] subprotocols() default {};

    /**
     * The ordered array of decoder classes this endpoint will use. For example,
     * if the developer has provided a MysteryObject decoder, this endpoint will be able to
     * receive MysteryObjects as web socket messages. The websocket runtime will use the first
     * decoder in the list able to decode a message, ignoring the remaining decoders.
     *
     * @return the decoders.
     */
    public Class[] decoders() default {};

    /**
     * The ordered array of encoder classes this endpoint will use. For example,
     * if the developer has provided a MysteryObject encoder, this class will be able to
     * send web socket messages in the form of MysteryObjects. The websocket runtime will use the first
     * encoder in the list able to encode a message, ignoring the remaining encoders.
     *
     * @return the encoders.
     */
    public Class[] encoders() default {};
}