1 files changed, 188 insertions, 0 deletions
diff --git a/sli/provider/src/main/java/org/onap/ccsdk/sli/core/sli/provider/SvcLogicPropertiesProviderImpl.java b/sli/provider/src/main/java/org/onap/ccsdk/sli/core/sli/provider/SvcLogicPropertiesProviderImpl.java
new file mode 100644
index 00000000..a9992a09
--- /dev/null
+++ b/sli/provider/src/main/java/org/onap/ccsdk/sli/core/sli/provider/SvcLogicPropertiesProviderImpl.java
@@ -0,0 +1,188 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * onap
+ * ================================================================================
+ * Copyright (C) 2016 - 2017 ONAP
+ * ================================================================================
+ * 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.onap.ccsdk.sli.core.sli.provider;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.Vector;
+
+import org.onap.ccsdk.sli.core.dblib.DblibConfigurationException;
+import org.onap.ccsdk.sli.core.sli.ConfigurationException;
+import org.onap.ccsdk.sli.core.utils.JREFileResolver;
+import org.onap.ccsdk.sli.core.utils.KarafRootFileResolver;
+import org.onap.ccsdk.sli.core.utils.PropertiesFileResolver;
+import org.onap.ccsdk.sli.core.utils.common.CoreDefaultFileResolver;
+import org.onap.ccsdk.sli.core.utils.common.SdncConfigEnvVarFileResolver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Responsible for determining the properties file to use and instantiating the
+ * <code>DBResourceManager</code> Service. The priority for properties file
+ * resolution is as follows:
+ *
+ * <ol>
+ * <li>A directory identified by the system environment variable
+ * <code>SDNC_CONFIG_DIR</code></li>
+ * <li>The default directory <code>DEFAULT_DBLIB_PROP_DIR</code></li>
+ * <li>A directory identified by the JRE argument
+ * <code>dblib.properties</code></li>
+ * <li>A <code>dblib.properties</code> file located in the karaf root
+ * directory</li>
+ * </ol>
+ */
+public class SvcLogicPropertiesProviderImpl implements SvcLogicPropertiesProvider {
+
+	private static final Logger LOG = LoggerFactory.getLogger(SvcLogicPropertiesProviderImpl.class);
+
+	/**
+	 * The name of the properties file for database configuration
+	 */
+	private static final String SVCLOGIC_PROP_FILE_NAME = "svclogic.properties";
+
+	/**
+	 * A prioritized list of strategies for resolving dblib properties files.
+	 */
+	private Vector<PropertiesFileResolver> sliPropertiesFileResolvers = new Vector<>();
+
+	/**
+	 * The configuration properties for the db connection.
+	 */
+	private Properties properties;
+
+	/**
+	 * Set up the prioritized list of strategies for resolving dblib properties
+	 * files.
+	 */
+	public SvcLogicPropertiesProviderImpl() {
+		sliPropertiesFileResolvers
+				.add(new SdncConfigEnvVarFileResolver("Using property file (1) from environment variable"));
+		sliPropertiesFileResolvers.add(new CoreDefaultFileResolver("Using property file (2) from default directory"));
+
+		sliPropertiesFileResolvers.add(
+				new JREFileResolver("Using property file (3) from JRE argument", SvcLogicPropertiesProviderImpl.class));
+		sliPropertiesFileResolvers.add(new KarafRootFileResolver("Using property file (4) from karaf root", this));
+
+		// determines properties file as according to the priority described in the
+		// class header comment
+		final File propertiesFile = determinePropertiesFile(this);
+		if (propertiesFile != null) {
+			try (FileInputStream fileInputStream = new FileInputStream(propertiesFile)) {
+				properties = new Properties();
+				properties.load(fileInputStream);
+			} catch (final IOException e) {
+				LOG.error("Failed to load properties for file: {}", propertiesFile.toString(),
+						new ConfigurationException("Failed to load properties for file: " + propertiesFile.toString(),
+								e));
+			}
+		} else {
+			// Try to read properties as resource
+
+			InputStream propStr = getClass().getResourceAsStream("/" + SVCLOGIC_PROP_FILE_NAME);
+			if (propStr != null) {
+				properties = new Properties();
+				try {
+					properties.load(propStr);
+					propStr.close();
+				} catch (IOException e) {
+					properties = null;
+				}
+			}
+
+		}
+
+		if (properties == null) {
+			reportFailure("Missing configuration properties resource(3)", new ConfigurationException(
+					"Missing configuration properties resource(3): " + SVCLOGIC_PROP_FILE_NAME));
+		}
+	}
+
+	/**
+	 * Extract svclogic config properties.
+	 *
+	 * @return the svclogic config properties
+	 */
+	public Properties getProperties() {
+		return properties;
+	}
+
+	/**
+	 * Reports the method chosen for properties resolution to the
+	 * <code>Logger</code>.
+	 *
+	 * @param message
+	 *            Some user friendly message
+	 * @param fileOptional
+	 *            The file location of the chosen properties file
+	 * @return the file location of the chosen properties file
+	 */
+	private static File reportSuccess(final String message, final Optional<File> fileOptional) {
+		if (fileOptional.isPresent()) {
+			final File file = fileOptional.get();
+			LOG.info("{} {}", message, file.getPath());
+			return file;
+		}
+		return null;
+	}
+
+	/**
+	 * Reports fatal errors. This is the case in which no properties file could be
+	 * found.
+	 *
+	 * @param message
+	 *            An appropriate fatal error message
+	 * @param configurationException
+	 *            An exception describing what went wrong during resolution
+	 */
+	private static void reportFailure(final String message, final ConfigurationException configurationException) {
+
+		LOG.error("{}", message, configurationException);
+	}
+
+	/**
+	 * Determines the dblib properties file to use based on the following priority:
+	 * <ol>
+	 * <li>A directory identified by the system environment variable
+	 * <code>SDNC_CONFIG_DIR</code></li>
+	 * <li>The default directory <code>DEFAULT_DBLIB_PROP_DIR</code></li>
+	 * <li>A directory identified by the JRE argument
+	 * <code>dblib.properties</code></li>
+	 * <li>A <code>dblib.properties</code> file located in the karaf root
+	 * directory</li>
+	 * </ol>
+	 */
+	File determinePropertiesFile(final SvcLogicPropertiesProviderImpl resourceProvider) {
+
+		for (final PropertiesFileResolver sliPropertiesFileResolver : sliPropertiesFileResolvers) {
+			final Optional<File> fileOptional = sliPropertiesFileResolver.resolveFile(SVCLOGIC_PROP_FILE_NAME);
+			if (fileOptional.isPresent()) {
+				return reportSuccess(sliPropertiesFileResolver.getSuccessfulResolutionMessage(), fileOptional);
+			}
+		}
+
+		return null;
+	}
+}