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/*
* ============LICENSE_START=======================================================
* ONAP : DCAE
* ================================================================================
* Copyright 2018 TechMahindra
*=================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.universalvesadapter.service;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import org.onap.universalvesadapter.adapter.UniversalEventAdapter;
import org.onap.universalvesadapter.dmaap.Creator;
import org.onap.universalvesadapter.dmaap.MRPublisher.DMaaPMRPublisher;
import org.onap.universalvesadapter.dmaap.MRSubcriber.DMaaPMRSubscriber;
import org.onap.universalvesadapter.exception.DMaapException;
import org.onap.universalvesadapter.exception.VesException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class DMaapService {
private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
private static List<String> list = new LinkedList<String>();
@Autowired
private UniversalEventAdapter eventAdapter;
/**
* It fetches events from DMaap in JSON, transforms JSON to VES format and
* publishes it to outgoing DMaap MR Topic
*
* @param DMaaPMRSubscriber,DMaaPMRPublisher
* @return
*/
public void fetchAndPublishInDMaaP(DMaaPMRSubscriber dMaaPMRSubscriber, DMaaPMRPublisher publisher, Creator creater)
throws InterruptedException {
LOGGER.info("fetch and publish from and to Dmaap started");
while (true) {
synchronized (this) {
for (String incomingJsonString : dMaaPMRSubscriber.fetchMessages().getFetchedMessages()) {
list.add(incomingJsonString);
}
if (list.size() == 0) {
Thread.sleep(2000);
}
LOGGER.debug("number of messages to be converted :{}", list.size());
if (list.size() != 0) {
String val = ((LinkedList<String>) list).removeFirst();
List<String> messages = new ArrayList<>();
String vesEvent = processReceivedJson(val);
if (!(vesEvent.isEmpty() || vesEvent.equals(null) || vesEvent.equals(""))) {
messages.add(vesEvent);
publisher.publish(messages);
LOGGER.info("Message successfully published to DMaaP Topic");
}
}
}
}
}
/**
* It finds mapping file for received json, transforms json to VES format
*
* @param incomingJsonString
* @return
*/
private String processReceivedJson(String incomingJsonString) {
String outgoingJsonString = null;
if (!"".equals(incomingJsonString)) {
try {
/*
* For Future events String eventType =
* adapterService.identifyEventTypeFromIncomingJson(incomingJsonString);
*
* LOGGER.debug("Event identified as " + eventType);
*/
outgoingJsonString = eventAdapter.transform(incomingJsonString, "snmp");
} catch (VesException exception) {
LOGGER.error("Received exception : " + exception.getMessage(), exception);
LOGGER.error("APPLICATION WILL BE SHUTDOWN UNTIL ABOVE ISSUE IS RESOLVED.");
} catch (DMaapException e) {
LOGGER.error("Received exception : ", e.getMessage());
}
}
return outgoingJsonString;
}
}
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