io.atomix.copycat.server.storage.system

Class MetaStore

java.lang.Object

io.atomix.copycat.server.storage.system.MetaStore

All Implemented Interfaces:

AutoCloseable

public class MetaStore
extends Object
implements AutoCloseable

Manages persistence of server configurations.

The server metastore is responsible for persisting server configurations according to the configured storage level. Each server persists their current term and last vote as is dictated by the Raft consensus algorithm. Additionally, the metastore is responsible for storing the last know server Configuration, including cluster membership.

Author:

Constructor Summary

Constructors

Constructor and Description
MetaStore(String name, Storage storage, Serializer serializer)

Method Summary

Modifier and Type	Method and Description
void	close()
Configuration	loadConfiguration() Loads the current cluster configuration.
long	loadTerm() Loads the stored server term.
int	loadVote() Loads the last vote for the server.
Serializer	serializer() Returns the metastore serializer.
MetaStore	storeConfiguration(Configuration configuration) Stores the current cluster configuration.
MetaStore	storeTerm(long term) Stores the current server term.
MetaStore	storeVote(int vote) Stores the last voted server.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MetaStore

public MetaStore(String name,
                 Storage storage,
                 Serializer serializer)

Method Detail

serializer

public Serializer serializer()

Returns the metastore serializer.

Returns:

The metastore serializer.

storeTerm

public MetaStore storeTerm(long term)

Stores the current server term.

Parameters:

term - The current server term.

Returns:

The metastore.

loadTerm

public long loadTerm()

Loads the stored server term.

Returns:

The stored server term.

storeVote

public MetaStore storeVote(int vote)

Stores the last voted server.

Parameters:

vote - The server vote.

Returns:

The metastore.

loadVote

public int loadVote()

Loads the last vote for the server.

Returns:

The last vote for the server.

storeConfiguration

public MetaStore storeConfiguration(Configuration configuration)

Stores the current cluster configuration.

Parameters:

configuration - The current cluster configuration.

Returns:

The metastore.

loadConfiguration

public Configuration loadConfiguration()

Loads the current cluster configuration.

Returns:

The current cluster configuration.

close

public void close()

Specified by:

close in interface AutoCloseable

toString

public String toString()

Overrides:

toString in class Object