Refactor flow rule store to resolve missing flows with old masters following mastership reassignment
Change-Id: I7b7e639c84cbd23fe9ab1f12080f865cdfc7f7f9
diff --git a/core/store/dist/src/main/java/org/onosproject/store/flow/impl/LogicalClock.java b/core/store/dist/src/main/java/org/onosproject/store/flow/impl/LogicalClock.java
new file mode 100644
index 0000000..92d39cf
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/flow/impl/LogicalClock.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.flow.impl;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+import org.onosproject.store.LogicalTimestamp;
+
+/**
+ * Logical clock.
+ */
+public final class LogicalClock {
+ private final AtomicLong timestamp = new AtomicLong();
+
+ /**
+ * Records an event.
+ *
+ * @param timestamp the event timestamp
+ */
+ public void tick(LogicalTimestamp timestamp) {
+ this.timestamp.accumulateAndGet(timestamp.value(), (x, y) -> Math.max(x, y) + 1);
+ }
+
+ /**
+ * Returns a timestamped value.
+ *
+ * @param value the value to timestamp
+ * @param <T> the value type
+ * @return the timestamped value
+ */
+ public <T> Timestamped<T> timestamp(T value) {
+ return new Timestamped<>(value, getTimestamp());
+ }
+
+ /**
+ * Increments and returns the current timestamp.
+ *
+ * @return the current timestamp
+ */
+ public LogicalTimestamp getTimestamp() {
+ return new LogicalTimestamp(timestamp.incrementAndGet());
+ }
+}