Fix Sonar complains

[oam/nf-oam-adopter.git] / ves-nf-oam-adopter / ves-nf-oam-adopter-api / src / main / java / org / o / ran / oam / nf / oam / adopter / spi / MapperConfigProvider.java

diff --git a/ves-nf-oam-adopter/ves-nf-oam-adopter-api/src/main/java/org/o/ran/oam/nf/oam/adopter/spi/MapperConfigProvider.java b/ves-nf-oam-adopter/ves-nf-oam-adopter-api/src/main/java/org/o/ran/oam/nf/oam/adopter/spi/MapperConfigProvider.java
new file mode 100644 (file)
index 0000000..d1cdbba
--- /dev/null
+++ b/ves-nf-oam-adopter/ves-nf-oam-adopter-api/src/main/java/org/o/ran/oam/nf/oam/adopter/spi/MapperConfigProvider.java
@@ -0,0 +1,72 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  O-RAN-SC
+ *  ================================================================================
+ *  Copyright © 2021 AT&T 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.o.ran.oam.nf.oam.adopter.spi;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.nio.file.Paths;
+import javax.annotation.PostConstruct;
+import org.apache.commons.configuration2.YAMLConfiguration;
+import org.apache.commons.configuration2.builder.ConfigurationBuilderEvent;
+import org.apache.commons.configuration2.builder.ReloadingFileBasedConfigurationBuilder;
+import org.apache.commons.configuration2.builder.fluent.Parameters;
+import org.apache.commons.configuration2.ex.ConfigurationException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class MapperConfigProvider<T> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(MapperConfigProvider.class);
+
+    private static final ObjectMapper YAML_READER = new ObjectMapper(new YAMLFactory());
+    private ReloadingFileBasedConfigurationBuilder<YAMLConfiguration> builder;
+
+    /**
+     * Initialize Service.
+     */
+    @PostConstruct
+    public final void init() throws IOException, ConfigurationException {
+        final var filePath = Paths.get(getMappingFilePath()).toUri();
+        builder = new ReloadingFileBasedConfigurationBuilder<>(YAMLConfiguration.class)
+                          .configure(new Parameters().hierarchical().setURL(filePath.toURL()));
+        builder.addEventListener(ConfigurationBuilderEvent.CONFIGURATION_REQUEST, event -> {
+            builder.getReloadingController().checkForReloading(null);
+            LOG.debug("Reloading {}", filePath);
+        });
+        //Test initial configuration
+        builder.getConfiguration();
+    }
+
+    public abstract String getMappingFilePath();
+
+    /**
+     * Provide VES Mapping configuration.
+     */
+    public final T getVesMappingConfiguration() throws ConfigurationException, IOException {
+        final YAMLConfiguration configuration = builder.getConfiguration();
+        final var output = new StringWriter();
+        configuration.write(output);
+        return YAML_READER.readValue(output.toString(), getClazz());
+    }
+
+    public abstract Class<T> getClazz();
+}