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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.openecomp.mso.client.dmaap;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import org.openecomp.mso.client.dmaap.exceptions.DMaaPConsumerFailure;
import org.openecomp.mso.client.dmaap.exceptions.ExceededMaximumPollingTime;
import org.openecomp.mso.client.dmaap.rest.RestConsumer;
import com.google.common.base.Stopwatch;
public abstract class DmaapConsumer extends DmaapClient {
public DmaapConsumer() throws FileNotFoundException, IOException {
super("dmaap/default-consumer.properties");
}
public Consumer getConsumer() throws FileNotFoundException, IOException {
return new RestConsumer(this.properties);
}
public boolean consume() throws Exception {
Consumer mrConsumer = this.getConsumer();
int iterations = 0;
boolean accepted = false;
Stopwatch stopwatch = Stopwatch.createUnstarted();
try {
while (this.continuePolling()) {
if (stopwatch.elapsed(TimeUnit.MILLISECONDS) >= this.getMaximumElapsedTime()) {
final String message = "exceeded maximum retries on " + this.getRequestId() + " on " + this.getTopic();
auditLogger.error(message);
throw new ExceededMaximumPollingTime(message);
}
stopwatch.start();
Iterable<String> itr = mrConsumer.fetch();
stopwatch.stop();
for (String message : itr) {
if (!accepted && this.isAccepted(message)) {
auditLogger.info("accepted message found for " + this.getRequestId() + " on " + this.getTopic());
accepted = true;
}
if (accepted) {
if (this.isFailure(message)) {
this.stopProcessingMessages();
auditLogger.info("received dmaap message: " + message);
final String errorMsg = "failure received from dmaap topic " + this.getTopic();
auditLogger.error(errorMsg);
throw new DMaaPConsumerFailure(errorMsg);
} else {
auditLogger.info("received dmaap message: " + message);
this.processMessage(message);
}
}
}
iterations++;
}
return true;
} catch (Exception e ) {
throw e;
} finally {
if (stopwatch.isRunning()) {
stopwatch.stop();
}
}
}
/**
* Should this consumer continue to consume messages from the topic?
* @return
*/
public abstract boolean continuePolling();
/**
* Process a message from a DMaaP topic
*
* @param message
* @throws Exception
*/
public abstract void processMessage(String message) throws Exception;
/**
* Has the request been accepted by the receiving system?
* Should the consumer move to processing messages?
*
* @param message
* @return
*/
public abstract boolean isAccepted(String message);
/**
* has the request failed?
*
* @param message
* @return
*/
public abstract boolean isFailure(String message);
/**
* The request id to filter messages on
* @return
*/
public abstract String getRequestId();
/**
* Logic that defines when the consumer should stop processing messages
*/
public abstract void stopProcessingMessages();
/**
* time in milliseconds
*/
public int getMaximumElapsedTime() {
return 180000;
}
}
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