Moved generic Timestamp/ClockManager classes to onos-api
so they are usable by applications.
Change-Id: Icf0e92d12434dec782332e91b632da8066a85b60
diff --git a/core/api/src/main/java/org/onosproject/store/service/WallClockTimestamp.java b/core/api/src/main/java/org/onosproject/store/service/WallClockTimestamp.java
new file mode 100644
index 0000000..0cc7b45
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/store/service/WallClockTimestamp.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2014 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.service;
+
+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 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();
+ }
+
+ public WallClockTimestamp(long timestamp) {
+ unixTimestamp = timestamp;
+ }
+
+ @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;
+ }
+}