Package com.arcadedb.server.ha

Class HAServer

java.lang.Object

com.arcadedb.server.ha.HAServer

All Implemented Interfaces:

ServerPlugin

public class HAServer
extends Object
implements ServerPlugin

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	HAServer.ELECTION_STATUS
static class	HAServer.QUORUM
static class	HAServer.SERVER_ROLE

Field Summary

Fields

Modifier and Type	Field	Description
static String	DEFAULT_PORT
protected Pair<Long,String>	lastElectionVote
protected ReplicationLogFile	replicationLogFile
protected String	replicationPath

Constructor Summary

Constructors

Constructor	Description
HAServer(ArcadeDBServer server, ContextConfiguration configuration)

Method Summary

Modifier and Type	Method	Description
boolean	connectToLeader(String serverEntry, Callable<Void,Exception> errorCallback)
protected ChannelBinaryClient	createNetworkConnection(String host, int port, short commandId)
void	disconnectAllReplicas()
Object	forwardCommandToLeader(HACommand command, long timeout)	Forward a command to the leader server.
String	getClusterName()
int	getConfiguredServers()
HAServer.ELECTION_STATUS	getElectionStatus()
Replica2LeaderNetworkExecutor	getLeader()
String	getLeaderName()
HAMessageFactory	getMessageFactory()
int	getMessagesInQueue()
int	getOnlineReplicas()
int	getOnlineServers()
Leader2ReplicaNetworkExecutor	getReplica(String replicaName)
String	getReplicaServersHTTPAddressesList()
ReplicationLogFile	getReplicationLogFile()
ArcadeDBServer	getServer()
String	getServerAddress()
String	getServerAddressList()
String	getServerName()
JSONObject	getStats()
protected boolean	isCurrentServer(String serverEntry)
boolean	isLeader()
void	printClusterConfiguration()
void	receivedResponse(String remoteServerName, long messageNumber, Object payload)
void	receivedResponseFromForward(long messageNumber, Object result, ErrorResponse error)
void	registerIncomingConnection(String replicaServerName, Leader2ReplicaNetworkExecutor connection)
void	removeServer(String remoteServerName)
void	resendMessagesToReplica(long fromMessageNumber, String replicaName)
void	sendCommandToReplicasNoLog(HACommand command)
List<Object>	sendCommandToReplicasWithQuorum(HACommand command, int quorum, long timeout)
protected void	setElectionStatus(HAServer.ELECTION_STATUS status)
void	setReplicasHTTPAddresses(String replicasHTTPAddresses)
void	setReplicaStatus(String remoteServerName, boolean online)
void	setServerAddresses(String serverAddress)
void	startElection(boolean waitForCompletion)
void	startService()
void	stopService()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.arcadedb.server.ServerPlugin

configure, registerAPI

Field Detail

DEFAULT_PORT

public static final String DEFAULT_PORT

See Also:

Constant Field Values

replicationPath

protected final String replicationPath

replicationLogFile

protected ReplicationLogFile replicationLogFile

lastElectionVote

protected Pair<Long,String> lastElectionVote

Constructor Detail

HAServer

public HAServer(ArcadeDBServer server,
                ContextConfiguration configuration)

Method Detail

startService

public void startService()

Specified by:

startService in interface ServerPlugin

isCurrentServer

protected boolean isCurrentServer(String serverEntry)

stopService

public void stopService()

Specified by:

stopService in interface ServerPlugin

startElection

public void startElection(boolean waitForCompletion)

getReplica

public Leader2ReplicaNetworkExecutor getReplica(String replicaName)

disconnectAllReplicas

public void disconnectAllReplicas()

setReplicaStatus

public void setReplicaStatus(String remoteServerName,
                             boolean online)

receivedResponse

public void receivedResponse(String remoteServerName,
                             long messageNumber,
                             Object payload)

receivedResponseFromForward

public void receivedResponseFromForward(long messageNumber,
                                        Object result,
                                        ErrorResponse error)

getReplicationLogFile

public ReplicationLogFile getReplicationLogFile()

getServer

public ArcadeDBServer getServer()

isLeader

public boolean isLeader()

getLeaderName

public String getLeaderName()

getLeader

public Replica2LeaderNetworkExecutor getLeader()

getServerName

public String getServerName()

getClusterName

public String getClusterName()

registerIncomingConnection

public void registerIncomingConnection(String replicaServerName,
                                       Leader2ReplicaNetworkExecutor connection)

getElectionStatus

public HAServer.ELECTION_STATUS getElectionStatus()

setElectionStatus

protected void setElectionStatus(HAServer.ELECTION_STATUS status)

getMessageFactory

public HAMessageFactory getMessageFactory()

setServerAddresses

public void setServerAddresses(String serverAddress)

forwardCommandToLeader

public Object forwardCommandToLeader(HACommand command,
                                     long timeout)

Forward a command to the leader server. This occurs with transactions and DDL commands. If the timeout is 0, then the request is asynchronous and the response is a Resultset containing `{"operation", "forwarded to the leader"}`

Parameters:

command - HACommand to forward

timeout - Timeout in milliseconds. 0 for asynchronous commands

Returns:

the result from the command if synchronous, otherwise a result set containing `{"operation", "forwarded to the leader"}`

sendCommandToReplicasNoLog

public void sendCommandToReplicasNoLog(HACommand command)

sendCommandToReplicasWithQuorum

public List<Object> sendCommandToReplicasWithQuorum(HACommand command,
                                                    int quorum,
                                                    long timeout)

getMessagesInQueue

public int getMessagesInQueue()

setReplicasHTTPAddresses

public void setReplicasHTTPAddresses(String replicasHTTPAddresses)

getReplicaServersHTTPAddressesList

public String getReplicaServersHTTPAddressesList()

removeServer

public void removeServer(String remoteServerName)

getOnlineServers

public int getOnlineServers()

getOnlineReplicas

public int getOnlineReplicas()

getConfiguredServers

public int getConfiguredServers()

getServerAddressList

public String getServerAddressList()

printClusterConfiguration

public void printClusterConfiguration()

getStats

public JSONObject getStats()

getServerAddress

public String getServerAddress()

toString

public String toString()

Overrides:

toString in class Object

resendMessagesToReplica

public void resendMessagesToReplica(long fromMessageNumber,
                                    String replicaName)

connectToLeader

public boolean connectToLeader(String serverEntry,
                               Callable<Void,Exception> errorCallback)

createNetworkConnection

protected ChannelBinaryClient createNetworkConnection(String host,
                                                      int port,
                                                      short commandId)
                                               throws IOException

Throws:

IOException