1 files changed, 90 insertions, 0 deletions
diff --git a/src/main/java/org/onap/dcaegen2/services/pmmapper/config/DynamicConfiguration.java b/src/main/java/org/onap/dcaegen2/services/pmmapper/config/DynamicConfiguration.java
new file mode 100644
index 0000000..37fa8b5
--- /dev/null
+++ b/src/main/java/org/onap/dcaegen2/services/pmmapper/config/DynamicConfiguration.java
@@ -0,0 +1,90 @@
+/*-
+ * ============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.dcaegen2.services.pmmapper.config;
+
+import io.undertow.server.HttpHandler;
+import io.undertow.server.HttpServerExchange;
+import io.undertow.util.StatusCodes;
+import lombok.Data;
+import org.onap.dcaegen2.services.pmmapper.exceptions.ReconfigurationException;
+import org.onap.dcaegen2.services.pmmapper.model.MapperConfig;
+import org.onap.dcaegen2.services.pmmapper.utils.HttpServerExchangeAdapter;
+import org.onap.logging.ref.slf4j.ONAPLogAdapter;
+import org.slf4j.LoggerFactory;
+
+import java.util.List;
+
+@Data
+public class DynamicConfiguration implements HttpHandler{
+    private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(DynamicConfiguration.class));
+    private List<Configurable> configurables;
+    private MapperConfig originalConfig;
+    private ConfigHandler configHandler;
+
+    /**
+     * Creates a Dynamic Configuration object with a list of configurable objects.
+     * @param configurables list of objects to reconfigure
+     * @param originalConfig original config to compare against.
+     */
+    public DynamicConfiguration(List<Configurable> configurables, MapperConfig originalConfig){
+        this.configurables = configurables;
+        this.originalConfig = originalConfig;
+        this.configHandler = new ConfigHandler();
+    }
+
+    private void applyConfiguration(MapperConfig updatedConfig) throws ReconfigurationException {
+        for (Configurable configurable : configurables) {
+            logger.unwrap().debug("Reconfiguring: {}", configurable);
+            configurable.reconfigure(updatedConfig);
+        }
+    }
+
+    /**
+     * Receives requests to pull the latest configuration from CBS.
+     * @param httpServerExchange inbound http server exchange.
+     * @throws Exception
+     */
+    @Override
+    public void handleRequest(HttpServerExchange httpServerExchange) throws Exception {
+        try {
+            logger.entering(new HttpServerExchangeAdapter(httpServerExchange));
+            MapperConfig config = configHandler.getMapperConfig();
+            int responseCode = StatusCodes.OK;
+            String responseMessage = StatusCodes.OK_STRING;
+
+            if (!this.originalConfig.equals(config)) {
+                logger.unwrap().info("Configuration update detected.");
+                logger.unwrap().info("Reconfiguring configurables");
+                try {
+                    applyConfiguration(config);
+                    this.originalConfig = config;
+                } catch (ReconfigurationException e) {
+                    responseCode = StatusCodes.INTERNAL_SERVER_ERROR;
+                    responseMessage = StatusCodes.INTERNAL_SERVER_ERROR_STRING;
+                    applyConfiguration(this.originalConfig);
+                }
+            }
+            httpServerExchange.setStatusCode(responseCode).getResponseSender().send(responseMessage);
+        } finally {
+            logger.exiting();
+        }
+    }
+}