CLI command to display the value of a atomic counter

Change-Id: Ib37ea4d4949dc40a43ddea1b071692783751a101

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.cli.net;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.store.service.AtomicCounter;
+import org.onosproject.store.service.StorageService;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+/**
+ * Command to display the current value of a atomic counter.
+ */
+@Command(scope = "onos", name = "counter",
+        description = "Displays the current value of a atomic counter")
+public class CounterCommand extends AbstractShellCommand {
+
+    @Argument(index = 0, name = "counterName", description = "Counter Name",
+            required = true, multiValued = false)
+    String name = null;
+
+    @Override
+    protected void execute() {
+        StorageService storageService = get(StorageService.class);
+        AtomicCounter counter = storageService.getAtomicCounter(name);
+
+        if (outputJson()) {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode counterJsonNode = mapper.createObjectNode();
+            counterJsonNode.put("value", counter.get());
+            print("%s", counterJsonNode);
+        } else {
+            print("%d", counter.get());
+        }
+    }
+}

@@ -396,6 +396,9 @@
             <action class="org.onosproject.cli.net.TransactionsCommand"/>
         </command>
         <command>
+            <action class="org.onosproject.cli.net.CounterCommand"/>
+        </command>
+        <command>
             <action class="org.onosproject.cli.net.ClusterDevicesCommand"/>
             <completers>
                 <ref component-id="clusterIdCompleter"/>