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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.plugins.event.carrier.restserver;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The Class RestServerEndpoint is the end point servlet class for handling REST requests and responses to and from
* Apex.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
@Path("/{eventInput}")
@Produces({ MediaType.APPLICATION_JSON })
@Consumes({ MediaType.APPLICATION_JSON })
public class RestServerEndpoint {
// Get a reference to the logger
private static final Logger LOGGER = LoggerFactory.getLogger(RestServerEndpoint.class);
// Statistics on the amount of HTTP messages handled
private static int getMessagesReceived = 0;
private static int postEventMessagesReceived = 0;
private static int putEventMessagesReceived = 0;
// This map is used to hold all the REST server event inputs. This is used to determine which consumer to send input
// events to
private static Map<String, ApexRestServerConsumer> consumerMap =
new LinkedHashMap<>();
// The ID of this event input. This gets injected from the URL.
@PathParam("eventInput")
private String eventInputId = null;
/**
* Register an Apex consumer with the REST server end point.
*
* @param consumerEventInputId The event input ID that indicates this consumer shoud be used
* @param consumer The consumer to register
*/
public static void registerApexRestServerConsumer(final String consumerEventInputId,
final ApexRestServerConsumer consumer) {
consumerMap.put(consumerEventInputId, consumer);
}
/**
* Get statistics on apex REST event handling.
*
* @return the response
*/
@Path("/Status")
@GET
public Response serviceGetStats() {
getMessagesReceived++;
return Response.status(Response.Status.OK.getStatusCode())
.entity("{\n" + "\"INPUTS\": \"" + consumerMap.keySet() + "\",\n" + "\"STAT\": " + getMessagesReceived
+ ",\n" + "\"POST\": " + postEventMessagesReceived + ",\n" + "\"PUT\": "
+ putEventMessagesReceived + "\n}")
.build();
}
/**
* Service post request, an incoming event over RETS to Apex.
*
* @param jsonString the JSON string containing the data coming in on the REST call
* @return the response event to the request
*/
@Path("/EventIn")
@POST
public Response servicePostRequest(final String jsonString) {
postEventMessagesReceived++;
if (LOGGER.isDebugEnabled()) {
String message = "event input " + eventInputId + ", received POST of event \"" + jsonString + "\"";
LOGGER.debug(message);
}
// Common handler method for POST and PUT requests
return handleEvent(jsonString);
}
/**
* Service put request, an incoming event over RETS to Apex.
*
* @param jsonString the JSON string containing the data coming in on the REST call
* @return the response event to the request
*/
@Path("/EventIn")
@PUT
public Response servicePutRequest(final String jsonString) {
putEventMessagesReceived++;
if (LOGGER.isDebugEnabled()) {
String message = "event input \"" + eventInputId + "\", received PUT of event \"" + jsonString + "\"";
LOGGER.debug(message);
}
// Common handler method for POST and PUT requests
return handleEvent(jsonString);
}
/**
* Common event handler for events received on POST and PUT messages.
*
* @param jsonString the JSON string containing the data coming in on the REST call
* @return the response event to the request
*/
private Response handleEvent(final String jsonString) {
// Find the correct consumer for this REST message
final ApexRestServerConsumer eventConsumer = consumerMap.get(eventInputId);
if (eventConsumer == null) {
final String errorMessage =
"event input " + eventInputId + " is not defined in the Apex configuration file";
LOGGER.warn(errorMessage);
return Response.status(Response.Status.BAD_REQUEST.getStatusCode())
.entity("{'errorMessage', '" + errorMessage + "'}").build();
}
return eventConsumer.receiveEvent(jsonString);
}
}
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