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jsync.io is a non-blocking, event-driven networking framework for Java
There is a newer version: 1.10.13
/*
 * Copyright (c) 2011-2013 The original author or authors
 * ------------------------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *     The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 *
 *     The Apache License v2.0 is available at
 *     http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */

package io.jsync.sockjs.impl;

import io.jsync.Handler;
import io.jsync.buffer.Buffer;
import io.jsync.http.HttpServerRequest;
import io.jsync.http.RouteMatcher;
import io.jsync.impl.AsyncInternal;
import io.jsync.json.JsonObject;
import io.jsync.logging.Logger;
import io.jsync.logging.impl.LoggerFactory;
import io.jsync.sockjs.SockJSSocket;

import java.util.Map;

/**
 * @author Tim Fox
 */
class EventSourceTransport extends BaseTransport {

    private static final Logger log = LoggerFactory.getLogger(EventSourceTransport.class);

    EventSourceTransport(AsyncInternal async, RouteMatcher rm, String basePath, Map sessions, final JsonObject config,
                         final Handler sockHandler) {
        super(async, sessions, config);

        String eventSourceRE = basePath + COMMON_PATH_ELEMENT_RE + "eventsource";

        rm.getWithRegEx(eventSourceRE, new Handler() {
            public void handle(final HttpServerRequest req) {
                if (log.isTraceEnabled()) log.trace("EventSource transport, get: " + req.uri());
                String sessionID = req.params().get("param0");
                Session session = getSession(config.getLong("session_timeout"), config.getLong("heartbeat_period"), sessionID, sockHandler);
                session.setInfo(req.localAddress(), req.remoteAddress(), req.uri(), req.headers());
                session.register(new EventSourceListener(config.getInteger("max_bytes_streaming"), req, session));
            }
        });
    }

    private class EventSourceListener extends BaseListener {

        final int maxBytesStreaming;
        final HttpServerRequest req;
        final Session session;

        boolean headersWritten;
        int bytesSent;
        boolean closed;

        EventSourceListener(int maxBytesStreaming, HttpServerRequest req, Session session) {
            this.maxBytesStreaming = maxBytesStreaming;
            this.req = req;
            this.session = session;
            addCloseHandler(req.response(), session);
        }

        public void sendFrame(String body) {
            if (log.isTraceEnabled()) log.trace("EventSource, sending frame");
            if (!headersWritten) {
                req.response().headers().set("Content-Type", "text/event-stream; charset=UTF-8");
                setNoCacheHeaders(req);
                setJSESSIONID(config, req);
                req.response().setChunked(true);
                req.response().write("\r\n");
                headersWritten = true;
            }
            StringBuilder sb = new StringBuilder();
            sb.append("data: ");
            sb.append(body);
            sb.append("\r\n\r\n");
            Buffer buff = new Buffer(sb.toString());
            req.response().write(buff);
            bytesSent += buff.length();
            if (bytesSent >= maxBytesStreaming) {
                if (log.isTraceEnabled()) log.trace("More than maxBytes sent so closing connection");
                // Reset and close the connection
                close();
            }
        }

        public void close() {
            if (!closed) {
                try {
                    session.resetListener();
                    req.response().end();
                    req.response().close();
                } catch (IllegalStateException e) {
                    // Underlying connection might already be closed - that's fine
                }
                closed = true;
            }
        }

    }
}