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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.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;
}
}
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