Package io.hekate.cluster.split

Class AddressReachabilityDetector

java.lang.Object

io.hekate.cluster.split.AddressReachabilityDetector

All Implemented Interfaces:

SplitBrainDetector, ConfigReportSupport

public class AddressReachabilityDetector
extends Object
implements SplitBrainDetector, ConfigReportSupport

Socket address connectivity-based detector.

This implementation of SplitBrainDetector tries to establish a socket connection to check if some pre-configured address is reachable. Assumption is that if local node can connect to that address then it is not cut off the network and can communicate with other nodes.

Note that it is possible to combine multiple detectors with the help of SplitBrainDetectorGroup.

See Also:

ClusterServiceFactory.setSplitBrainDetector(SplitBrainDetector)

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_TIMEOUT	Default value (=3000) in milliseconds for the timeout parameter of AddressReachabilityDetector(String, int).

Constructor Summary

Constructors

Constructor	Description
AddressReachabilityDetector(String address)	Constructs new instance with the default timeout value (=3000).
AddressReachabilityDetector(String address, int timeout)	Constructs new instance.
AddressReachabilityDetector(InetSocketAddress address, int timeout)	Constructs new instance.

Method Summary

Modifier and Type	Method	Description
InetSocketAddress	address()	Address to check.
boolean	isValid(ClusterNode localNode)	Performs a split-brain check and returns true if local node can reach other members of the cluster.
void	report(ConfigReporter report)	Report configuration.
int	timeout()	Check timeout in milliseconds.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_TIMEOUT

public static final int DEFAULT_TIMEOUT

Default value (=3000) in milliseconds for the timeout parameter of AddressReachabilityDetector(String, int).

See Also:

Constant Field Values

Constructor Detail

AddressReachabilityDetector

public AddressReachabilityDetector(String address)

Constructs new instance with the default timeout value (=3000).

Parameters:

address - Address in a form of <host>:<port> (f.e. 192.168.39.41:10012).

AddressReachabilityDetector

public AddressReachabilityDetector(String address,
                                   int timeout)

Constructs new instance.

Parameters:

address - Address in a form of <host>:<port> (f.e. 192.168.39.41:10012).

timeout - Connect timeout in milliseconds (see Socket.connect(SocketAddress, int)).

AddressReachabilityDetector

public AddressReachabilityDetector(InetSocketAddress address,
                                   int timeout)

Constructs new instance.

Parameters:

address - Address.

timeout - Connect timeout in milliseconds (see Socket.connect(SocketAddress, int)).

Method Detail

report

public void report(ConfigReporter report)

Description copied from interface: ConfigReportSupport

Report configuration.

Specified by:

report in interface ConfigReportSupport

Parameters:

report - Reporter.

address

public InetSocketAddress address()

Address to check.

Returns:

Address to check.

timeout

public int timeout()

Check timeout in milliseconds.

Returns:

Timeout in milliseconds.

isValid

public boolean isValid(ClusterNode localNode)

Description copied from interface: SplitBrainDetector

Performs a split-brain check and returns true if local node can reach other members of the cluster.

If this method returns false then HekateFatalErrorPolicy will be applied with ClusterSplitBrainException as a cause.

Specified by:

isValid in interface SplitBrainDetector

Parameters:

localNode - Local node (where the check is performed).

Returns:

true if local node can reach other members of the cluster.

toString

public String toString()

Overrides:

toString in class Object