/**
* Cache key, value and cache-name to JSON string.
*
* <p>Note that value objects (like String, Numbers, Characters) are not being converted.
*
* @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;
}
public static void pushErrorMessage(String errorMessage, ChannelHandlerContext ctx) {
JsonObject errorObject = JsonObject.createNew();
errorObject.put(OpHandler.ERROR, errorMessage);
ctx.channel()
.writeAndFlush(new TextWebSocketFrame(errorObject.toString()), ctx.channel().voidPromise());
}