[ONOS-6874] Implement nullable ConsistentMap

Change-Id: I82a232d376b230b06977b24f12364aa374c9c113
diff --git a/core/store/primitives/src/test/java/org/onosproject/store/primitives/impl/NotNullConsistentMapTest.java b/core/store/primitives/src/test/java/org/onosproject/store/primitives/impl/NotNullConsistentMapTest.java
new file mode 100644
index 0000000..9c9e55d
--- /dev/null
+++ b/core/store/primitives/src/test/java/org/onosproject/store/primitives/impl/NotNullConsistentMapTest.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017-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.primitives.impl;
+
+import java.util.Arrays;
+
+import io.atomix.protocols.raft.proxy.RaftProxy;
+import io.atomix.protocols.raft.service.RaftService;
+import org.junit.Test;
+import org.onlab.util.Tools;
+import org.onosproject.store.primitives.resources.impl.AtomixConsistentMap;
+import org.onosproject.store.primitives.resources.impl.AtomixConsistentMapService;
+import org.onosproject.store.primitives.resources.impl.AtomixTestBase;
+import org.onosproject.store.service.AsyncConsistentMap;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Unit tests for {@link AtomixConsistentMap}.
+ */
+public class NotNullConsistentMapTest extends AtomixTestBase<AtomixConsistentMap> {
+
+    @Override
+    protected RaftService createService() {
+        return new AtomixConsistentMapService();
+    }
+
+    @Override
+    protected AtomixConsistentMap createPrimitive(RaftProxy proxy) {
+        return new AtomixConsistentMap(proxy);
+    }
+
+    /**
+     * Tests not null values.
+     */
+    @Test
+    public void testNotNullValues() throws Throwable {
+        final byte[] rawFooValue = Tools.getBytesUtf8("Hello foo!");
+        final byte[] rawBarValue = Tools.getBytesUtf8("Hello bar!");
+
+        AsyncConsistentMap<String, byte[]> map =
+                DistributedPrimitives.newNotNullMap(newPrimitive("testNotNullValues"));
+
+        map.get("foo")
+                .thenAccept(v -> assertNull(v)).join();
+        map.put("foo", null)
+                .thenAccept(v -> assertNull(v)).join();
+        map.put("foo", rawFooValue).thenAccept(v -> assertNull(v)).join();
+        map.get("foo").thenAccept(v -> {
+            assertNotNull(v);
+            assertTrue(Arrays.equals(v.value(), rawFooValue));
+        }).join();
+        map.put("foo", null).thenAccept(v -> {
+            assertNotNull(v);
+            assertTrue(Arrays.equals(v.value(), rawFooValue));
+        }).join();
+        map.get("foo").thenAccept(v -> assertNull(v)).join();
+        map.replace("foo", rawFooValue, null)
+                .thenAccept(replaced -> assertFalse(replaced)).join();
+        map.replace("foo", null, rawBarValue)
+                .thenAccept(replaced -> assertTrue(replaced)).join();
+        map.get("foo").thenAccept(v -> {
+            assertNotNull(v);
+            assertTrue(Arrays.equals(v.value(), rawBarValue));
+        }).join();
+        map.replace("foo", rawBarValue, null)
+                .thenAccept(replaced -> assertTrue(replaced)).join();
+        map.get("foo").thenAccept(v -> assertNull(v)).join();
+    }
+}