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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2018 Nokia.
* ================================================================================
* 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.so.bpmn.infrastructure.pnf.dmaap;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import javax.ws.rs.core.UriBuilder;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
@Component
public class PnfEventReadyDmaapClient implements DmaapClient {
private static final Logger logger = LoggerFactory.getLogger(PnfEventReadyDmaapClient.class);
private HttpClient httpClient;
private Map<String, Runnable> pnfCorrelationIdToThreadMap;
private HttpGet getRequestForpnfReady;
private HttpGet getRequestForPnfUpdate;
private int topicListenerDelayInSeconds;
private volatile ScheduledThreadPoolExecutor executor;
private volatile boolean dmaapThreadListenerIsRunning;
@Autowired
public PnfEventReadyDmaapClient(Environment env) {
httpClient = HttpClientBuilder.create().build();
pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
topicListenerDelayInSeconds = env.getProperty("pnf.dmaap.topicListenerDelayInSeconds", Integer.class);
executor = null;
getRequestForpnfReady = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
.scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
.port(env.getProperty("pnf.dmaap.port", Integer.class))
.path(env.getProperty("pnf.dmaap.pnfReadyTopicName")).path(env.getProperty("pnf.dmaap.consumerGroup"))
.path(env.getProperty("pnf.dmaap.consumerId")).build());
getRequestForPnfUpdate = new HttpGet(UriBuilder.fromUri(env.getProperty("pnf.dmaap.uriPathPrefix"))
.scheme(env.getProperty("pnf.dmaap.protocol")).host(env.getProperty("pnf.dmaap.host"))
.port(env.getProperty("pnf.dmaap.port", Integer.class))
.path(env.getProperty("pnf.dmaap.pnfUpdateTopicName")).path(env.getProperty("pnf.dmaap.consumerGroup"))
.path(env.getProperty("pnf.dmaap.consumerIdUpdate")).build());
}
@Override
public synchronized void registerForUpdate(String pnfCorrelationId, Runnable informConsumer) {
logger.debug("registering for pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
pnfCorrelationIdToThreadMap.put(pnfCorrelationId, informConsumer);
if (!dmaapThreadListenerIsRunning) {
startDmaapThreadListener();
}
}
@Override
public synchronized Runnable unregister(String pnfCorrelationId) {
logger.debug("unregistering from pnf ready dmaap event for pnf correlation id: {}", pnfCorrelationId);
Runnable runnable = pnfCorrelationIdToThreadMap.remove(pnfCorrelationId);
if (pnfCorrelationIdToThreadMap.isEmpty()) {
stopDmaapThreadListener();
}
return runnable;
}
private synchronized void startDmaapThreadListener() {
if (!dmaapThreadListenerIsRunning) {
executor = new ScheduledThreadPoolExecutor(1);
executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
executor.scheduleWithFixedDelay(new DmaapTopicListenerThread(), 0, topicListenerDelayInSeconds,
TimeUnit.SECONDS);
dmaapThreadListenerIsRunning = true;
}
}
private synchronized void stopDmaapThreadListener() {
if (dmaapThreadListenerIsRunning) {
executor.shutdown();
dmaapThreadListenerIsRunning = false;
executor = null;
}
}
class DmaapTopicListenerThread implements Runnable {
@Override
public void run() {
try {
HttpResponse response;
response = httpClient.execute(getRequestForPnfUpdate);
List<String> pnfUpdateResponse = getPnfCorrelationIdListFromResponse(response);
if (pnfUpdateResponse.isEmpty()) {
response = httpClient.execute(getRequestForpnfReady);
getPnfCorrelationIdListFromResponse(response)
.forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
} else {
pnfUpdateResponse.forEach(this::informAboutPnfReadyIfPnfCorrelationIdFound);
}
} catch (IOException e) {
logger.error("Exception caught during sending rest request to dmaap for listening event topic", e);
} finally {
getRequestForpnfReady.reset();
getRequestForPnfUpdate.reset();
}
}
private List<String> getPnfCorrelationIdListFromResponse(HttpResponse response) throws IOException {
if (response.getStatusLine().getStatusCode() == 200) {
String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
if (responseString != null) {
return JsonUtilForPnfCorrelationId.parseJsonToGelAllPnfCorrelationId(responseString);
}
}
return Collections.emptyList();
}
private void informAboutPnfReadyIfPnfCorrelationIdFound(String pnfCorrelationId) {
Runnable runnable = unregister(pnfCorrelationId);
if (runnable != null) {
logger.debug("dmaap listener gets pnf ready event for pnfCorrelationId: {}", pnfCorrelationId);
runnable.run();
}
}
}
}
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