org.kurento.tree.server.app.RegistrarJsonRpcHandler.java Source code

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Here is the source code for org.kurento.tree.server.app.RegistrarJsonRpcHandler.java

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/*
 * (C) Copyright 2016 Kurento (http://kurento.org/)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package org.kurento.tree.server.app;

import org.kurento.jsonrpc.DefaultJsonRpcHandler;
import org.kurento.jsonrpc.JsonRpcErrorException;
import org.kurento.jsonrpc.Transaction;
import org.kurento.jsonrpc.message.Request;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

public class RegistrarJsonRpcHandler extends DefaultJsonRpcHandler<JsonObject> {

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

    private static final String REGISTER_METHOD = "register";

    private KmsRegistrar registrar;

    public RegistrarJsonRpcHandler(KmsRegistrar registrar) {
        this.registrar = registrar;
    }

    @Override
    public void handleRequest(Transaction transaction, Request<JsonObject> request) throws Exception {

        try {

            if (REGISTER_METHOD.equals(request.getMethod())) {

                String ws = getStringParam(request, "ws");

                log.debug("Registered new kms with wsUri: '" + ws + "'");

                registrar.register(ws);

                transaction.sendVoidResponse();
            } else {
                transaction.sendError(3, "Unknown request with method '" + request.getMethod() + "'", null);
            }

        } catch (Exception e) {
            log.error("Exception processing request " + request, e);
            transaction.sendError(e);
        }
    }

    @SuppressWarnings("unchecked")
    public <T> T getStringParam(Request<JsonObject> request, String paramName) {

        JsonElement paramValue = request.getParams().get(paramName);
        if (paramValue == null) {
            throw new JsonRpcErrorException(1, "Invalid request lacking parameter '" + paramName + "'");
        }

        if (paramValue.isJsonPrimitive()) {
            return (T) paramValue.getAsString();
        }

        throw new JsonRpcErrorException(2,
                "Param '" + paramName + " with value '" + paramValue + "' is not a String");
    }

}