1 files changed, 106 insertions, 0 deletions
diff --git a/cps-ncmp-rest/src/main/java/org/onap/cps/ncmp/rest/controller/handlers/NcmpDatastoreRequestHandler.java b/cps-ncmp-rest/src/main/java/org/onap/cps/ncmp/rest/controller/handlers/NcmpDatastoreRequestHandler.java
new file mode 100644
index 000000000..850200396
--- /dev/null
+++ b/cps-ncmp-rest/src/main/java/org/onap/cps/ncmp/rest/controller/handlers/NcmpDatastoreRequestHandler.java
@@ -0,0 +1,106 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 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.cps.ncmp.rest.controller.handlers;
+
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.Supplier;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.onap.cps.ncmp.api.NetworkCmProxyDataService;
+import org.onap.cps.ncmp.rest.executor.CpsNcmpTaskExecutor;
+import org.onap.cps.ncmp.rest.util.TopicValidator;
+import org.onap.cps.spi.FetchDescendantsOption;
+import org.springframework.http.ResponseEntity;
+
+@RequiredArgsConstructor
+@Slf4j
+public abstract class NcmpDatastoreRequestHandler {
+
+    private static final String NO_REQUEST_ID = null;
+    private static final String NO_TOPIC = null;
+
+    protected final NetworkCmProxyDataService networkCmProxyDataService;
+    protected final CpsNcmpTaskExecutor cpsNcmpTaskExecutor;
+    protected final int timeOutInMilliSeconds;
+    protected final boolean notificationFeatureEnabled;
+
+    protected abstract Supplier<Object> getTaskSupplier(final String cmHandle,
+                                                        final String resourceIdentifier,
+                                                        final String optionsParamInQuery,
+                                                        final String topicParamInQuery,
+                                                        final String requestId,
+                                                        final Boolean includeDescendant);
+
+    /**
+     * Execute a request on a datastore.
+     *
+     * @param cmHandleId          the cm handle
+     * @param resourceIdentifier  the resource identifier
+     * @param optionsParamInQuery the options param in query
+     * @param topicParamInQuery   the topic param in query
+     * @param includeDescendants  whether include descendants
+     * @return the response entity
+     */
+    public ResponseEntity<Object> executeRequest(final String cmHandleId,
+                                                 final String resourceIdentifier,
+                                                 final String optionsParamInQuery,
+                                                 final String topicParamInQuery,
+                                                 final Boolean includeDescendants) {
+
+        final boolean asyncResponseRequested = topicParamInQuery != null;
+        if (asyncResponseRequested && notificationFeatureEnabled) {
+            final String requestId = UUID.randomUUID().toString();
+            final Supplier<Object> taskSupplier = getTaskSupplier(cmHandleId, resourceIdentifier, optionsParamInQuery,
+                topicParamInQuery, requestId, includeDescendants);
+            return executeTaskAsync(topicParamInQuery, requestId, taskSupplier);
+        }
+
+        if (asyncResponseRequested) {
+            log.warn("Asynchronous request is unavailable as notification feature is currently disabled, "
+                + "will use synchronous operation.");
+        }
+        final Supplier<Object> taskSupplier = getTaskSupplier(cmHandleId, resourceIdentifier, optionsParamInQuery,
+            NO_TOPIC, NO_REQUEST_ID, includeDescendants);
+        return executeTaskSync(taskSupplier);
+    }
+
+    protected ResponseEntity<Object> executeTaskAsync(final String topicParamInQuery,
+                                                      final String requestId,
+                                                      final Supplier<Object> taskSupplier) {
+
+        TopicValidator.validateTopicName(topicParamInQuery);
+        log.debug("Received Async request with id {}", requestId);
+        cpsNcmpTaskExecutor.executeTask(taskSupplier, timeOutInMilliSeconds);
+
+        return ResponseEntity.ok(Map.of("requestId", requestId));
+    }
+
+    protected ResponseEntity<Object> executeTaskSync(final Supplier<Object> taskSupplier) {
+        return ResponseEntity.ok(taskSupplier.get());
+    }
+
+    protected static FetchDescendantsOption getFetchDescendantsOption(final Boolean includeDescendant) {
+        return Boolean.TRUE.equals(includeDescendant) ? FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS
+            : FetchDescendantsOption.OMIT_DESCENDANTS;
+    }
+
+}