Java ServerState类代码示例

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * In the case there is a leader elected, and a quorum supporting this
 * leader, we have to check if the leader has voted and acked that it is
 * leading. We need this check to avoid that peers keep electing over and
 * over a peer that has crashed and it is no longer leading.
 *
 * @param votes
 *            set of votes
 * @param leader
 *            leader id
 * @param electionEpoch
 *            epoch id
 */
protected boolean checkLeader(HashMap<Long, Vote> votes, long leader, long electionEpoch) {

	boolean predicate = true;

	/*
	 * If everyone else thinks I'm the leader, I must be the leader. The
	 * other two checks are just for the case in which I'm not the leader.
	 * If I'm not the leader and I haven't received a message from leader
	 * stating that it is leading, then predicate is false.
	 */

	if (leader != self.getId()) {
		if (votes.get(leader) == null)
			predicate = false;
		else if (votes.get(leader).getState() != ServerState.LEADING)
			predicate = false;
	} else if (logicalclock != electionEpoch) {
		predicate = false;
	}

	return predicate;
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
public void run(){
    try{
        Vote v = null;
        peer.setPeerState(ServerState.LOOKING);
        LOG.info("Going to call leader election: " + i);
        v = peer.getElectionAlg().lookForLeader();

        if (v == null){
            Assert.fail("Thread " + i + " got a null vote");
        }

        /*
         * A real zookeeper would take care of setting the current vote. Here
         * we do it manually.
         */
        peer.setCurrentVote(v);

        LOG.info("Finished election: " + i + ", " + v.getId());

        Assert.assertTrue("State is not leading.", peer.getPeerState() == ServerState.LEADING);
    } catch (Exception e) {
        e.printStackTrace();
    }
    LOG.info("Joining");
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
public void run(){            
    try{
        Vote v = null;
        peer.setPeerState(ServerState.LOOKING);
        LOG.info("Going to call leader election: " + i);
        v = peer.getElectionAlg().lookForLeader();

        if (v == null){
            Assert.fail("Thread " + i + " got a null vote");
        }                                

        /*
         * A real zookeeper would take care of setting the current vote. Here
         * we do it manually.
         */
        peer.setCurrentVote(v);

        LOG.info("Finished election: " + i + ", " + v.getId());
    } catch (Exception e) {
        e.printStackTrace();
    }
    LOG.info("Joining");
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
public void run() {
    setName("VerifyState-" + peer.getId());
    while (true) {
        if(peer.getPeerState() == ServerState.FOLLOWING) {
            LOG.info("I am following");
            success = true;
            break;
        } else if (peer.getPeerState() == ServerState.LEADING) {
            LOG.info("I am leading");
            success = false;
            break;
        }
        try {
            Thread.sleep(250);
        } catch (Exception e) {
            LOG.warn("Sleep failed ", e);
        }
    }
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
ToSend(mType type,
        long leader,
        long zxid,
        long electionEpoch,
        ServerState state,
        long sid,
        long peerEpoch,
        byte[] configData) {

    this.leader = leader;
    this.zxid = zxid;
    this.electionEpoch = electionEpoch;
    this.state = state;
    this.sid = sid;
    this.peerEpoch = peerEpoch;
    this.configData = configData;
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * Send notifications to all peers upon a change in our vote
 */
private void sendNotifications() {
    for (long sid : self.getCurrentAndNextConfigVoters()) {
        QuorumVerifier qv = self.getQuorumVerifier();
        ToSend notmsg = new ToSend(ToSend.mType.notification,
                proposedLeader,
                proposedZxid,
                logicalclock.get(),
                QuorumPeer.ServerState.LOOKING,
                sid,
                proposedEpoch, qv.toString().getBytes());
        if(LOG.isDebugEnabled()){
            LOG.debug("Sending Notification: " + proposedLeader + " (n.leader), 0x"  +
                  Long.toHexString(proposedZxid) + " (n.zxid), 0x" + Long.toHexString(logicalclock.get())  +
                  " (n.round), " + sid + " (recipient), " + self.getId() +
                  " (myid), 0x" + Long.toHexString(proposedEpoch) + " (n.peerEpoch)");
        }
        sendqueue.offer(notmsg);
    }
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * In the case there is a leader elected, and a quorum supporting
 * this leader, we have to check if the leader has voted and acked
 * that it is leading. We need this check to avoid that peers keep
 * electing over and over a peer that has crashed and it is no
 * longer leading.
 *
 * @param votes set of votes
 * @param   leader  leader id
 * @param   electionEpoch   epoch id
 */
private boolean checkLeader(
        Map<Long, Vote> votes,
        long leader,
        long electionEpoch){

    boolean predicate = true;

    /*
     * If everyone else thinks I'm the leader, I must be the leader.
     * The other two checks are just for the case in which I'm not the
     * leader. If I'm not the leader and I haven't received a message
     * from leader stating that it is leading, then predicate is false.
     */

    if(leader != self.getId()){
        if(votes.get(leader) == null) predicate = false;
        else if(votes.get(leader).getState() != ServerState.LEADING) predicate = false;
    } else if(logicalclock.get() != electionEpoch) {
        predicate = false;
    }

    return predicate;
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
public void run() {
    try {
        Vote v = null;
        peer.setPeerState(ServerState.LOOKING);
        LOG.info("Going to call leader election: {}", i);
        v = peer.getElectionAlg().lookForLeader();

        if (v == null) {
            Assert.fail("Thread " + i + " got a null vote");
        }

        /*
         * A real zookeeper would take care of setting the current vote. Here
         * we do it manually.
         */
        peer.setCurrentVote(v);

        LOG.info("Finished election: {}, {}", i, v.getId());

        Assert.assertTrue("State is not leading.", peer.getPeerState() == ServerState.LEADING);
    } catch (Exception e) {
        e.printStackTrace();
    }
    LOG.info("Joining");
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * Send notifications to all peers upon a change in our vote
 */
private void sendNotifications() {
    for (QuorumServer server : self.getVotingView().values()) {
        long sid = server.id;

        ToSend notmsg = new ToSend(ToSend.mType.notification,
                proposedLeader,
                proposedZxid,
                logicalclock,
                QuorumPeer.ServerState.LOOKING,
                sid,
                proposedEpoch);
        if(LOG.isDebugEnabled()){
            LOG.debug("Sending Notification: " + proposedLeader + " (n.leader), 0x"  +
                  Long.toHexString(proposedZxid) + " (n.zxid), 0x" + Long.toHexString(logicalclock)  +
                  " (n.round), " + sid + " (recipient), " + self.getId() +
                  " (myid), 0x" + Long.toHexString(proposedEpoch) + " (n.peerEpoch)");
        }
        sendqueue.offer(notmsg);
    }
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * In the case there is a leader elected, and a quorum supporting
 * this leader, we have to check if the leader has voted and acked
 * that it is leading. We need this check to avoid that peers keep
 * electing over and over a peer that has crashed and it is no
 * longer leading.
 *
 * @param votes set of votes
 * @param   leader  leader id
 * @param   electionEpoch   epoch id
 */
protected boolean checkLeader(
        HashMap<Long, Vote> votes,
        long leader,
        long electionEpoch){

    boolean predicate = true;

    /*
     * If everyone else thinks I'm the leader, I must be the leader.
     * The other two checks are just for the case in which I'm not the
     * leader. If I'm not the leader and I haven't received a message
     * from leader stating that it is leading, then predicate is false.
     */

    if(leader != self.getId()){
        if(votes.get(leader) == null) predicate = false;
        else if(votes.get(leader).getState() != ServerState.LEADING) predicate = false;
    } else if(logicalclock != electionEpoch) {
        predicate = false;
    } 

    return predicate;
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
private void shutdownQP(QuorumPeer qp) throws InterruptedException {
    assertNotNull("QuorumPeer doesn't exist!", qp);
    qp.shutdown();

    int retryCnt = 30;
    while (retryCnt > 0) {
        if (qp.getPeerState() == ServerState.LOOKING) {
            LOG.info("Number of retries:{} to change the server state to {}",
                    retryCnt, ServerState.LOOKING);
            break;
        }
        Thread.sleep(500);
        retryCnt--;
    }
    Assert.assertEquals(
            "After shutdown, QuorumPeer should change its state to LOOKING",
            ServerState.LOOKING, qp.getPeerState());
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
private void verifyElectionTimeTakenJMXAttribute(List<QuorumPeer> peers)
        throws Exception {
    LOG.info("Verify QuorumPeer#electionTimeTaken jmx bean attribute");

    for (int i = 1; i <= peers.size(); i++) {
        QuorumPeer qp = peers.get(i - 1);
        if (qp.getLearnerType() == LearnerType.OBSERVER) {
            continue; // Observer don't have electionTimeTaken attribute.
        }
        Long electionTimeTaken = -1L;
        String bean = "";
        if (qp.getPeerState() == ServerState.FOLLOWING) {
            bean = String.format(
                    "%s:name0=ReplicatedServer_id%d,name1=replica.%d,name2=Follower",
                    CommonNames.DOMAIN, i, i);
        } else if (qp.getPeerState() == ServerState.LEADING) {
            bean = String.format(
                    "%s:name0=ReplicatedServer_id%d,name1=replica.%d,name2=Leader",
                    CommonNames.DOMAIN, i, i);
        }
        electionTimeTaken = (Long) JMXEnv.ensureBeanAttribute(bean,
                "ElectionTimeTaken");
        Assert.assertTrue("Wrong electionTimeTaken value!",
                electionTimeTaken >= 0);
    }
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * In the case there is a leader elected, and a quorum supporting
 * this leader, we have to check if the leader has voted and acked
 * that it is leading. We need this check to avoid that peers keep
 * electing over and over a peer that has crashed and it is no
 * longer leading.
 *
 * @param votes set of votes
 * @param   leader  leader id
 * @param   electionEpoch   epoch id
 */
private boolean checkLeader(
        HashMap<Long, Vote> votes,
        long leader,
        long electionEpoch){

    boolean predicate = true;

    /*
     * If everyone else thinks I'm the leader, I must be the leader.
     * The other two checks are just for the case in which I'm not the
     * leader. If I'm not the leader and I haven't received a message
     * from leader stating that it is leading, then predicate is false.
     */

    if(leader != self.getId()){
        if(votes.get(leader) == null) predicate = false;
        else if(votes.get(leader).getState() != ServerState.LEADING) predicate = false;
    } else if(logicalclock != electionEpoch) {
        predicate = false;
    } 

    return predicate;
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * Send notifications to all peers upon a change in our vote
 */
private void sendNotifications() {
    for (QuorumServer server : self.getVotingView().values()) {
        long sid = server.id;

        ToSend notmsg = new ToSend(ToSend.mType.notification,
                proposedLeader,
                proposedZxid,
                logicalclock,
                QuorumPeer.ServerState.LOOKING,
                sid,
                proposedEpoch);
        if(LOG.isDebugEnabled()){
            LOG.debug("Sending Notification: " + proposedLeader + " (n.leader), "  +
                  proposedZxid + " (n.zxid), " + logicalclock  +
                  " (n.round), " + sid + " (recipient), " + self.getId() +
                  " (myid), " + proposedEpoch + " (n.peerEpoch)");
        }
        sendqueue.offer(notmsg);
    }
}
 

import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState; //导入依赖的package包/类
/**
 * In the case there is a leader elected, and a quorum supporting
 * this leader, we have to check if the leader has voted and acked
 * that it is leading. We need this check to avoid that peers keep
 * electing over and over a peer that has crashed and it is no
 * longer leading.
 *
 * @param votes set of votes
 * @param   leader  leader id
 * @param   electionEpoch   epoch id
 */
private boolean checkLeader(
        HashMap<Long, Vote> votes,
        long leader,
        long electionEpoch){

    boolean predicate = true;

    /*
     * If everyone else thinks I'm the leader, I must be the leader.
     * The other two checks are just for the case in which I'm not the
     * leader. If I'm not the leader and I haven't received a message
     * from leader stating that it is leading, then predicate is false.
     */

    if(leader != self.getId()){
        if(votes.get(leader) == null) predicate = false;
        else if(votes.get(leader).getState() != ServerState.LEADING) predicate = false;
    } else if(logicalclock.get() != electionEpoch) {
        predicate = false;
    }

    return predicate;
}