| /* |
| * Copyright 2015-present 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.trivial; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.collect.ComparisonChain; |
| import org.onosproject.store.Timestamp; |
| |
| import java.util.Objects; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| /** |
| * A Timestamp that derives its value from the system clock time (in ns) |
| * on the controller where it is generated. |
| */ |
| public class SystemClockTimestamp implements Timestamp { |
| |
| private final long nanoTimestamp; |
| |
| public SystemClockTimestamp() { |
| nanoTimestamp = System.nanoTime(); |
| } |
| |
| public SystemClockTimestamp(long timestamp) { |
| nanoTimestamp = timestamp; |
| } |
| |
| @Override |
| public int compareTo(Timestamp o) { |
| checkArgument(o instanceof SystemClockTimestamp, |
| "Must be SystemClockTimestamp", o); |
| SystemClockTimestamp that = (SystemClockTimestamp) o; |
| |
| return ComparisonChain.start() |
| .compare(this.nanoTimestamp, that.nanoTimestamp) |
| .result(); |
| } |
| @Override |
| public int hashCode() { |
| return Long.hashCode(nanoTimestamp); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (!(obj instanceof SystemClockTimestamp)) { |
| return false; |
| } |
| SystemClockTimestamp that = (SystemClockTimestamp) obj; |
| return Objects.equals(this.nanoTimestamp, that.nanoTimestamp); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("nanoTimestamp", nanoTimestamp) |
| .toString(); |
| } |
| |
| public long nanoTimestamp() { |
| return nanoTimestamp; |
| } |
| |
| public long systemTimestamp() { |
| return nanoTimestamp / 1_000_000; // convert ns to ms |
| } |
| } |