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/*-
* ============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.dblib;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Optional;
import java.util.Properties;
import java.util.Vector;
import org.onap.ccsdk.sli.core.utils.dblib.DblibDefaultFileResolver;
import org.onap.ccsdk.sli.core.utils.dblib.DblibEnvVarFileResolver;
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.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 DBLIBResourceProvider {
private static final Logger LOG = LoggerFactory.getLogger(DBLIBResourceProvider.class);
/**
* The name of the properties file for database configuration
*/
private static final String DBLIB_PROP_FILE_NAME = "dblib.properties";
/**
* A prioritized list of strategies for resolving dblib properties files.
*/
private Vector<PropertiesFileResolver> dblibPropertiesFileResolvers = 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 DBLIBResourceProvider() {
dblibPropertiesFileResolvers.add(new DblibEnvVarFileResolver(
"Using property file (1) from environment variable"
));
dblibPropertiesFileResolvers.add(new DblibDefaultFileResolver(
"Using property file (1) from default directory"
));
dblibPropertiesFileResolvers.add(new JREFileResolver(
"Using property file (2) from JRE argument", DBLIBResourceProvider.class
));
dblibPropertiesFileResolvers.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 DblibConfigurationException("Failed to load properties for file: "
+ propertiesFile.toString(), e));
}
}
}
/**
* Extract db config properties.
*
* @return the db 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 dblibConfigurationException An exception describing what went wrong during resolution
*/
private static void reportFailure(final String message,
final DblibConfigurationException dblibConfigurationException) {
LOG.error("{}", message, dblibConfigurationException);
}
/**
* 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 DBLIBResourceProvider dblibResourceProvider) {
for (final PropertiesFileResolver dblibPropertiesFileResolver : dblibPropertiesFileResolvers) {
final Optional<File> fileOptional = dblibPropertiesFileResolver.resolveFile(DBLIB_PROP_FILE_NAME);
if (fileOptional.isPresent()) {
return reportSuccess(dblibPropertiesFileResolver.getSuccessfulResolutionMessage(), fileOptional);
}
}
reportFailure("Missing configuration properties resource(3)",
new DblibConfigurationException("Missing configuration properties resource(3): "
+ DBLIB_PROP_FILE_NAME));
return null;
}
}
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