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/*-
* ================================================================================
* ECOMP Portal SDK
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property
* ================================================================================
* 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.openecomp.portalsdk.core.onboarding.ueb;
import java.io.IOException;
import java.net.MalformedURLException;
import java.security.GeneralSecurityException;
import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openecomp.portalsdk.core.onboarding.util.PortalApiConstants;
import com.att.nsa.cambria.client.CambriaBatchingPublisher;
import com.att.nsa.cambria.client.CambriaClientBuilders;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
/**
* Provides a publisher that sends messages to a UEB topic.
*
* Utilizes AT&T's UEB/Cambria subscriber/publisher messaging service.
*/
public class Publisher {
private final Log logger = LogFactory.getLog(getClass());
protected final LinkedList<String> urlList = Helper.uebUrlList();
private final String topicName;
private final String publisherKey;
private final String publisherSecret;
/**
* Accepts coordinates needed to publish to a UEB topic.
*
* @param publisherKey
* UEB key used to publish to the topic
* @param publisherSecret
* UEB secret used to publish to the topic
* @param topicName
* UEB topic name
*/
public Publisher(String publisherKey, String publisherSecret, String topicName) {
this.publisherKey = publisherKey;
this.publisherSecret = publisherSecret;
this.topicName = topicName;
logger.info("Publisher instantiated for topic " + topicName);
}
/**
* Creates a publisher, subscribes to the topic, sends the specified message
* to the topic, then closes the publisher. This ensures that the single
* message goes immediately. UEB is designed for high throughput and tries
* to batch up multiple messages in each send, but this method wants the
* single message to go immediately.
*
* @param uebMsg
* Message object to send as the payload.
* @throws UebException
* If anything goes wrong, including JSON serialization of the
* specified message object.
*/
public void send(UebMsg uebMsg) throws UebException {
String msg = null;
CambriaBatchingPublisher pub;
try {
pub = new CambriaClientBuilders.PublisherBuilder()
.authenticatedBy(publisherKey, publisherSecret).usingHosts(urlList).onTopic(topicName).build();
} catch (MalformedURLException e1) {
logger.error("pub.build Exception ", e1);
throw new UebException(PortalApiConstants.ECOMP_UEB_UNKNOWN_PUBLISH_ERROR, e1, topicName, null, msg);
} catch (GeneralSecurityException e1) {
logger.error("pub.build Exception ", e1);
throw new UebException(PortalApiConstants.ECOMP_UEB_UNKNOWN_PUBLISH_ERROR, e1, topicName, null, msg);
}
try {
ObjectWriter mapper = new ObjectMapper().writer().withDefaultPrettyPrinter();
msg = mapper.writeValueAsString(uebMsg);
} catch (JsonProcessingException e) {
throw new UebException(PortalApiConstants.ECOMP_UEB_INVALID_MSG, topicName, null, null);
}
try {
logger.debug("Publishing to " + topicName + " msg: " + msg);
int NumSent = pub.send(PortalApiConstants.ECOMP_GENERAL_UEB_PARTITION, msg);
if (NumSent == 0) {
throw new UebException(PortalApiConstants.ECOMP_UEB_UNKNOWN_PUBLISH_ERROR, topicName, null, msg);
}
} catch (IOException ex) {
logger.error("Failed to publish", ex);
throw new UebException(PortalApiConstants.ECOMP_UEB_UNKNOWN_PUBLISH_ERROR, ex, topicName, null, msg);
}
try {
// close the publisher to make sure everything's sent before exiting
pub.close(5, TimeUnit.SECONDS);
} catch (Exception ex) {
logger.error("pub.close Exception ", ex);
throw new UebException(PortalApiConstants.ECOMP_UEB_UNKNOWN_PUBLISH_ERROR, ex, topicName, null, msg);
}
}
}
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