| package org.onlab.onos.store.common.impl; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| import java.util.Objects; |
| |
| import org.onlab.onos.store.Timestamp; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.collect.ComparisonChain; |
| |
| /** |
| * Default implementation of Timestamp. |
| * TODO: Better documentation. |
| */ |
| public final class MastershipBasedTimestamp implements Timestamp { |
| |
| private final int termNumber; |
| private final int sequenceNumber; |
| |
| /** |
| * Default version tuple. |
| * |
| * @param termNumber the mastership termNumber |
| * @param sequenceNumber the sequenceNumber number within the termNumber |
| */ |
| public MastershipBasedTimestamp(int termNumber, int 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 int termNumber() { |
| return termNumber; |
| } |
| |
| /** |
| * Returns the sequenceNumber number. |
| * |
| * @return sequenceNumber |
| */ |
| public int sequenceNumber() { |
| return sequenceNumber; |
| } |
| |
| // Default constructor for serialization |
| @Deprecated |
| protected MastershipBasedTimestamp() { |
| this.termNumber = -1; |
| this.sequenceNumber = -1; |
| } |
| } |