com.singlestore.jdbc.export

Enum HaMode

java.lang.Object

java.lang.Enum<HaMode>

com.singlestore.jdbc.export.HaMode

All Implemented Interfaces:

Serializable, Comparable<HaMode>

public enum HaMode
extends Enum<HaMode>

Failover (High-availability) mode

Enum Constant Summary

Enum Constants

Enum Constant and Description
LOADBALANCE load-balance: driver will connect to any host using round-robin, permitting balancing connections
NONE no ha-mode.
SEQUENTIAL

Method Summary

Modifier and Type	Method and Description
static HaMode	from(String value) Get HAMode from values or aliases
abstract Optional<HostAddress>	getAvailableHost(List<HostAddress> hostAddresses, ConcurrentMap<HostAddress,Long> denyList) List of hosts without blacklist entries, ordered according to HA mode
static Optional<HostAddress>	getAvailableHostInOrder(List<HostAddress> hostAddresses, ConcurrentMap<HostAddress,Long> denyList) Get first available host not in blacklist.
static Optional<HostAddress>	getAvailableRoundRobinHost(HaMode haMode, List<HostAddress> hostAddresses, ConcurrentMap<HostAddress,Long> denyList) Get first available host in RoundRobin Order and not in blacklist.
static HostAddress	getHostWithLessConnections(List<HostAddress> hostAddresses, ConcurrentMap<HostAddress,Long> denyList) If all hosts not blacklisted connection number are known, choose the host with the less connections.
void	resetLast() For testing purpose only
static HaMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static HaMode[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

SEQUENTIAL

public static final HaMode SEQUENTIAL

LOADBALANCE

public static final HaMode LOADBALANCE

load-balance: driver will connect to any host using round-robin, permitting balancing connections

NONE

public static final HaMode NONE

no ha-mode. Connect to first host only

Method Detail

values

public static HaMode[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (HaMode c : HaMode.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static HaMode valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

from

public static HaMode from(String value)

Get HAMode from values or aliases

Parameters:

value - value or alias

Returns:

HaMode if corresponding mode is found

getAvailableHostInOrder

public static Optional<HostAddress> getAvailableHostInOrder(List<HostAddress> hostAddresses,
                                                            ConcurrentMap<HostAddress,Long> denyList)

Get first available host not in blacklist.

Parameters:

hostAddresses - hosts

denyList - blacklist

Returns:

list without denied hosts

getHostWithLessConnections

public static HostAddress getHostWithLessConnections(List<HostAddress> hostAddresses,
                                                     ConcurrentMap<HostAddress,Long> denyList)

If all hosts not blacklisted connection number are known, choose the host with the less connections.

Parameters:

hostAddresses - host addresses

denyList - blacklist

Returns:

the host with less connection, or null if unknown.

getAvailableRoundRobinHost

public static Optional<HostAddress> getAvailableRoundRobinHost(HaMode haMode,
                                                               List<HostAddress> hostAddresses,
                                                               ConcurrentMap<HostAddress,Long> denyList)

Get first available host in RoundRobin Order and not in blacklist.

Parameters:

haMode - current haMode

hostAddresses - hosts

denyList - blacklist

Returns:

list without denied hosts

resetLast

public void resetLast()

For testing purpose only

getAvailableHost

public abstract Optional<HostAddress> getAvailableHost(List<HostAddress> hostAddresses,
                                                       ConcurrentMap<HostAddress,Long> denyList)

List of hosts without blacklist entries, ordered according to HA mode

Parameters:

hostAddresses - hosts

denyList - hosts temporary denied

Returns:

list without denied hosts