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/core/impl/LogicalClockManager.java b/core/store/dist/src/main/java/org/onosproject/store/core/impl/LogicalClockManager.java
new file mode 100644
index 0000000..69a50f0
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/core/impl/LogicalClockManager.java
@@ -0,0 +1,51 @@
+package org.onosproject.store.core.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.store.Timestamp;
+import org.onosproject.store.impl.LogicalTimestamp;
+import org.onosproject.store.service.AtomicCounter;
+import org.onosproject.store.service.LogicalClockService;
+import org.onosproject.store.service.StorageService;
+import org.slf4j.Logger;
+
+/**
+ * LogicalClockService implementation based on a AtomicCounter.
+ */
+@Component(immediate = true, enabled = true)
+@Service
+public class LogicalClockManager implements LogicalClockService {
+
+ private final Logger log = getLogger(getClass());
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected StorageService storageService;
+
+ private static final String SYSTEM_LOGICAL_CLOCK_COUNTER_NAME = "sys-clock-counter";
+ private AtomicCounter atomicCounter;
+
+ @Activate
+ public void activate() {
+ atomicCounter = storageService.atomicCounterBuilder()
+ .withName(SYSTEM_LOGICAL_CLOCK_COUNTER_NAME)
+ .withPartitionsDisabled()
+ .build();
+ log.info("Started.");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ log.info("Stopped.");
+ }
+
+ @Override
+ public Timestamp getTimestamp() {
+ return new LogicalTimestamp(atomicCounter.incrementAndGet());
+ }
+}
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