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/*
* Copyright 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.ecmap;
import org.onosproject.store.Timestamp;
import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
/**
* Representation of a value in EventuallyConsistentMap.
*
* @param <V> value type
*/
public class MapValue<V> implements Comparable<MapValue<V>> {
private final Timestamp timestamp;
private final V value;
/**
* Creates a tombstone value with the specified timestamp.
* @param timestamp timestamp for tombstone
* @return tombstone MapValue
*
* @param <U> value type
*/
public static <U> MapValue<U> tombstone(Timestamp timestamp) {
return new MapValue<>(null, timestamp);
}
public MapValue(V value, Timestamp timestamp) {
this.value = value;
this.timestamp = timestamp;
}
public boolean isTombstone() {
return value == null;
}
public boolean isAlive() {
return value != null;
}
public Timestamp timestamp() {
return timestamp;
}
public V get() {
return value;
}
@Override
public int compareTo(MapValue<V> o) {
return this.timestamp.compareTo(o.timestamp);
}
public boolean isNewerThan(MapValue<V> other) {
return timestamp.isNewerThan(other.timestamp);
}
public boolean isNewerThan(Timestamp timestamp) {
return this.timestamp.isNewerThan(timestamp);
}
public Digest digest() {
return new Digest(timestamp, isTombstone());
}
@Override
public int hashCode() {
return Objects.hashCode(timestamp, value);
}
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object other) {
if (other instanceof MapValue) {
MapValue<V> that = (MapValue<V>) other;
return Objects.equal(this.timestamp, that.timestamp) &&
Objects.equal(this.value, that.value);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("timestamp", timestamp)
.add("value", value)
.toString();
}
@SuppressWarnings("unused")
private MapValue() {
this.timestamp = null;
this.value = null;
}
/**
* Digest or summary of a MapValue for use during Anti-Entropy exchanges.
*/
public static class Digest {
private final Timestamp timestamp;
private final boolean isTombstone;
public Digest(Timestamp timestamp, boolean isTombstone) {
this.timestamp = timestamp;
this.isTombstone = isTombstone;
}
public Timestamp timestamp() {
return timestamp;
}
public boolean isTombstone() {
return isTombstone;
}
public boolean isNewerThan(Digest other) {
return timestamp.isNewerThan(other.timestamp);
}
@Override
public int hashCode() {
return Objects.hashCode(timestamp, isTombstone);
}
@Override
public boolean equals(Object other) {
if (other instanceof Digest) {
Digest that = (Digest) other;
return Objects.equal(this.timestamp, that.timestamp) &&
Objects.equal(this.isTombstone, that.isTombstone);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("timestamp", timestamp)
.add("isTombstone", isTombstone)
.toString();
}
}
}
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