Package io.permazen.kv.raft.fallback

Class NullMergeStrategy

java.lang.Object

io.permazen.kv.raft.fallback.NullMergeStrategy

All Implemented Interfaces:

MergeStrategy

public class NullMergeStrategy
extends Object
implements MergeStrategy

MergeStrategy that does nothing, i.e., it leaves the destination database unmodified.

Constructor Summary

Constructors

Constructor	Description
NullMergeStrategy()

Method Summary

Modifier and Type	Method	Description
void	mergeAndCommit(KVTransaction src, KVTransaction dst, Date lastActiveTime)	Merge data from the source database being migrated away from into the destination database being migrated to.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

NullMergeStrategy

public NullMergeStrategy()

Method Details

mergeAndCommit

public void mergeAndCommit(KVTransaction src,
 KVTransaction dst,
 Date lastActiveTime)

Description copied from interface: MergeStrategy

Merge data from the source database being migrated away from into the destination database being migrated to.

This method should commit() both transactions before returning; src should be committed before dst.

If an exception is thrown, rollback() will be invoked on both transactions (a rollback() on an already-commit()'ed transaction does nothing).

Specified by:

mergeAndCommit in interface MergeStrategy

Parameters:

src - read-only view into the database being migrated away from

dst - read-write transaction open on the database being migrated to

lastActiveTime - time that dst was last active, or null if never

toString

public String toString()

Overrides:

toString in class Object