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/*-
* ============LICENSE_START=======================================================
* openECOMP : SDN-C
* ================================================================================
* 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.sdnc.dmaapclient;
import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.att.nsa.mr.client.MRClientFactory;
import com.att.nsa.mr.client.MRConsumer;
import com.att.nsa.mr.client.response.MRConsumerResponse;
public abstract class SdncDmaapConsumer implements Runnable {
private static final Logger LOG = LoggerFactory
.getLogger(SdncDmaapConsumer.class);
private String propertiesPath = "";
private Properties properties = null;
MRConsumer consumer = null;
MRConsumerResponse consumerResponse = null;
boolean running = false;
boolean ready = false;
int fetchPause = 5000; // Default pause between fetchs - 5 seconds
public boolean isReady() {
return ready;
}
int timeout = 15000; // Default timeout - 15 seconds
public boolean isRunning() {
return running;
}
public SdncDmaapConsumer() {
}
public SdncDmaapConsumer(Properties properties, String propertiesPath) {
init(properties, propertiesPath);
}
public String getProperty(String name) {
return(properties.getProperty(name, ""));
}
public void init(Properties properties, String propertiesPath) {
this.propertiesPath = propertiesPath;
try {
this.properties = (Properties) properties.clone();
this.properties.load(new FileInputStream(new File(propertiesPath)));
String timeoutStr = properties.getProperty("timeout");
if ((timeoutStr != null) && (timeoutStr.length() > 0)) {
try {
timeout = Integer.parseInt(timeoutStr);
} catch (NumberFormatException e) {
LOG.error("Non-numeric value specified for timeout ("+timeoutStr+")");
}
}
String fetchPauseStr = properties.getProperty("fetchPause");
if ((fetchPauseStr != null) && (fetchPauseStr.length() > 0)) {
try {
fetchPause = Integer.parseInt(fetchPauseStr);
} catch (NumberFormatException e) {
LOG.error("Non-numeric valud specified for fetchPause ("+fetchPauseStr+")");
}
}
this.consumer = MRClientFactory.createConsumer(propertiesPath);
ready = true;
} catch (Exception e) {
LOG.error("Error initializing DMaaP consumer from file "+propertiesPath, e);
}
}
@Override
public void run() {
if (ready) {
running = true;
while (running) {
try {
boolean noData = true;
consumerResponse = consumer.fetchWithReturnConsumerResponse(timeout, -1);
for (String msg : consumerResponse.getActualMessages()) {
noData = false;
LOG.info("Received message from DMaaP:\n"+msg);
processMsg(msg);
}
if (noData) {
if (fetchPause > 0) {
LOG.info("No data received from fetch. Pausing "+fetchPause+" ms before retry");
Thread.sleep(fetchPause);
} else {
LOG.info("No data received from fetch. No fetch pause specified - retrying immediately");
}
}
} catch (Exception e) {
LOG.error("Caught exception reading from DMaaP", e);
running = false;
}
}
}
}
abstract public void processMsg(String msg) throws InvalidMessageException;
}
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