Initial gNOI implementation added. Introduced system Time and Reboot RPC

Change-Id: I8accdcc6c1ff247408ce54490ceff3972fdf850f
diff --git a/drivers/gnoi/src/main/java/org/onosproject/drivers/gnoi/GnoiBasicSystemOperationsImpl.java b/drivers/gnoi/src/main/java/org/onosproject/drivers/gnoi/GnoiBasicSystemOperationsImpl.java
new file mode 100644
index 0000000..411a8bf
--- /dev/null
+++ b/drivers/gnoi/src/main/java/org/onosproject/drivers/gnoi/GnoiBasicSystemOperationsImpl.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2019-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.drivers.gnoi;
+
+import gnoi.system.SystemOuterClass.RebootRequest;
+import gnoi.system.SystemOuterClass.RebootResponse;
+import gnoi.system.SystemOuterClass.RebootMethod;
+import org.onosproject.net.behaviour.BasicSystemOperations;
+import java.util.concurrent.CompletableFuture;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Implementation of the BasicSystemOperations behavior for gNOI-enabled devices.
+ */
+public class GnoiBasicSystemOperationsImpl
+        extends AbstractGnoiHandlerBehaviour implements BasicSystemOperations {
+
+    private static final Logger log = LoggerFactory
+            .getLogger(GnoiBasicSystemOperationsImpl.class);
+
+    @Override
+    public CompletableFuture<Boolean> reboot() {
+        if (!setupBehaviour()) {
+            return CompletableFuture.completedFuture(false);
+        }
+
+        final RebootRequest.Builder requestMsg = RebootRequest.newBuilder().setMethod(RebootMethod.COLD);
+        final CompletableFuture<Boolean> future = client.reboot(requestMsg.build())
+                .handle((response, error) -> {
+                    if (error == null) {
+                        log.debug("gNOI reboot() for device {} returned {}", deviceId, response);
+                        return RebootResponse.getDefaultInstance().equals(response);
+                    } else {
+                        log.error("Exception while performing gNOI reboot() for device " + deviceId, error);
+                        return false;
+                    }
+                });
+
+        return future;
+    }
+
+    @Override
+    public CompletableFuture<Long> time() {
+        if (!setupBehaviour()) {
+            return CompletableFuture.completedFuture(0L);
+        }
+        final CompletableFuture<Long> future = client.time()
+                .handle((response, error) -> {
+                    if (error == null) {
+                        log.debug("gNOI time() for device {} returned {}", deviceId.uri(), response.getTime());
+                        return response.getTime();
+                    } else {
+                        log.error("Exception while performing gNOI time() for device " + deviceId, error);
+                        return 0L;
+                    }
+                });
+
+        return future;
+    }
+}