com.sleepycat.je.rep.elections

Class RankingProposer

java.lang.Object

com.sleepycat.je.rep.elections.Proposer

com.sleepycat.je.rep.elections.RankingProposer

public class RankingProposer
extends Proposer

Extends the base proposer to choose a phase 2 value based on a suggestion's relative ranking.

Nested Class Summary

Nested classes/interfaces inherited from class com.sleepycat.je.rep.elections.Proposer

Proposer.ExitElectionException, Proposer.Proposal, Proposer.ProposalParser, Proposer.RetryPredicate, Proposer.WinningProposal

Field Summary

Fields inherited from class com.sleepycat.je.rep.elections.Proposer

elections, formatter, logger, phase1Arbiter, phase1NoNonZeroPrio

Constructor Summary

Constructors

Constructor and Description
RankingProposer(Elections elections, NameIdPair nameIdPair)

Method Summary

Modifier and Type	Method and Description
protected Protocol.Value	choosePhase2Value(Set<TextProtocol.MessageExchange> exchanges) Chooses a Value based on the relative ranking of all Promise responses.
Proposer.Proposal	nextProposal() Returns a proposal number.

Methods inherited from class com.sleepycat.je.rep.elections.Proposer

getProposerStats, issueProposal, shutdown

Methods inherited from class java.lang.Object

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

Constructor Detail

RankingProposer

public RankingProposer(Elections elections,
                       NameIdPair nameIdPair)

Method Detail

choosePhase2Value

protected Protocol.Value choosePhase2Value(Set<TextProtocol.MessageExchange> exchanges)

Chooses a Value based on the relative ranking of all Promise responses. The one with the highest ranking is chosen. Zero priority responses are never chosen. In the case of a tie, priority is used to resolve it. If priority is insufficient the socket address is used to order the choice so that a consistent result is obtained across the set irrespective of the iteration order over the set.

Specified by:

choosePhase2Value in class Proposer

Parameters:

exchanges - the message exchanges from Phase 1

Returns:

the candidate value for Phase2, or null, if no suitable value was found during phase 1

nextProposal

public Proposer.Proposal nextProposal()

Returns a proposal number. Note that the proposal numbers must increase over time, even across restarts of the proposer process.

Specified by:

nextProposal in class Proposer

Returns:

a 24 character string representing the proposal number