package redis.clients.jedis;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Logger;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import redis.clients.jedis.exceptions.JedisConnectionException;
import redis.clients.jedis.exceptions.JedisException;
import redis.clients.util.Pool;
public class JedisSentinelPool extends Pool<Jedis> {
protected GenericObjectPoolConfig poolConfig;
protected int timeout = Protocol.DEFAULT_TIMEOUT;
protected String password;
protected int database = Protocol.DEFAULT_DATABASE;
protected Set<MasterListener> masterListeners = new HashSet<MasterListener>();
protected Logger log = Logger.getLogger(getClass().getName());
public JedisSentinelPool(String masterName, Set<String> sentinels,
final GenericObjectPoolConfig poolConfig) {
this(masterName, sentinels, poolConfig, Protocol.DEFAULT_TIMEOUT, null,
Protocol.DEFAULT_DATABASE);
}
public JedisSentinelPool(String masterName, Set<String> sentinels) {
this(masterName, sentinels, new GenericObjectPoolConfig(),
Protocol.DEFAULT_TIMEOUT, null, Protocol.DEFAULT_DATABASE);
}
public JedisSentinelPool(String masterName, Set<String> sentinels,
String password) {
this(masterName, sentinels, new GenericObjectPoolConfig(),
Protocol.DEFAULT_TIMEOUT, password);
}
public JedisSentinelPool(String masterName, Set<String> sentinels,
final GenericObjectPoolConfig poolConfig, int timeout,
final String password) {
this(masterName, sentinels, poolConfig, timeout, password,
Protocol.DEFAULT_DATABASE);
}
public JedisSentinelPool(String masterName, Set<String> sentinels,
final GenericObjectPoolConfig poolConfig, final int timeout) {
this(masterName, sentinels, poolConfig, timeout, null,
Protocol.DEFAULT_DATABASE);
}
public JedisSentinelPool(String masterName, Set<String> sentinels,
final GenericObjectPoolConfig poolConfig, final String password) {
this(masterName, sentinels, poolConfig, Protocol.DEFAULT_TIMEOUT,
password);
}
public JedisSentinelPool(String masterName, Set<String> sentinels,
final GenericObjectPoolConfig poolConfig, int timeout,
final String password, final int database) {
this.poolConfig = poolConfig;
this.timeout = timeout;
this.password = password;
this.database = database;
HostAndPort master = initSentinels(sentinels, masterName);
initPool(master);
}
private volatile JedisFactory factory;
private volatile HostAndPort currentHostMaster;
public void destroy() {
for (MasterListener m : masterListeners) {
m.shutdown();
}
super.destroy();
}
public HostAndPort getCurrentHostMaster() {
return currentHostMaster;
}
private void initPool(HostAndPort master) {
if (!master.equals(currentHostMaster)) {
currentHostMaster = master;
if (factory == null) {
factory = new JedisFactory(master.getHost(), master.getPort(),
timeout, password, database);
initPool(poolConfig, factory);
} else {
factory.setHostAndPort(currentHostMaster);
// although we clear the pool, we still have to check the
// returned object
// in getResource, this call only clears idle instances, not
// borrowed instances
internalPool.clear();
}
log.info("Created JedisPool to master at " + master);
}
}
private HostAndPort initSentinels(Set<String> sentinels,
final String masterName) {
HostAndPort master = null;
boolean sentinelAvailable = false;
log.info("Trying to find master from available Sentinels...");
for (String sentinel : sentinels) {
final HostAndPort hap = toHostAndPort(Arrays.asList(sentinel
.split(":")));
log.fine("Connecting to Sentinel " + hap);
Jedis jedis = null;
try {
jedis = new Jedis(hap.getHost(), hap.getPort());
List<String> masterAddr = jedis
.sentinelGetMasterAddrByName(masterName);
// connected to sentinel...
sentinelAvailable = true;
if (masterAddr == null || masterAddr.size() != 2) {
log.warning("Can not get master addr, master name: "
+ masterName + ". Sentinel: " + hap + ".");
continue;
}
master = toHostAndPort(masterAddr);
log.fine("Found Redis master at " + master);
break;
} catch (JedisConnectionException e) {
log.warning("Cannot connect to sentinel running @ " + hap
+ ". Trying next one.");
} finally {
if (jedis != null) {
jedis.close();
}
}
}
if (master == null) {
if (sentinelAvailable) {
// can connect to sentinel, but master name seems to not
// monitored
throw new JedisException("Can connect to sentinel, but "
+ masterName + " seems to be not monitored...");
} else {
throw new JedisConnectionException(
"All sentinels down, cannot determine where is "
+ masterName + " master is running...");
}
}
log.info("Redis master running at " + master
+ ", starting Sentinel listeners...");
for (String sentinel : sentinels) {
final HostAndPort hap = toHostAndPort(Arrays.asList(sentinel
.split(":")));
MasterListener masterListener = new MasterListener(masterName,
hap.getHost(), hap.getPort());
masterListeners.add(masterListener);
masterListener.start();
}
return master;
}
private HostAndPort toHostAndPort(List<String> getMasterAddrByNameResult) {
String host = getMasterAddrByNameResult.get(0);
int port = Integer.parseInt(getMasterAddrByNameResult.get(1));
return new HostAndPort(host, port);
}
@Override
public Jedis getResource() {
while (true) {
Jedis jedis = super.getResource();
jedis.setDataSource(this);
// get a reference because it can change concurrently
final HostAndPort master = currentHostMaster;
final HostAndPort connection = new HostAndPort(jedis.getClient()
.getHost(), jedis.getClient().getPort());
if (master.equals(connection)) {
// connected to the correct master
return jedis;
} else {
returnBrokenResource(jedis);
}
}
}
public void returnBrokenResource(final Jedis resource) {
if (resource != null) {
returnBrokenResourceObject(resource);
}
}
public void returnResource(final Jedis resource) {
if (resource != null) {
resource.resetState();
returnResourceObject(resource);
}
}
protected class JedisPubSubAdapter extends JedisPubSub {
@Override
public void onMessage(String channel, String message) {
}
@Override
public void onPMessage(String pattern, String channel, String message) {
}
@Override
public void onPSubscribe(String pattern, int subscribedChannels) {
}
@Override
public void onPUnsubscribe(String pattern, int subscribedChannels) {
}
@Override
public void onSubscribe(String channel, int subscribedChannels) {
}
@Override
public void onUnsubscribe(String channel, int subscribedChannels) {
}
}
protected class MasterListener extends Thread {
protected String masterName;
protected String host;
protected int port;
protected long subscribeRetryWaitTimeMillis = 5000;
protected Jedis j;
protected AtomicBoolean running = new AtomicBoolean(false);
protected MasterListener() {
}
public MasterListener(String masterName, String host, int port) {
this.masterName = masterName;
this.host = host;
this.port = port;
}
public MasterListener(String masterName, String host, int port,
long subscribeRetryWaitTimeMillis) {
this(masterName, host, port);
this.subscribeRetryWaitTimeMillis = subscribeRetryWaitTimeMillis;
}
public void run() {
running.set(true);
while (running.get()) {
j = new Jedis(host, port);
try {
j.subscribe(new JedisPubSubAdapter() {
@Override
public void onMessage(String channel, String message) {
log.fine("Sentinel " + host + ":" + port
+ " published: " + message + ".");
String[] switchMasterMsg = message.split(" ");
if (switchMasterMsg.length > 3) {
if (masterName.equals(switchMasterMsg[0])) {
initPool(toHostAndPort(Arrays.asList(
switchMasterMsg[3],
switchMasterMsg[4])));
} else {
log.fine("Ignoring message on +switch-master for master name "
+ switchMasterMsg[0]
+ ", our master name is "
+ masterName);
}
} else {
log.severe("Invalid message received on Sentinel "
+ host
+ ":"
+ port
+ " on channel +switch-master: "
+ message);
}
}
}, "+switch-master");
} catch (JedisConnectionException e) {
if (running.get()) {
log.severe("Lost connection to Sentinel at " + host
+ ":" + port
+ ". Sleeping 5000ms and retrying.");
try {
Thread.sleep(subscribeRetryWaitTimeMillis);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
} else {
log.fine("Unsubscribing from Sentinel at " + host + ":"
+ port);
}
}
}
}
public void shutdown() {
try {
log.fine("Shutting down listener on " + host + ":" + port);
running.set(false);
// This isn't good, the Jedis object is not thread safe
j.disconnect();
} catch (Exception e) {
log.severe("Caught exception while shutting down: "
+ e.getMessage());
}
}
}
}