private boolean isMasterAddressChanged(ConnectionInfo currentMasterConnectionInfo) {
if (previousMasterConnectionInfo == null) {
return true;
}
return !previousMasterConnectionInfo
.getHostAndPort()
.equals(currentMasterConnectionInfo.getHostAndPort());
}
public JedisPool(ConnectionInfo connectionInfo, JedisPoolConfig config) {
this.hostAndPort = connectionInfo.getHostAndPort();
JedisFactory factory =
new JedisFactory(
connectionInfo.getHost(),
connectionInfo.getPort(),
connectionInfo.getTimeout(),
connectionInfo.getPassword(),
connectionInfo.getDatabase(),
connectionInfo.getClientName());
internalPool = new GenericObjectPool(factory, config);
}
@Override
public void onMessage(String channel, String message) {
// message example: +switch-master: mymaster 127.0.0.1 6379 127.0.0.1 6380
// +redirect-to-master mymaster 127.0.0.1 6380 127.0.0.1 6381 (if slave-master fail-over
// quick enough)
logger.info("Sentinel " + sentinelInfo.getHostAndPort() + " published: " + message);
String[] switchMasterMsg = message.split(" ");
// if the switeched master name equals my master name, destroy the old pool and init a new
// pool
if (masterName.equals(switchMasterMsg[0])) {
destroyInternalPool();
ConnectionInfo masterConnectionInfo =
buildMasterConnectionInfo(switchMasterMsg[3], switchMasterMsg[4]);
logger.info("Switch master to " + masterConnectionInfo.getHostAndPort());
initInternalPool(masterConnectionInfo);
previousMasterConnectionInfo = masterConnectionInfo;
}
}
@Override
public void run() {
while (running.get()) {
try {
boolean avalibleSentinelExist = selectSentinel();
if (avalibleSentinelExist) {
try {
ConnectionInfo masterConnectionInfo = queryMasterAddress();
if ((internalPool != null) && isMasterAddressChanged(masterConnectionInfo)) {
logger.info(
"The internalPool {} had changed, destroy it now.",
previousMasterConnectionInfo.getHostAndPort());
destroyInternalPool();
}
if ((internalPool == null) || isMasterAddressChanged(masterConnectionInfo)) {
logger.info(
"The internalPool {} is not init or the address had changed, init it now.",
masterConnectionInfo.getHostAndPort());
initInternalPool(masterConnectionInfo);
}
previousMasterConnectionInfo = masterConnectionInfo;
// blocking listen master switch message until exception happen.
subscriber = new MasterSwitchSubscriber();
sentinelJedis.subscribe(subscriber, "+switch-master", "+redirect-to-master");
} catch (JedisConnectionException e) {
JedisUtils.closeJedis(sentinelJedis);
if (running.get()) {
logger.error(
"Lost connection with Sentinel "
+ sentinelInfo.getHostAndPort()
+ ", sleep 1000ms and try to connect another one.");
sleep(RETRY_WAIT_TIME_MILLS);
}
} catch (Exception e) {
JedisUtils.closeJedis(sentinelJedis);
if (running.get()) {
logger.error(
"Unexpected Exception happen, current Sentinel is"
+ sentinelInfo.getHostAndPort()
+ ", sleep 1000ms and try again.",
e);
sleep(RETRY_WAIT_TIME_MILLS);
}
}
} else {
logger.info("All sentinels down, sleep 1000ms and try to select again.");
// when the system startup but the sentinels not yet, init an ugly address to prevent
// null point
// exception.
if (internalPool == null) {
ConnectionInfo masterConnectionInfo = new ConnectionInfo(UNAVAILABLE_MASTER_ADDRESS);
initInternalPool(masterConnectionInfo);
previousMasterConnectionInfo = masterConnectionInfo;
}
sleep(RETRY_WAIT_TIME_MILLS);
}
} catch (Exception e) {
logger.error("Unexpected exception happen", e);
sleep(RETRY_WAIT_TIME_MILLS);
}
}
}