com.sleepycat.je.rep.stream

Class MasterSuggestionGenerator

java.lang.Object

com.sleepycat.je.rep.stream.MasterSuggestionGenerator

All Implemented Interfaces:

Acceptor.SuggestionGenerator

public class MasterSuggestionGenerator
extends java.lang.Object
implements Acceptor.SuggestionGenerator

A Basic suggestion generator. A more sophisticated version may contact other replica nodes to see if it has sufficient connectivity to implement the commit policy in effect for the Replication Group. KIS for now.

Constructor Summary

Constructors

Constructor and Description
MasterSuggestionGenerator(RepNode repNode)

Method Summary

Methods

Modifier and Type	Method and Description
void	forceMaster(boolean force) This entry point is for testing only.
Protocol.Value	get(Proposer.Proposal proposal) Used to generate a suggested value for use by a Proposer.
long	getRanking(Proposer.Proposal proposal) The importance associated with the above suggestion.

Methods inherited from class java.lang.Object

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

Constructor Detail

MasterSuggestionGenerator

public MasterSuggestionGenerator(RepNode repNode)

Method Detail

get

public Protocol.Value get(Proposer.Proposal proposal)

Description copied from interface: Acceptor.SuggestionGenerator

Used to generate a suggested value for use by a Proposer. It's a hint. The proposal argument may be used to freeze values like the VLSN number from advancing (if they were used in the ranking) until an election has completed.

Specified by:

get in interface Acceptor.SuggestionGenerator

Parameters:

proposal - the Proposal for which the value is being suggested.

Returns:

the suggested value.

getRanking

public long getRanking(Proposer.Proposal proposal)

Description copied from interface: Acceptor.SuggestionGenerator

The importance associated with the above suggestion. Acceptors have to agree on a common system for ranking importance so that the relative importance of different suggestions can be meaningfully compared.

Specified by:

getRanking in interface Acceptor.SuggestionGenerator

Returns:

the importance of the suggestion as a number

forceMaster

public void forceMaster(boolean force)

This entry point is for testing only. It will submit a Proposal with a premptive ranking so that it's guaranteed to be the selected as the master at the next election.

Parameters:

force - determines whether the forced proposal is in effect