/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.clustering.infinispan.subsystem;
import org.jboss.dmr.ModelNode;
/**
* Convert the 1.4 SEGMENTS value to VIRTUAL_NODES in model and operations, if defined and not an expression
*
* @author <a href="mailto:tomaz.cerar@redhat.com">Tomaz Cerar</a>
* @author Richard Achmatowicz (c) RedHat 2013
*/
public class SegmentsAndVirtualNodeConverter {
// ratio of segments to virtual nodes to convert between the two
public static final int SEGMENTS_PER_VIRTUAL_NODE = 6;
public static final int VIRTUAL_NODES_DEFAULT = 1;
public static final int SEGMENTS_DEFAULT = DistributedCacheResourceDefinition.Attribute.SEGMENTS.getDefinition().getDefaultValue().asInt();
/*
* Convert a 1.3 virtual nodes value to a 1.4 segments value
*/
public static int virtualNodesToSegments(int virtualNodes) {
return virtualNodes * SEGMENTS_PER_VIRTUAL_NODE;
}
/*
* Convert a 1.4 segments value to a 1.3 virtual nodes value
*/
public static int segmentsToVirtualNodes(int segments) {
// divide by zero should not occur as segments is required to be > 0
return segments / SEGMENTS_PER_VIRTUAL_NODE;
}
/*
* Helper methods
*/
public static String virtualNodesToSegments(String virtualNodesValue) {
int segments = SEGMENTS_DEFAULT;
try {
segments = virtualNodesToSegments(Integer.parseInt(virtualNodesValue));
}
catch(NumberFormatException nfe) {
// in case of expression
}
return Integer.toString(segments);
}
public static String segmentsToVirtualNodes(String segmentsValue) {
int virtualNodes = VIRTUAL_NODES_DEFAULT;
try {
virtualNodes = segmentsToVirtualNodes(Integer.parseInt(segmentsValue));
}
catch(NumberFormatException nfe) {
// in case of expression
}
return Integer.toString(virtualNodes);
}
public static ModelNode virtualNodesToSegments(ModelNode virtualNodes) {
int segments = SEGMENTS_DEFAULT;
if (virtualNodes.isDefined()) {
segments = virtualNodesToSegments(virtualNodes.asInt());
}
return new ModelNode(segments);
}
public static ModelNode segmentsToVirtualNodes(ModelNode segments) {
int virtualNodes = VIRTUAL_NODES_DEFAULT;
if (segments.isDefined()) {
virtualNodes = segmentsToVirtualNodes(segments.asInt());
}
return new ModelNode(virtualNodes);
}
}