Added a LogicalClockService for ordering arbitrary events in the cluster. Updated couple of areas that are currently vulnerable to clock skew
Change-Id: I14548ecb3c783104de8d72cbb5eb21de6ece08ed
diff --git a/core/store/dist/src/main/java/org/onosproject/store/impl/LogicalTimestamp.java b/core/store/dist/src/main/java/org/onosproject/store/impl/LogicalTimestamp.java
new file mode 100644
index 0000000..5ae8b4f
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/impl/LogicalTimestamp.java
@@ -0,0 +1,68 @@
+package org.onosproject.store.impl;
+
+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;
+
+/**
+ * Timestamp based on logical sequence value.
+ * <p>
+ * LogicalTimestamps are ordered by their sequence values.
+ */
+public class LogicalTimestamp implements Timestamp {
+
+ private final long value;
+
+ public LogicalTimestamp(long value) {
+ this.value = value;
+ }
+
+ @Override
+ public int compareTo(Timestamp o) {
+ checkArgument(o instanceof LogicalTimestamp,
+ "Must be LogicalTimestamp", o);
+ LogicalTimestamp that = (LogicalTimestamp) o;
+
+ return ComparisonChain.start()
+ .compare(this.value, that.value)
+ .result();
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(value);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (!(obj instanceof LogicalTimestamp)) {
+ return false;
+ }
+ LogicalTimestamp that = (LogicalTimestamp) obj;
+ return Objects.equals(this.value, that.value);
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .add("value", value)
+ .toString();
+ }
+
+ /**
+ * Returns the sequence value.
+ *
+ * @return sequence value
+ */
+ public long value() {
+ return this.value;
+ }
+}