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package org.onap.so.db.connections;
import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Set;
import javax.management.JMX;
import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import org.onap.logging.filter.base.ErrorCode;
import org.onap.logging.filter.base.ScheduledLogging;
import org.onap.logging.filter.base.ScheduledTaskException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Profile;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import com.zaxxer.hikari.HikariPoolMXBean;
@Component
@Profile("!test")
public class ScheduledDnsLookup {
private static final String JMX_HIKARI_DB_POOL_LOOKUP = "com.zaxxer.hikari:type=Pool (*,*";
private static final String DB_HOST = "DB_HOST";
@Autowired
private DbDnsIpAddress dnsIpAddress;
private static Logger logger = LoggerFactory.getLogger(ScheduledDnsLookup.class);
@ScheduledLogging
@Scheduled(fixedRate = 15000)
public void performDnsLookup() throws ScheduledTaskException {
String dnsUrl = System.getenv(DB_HOST);
try {
if (dnsUrl == null) {
throw new ScheduledTaskException(ErrorCode.DataError,
"Database DNS is not provided. Please verify the configuration");
}
InetAddress inetAddress = java.net.InetAddress.getByName(dnsUrl);
String ipAddress = inetAddress.getHostAddress();
String currentIpAddress = dnsIpAddress.getIpAddress();
/* This is in initial state */
if (currentIpAddress == null) {
dnsIpAddress.setIpAddress(ipAddress);
return;
}
if ((ipAddress != null) && (!ipAddress.equalsIgnoreCase(currentIpAddress))) {
logger.debug("Switched Database IP Address from {} to {}", currentIpAddress, ipAddress);
softEvictConnectionPool();
dnsIpAddress.setIpAddress(ipAddress);
}
} catch (UnknownHostException e) {
logger.warn("Database DNS %s is not resolvable to an IP Address", dnsUrl);
}
}
private void softEvictConnectionPool() {
try {
MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
ObjectName queryObj = new ObjectName(JMX_HIKARI_DB_POOL_LOOKUP);
Set<ObjectInstance> objects = mBeanServer.queryMBeans(queryObj, null);
for (ObjectInstance objectInstance : objects) {
ObjectName poolObject = objectInstance.getObjectName();
HikariPoolMXBean poolProxy = JMX.newMXBeanProxy(mBeanServer, poolObject, HikariPoolMXBean.class);
logger.debug("database connection pool is soft evicted for connections");
poolProxy.softEvictConnections();
}
} catch (Exception e) {
logger.warn("Error encountered in evicting DB connection pool", e);
}
}
}
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