org.jgroups.protocols.pbcast.STATE_TRANSFER java code examples

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}

public void handle(Address state_requester) {
  handleStateReq(state_requester);
}

public Object up(Message msg) {
  StateHeader hdr=msg.getHeader(this.id);
  if(hdr == null)
    return up_prot.up(msg);
  switch(hdr.type) {
    case StateHeader.STATE_REQ:
      state_requesters.add(msg.getSrc());
      break;
    case StateHeader.STATE_RSP:
      handleStateRsp(hdr.getDigest(), msg.getSrc(), msg.getBuffer());
      break;
    case StateHeader.STATE_EX:
      closeHoleFor(msg.getSrc());
      try {
        handleException(Util.exceptionFromBuffer(msg.getRawBuffer(), msg.getOffset(), msg.getLength()));
      }
      catch(Throwable t) {
        log.error("failed deserializaing state exception", t);
      }
      break;
    default:
      log.error("%s: type %s not known in StateHeader", local_addr, hdr.type);
      break;
  }
  return null;
}

public Object up(Event evt) {
  switch(evt.getType()) {
    case Event.TMP_VIEW:
    case Event.VIEW_CHANGE:
      handleViewChange(evt.getArg());
      break;
    case Event.CONFIG:
      Map<String,Object> config=evt.getArg();
      if(config != null && config.containsKey("state_transfer"))
        log.error(Util.getMessage("ProtocolStackCannotContainTwoStateTransferProtocolsRemoveEitherOneOfThem"));
      break;
  }
  return up_prot.up(evt);
}

if(isDigestNeeded()) {
  try {
    punchHoleFor(requester);
    closeBarrierAndSuspendStable();
    digest=(Digest)down_prot.down(Event.GET_DIGEST_EVT);
    sendException(requester, t);
    resumeStable();
    closeHoleFor(requester);
    return;
    openBarrier();
  getStateFromApplication(requester, digest);
  sendException(requester, t);
  if(isDigestNeeded()) {
    closeHoleFor(requester);
    resumeStable();

protected void handleException(Throwable exception) {
  if(isDigestNeeded())
    openBarrierAndResumeStable();
  up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(exception)));
}

/** Set the digest and the send the state up to the application */
protected void handleStateRsp(final Digest digest, Address sender, byte[] state) {
  try {
    if(isDigestNeeded()) {
      punchHoleFor(sender);
      closeBarrierAndSuspendStable(); // fix for https://jira.jboss.org/jira/browse/JGRP-1013
      if(digest != null)
        down_prot.down(new Event(Event.OVERWRITE_DIGEST, digest)); // set the digest (e.g. in NAKACK)
    }
    waiting_for_state_response=false;
    stop=System.currentTimeMillis();
    log.debug("%s: received state, size=%s, time=%d milliseconds", local_addr,
         (state == null? "0" : Util.printBytes(state.length)), stop - start);
    StateTransferResult result=new StateTransferResult(state);
    up_prot.up(new Event(Event.GET_STATE_OK, result));
    down_prot.down(new Event(Event.GET_VIEW_FROM_COORD)); // https://issues.jboss.org/browse/JGRP-1751
  }
  catch(Throwable t) {
    handleException(t);
  }
  finally {
    if(isDigestNeeded()) {
      closeHoleFor(sender);
      openBarrierAndResumeStable();
    }
  }
}

  handleStateReq(hdr);
  break;
case StateHeader.STATE_RSP:
  handleStateRsp(hdr, msg.getBuffer());
  if(flushProtocolInStack) {
    up_prot.up(new Event(Event.RESUME));
handleViewChange((View)evt.getArg());
break;

handleViewChange(evt.getArg());
break;
StateTransferInfo info=evt.getArg();
if(info.target == null) {
  target=determineCoordinator();

public void openBarrier() {
  if(!isDigestNeeded())
    return;
  log.trace("%s: sending down OPEN_BARRIER", local_addr);
  down_prot.down(new Event(Event.OPEN_BARRIER));
}

protected void sendException(Address requester, Throwable exception) {
  try {
    Message ex_msg=new Message(requester).setBuffer(Util.exceptionToBuffer(exception))
     .putHeader(getId(), new StateHeader(StateHeader.STATE_EX));
    down(ex_msg);
  }
  catch(Throwable t) {
    log.error("%s: failed sending exception %s to %s", local_addr, exception, requester);
  }
}

if(!isDigestNeeded()) { // state transfer is in progress, digest was already requested
  requestApplicationStates(sender, false);
    log.debug("digest is " + digest + ", getting application state");
  try {
    requestApplicationStates(sender, !flushProtocolInStack);

private void handleViewChange(View v) {
  Address old_coord;
  Vector new_members=v.getMembers();
  boolean send_up_null_state_rsp=false;
  synchronized(members) {
    old_coord=(Address)(!members.isEmpty()? members.firstElement() : null);
    members.clear();
    members.addAll(new_members);
    // this handles the case where a coord dies during a state transfer; prevents clients from hanging forever
    // Note this only takes a coordinator crash into account, a getState(target, timeout), where target is not
    // null is not handled ! (Usually we get the state from the coordinator)
    // http://jira.jboss.com/jira/browse/JGRP-148
    if(waiting_for_state_response && old_coord != null && !members.contains(old_coord)) {
      send_up_null_state_rsp=true;
    }
  }
  if(send_up_null_state_rsp) {
    if(log.isWarnEnabled())
      log.warn("discovered that the state provider (" + old_coord + ") crashed; will return null state to application");
    StateHeader hdr=new StateHeader(StateHeader.STATE_RSP, local_addr, 0, null, null);
    handleStateRsp(hdr, null); // sends up null GET_STATE_OK
  }
}

if(isDigestNeeded()) {
  try {
    punchHoleFor(requester);
    closeBarrierAndSuspendStable();
    digest=(Digest)down_prot.down(Event.GET_DIGEST_EVT);
    sendException(requester, t);
    resumeStable();
    closeHoleFor(requester);
    return;
    openBarrier();
  getStateFromApplication(requester, digest);
  sendException(requester, t);
  if(isDigestNeeded()) {
    closeHoleFor(requester);
    resumeStable();

/** Set the digest and the send the state up to the application */
protected void handleStateRsp(final Digest digest, Address sender, byte[] state) {
  try {
    if(isDigestNeeded()) {
      punchHoleFor(sender);
      closeBarrierAndSuspendStable(); // fix for https://jira.jboss.org/jira/browse/JGRP-1013
      if(digest != null)
        down_prot.down(new Event(Event.OVERWRITE_DIGEST, digest)); // set the digest (e.g. in NAKACK)
    }
    waiting_for_state_response=false;
    stop=System.currentTimeMillis();
    log.debug("%s: received state, size=%s, time=%d milliseconds", local_addr,
         (state == null? "0" : Util.printBytes(state.length)), stop - start);
    StateTransferResult result=new StateTransferResult(state);
    up_prot.up(new Event(Event.GET_STATE_OK, result));
    down_prot.down(new Event(Event.GET_VIEW_FROM_COORD)); // https://issues.jboss.org/browse/JGRP-1751
  }
  catch(Throwable t) {
    handleException(t);
  }
  finally {
    if(isDigestNeeded()) {
      closeHoleFor(sender);
      openBarrierAndResumeStable();
    }
  }
}

handleViewChange((View)evt.getArg());
break;
StateTransferInfo info=(StateTransferInfo)evt.getArg();
if(info.target == null) {
  target=determineCoordinator();

@ManagedOperation(description="Opens BARRIER and resumes STABLE")
public void openBarrierAndResumeStable() {
  if(!isDigestNeeded())
    return;
  log.trace("%s: sending down OPEN_BARRIER and RESUME_STABLE", local_addr);
  down_prot.down(new Event(Event.OPEN_BARRIER));
  down_prot.down(new Event(Event.RESUME_STABLE));
}

protected void handleException(Throwable exception) {
  if(isDigestNeeded())
    openBarrierAndResumeStable();
  up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(exception)));
}

protected void sendException(Address requester, Throwable exception) {
  try {
    Message ex_msg=new Message(requester).setBuffer(Util.exceptionToBuffer(exception))
     .putHeader(getId(), new StateHeader(StateHeader.STATE_EX));
    down(ex_msg);
  }
  catch(Throwable t) {
    log.error("%s: failed sending exception %s to %s", local_addr, exception, requester);
  }
}

handleViewChange(evt.getArg());
break;
StateTransferInfo info=evt.getArg();
if(info.target == null) {
  target=determineCoordinator();

public Object up(Message msg) {
  StateHeader hdr=msg.getHeader(this.id);
  if(hdr == null)
    return up_prot.up(msg);
  switch(hdr.type) {
    case StateHeader.STATE_REQ:
      state_requesters.add(msg.getSrc());
      break;
    case StateHeader.STATE_RSP:
      handleStateRsp(hdr.getDigest(), msg.getSrc(), msg.getBuffer());
      break;
    case StateHeader.STATE_EX:
      closeHoleFor(msg.getSrc());
      try {
        handleException(Util.exceptionFromBuffer(msg.getRawBuffer(), msg.getOffset(), msg.getLength()));
      }
      catch(Throwable t) {
        log.error("failed deserializaing state exception", t);
      }
      break;
    default:
      log.error("%s: type %s not known in StateHeader", local_addr, hdr.type);
      break;
  }
  return null;
}

Javadoc

STATE_TRANSFER protocol based on byte array transfer. A state request is sent to a chosen member (coordinator if null). That member makes a copy D of its current digest and asks the application for a copy of its current state S. Then the member returns both S and D to the requester. The requester first sets its digest to D and then returns the state to the application.

Most used methods

determineCoordinator
Return the first element of members which is not me. Otherwise return null.
handleStateReq
If a state transfer is in progress, we don't need to send a GET_APPLSTATE event to the application,
handleStateRsp
Set the digest and the send the state up to the application
handleViewChange
isDigestNeeded
When FLUSH is used we do not need to pass digests between members see JGroups/doc/design/PartialStat
closeBarrierAndSuspendStable
closeHoleFor
down
getId
getStateFromApplication
handleException
openBarrier

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How to useSTATE_TRANSFER in org.jgroups.protocols.pbcast

Best Java code snippets using org.jgroups.protocols.pbcast.STATE_TRANSFER (Showing top 20 results out of 315)

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