org.jgroups.protocols.VERIFY_SUSPECT java code examples

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/**
 * Sends ARE_YOU_DEAD message to suspected_mbr, wait for return or timeout
 */
protected void verifySuspect(Collection<Address> mbrs) {
  if(mbrs == null || mbrs.isEmpty())
    return;
  if(addSuspects(mbrs)) {
    startTimer(); // start timer before we send out are you dead messages
    log.trace("verifying that %s %s dead", mbrs, mbrs.size() == 1? "is" : "are");
  }
  for(Address mbr: mbrs) {
    for(int i=0; i < num_msgs; i++) {
      Message msg=new Message(mbr).setFlag(Message.Flag.INTERNAL)
       .putHeader(this.id, new VerifyHeader(VerifyHeader.ARE_YOU_DEAD, local_addr));
      down_prot.down(msg);
    }
  }
}

public Object up(Event evt) {
  switch(evt.getType()) {
    case Event.SUSPECT:  // it all starts here ...
      // todo: change to collections in 4.1
      Collection<Address> s=evt.arg() instanceof Address? Collections.singletonList(evt.arg()) : evt.arg();
      if(s == null)
        return null;
      s.remove(local_addr); // ignoring suspect of self
      if(use_icmp)
        s.forEach(this::verifySuspectWithICMP);
      else
        verifySuspect(s);
      return null;  // don't pass up; we will decide later (after verification) whether to pass it up
    case Event.CONFIG:
      if(bind_addr == null) {
        Map<String,Object> config=evt.getArg();
        bind_addr=(InetAddress)config.get("bind_addr");
      }
  }
  return up_prot.up(evt);
}

public Object down(Event evt) {
  switch(evt.getType()) {
    case Event.SET_LOCAL_ADDRESS:
      local_addr=evt.getArg();
      break;
    case Event.VIEW_CHANGE:
      View v=evt.getArg();
      adjustSuspectedMembers(v.getMembers());
      break;
  }
  return down_prot.down(evt);
}

protected void verifySuspectWithICMP(Address suspected_mbr) {
  InetAddress host=suspected_mbr instanceof IpAddress? ((IpAddress)suspected_mbr).getIpAddress() : null;
  if(host == null)
    throw new IllegalArgumentException("suspected_mbr is not of type IpAddress - FD_ICMP only works with these");
  try {
    if(log.isTraceEnabled())
      log.trace("pinging host " + suspected_mbr + " using interface " + intf);
    long start=getCurrentTimeMillis(), stop;
    boolean rc=host.isReachable(intf, 0, (int)timeout);
    stop=getCurrentTimeMillis();
    if(rc) // success
      log.trace("successfully received response from " + host + " (after " + (stop-start) + "ms)");
    else { // failure
      log.debug("failed pinging " + suspected_mbr + " after " + (stop-start) + "ms; passing up SUSPECT event");
      removeSuspect(suspected_mbr);
      up_prot.up(new Event(Event.SUSPECT, Collections.singletonList(suspected_mbr)));
    }
  }
  catch(Exception ex) {
    log.error(Util.getMessage("FailedPinging"),suspected_mbr, ex);
  }
}

  verifySuspect(suspected_mbr);
else
  verifySuspectWithICMP(suspected_mbr);
return null;  // don't pass up; we will decide later (after verification) whether to pass it up
      return null;
    unsuspect(hdr.from);
    return null;

public Object up(Message msg) {
  VerifyHeader hdr=msg.getHeader(this.id);
  if(hdr == null)
    return up_prot.up(msg);
  switch(hdr.type) {
    case VerifyHeader.ARE_YOU_DEAD:
      if(hdr.from == null) {
        log.error(Util.getMessage("AREYOUDEADHdrFromIsNull"));
        return null;
      }
      Address target=use_mcast_rsps? null : hdr.from;
      for(int i=0; i < num_msgs; i++) {
        Message rsp=new Message(target).setFlag(Message.Flag.INTERNAL)
         .putHeader(this.id, new VerifyHeader(VerifyHeader.I_AM_NOT_DEAD, local_addr));
        down_prot.down(rsp);
      }
      return null;
    case VerifyHeader.I_AM_NOT_DEAD:
      if(hdr.from == null) {
        log.error(Util.getMessage("IAMNOTDEADHdrFromIsNull"));
        return null;
      }
      unsuspect(hdr.from);
      return null;
  }
  return null;
}

public void unsuspect(Address mbr) {
  boolean removed=mbr != null && removeSuspect(mbr);
  if(removed) {
    log.trace("member " + mbr + " was unsuspected");
    down_prot.down(new Event(Event.UNSUSPECT, mbr));
    up_prot.up(new Event(Event.UNSUSPECT, mbr));
  }
}

/**
 * Sends ARE_YOU_DEAD message to suspected_mbr, wait for return or timeout
 */
void verifySuspect(Address mbr) {
  Message msg;
  if(mbr == null) return;
  synchronized(suspects) {
    if(suspects.containsKey(mbr))
      return;
    suspects.put(mbr, new Long(System.currentTimeMillis()));
  }
  // moved out of synchronized statement (bela): http://jira.jboss.com/jira/browse/JGRP-302
  if(log.isTraceEnabled()) log.trace("verifying that " + mbr + " is dead");
  for(int i=0; i < num_msgs; i++) {
    msg=new Message(mbr, null, null);
    msg.setFlag(Message.OOB);
    msg.putHeader(name, new VerifyHeader(VerifyHeader.ARE_YOU_DEAD, local_addr));
    down_prot.down(new Event(Event.MSG, msg));
  }
  if(timer == null)
    startTimer();
}

protected synchronized void startTimer() {
  timer=getThreadFactory().newThread(this,"VERIFY_SUSPECT.TimerThread");
  timer.setDaemon(true);
  timer.start();
}

new FD_SOCK(),
new FD_ALL(),
new VERIFY_SUSPECT(),
new BARRIER(),
new NAKACK2(),

public synchronized void stop() {
  clearSuspects();
  running=false;
  if(timer != null && timer.isAlive()) {
    Thread tmp=timer;
    timer=null;
    tmp.interrupt();
  }
  timer=null;
}

public Object up(Message msg) {
  VerifyHeader hdr=msg.getHeader(this.id);
  if(hdr == null)
    return up_prot.up(msg);
  switch(hdr.type) {
    case VerifyHeader.ARE_YOU_DEAD:
      if(hdr.from == null) {
        log.error(Util.getMessage("AREYOUDEADHdrFromIsNull"));
        return null;
      }
      Address target=use_mcast_rsps? null : hdr.from;
      for(int i=0; i < num_msgs; i++) {
        Message rsp=new Message(target).setFlag(Message.Flag.INTERNAL)
         .putHeader(this.id, new VerifyHeader(VerifyHeader.I_AM_NOT_DEAD, local_addr));
        down_prot.down(rsp);
      }
      return null;
    case VerifyHeader.I_AM_NOT_DEAD:
      if(hdr.from == null) {
        log.error(Util.getMessage("IAMNOTDEADHdrFromIsNull"));
        return null;
      }
      unsuspect(hdr.from);
      return null;
  }
  return null;
}

public void unsuspect(Address mbr) {
  boolean removed=mbr != null && removeSuspect(mbr);
  if(removed) {
    log.trace("member " + mbr + " was unsuspected");
    down_prot.down(new Event(Event.UNSUSPECT, mbr));
    up_prot.up(new Event(Event.UNSUSPECT, mbr));
  }
}

protected synchronized void startTimer() {
  if(timer == null || !timer.isAlive()) {            
    timer=getThreadFactory().newThread(this,"VERIFY_SUSPECT.TimerThread");
    timer.setDaemon(true);
    timer.start();
  }
}

new FD_SOCK(),
new FD_ALL(),
new VERIFY_SUSPECT(),
new BARRIER(),
new NAKACK2(),

/**
 * Sends ARE_YOU_DEAD message to suspected_mbr, wait for return or timeout
 */
void verifySuspect(Collection<Address> mbrs) {
  if(mbrs == null || mbrs.isEmpty())
    return;
  boolean added=addSuspects(mbrs);
  if(added) {
    startTimer(); // start timer before we send out are you dead messages
    log.trace("verifying that %s %s dead", mbrs, mbrs.size() == 1? "is" : "are");
  }
  for(Address mbr: mbrs) {
    for(int i=0; i < num_msgs; i++) {
      Message msg=new Message(mbr).setFlag(Message.Flag.INTERNAL)
       .putHeader(this.id, new VerifyHeader(VerifyHeader.ARE_YOU_DEAD, local_addr));
      down_prot.down(msg);
    }
  }
}

public Object up(Event evt) {
  switch(evt.getType()) {
    case Event.SUSPECT:  // it all starts here ...
      // todo: change to collections in 4.1
      Collection<Address> s=evt.arg() instanceof Address? Collections.singletonList(evt.arg()) : evt.arg();
      if(s == null)
        return null;
      s.remove(local_addr); // ignoring suspect of self
      if(!use_icmp)
        verifySuspect(s);
      else
        s.forEach(this::verifySuspectWithICMP);
      return null;  // don't pass up; we will decide later (after verification) whether to pass it up
    case Event.CONFIG:
      if(bind_addr == null) {
        Map<String,Object> config=evt.getArg();
        bind_addr=(InetAddress)config.get("bind_addr");
      }
  }
  return up_prot.up(evt);
}

void verifySuspectWithICMP(Address suspected_mbr) {
  InetAddress host=suspected_mbr instanceof IpAddress? ((IpAddress)suspected_mbr).getIpAddress() : null;
  if(host == null)
    throw new IllegalArgumentException("suspected_mbr is not of type IpAddress - FD_ICMP only works with these");
  try {
    if(log.isTraceEnabled())
      log.trace("pinging host " + suspected_mbr + " using interface " + intf);
    long start=System.currentTimeMillis(), stop;
    boolean rc=host.isReachable(intf, 0, (int)timeout);
    stop=System.currentTimeMillis();
    if(rc) // success
      log.trace("successfully received response from " + host + " (after " + (stop-start) + "ms)");
    else { // failure
      log.debug("failed pinging " + suspected_mbr + " after " + (stop-start) + "ms; passing up SUSPECT event");
      removeSuspect(suspected_mbr);
      up_prot.up(new Event(Event.SUSPECT, Collections.singletonList(suspected_mbr)));
    }
  }
  catch(Exception ex) {
    log.error(Util.getMessage("FailedPinging"),suspected_mbr, ex);
  }
}

public Object down(Event evt) {
  switch(evt.getType()) {
    case Event.SET_LOCAL_ADDRESS:
      local_addr=evt.getArg();
      break;
    case Event.VIEW_CHANGE:
      View v=evt.getArg();
      adjustSuspectedMembers(v.getMembers());
      break;
  }
  return down_prot.down(evt);
}

Javadoc

Catches SUSPECT events traveling up the stack. Verifies that the suspected member is really dead. If yes, passes SUSPECT event up the stack, otherwise discards it. Has to be placed somewhere above the FD layer and below the GMS layer (receiver of the SUSPECT event). Note that SUSPECT events may be reordered by this protocol.

Most used methods

startTimer
unsuspect
verifySuspect
Sends ARE_YOU_DEAD message to suspected_mbr, wait for return or timeout
<init>
addSuspects
adjustSuspectedMembers
Removes all elements from suspects that are not in the new membership
getThreadFactory
removeSuspect
clearSuspects
getCurrentTimeMillis
verifySuspectWithICMP

verifySuspectWithICMP

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How to useVERIFY_SUSPECT in org.jgroups.protocols

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