| package org.onlab.onos.store.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; |
| |
| /** |
| * A Timestamp that derives its value from the prevailing |
| * wallclock time on the controller where it is generated. |
| */ |
| public class WallClockTimestamp implements Timestamp { |
| |
| private final long unixTimestamp; |
| |
| public WallClockTimestamp() { |
| unixTimestamp = System.currentTimeMillis(); |
| } |
| |
| @Override |
| public int compareTo(Timestamp o) { |
| checkArgument(o instanceof WallClockTimestamp, |
| "Must be WallClockTimestamp", o); |
| WallClockTimestamp that = (WallClockTimestamp) o; |
| |
| return ComparisonChain.start() |
| .compare(this.unixTimestamp, that.unixTimestamp) |
| .result(); |
| } |
| @Override |
| public int hashCode() { |
| return Objects.hash(unixTimestamp); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (!(obj instanceof WallClockTimestamp)) { |
| return false; |
| } |
| WallClockTimestamp that = (WallClockTimestamp) obj; |
| return Objects.equals(this.unixTimestamp, that.unixTimestamp); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("unixTimestamp", unixTimestamp) |
| .toString(); |
| } |
| |
| /** |
| * Returns the unixTimestamp. |
| * |
| * @return unix timestamp |
| */ |
| public long unixTimestamp() { |
| return unixTimestamp; |
| } |
| } |