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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.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 Objects.hash(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
}
}
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