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package org.glassfish.sse.api;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
/**
* A handler that handles Server-Sent Events.
*
* @see ServerSentEvent
* @author Jitendra Kotamraju
*/
public abstract class ServerSentEventHandler {
protected ServerSentEventConnection connection;
public enum Status { DONT_RECONNECT, OK }
/**
* A callback to indicate that a client connects to receive Server-Sent Events.
* The application has full access to HTTP request and can decide whether
* to accept the connection or reject it. In SSE, clients will reconnect
* if the connection is closed, but can be told to stop reconnecting by
* returning the appropriate status.
*
*
* Last-Event-ID may be used in determining the status and it can be
* got using {@code HttpServletRequest.getHeader("Last-Event-ID")}
*
* @param request connection request
* @return Status to accept, or don't reconnect etc
*/
public Status onConnecting(HttpServletRequest request) {
return Status.OK;
}
/**
* A callback to indicate that a client connects to receive Server-Sent Events.
* The application has full access to HTTP request and can decide whether
* to accept the connection or reject it. In SSE, clients will reconnect
* if the connection is closed, but can be told to stop reconnecting by
* returning the appropriate status.
*
* @param connection Server-Sert event connection
* @return Status to accept, or don't reconnect etc
*/
public void onConnected(ServerSentEventConnection connection) {
this.connection = connection;
}
/**
* Callback to indicate that the client closed the connection
*/
public void onClosed() {
}
}