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/*
* Copyright 2014-2015 Open Networking Laboratory
*
* 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.onosproject.store.impl;
import static com.google.common.base.Preconditions.checkArgument;
import java.util.Objects;
import org.onosproject.store.Timestamp;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ComparisonChain;
/**
* A logical timestamp that derives its value from two things:
* <ul>
* <li> The current mastership term of the device.</li>
* <li> The value of the counter used for tracking topology events observed from
* the device during that current time of a device. </li>
* </ul>
*/
public final class MastershipBasedTimestamp implements Timestamp {
private final long termNumber;
private final long sequenceNumber;
/**
* Default version tuple.
*
* @param termNumber the mastership termNumber
* @param sequenceNumber the sequenceNumber number within the termNumber
*/
public MastershipBasedTimestamp(long termNumber, long sequenceNumber) {
this.termNumber = termNumber;
this.sequenceNumber = sequenceNumber;
}
@Override
public int compareTo(Timestamp o) {
checkArgument(o instanceof MastershipBasedTimestamp,
"Must be MastershipBasedTimestamp", o);
MastershipBasedTimestamp that = (MastershipBasedTimestamp) o;
return ComparisonChain.start()
.compare(this.termNumber, that.termNumber)
.compare(this.sequenceNumber, that.sequenceNumber)
.result();
}
@Override
public int hashCode() {
return Objects.hash(termNumber, sequenceNumber);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof MastershipBasedTimestamp)) {
return false;
}
MastershipBasedTimestamp that = (MastershipBasedTimestamp) obj;
return Objects.equals(this.termNumber, that.termNumber) &&
Objects.equals(this.sequenceNumber, that.sequenceNumber);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("termNumber", termNumber)
.add("sequenceNumber", sequenceNumber)
.toString();
}
/**
* Returns the termNumber.
*
* @return termNumber
*/
public long termNumber() {
return termNumber;
}
/**
* Returns the sequenceNumber number.
*
* @return sequenceNumber
*/
public long sequenceNumber() {
return sequenceNumber;
}
// Default constructor for serialization
/**
* @deprecated in Cardinal Release
*/
@Deprecated
protected MastershipBasedTimestamp() {
this.termNumber = -1;
this.sequenceNumber = -1;
}
}
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