Refactoring to eliminate a split package issue in onos-core-primitives.

Change-Id: I48ff6fe62ae006906674aae1f69e015395f042fc
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixDistributedLock.java b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixDistributedLock.java
new file mode 100644
index 0000000..a4e0f27
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixDistributedLock.java
@@ -0,0 +1,63 @@
+/*
+ * 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.atomix.primitives.impl;
+
+import java.time.Duration;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+import org.onosproject.store.service.AsyncDistributedLock;
+import org.onosproject.store.service.Version;
+
+/**
+ * Atomix distributed lock.
+ */
+public class AtomixDistributedLock implements AsyncDistributedLock {
+    private final io.atomix.core.lock.AsyncAtomicLock atomixLock;
+
+    public AtomixDistributedLock(io.atomix.core.lock.AsyncAtomicLock atomixLock) {
+        this.atomixLock = atomixLock;
+    }
+
+    @Override
+    public String name() {
+        return atomixLock.name();
+    }
+
+    @Override
+    public CompletableFuture<Version> lock() {
+        return atomixLock.lock().thenApply(this::toVersion);
+    }
+
+    @Override
+    public CompletableFuture<Optional<Version>> tryLock() {
+        return atomixLock.tryLock().thenApply(optional -> optional.map(this::toVersion));
+    }
+
+    @Override
+    public CompletableFuture<Optional<Version>> tryLock(Duration timeout) {
+        return atomixLock.tryLock(timeout).thenApply(optional -> optional.map(this::toVersion));
+    }
+
+    @Override
+    public CompletableFuture<Void> unlock() {
+        return atomixLock.unlock();
+    }
+
+    private Version toVersion(io.atomix.utils.time.Version version) {
+        return new Version(version.value());
+    }
+}