| /* |
| * Copyright 2014-present Open Networking Foundation |
| * |
| * 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 constructor for serialization. |
| */ |
| protected MastershipBasedTimestamp() { |
| this.termNumber = -1; |
| this.sequenceNumber = -1; |
| } |
| |
| /** |
| * 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; |
| } |
| |
| } |