/*
* JBoss, Home of Professional Open Source
* Copyright 2010 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.server.websocket;
import org.infinispan.Cache;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Channel Utilities.
*
* @author <a href="mailto:tom.fennelly@gmail.com">tom.fennelly@gmail.com</a>
*/
public class ChannelUtils {
/**
* Push a cache entry value out onto the websocket channel (to the browser).
* @param key The cache entry key whose value is to be pushed to the browser.
* @param cache The cache containing the key.
* @param ctx The channel context associated with the browser websocket channel..
* @throws JSONException Error generating JSON string.
*/
public static void pushCacheValue(String key, Cache<Object, Object> cache, ChannelHandlerContext ctx) throws JSONException {
Object value = cache.get(key);
JSONObject responseObject = toJSON(key, value, cache.getName());
// Write the JSON response out onto the channel...
ctx.getChannel().write(new TextWebSocketFrame(responseObject.toString()));
}
/**
* Cache key, value and cache-name to JSON string.
* @param key The cache key.
* @param value The cache value.
* @param cacheName The cache name.
* @return JSON Object representing a cache entry payload for transmission to the browser channel.
* @throws JSONException Error generating JSON string.
*/
public static JSONObject toJSON(String key, Object value, String cacheName) throws JSONException {
JSONObject jsonObject = new JSONObject();
jsonObject.put(OpHandler.CACHE_NAME, cacheName);
jsonObject.put(OpHandler.KEY, key);
if(value != null) {
// Encode the cache value as JSON...
JSONObject valueObject = new JSONObject(value);
if(valueObject.get("bytes") == null) {
jsonObject.put(OpHandler.VALUE, valueObject.toString());
jsonObject.put(OpHandler.MIME, "application/json");
} else {
jsonObject.put(OpHandler.VALUE, value);
jsonObject.put(OpHandler.MIME, "text/plain");
}
} else {
jsonObject.put(OpHandler.VALUE, JSONObject.NULL);
}
return jsonObject;
}
}