com.ibm.etcd.client.utils

Class EtcdLeaderElection

java.lang.Object

com.ibm.etcd.client.utils.EtcdLeaderElection

All Implemented Interfaces:

AutoCloseable

public class EtcdLeaderElection
extends Object
implements AutoCloseable

Etcd-based leader election pattern

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	EtcdLeaderElection.ElectionListener

Field Summary

Fields

Modifier and Type	Field and Description
protected com.google.protobuf.ByteString	bytesPrefix
protected RangeCache	candidates
protected String	id
protected boolean	initialized
protected boolean	leader
protected String	leaderId
protected List<EtcdLeaderElection.ElectionListener>	listeners
protected static org.slf4j.Logger	logger
protected PersistentLeaseKey	ourCandidate
protected int	prefixLen

Constructor Summary

Constructors

Constructor and Description
EtcdLeaderElection(EtcdClient client, com.google.protobuf.ByteString prefix) Observer-only mode, won't participate in election, leaders have no effect
EtcdLeaderElection(EtcdClient client, com.google.protobuf.ByteString prefix, String candidateId)

Method Summary

Modifier and Type	Method and Description
void	addListener(EtcdLeaderElection.ElectionListener listener)
protected com.google.protobuf.ByteString	cacheKey(String str)
protected static String	candId(KeyValue kv)
void	close()
String	getId()
String	getLeaderId()
boolean	isLeader()
protected void	notifyListeners(boolean isLeader)
boolean	removeListener(EtcdLeaderElection.ElectionListener listener)
void	start()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected static final org.slf4j.Logger logger

bytesPrefix

protected final com.google.protobuf.ByteString bytesPrefix

prefixLen

protected final int prefixLen

id

protected final String id

candidates

protected final RangeCache candidates

ourCandidate

protected final PersistentLeaseKey ourCandidate

listeners

protected final List<EtcdLeaderElection.ElectionListener> listeners

leaderId

protected volatile String leaderId

leader

protected volatile boolean leader

initialized

protected boolean initialized

Constructor Detail

EtcdLeaderElection

public EtcdLeaderElection(EtcdClient client,
                          com.google.protobuf.ByteString prefix)

Observer-only mode, won't participate in election, leaders have no effect

EtcdLeaderElection

public EtcdLeaderElection(EtcdClient client,
                          com.google.protobuf.ByteString prefix,
                          String candidateId)

Method Detail

getId

public String getId()

getLeaderId

public String getLeaderId()

isLeader

public boolean isLeader()

addListener

public void addListener(EtcdLeaderElection.ElectionListener listener)

removeListener

public boolean removeListener(EtcdLeaderElection.ElectionListener listener)

notifyListeners

protected void notifyListeners(boolean isLeader)

start

public void start()

close

public void close()

Specified by:

close in interface AutoCloseable

cacheKey

protected com.google.protobuf.ByteString cacheKey(String str)

candId

protected static String candId(KeyValue kv)