package org.frameworkset.web.socket.sockjs.transport;
import java.util.Map;
import org.frameworkset.http.MediaType;
import org.frameworkset.http.ServerHttpRequest;
import org.frameworkset.web.socket.inf.WebSocketHandler;
import org.frameworkset.web.socket.sockjs.SockJsServiceConfig;
import org.frameworkset.web.socket.sockjs.TransportHandler;
import org.frameworkset.web.socket.sockjs.TransportType;
import org.frameworkset.web.socket.sockjs.frame.DefaultSockJsFrameFormat;
import org.frameworkset.web.socket.sockjs.frame.SockJsFrameFormat;
import org.frameworkset.web.socket.sockjs.session.StreamingSockJsSession;
/**
* A {@link TransportHandler} that sends messages over an HTTP streaming request.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class XhrStreamingTransportHandler extends AbstractHttpSendingTransportHandler {
private static final byte[] PRELUDE = new byte[2049];
static {
for (int i = 0; i < 2048; i++) {
PRELUDE[i] = 'h';
}
PRELUDE[2048] = '\n';
}
@Override
public TransportType getTransportType() {
return TransportType.XHR_STREAMING;
}
@Override
protected MediaType getContentType() {
return new MediaType("application", "javascript", UTF8_CHARSET);
}
@Override
public StreamingSockJsSession createSession(
String sessionId, WebSocketHandler handler, Map<String, Object> attributes) {
return new XhrStreamingSockJsSession(sessionId, getServiceConfig(), handler, attributes);
}
@Override
protected SockJsFrameFormat getFrameFormat(ServerHttpRequest request) {
return new DefaultSockJsFrameFormat("%s\n");
}
private class XhrStreamingSockJsSession extends StreamingSockJsSession {
public XhrStreamingSockJsSession(String sessionId, SockJsServiceConfig config,
WebSocketHandler wsHandler, Map<String, Object> attributes) {
super(sessionId, config, wsHandler, attributes);
}
@Override
protected byte[] getPrelude(ServerHttpRequest request) {
return PRELUDE;
}
}
}