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/*
* ============LICENSE_START========================================================================
* ONAP : ccsdk feature sdnr wt mountpoint-registrar
* =================================================================================================
* Copyright (C) 2019 highstreet technologies GmbH 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.onap.ccsdk.features.sdnr.wt.mountpointregistrar.impl;
import java.util.Properties;
import org.onap.dmaap.mr.client.MRClientFactory;
import org.onap.dmaap.mr.client.MRConsumer;
import org.onap.dmaap.mr.client.response.MRConsumerResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class DMaaPVESMsgConsumerImpl implements DMaaPVESMsgConsumer {
private static final Logger LOG = LoggerFactory.getLogger(DMaaPVESMsgConsumerImpl.class);
private final String name = this.getClass().getSimpleName();
private Properties properties = null;
private MRConsumer consumer = null;
private boolean running = false;
private boolean ready = false;
private int fetchPause = 5000; // Default pause between fetch - 5 seconds
private int timeout = 15000; // Default timeout - 15 seconds
protected DMaaPVESMsgConsumerImpl() {
}
/*
* Thread to fetch messages from the DMaaP topic. Waits for the messages to arrive on the topic until a certain timeout and returns.
* If no data arrives on the topic, sleeps for a certain time period before checking again
*/
@Override
public void run() {
if (ready) {
running = true;
while (running) {
try {
boolean noData = true;
MRConsumerResponse consumerResponse = null;
consumerResponse = consumer.fetchWithReturnConsumerResponse(timeout, -1);
for (String msg : consumerResponse.getActualMessages()) {
noData = false;
LOG.debug("{} received ActualMessage from DMaaP VES Message topic {}", name,msg);
processMsg(msg);
}
if (noData) {
LOG.debug("{} received ResponseCode: {}", name, consumerResponse.getResponseCode());
LOG.debug("{} received ResponseMessage: {}", name, consumerResponse.getResponseMessage());
if ((consumerResponse.getResponseCode() == null)
&& (consumerResponse.getResponseMessage().contains("SocketTimeoutException"))) {
LOG.warn("Client timeout while waiting for response from Server {}",
consumerResponse.getResponseMessage());
}
pauseThread();
}
} catch (Exception e) {
LOG.error("Caught exception reading from DMaaP VES Message Topic", e);
running = false;
}
}
}
}
/*
* Create a consumer by specifying properties containing information such as topic name, timeout, URL etc
*/
@Override
public void init(Properties properties) {
try {
String timeoutStr = properties.getProperty("timeout");
LOG.debug("timeoutStr: {}", timeoutStr);
if ((timeoutStr != null) && (timeoutStr.length() > 0)) {
timeout = parseTimeOutValue(timeoutStr);
}
String fetchPauseStr = properties.getProperty("fetchPause");
LOG.debug("fetchPause(Str): {}",fetchPauseStr);
if ((fetchPauseStr != null) && (fetchPauseStr.length() > 0)) {
fetchPause = parseFetchPause(fetchPauseStr);
}
LOG.debug("fetchPause: {} ",fetchPause);
this.consumer = MRClientFactory.createConsumer(properties);
ready = true;
} catch (Exception e) {
LOG.error("Error initializing DMaaP VES Message consumer from file {} {}",properties, e);
}
}
private int parseTimeOutValue(String timeoutStr) {
try {
return Integer.parseInt(timeoutStr);
} catch (NumberFormatException e) {
LOG.error("Non-numeric value specified for timeout ({})",timeoutStr);
}
return timeout;
}
private int parseFetchPause(String fetchPauseStr) {
try {
return Integer.parseInt(fetchPauseStr);
} catch (NumberFormatException e) {
LOG.error("Non-numeric value specified for fetchPause ({})",fetchPauseStr);
}
return fetchPause;
}
private void pauseThread() throws InterruptedException {
if (fetchPause > 0) {
LOG.debug("No data received from fetch. Pausing {} ms before retry", fetchPause);
Thread.sleep(fetchPause);
} else {
LOG.debug("No data received from fetch. No fetch pause specified - retrying immediately");
}
}
@Override
public boolean isReady() {
return ready;
}
@Override
public boolean isRunning() {
return running;
}
public String getProperty(String name) {
return properties.getProperty(name, "");
}
@Override
public void stopConsumer() {
running = false;
}
/*@Override
public abstract void processMsg(String msg) throws Exception;*/
}
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