/**
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;
import java.io.Serializable;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.UUID;
import com.bigdata.quorum.Quorum;
/**
* Helper class finds all joined and non-joined services for the quorum
* client.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan
* Thompson</a>
*/
public class JoinedAndNonJoinedServices implements Serializable,
IJoinedAndNonJoinedServices {
/**
*
*/
private static final long serialVersionUID = 1L;
// The services joined with the met quorum, in their join order.
private final UUID[] joinedServiceIds;
// The services in the write pipeline (in any order).
private final Set<UUID> nonJoinedPipelineServiceIds;
public JoinedAndNonJoinedServices(
final Quorum<HAGlue, QuorumService<HAGlue>> quorum) {
// The services joined with the met quorum, in their join order.
joinedServiceIds = quorum.getJoined();
// The UUID for this service.
final UUID serviceId = quorum.getClient().getServiceId();
if (joinedServiceIds.length == 0
|| !joinedServiceIds[0].equals(serviceId)) {
/*
* Sanity check. Verify that the first service in the join order
* is *this* service. This is a precondition for the service to
* be the leader.
*/
throw new RuntimeException("Not leader: serviceId=" + serviceId
+ ", joinedServiceIds="
+ Arrays.toString(joinedServiceIds));
}
// The services in the write pipeline (in any order).
nonJoinedPipelineServiceIds = new LinkedHashSet<UUID>(
Arrays.asList(quorum.getPipeline()));
// Remove all services that are joined from this collection.
for (UUID joinedServiceId : joinedServiceIds) {
nonJoinedPipelineServiceIds.remove(joinedServiceId);
}
}
@Override
public UUID[] getJoinedServiceIds() {
return joinedServiceIds;
}
@Override
public Set<UUID> getNonJoinedPipelineServiceIds() {
return nonJoinedPipelineServiceIds;
}
@Override
public String toString() {
return super.toString() + "{#joined=" + joinedServiceIds.length
+ ", #nonJoined=" + nonJoinedPipelineServiceIds.size()
+ ", joinedServices=" + Arrays.toString(joinedServiceIds)
+ ", nonJoined=" + nonJoinedPipelineServiceIds + "}";
}
}