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/*
* Copyright 2017 ZTE Corporation.
*
* 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.onap.holmes.dsa.dmaappolling;
import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.onap.holmes.common.api.stat.VesAlarm;
import org.onap.holmes.common.dropwizard.ioc.utils.ServiceLocatorHolder;
import org.onap.holmes.common.exception.CorrelationException;
import org.onap.holmes.common.utils.GsonUtil;
import org.onap.holmes.common.utils.HttpsUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;
@Getter
@Setter
@Slf4j
public class Subscriber {
private DMaaPResponseUtil dMaaPResponseUtil = ServiceLocatorHolder.getLocator()
.getService(DMaaPResponseUtil.class);
/**
* The number of milliseconds to wait for messages if none are immediately available. This
* should normally be used, and set at 15000 or higher.
*/
private int timeout = 15000;
/**
* The maximum number of messages to return
*/
private int limit = 100;
/**
* The number of milliseconds to poll interval time. This should normally be used, and set at
* 15000 or higher.
*/
private int period = timeout;
private boolean secure;
private String topic;
private String url;
private String uuid = UUID.randomUUID() + "";
private String consumerGroup = "homlesGroup" + uuid;
private String consumer = "homles" + uuid;
private String authInfo;
private String authExpDate;
public List<VesAlarm> subscribe() throws CorrelationException {
List<String> response;
try {
response = getDMaaPData();
} catch (Exception e) {
throw new CorrelationException("Failed to get data from DMaaP.", e);
}
try {
return extractVesAlarm(response);
} catch (Exception e) {
throw new CorrelationException("Failed to convert the response data to VES alarms.", e);
}
}
private List<String> getDMaaPData() throws Exception {
String response;
CloseableHttpClient closeableHttpClient = null;
HttpGet httpGet = new HttpGet(url + "/" + consumerGroup + "/" + consumer + "?timeout=" + period);
try {
closeableHttpClient = HttpsUtils.getHttpClient(timeout);
HttpResponse httpResponse = HttpsUtils
.get(httpGet, new HashMap<>(), closeableHttpClient);
response = HttpsUtils.extractResponseEntity(httpResponse);
} catch (Exception e) {
throw e;
} finally {
httpGet.releaseConnection();
if (closeableHttpClient != null) {
try {
closeableHttpClient.close();
} catch (IOException e) {
log.warn("Failed to close http client!");
}
}
}
return GsonUtil.jsonToBean(response, List.class);
}
private List<VesAlarm> extractVesAlarm(List<String> responseEntity) throws IOException {
List<VesAlarm> vesAlarmList = new ArrayList<>();
for (String entity : responseEntity) {
vesAlarmList.add(dMaaPResponseUtil.convertJsonToVesAlarm(entity));
}
return vesAlarmList;
}
}
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