OAM NF Adopter SNMP Manager

[oam/nf-oam-adopter.git] / ves-nf-oam-adopter / ves-nf-oam-adopter-snmp-manager / src / main / java / org / o / ran / oam / nf / oam / adopter / snmp / manager / SnmpMappingConfigurationProvider.java

diff --git a/ves-nf-oam-adopter/ves-nf-oam-adopter-snmp-manager/src/main/java/org/o/ran/oam/nf/oam/adopter/snmp/manager/SnmpMappingConfigurationProvider.java b/ves-nf-oam-adopter/ves-nf-oam-adopter-snmp-manager/src/main/java/org/o/ran/oam/nf/oam/adopter/snmp/manager/SnmpMappingConfigurationProvider.java
new file mode 100644 (file)
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+++ b/ves-nf-oam-adopter/ves-nf-oam-adopter-snmp-manager/src/main/java/org/o/ran/oam/nf/oam/adopter/snmp/manager/SnmpMappingConfigurationProvider.java
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+/*
+ *  ============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.snmp.manager;
+
+import static java.util.Objects.requireNonNull;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.net.URI;
+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.event.EventListener;
+import org.apache.commons.configuration2.ex.ConfigurationException;
+import org.o.ran.oam.nf.oam.adopter.snmp.manager.pojos.VesMappingConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+/**
+ * Reads and listens for changes on snmp mapping configuration.
+ */
+@Service
+public class SnmpMappingConfigurationProvider {
+    private static final Logger LOG = LoggerFactory.getLogger(SnmpMappingConfigurationProvider.class);
+
+    private static final ObjectMapper YAML_READER = new ObjectMapper(new YAMLFactory());
+    @Value("${snmp-manager.mapping-config-path:#{null}}")
+    private String mappingFilePath;
+    private ReloadingFileBasedConfigurationBuilder<YAMLConfiguration> builder;
+
+    /**
+     * Initialize service.
+     * @throws IOException on error
+     */
+    @PostConstruct
+    public void init() throws IOException, ConfigurationException {
+        requireNonNull(mappingFilePath);
+        final URI filePath = Paths.get(mappingFilePath).toUri();
+        builder = new ReloadingFileBasedConfigurationBuilder<>(YAMLConfiguration.class)
+                .configure(new Parameters().hierarchical().setURL(filePath.toURL()));
+        builder.addEventListener(ConfigurationBuilderEvent.CONFIGURATION_REQUEST, (EventListener) event -> {
+            builder.getReloadingController().checkForReloading(null);
+            LOG.info("Reloading {}", filePath);
+        });
+        //Test initial configuration
+        builder.getConfiguration();
+    }
+
+    /**
+     * Reads VesMappingConfiguration from yaml file.
+     *
+     * @return Ves Mapping Configuration
+     */
+    public VesMappingConfiguration getVesMappingConfiguration() throws ConfigurationException, IOException {
+        final YAMLConfiguration configuration = builder.getConfiguration();
+        final StringWriter output = new StringWriter();
+        configuration.write(output);
+        return YAML_READER.readValue(output.toString(), VesMappingConfiguration.class);
+    }
+}