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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 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=========================================================
* Modifications copyright (c) 2019 Nokia
* ================================================================================
*/
package org.openecomp.sdc.common.impl;
import java.util.Arrays;
import java.util.stream.Collectors;
import org.openecomp.sdc.common.api.ConfigurationListener;
import org.openecomp.sdc.common.api.ConfigurationSource;
import org.openecomp.sdc.common.api.Constants;
import org.openecomp.sdc.common.api.exception.LoadConfigurationException;
import org.openecomp.sdc.common.util.YamlToObjectConverter;
import org.openecomp.sdc.exception.YamlConversionException;
/**
* Read configuration from file system
*
* @author esofer
*/
public class FSConfigurationSource implements ConfigurationSource {
private final YamlToObjectConverter yamlToObjectConverter = new YamlToObjectConverter();
private final ConfigFileChangeListener changeListener;
private final String appConfigDir;
public FSConfigurationSource(ConfigFileChangeListener changeListener, String appConfigDir) {
super();
this.changeListener = changeListener;
this.appConfigDir = appConfigDir;
}
/**
* convert camel case string to list of words separated by "-" where each word is in lower case format. For example, MyClass will be calculated to
* be my-class.yaml .
*
* @param className
* @return file name based on the class name
*/
static <T> String calculateFileName(Class<T> className) {
String[] words = className.getSimpleName().split("(?=\\p{Upper})");
return Arrays.stream(words).map(String::toLowerCase)
.collect(Collectors.collectingAndThen(Collectors.joining("-"), str -> str + Constants.YAML_SUFFIX));
}
/*
* get and watch configuration changes. The file name we looking for is the lower case of the class name separated by "-".
*
* (non-Javadoc)
*
* @see org.openecomp.sdc.common.api.ConfigurationSource#getAndWatchConfiguration (java.lang.Class, org.openecomp.sdc.common.api.ConfigurationListener)
*/
public <T> T getAndWatchConfiguration(final Class<T> className, final ConfigurationListener configurationListener) {
final String configFileName = calculateFileName(className);
T object;
try {
object = yamlToObjectConverter.convert(this.appConfigDir, className, configFileName);
} catch (final YamlConversionException e) {
final String errorMsg = String.format("Could not load '%s' in '%s' for class '%s'", configFileName, appConfigDir, className);
throw new LoadConfigurationException(errorMsg, e);
}
if (configurationListener != null && changeListener != null) {
changeListener.register(configFileName, configurationListener);
}
return object;
}
public <T> void addWatchConfiguration(Class<T> className, ConfigurationListener configurationListener) {
String configFileName = calculateFileName(className);
if (configurationListener != null) {
changeListener.register(configFileName, configurationListener);
}
}
}
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