Package io.atomix.raft.storage.system

Class MetaStore

java.lang.Object

io.atomix.raft.storage.system.MetaStore

All Implemented Interfaces:

JournalMetaStore, AutoCloseable

public class MetaStore
extends Object
implements JournalMetaStore, AutoCloseable

Manages persistence of server configurations.

The server metastore is responsible for persisting server configurations. 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.

Nested Class Summary

Nested classes/interfaces inherited from interface io.camunda.zeebe.journal.JournalMetaStore

JournalMetaStore.InMemory

Constructor Summary

Constructors

Constructor	Description
MetaStore(RaftStorage storage)

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	hasLastFlushedIndex()
Configuration	loadConfiguration()	Loads the current cluster configuration.
long	loadLastFlushedIndex()
long	loadTerm()	Loads the stored server term.
MemberId	loadVote()	Loads the last vote for the server.
void	resetLastFlushedIndex()
void	storeConfiguration(Configuration configuration)	Stores the current cluster configuration.
void	storeLastFlushedIndex(long index)
void	storeTerm(long term)	Stores the current server term.
void	storeVote(MemberId vote)	Stores the last voted server.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

MetaStore

public MetaStore(RaftStorage storage)
          throws IOException

Throws:

IOException

Method Details

storeTerm

public void storeTerm(long term)

Stores the current server term.

Parameters:

term - The current server term.

loadTerm

public long loadTerm()

Loads the stored server term.

Returns:

The stored server term.

storeVote

public void storeVote(MemberId vote)

Stores the last voted server.

Parameters:

vote - The server vote.

loadVote

public MemberId loadVote()

Loads the last vote for the server.

Returns:

The last vote for the server.

storeLastFlushedIndex

public void storeLastFlushedIndex(long index)

Specified by:

storeLastFlushedIndex in interface JournalMetaStore

loadLastFlushedIndex

public long loadLastFlushedIndex()

Specified by:

loadLastFlushedIndex in interface JournalMetaStore

resetLastFlushedIndex

public void resetLastFlushedIndex()

Specified by:

resetLastFlushedIndex in interface JournalMetaStore

hasLastFlushedIndex

public boolean hasLastFlushedIndex()

Specified by:

hasLastFlushedIndex in interface JournalMetaStore

storeConfiguration

public void storeConfiguration(Configuration configuration)

Stores the current cluster configuration.

Parameters:

configuration - The current cluster configuration.

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