package org.infinispan.server.websocket;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import org.infinispan.Cache;
import org.infinispan.server.websocket.json.JsonConversionException;
import org.infinispan.server.websocket.json.JsonObject;
import org.infinispan.server.websocket.logging.Log;
import org.infinispan.util.logging.LogFactory;
import java.lang.invoke.MethodHandles;
/**
* Channel Utilities.
*
* @author <a href="mailto:tom.fennelly@gmail.com">tom.fennelly@gmail.com</a>
*/
public class ChannelUtils {
private static final Log logger = LogFactory.getLog(MethodHandles.lookup().lookupClass(), Log.class);
/**
* 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..
*/
public static void pushCacheValue(String key, Cache<Object, Object> cache, ChannelHandlerContext ctx) {
Object value = cache.get(key);
JsonObject responseObject = toJSON(key, value, cache.getName());
// Write the JSON response out onto the channel...
ctx.channel().writeAndFlush(new TextWebSocketFrame(responseObject.toString()));
}
/**
* Cache key, value and cache-name to JSON string.
* <p>
* Note that value objects (like String, Numbers, Characters) are not being converted.
* </p>
*
* @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 java.lang.IllegalStateException In case of complex object which can not be converted to JSON.
*/
public static JsonObject toJSON(String key, Object value, String cacheName) {
JsonObject jsonObject = JsonObject.createNew();
jsonObject.put(OpHandler.CACHE_NAME, cacheName);
jsonObject.put(OpHandler.KEY, key);
if (value != null) {
if (needsJsonConversion(value)) {
JsonObject valueObject = getJsonObject(value);
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, null);
}
return jsonObject;
}
private static JsonObject getJsonObject(Object value) {
JsonObject valueObject;
try {
valueObject = JsonObject.fromObject(value);
} catch (JsonConversionException e) {
throw logger.unableToGetFieldsFromObject(e);
}
return valueObject;
}
private static boolean needsJsonConversion(Object value) {
if (value instanceof String)
return false;
if (value instanceof Number)
return false;
if (value instanceof Character)
return false;
return true;
}
}