/*
* Copyright 2008-2009 LinkedIn, Inc
* Copyright 2013 Big Switch Networks, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.sdnplatform.sync.internal.version;
import java.io.Serializable;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
/**
* An entry element for a vector clock versioning scheme This assigns the
* version from a specific machine, the VectorClock keeps track of the complete
* system version, which will consist of many individual Version objects.
*
*
*/
public final class ClockEntry
implements Cloneable, Serializable {
private static final long serialVersionUID = -759862327985468981L;
private final short nodeId;
private final long version;
/**
* Create a new Version from constituate parts
*
* @param nodeId The node id
* @param version The current version
*/
@JsonCreator
public ClockEntry(@JsonProperty("nodeId") short nodeId,
@JsonProperty("version") long version) {
if(nodeId < 0)
throw new IllegalArgumentException("Node id " + nodeId + " is not in the range (0, "
+ Short.MAX_VALUE + ").");
if(version < 1)
throw new IllegalArgumentException("Version " + version + " is not in the range (1, "
+ Short.MAX_VALUE + ").");
this.nodeId = nodeId;
this.version = version;
}
@Override
public ClockEntry clone() {
try {
return (ClockEntry) super.clone();
} catch(CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
public short getNodeId() {
return nodeId;
}
public long getVersion() {
return version;
}
public ClockEntry incremented() {
return new ClockEntry(nodeId, version + 1);
}
@Override
public int hashCode() {
return nodeId + (((int) version) << 16);
}
@Override
public boolean equals(Object o) {
if(this == o)
return true;
if(o == null)
return false;
if(o.getClass().equals(ClockEntry.class)) {
ClockEntry v = (ClockEntry) o;
return v.getNodeId() == getNodeId() && v.getVersion() == getVersion();
} else {
return false;
}
}
@Override
public String toString() {
return nodeId + ":" + version;
}
}