--- /dev/null
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2019 Nordix 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.so.aaisimulator.service.providers;
+
+import java.util.Optional;
+import org.onap.aai.domain.yang.GenericVnfs;
+import org.onap.aai.domain.yang.ServiceInstance;
+import org.onap.so.aaisimulator.models.NodeServiceInstance;
+
+/**
+ * @author waqas.ikram@ericsson.com
+ *
+ */
+public interface NodesCacheServiceProvider extends Clearable {
+
+ void putNodeServiceInstance(final String serviceInstanceId, final NodeServiceInstance nodeServiceInstance);
+
+ Optional<NodeServiceInstance> getNodeServiceInstance(final String serviceInstanceId);
+
+ Optional<GenericVnfs> getGenericVnfs(final String vnfName);
+
+ Optional<ServiceInstance> getServiceInstance(final NodeServiceInstance nodeServiceInstance);
+
+}