/**
* Unit test for the protocol up to a service join, which triggers a leader election. Since the
* singleton quorum has only one member our client will be elected the leader.
*
* @throws InterruptedException
*/
public void test_serviceJoin() throws InterruptedException {
final AbstractQuorum<?, ?> quorum = quorums[0];
final MockQuorumMember<?> client = clients[0];
final QuorumActor<?, ?> actor = actors[0];
final UUID serviceId = client.getServiceId();
final long lastCommitTime = 0L;
final long lastCommitTime2 = 2L;
// declare the service as a quorum member.
actor.memberAdd();
fixture.awaitDeque();
assertTrue(client.isMember());
assertEquals(new UUID[] {serviceId}, quorum.getMembers());
// add to the pipeline.
actor.pipelineAdd();
fixture.awaitDeque();
assertTrue(client.isPipelineMember());
assertEquals(new UUID[] {serviceId}, quorum.getPipeline());
// cast a vote for a lastCommitTime.
actor.castVote(lastCommitTime);
fixture.awaitDeque();
assertEquals(1, quorum.getVotes().size());
assertEquals(new UUID[] {serviceId}, quorum.getVotes().get(lastCommitTime));
// verify the consensus was updated.
assertEquals(lastCommitTime, client.lastConsensusValue);
// wait for quorum meet.
final long token1 = quorum.awaitQuorum();
// verify service was joined.
assertTrue(client.isJoinedMember(quorum.token()));
assertEquals(new UUID[] {serviceId}, quorum.getJoined());
// validate the token was assigned.
fixture.awaitDeque();
assertEquals(Quorum.NO_QUORUM + 1, quorum.lastValidToken());
assertEquals(Quorum.NO_QUORUM + 1, quorum.token());
assertTrue(quorum.isQuorumMet());
/*
* Do service leave, quorum should break.
*/
actor.serviceLeave();
fixture.awaitDeque();
quorum.awaitBreak();
// vote was withdrawn.
assertEquals(0, quorum.getVotes().size());
assertEquals(null, quorum.getVotes().get(lastCommitTime));
// verify the consensus was updated.
assertEquals(-1L, client.lastConsensusValue);
assertFalse(quorum.isQuorumMet());
assertEquals(Quorum.NO_QUORUM, quorum.token());
assertEquals(token1, quorum.lastValidToken());
assertFalse(client.isJoinedMember(quorum.token()));
assertEquals(new UUID[] {}, quorum.getJoined());
assertFalse(client.isPipelineMember());
assertEquals(new UUID[] {}, quorum.getPipeline());
/*
* Cast another vote, the quorum should meet again.
*/
actor.pipelineAdd();
fixture.awaitDeque();
actor.castVote(lastCommitTime2);
fixture.awaitDeque();
assertEquals(1, quorum.getVotes().size());
assertEquals(null, quorum.getVotes().get(lastCommitTime));
assertEquals(new UUID[] {serviceId}, quorum.getVotes().get(lastCommitTime2));
// verify the consensus was updated.
assertEquals(lastCommitTime2, client.lastConsensusValue);
// await meet.
final long token2 = quorum.awaitQuorum();
// verify the joined services.
assertEquals(new UUID[] {serviceId}, quorum.getJoined());
// validate the token was assigned by the leader.
assertTrue(quorum.isQuorumMet());
assertEquals(token1 + 1, token2);
assertEquals(token1 + 1, quorum.lastValidToken());
assertTrue(client.isJoinedMember(token2));
assertTrue(client.isLeader(token2));
assertFalse(client.isFollower(token2));
/*
* Do service leave, quorum should break again.
*/
actor.serviceLeave();
fixture.awaitDeque();
quorum.awaitBreak();
// vote was withdrawn.
assertEquals(0, quorum.getVotes().size());
assertEquals(null, quorum.getVotes().get(lastCommitTime));
assertEquals(null, quorum.getVotes().get(lastCommitTime2));
// verify the consensus was updated.
assertEquals(-1L, client.lastConsensusValue);
assertFalse(quorum.isQuorumMet());
assertEquals(Quorum.NO_QUORUM, quorum.token());
assertEquals(token2, quorum.lastValidToken());
assertFalse(client.isJoinedMember(quorum.token()));
assertEquals(new UUID[] {}, quorum.getJoined());
assertFalse(client.isPipelineMember());
assertEquals(new UUID[] {}, quorum.getPipeline());
}
