/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.ha.pipeline;
import java.util.UUID;
/**
* Exception thrown when there is a problem with write replication from a
* service to its downstream service, including a problem with RMI to the
* downstream service or socket level write replication to the downstream
* service. This typed exception enables the leader is then able to take action
* intended to cure the pipeline by forcing the problem service from the quorum.
* The problem service can then attempt to re-enter the quorum.
*/
public class PipelineImmediateDownstreamReplicationException extends
AbstractPipelineException {
/**
* Generated ID
*/
private static final long serialVersionUID = 8019938954269914574L;
/**
* The {@link UUID} of the service reporting a problem replicating writes to
* its downstream service.
*/
private final UUID serviceId;
/**
* The prior and next service {@link UUID}s for the service reporting the
* problem. The problem is with the communication to the "next" service.
*/
private final UUID[] priorAndNext;
/**
*
* @param serviceId
* The {@link UUID} of the service reporting a problem
* replicating writes to its downstream service.
* @param priorAndNext
* The prior and next service {@link UUID}s for the service
* reporting the problem. The problem is with the communication
* to the "next" service.
* @param t
* The root cause exception.
*/
public PipelineImmediateDownstreamReplicationException(final UUID serviceId,
final UUID[] priorAndNext, final Throwable t) {
super(t);
this.serviceId = serviceId;
this.priorAndNext = priorAndNext;
}
/**
* Return the {@link UUID} of the service reporting the problem. This is the
* service that attempted to replicate a payload to the downstream service
* and was unable to replicate the payload due to the reported root cause.
*/
public UUID getReportingServiceId() {
return serviceId;
}
/**
* The prior and next service {@link UUID}s for the service reporting the
* problem. The problem is with the communication to the "next" service.
*/
public UUID[] getPriorAndNext() {
return priorAndNext;
}
/**
* Return the {@link UUID} of the downstream service - the problem is
* reported for the communication channel between the reporting service and
* this downstream service. The downstream service is the service that
* should be forced out of the quorum in order to "fix" the pipeline.
*/
public UUID getProblemServiceId() {
return priorAndNext[1];
}
}