SDN-R Sodium compliant netconfnode-state-service and devicemanager

[ccsdk/features.git] / sdnr / wt / devicemanager / provider / src / main / java / org / onap / ccsdk / features / sdnr / wt / devicemanager / impl / util / OdlClusterSingleton.java

diff --git a/sdnr/wt/devicemanager/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/devicemanager/impl/util/OdlClusterSingleton.java b/sdnr/wt/devicemanager/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/devicemanager/impl/util/OdlClusterSingleton.java
new file mode 100644 (file)
index 0000000..49c0401
--- /dev/null
+++ b/sdnr/wt/devicemanager/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/devicemanager/impl/util/OdlClusterSingleton.java
@@ -0,0 +1,72 @@
+/*
+ * ============LICENSE_START========================================================================
+ * ONAP : ccsdk feature sdnr wt
+ * =================================================================================================
+ * Copyright (C) 2020 highstreet technologies GmbH Intellectual Property. All rights reserved.
+ * =================================================================================================
+ * 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.
+ * ============LICENSE_END==========================================================================
+ */
+package org.onap.ccsdk.features.sdnr.wt.devicemanager.impl.util;
+
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import org.eclipse.jdt.annotation.NonNull;
+import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonService;
+import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonServiceProvider;
+import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonServiceRegistration;
+import org.opendaylight.mdsal.singleton.common.api.ServiceGroupIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class OdlClusterSingleton implements ClusterSingletonService, AutoCloseable {
+
+    private static final Logger LOG = LoggerFactory.getLogger(OdlClusterSingleton.class);
+    private final @NonNull ServiceGroupIdentifier ident;
+    private final ClusterSingletonServiceRegistration cssRegistration;
+    private volatile boolean master;
+
+    @SuppressWarnings("null")
+    public OdlClusterSingleton(ClusterSingletonServiceProvider clusterSingletonServiceProvider) {
+        this.ident = ServiceGroupIdentifier.create("ODLEventListenerHandler");
+        this.cssRegistration = clusterSingletonServiceProvider.registerClusterSingletonService(this);
+        this.master = false;
+    }
+
+    @Override
+    public @NonNull ServiceGroupIdentifier getIdentifier() {
+        return ident;
+    }
+
+    @Override
+    public void instantiateServiceInstance() {
+        LOG.debug("We take Leadership");
+        this.master = true;
+    }
+
+    @Override
+    public ListenableFuture<? extends Object> closeServiceInstance() {
+        LOG.debug("We lost Leadership");
+        this.master = false;
+        return Futures.immediateFuture(null);
+    }
+
+    public boolean isMaster() {
+        return master;
+    }
+
+    @Override
+    public void close() throws Exception {
+        if (cssRegistration != null) {
+            cssRegistration.close();
+        }
+    }
+}