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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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
import org.onap.universalvesadapter.configs.DMaapMrUrlConfiguration;
import org.onap.universalvesadapter.exception.DMaapException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.att.nsa.mr.client.MRBatchingPublisher;
import com.att.nsa.mr.client.MRClientFactory;
import com.att.nsa.mr.client.MRConsumer;
import com.att.nsa.mr.client.MRPublisher.message;
/**
*
* This service will handle all the communication with the DMaap MR API
*
*
* @author kmalbari
*
*/
@Component
public class DMaapService {
private final Logger eLOGGER = LoggerFactory.getLogger(this.getClass());
@Autowired
private DMaapMrUrlConfiguration dmaapMrUrlObject;
private MRConsumer consumer;
private MRBatchingPublisher publisher;
private List<String> outgoingMessageQueue = new CopyOnWriteArrayList<>();
/**
* Adds message to outgoing queue that will be sent to DMaaP topic.
*
* @param message outbound message in VES format
*/
public void addMessageInOutgoingQueue(String message) {
if (null != message && !"".equals(message)) {
outgoingMessageQueue.add(message);
eLOGGER.debug("Added message to outgoing queue " + message);
}
}
/**
* reads the messages on DMaap MR Topic
*
* @return iterable of messages that will be received on DMaap MR Topic
*
* @throws DMaapException
*/
public Iterable<String> consumeFromDMaap() throws DMaapException{
if(null == consumer){
try {
consumer = MRClientFactory.createConsumer (dmaapMrUrlObject.getConsumerProperties());
eLOGGER.debug("Created consumer");
} catch (IOException exception) {
throw new DMaapException("Problem creating consumer \nReason : " + exception.getMessage(), exception);
}
}
try {
eLOGGER.debug("Returning result fetched by consumer");
return consumer.fetch();
} catch (Exception exception) {
throw new DMaapException("Problem while fetching messaged from consumer \nReason : " + exception.getMessage(), exception);
}
// return () -> Collections.emptyIterator();
}
/**
* sends the messages to DMaap MR Topic
*
*
* @throws DMaapException
*/
public void publishToDMaap() throws DMaapException{
if(null == publisher){
try {
publisher = MRClientFactory.createBatchingPublisher (dmaapMrUrlObject.getPublisherProperties());
eLOGGER.debug("Create a publisher now.");
} catch (IOException exception) {
throw new DMaapException("Problem creating publisher \nReason : " + exception.getMessage(), exception);
}
}
for(String message : outgoingMessageQueue){
try {
publisher.send(message);
eLOGGER.debug("Sending message to DMaaP :-> " + message );
} catch (IOException exception) {
throw new DMaapException("Problem sending message to DMaaP topic \nReason : " + exception.getMessage(), exception);
}
}
List<message> stuck = null;
try {
stuck = publisher.close ( 20, TimeUnit.SECONDS );
} catch (IOException | InterruptedException exception) {
throw new DMaapException("Problem while closing publisher \nReason : " + exception.getMessage(), exception);
}
if (null != stuck) {
if (stuck.size() > 0) {
eLOGGER.debug(stuck.size() + " messages unsent");
} else {
eLOGGER.debug("Clean exit; all messages sent.");
}
}
else
throw new DMaapException("Problem while closing publisher, no messages were returned. ");
}
/**
* sends the messages to DMaap MR Topic
*
*
* @throws DMaapException
*/
public void publishToDMaap(String outgoingMessage) throws DMaapException{
if(null == publisher){
synchronized(publisher){
if(null == publisher){
try {
publisher = MRClientFactory.createBatchingPublisher (dmaapMrUrlObject.getPublisherProperties());
eLOGGER.debug("Publisher created now.");
} catch (IOException exception) {
throw new DMaapException("Problem creating publisher \nReason : " + exception.getMessage(), exception);
}
}
}
}
try {
publisher.send(outgoingMessage);
eLOGGER.debug("Sent outgoing message " + outgoingMessage);
} catch (IOException exception) {
throw new DMaapException("Problem sending message to DMaaP topic \nReason : " + exception.getMessage(), exception);
}
List<message> stuck = null;
try {
stuck = publisher.close ( 20, TimeUnit.SECONDS );
} catch (IOException | InterruptedException exception) {
throw new DMaapException("Problem while closing publisher \nReason : " + exception.getMessage(), exception);
}
if (null != stuck) {
if (stuck.size() > 0) {
eLOGGER.debug(stuck.size() + " messages unsent");
} else {
eLOGGER.debug("Clean exit; all messages sent.");
}
} else{
throw new DMaapException("Problem while closing publisher, no messages were returned. ");
}
}
/**
* for local testing only
* @return
* @throws DMaapException
*/
/*public String consume() throws DMaapException {
URL url;
StringBuffer incomingJson = null;
incomingJson = new StringBuffer();
try {
url = new URL(dmaapMrUrlObject.getUrl());
//open the connection to the above URL.
URLConnection urlcon = url.openConnection();
Map<String, List<String>> header = urlcon.getHeaderFields();
//print all the fields along with their value.
for (Map.Entry<String, List<String>> mp : header.entrySet()) {
eLOGGER.debug(mp.getKey() + " : ");
eLOGGER.debug(mp.getValue().toString());
}
eLOGGER.debug("Complete source code of the URL is-");
eLOGGER.debug("---------------------------------");
//get the inputstream of the open connection.
BufferedReader br = new BufferedReader(new InputStreamReader(urlcon.getInputStream()));
String tempString;
//print the source code line by line.
while ((tempString = br.readLine()) != null) {
eLOGGER.debug(tempString);
incomingJson.append(tempString);
}
} catch (MalformedURLException exception) {
throw new DMaapException("Problem consuming from url \nReason : " + exception.getMessage(), exception);
} catch (IOException exception) {
throw new DMaapException("Problem consuming \nReason : " + exception.getMessage(), exception);
}
return incomingJson.toString();
}*/
}
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