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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017, 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.openecomp.sdc.common;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.function.BiConsumer;
import org.onap.sdc.tosca.services.YamlUtil;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
/**
* This is a common class that can access the config file given in input to the JVM with the parameter -Dconfiguration.yaml=file.yaml.
*/
public class CommonConfigurationManager {
public static final String JVM_PARAM_CONFIGURATION_FILE = "configuration.yaml";
private static final Logger LOGGER = LoggerFactory.getLogger(CommonConfigurationManager.class);
private static CommonConfigurationManager singletonInstance;
private Map<String, LinkedHashMap<String, Object>> configuration;
private String configFilename;
private String yamlSection;
protected CommonConfigurationManager() {
initConfiguration();
}
protected CommonConfigurationManager(String yamlSection) {
this();
this.yamlSection = yamlSection;
}
public static synchronized CommonConfigurationManager getInstance() {
if (singletonInstance == null) {
singletonInstance = new CommonConfigurationManager();
}
return singletonInstance;
}
public void reload() {
initConfiguration();
}
private void initConfiguration() {
YamlUtil yamlUtil = new YamlUtil();
readConfigurationFromStream(yamlUtil, (filename, stream) -> {
this.configFilename = filename;
if (stream == null) {
LOGGER.warn("Configuration not found: " + filename + ". Using defaults");
return;
}
Map<String, LinkedHashMap<String, Object>> configurationMap = yamlUtil.yamlToMap(stream);
if (configurationMap == null) {
LOGGER.warn("Configuration cannot be parsed: " + filename + ". Using defaults");
return;
} else {
this.configuration = configurationMap;
}
});
}
private void readConfigurationFromStream(YamlUtil yamlUtil, BiConsumer<String, InputStream> reader) {
String configurationYamlFile = System.getProperty(JVM_PARAM_CONFIGURATION_FILE);
try {
if (configurationYamlFile == null) {
try (InputStream inputStream = yamlUtil.loadYamlFileIs("/" + JVM_PARAM_CONFIGURATION_FILE)) {
reader.accept(JVM_PARAM_CONFIGURATION_FILE, inputStream);
}
} else {
try (InputStream inputStream = new FileInputStream(configurationYamlFile)) {
reader.accept(configurationYamlFile, inputStream);
}
}
} catch (IOException e) {
LOGGER.error("Failed to read configuration " + configurationYamlFile, e);
throw new RuntimeException("Failed to read configuration " + configurationYamlFile, e);
}
}
/**
* This method can be used to access any yaml section configuration.
*
* @param yamlSection The yaml section that must be accessed
* @param name The configuration name inside that yaml section
* @param defaultValue A default value
* @param <T> The type of value to be returned
* @return The value found or the default value if not found
*/
public <T> T getConfigValue(String yamlSection, String name, T defaultValue) {
Map<String, Object> section = this.configuration.get(yamlSection);
if (section == null) {
LOGGER.error("Section " + yamlSection + " is missing in configuration file '" + configFilename +
"'. Using defaults");
return defaultValue;
}
Object value = section.get(name);
try {
return value == null ? defaultValue : (T) value;
} catch (ClassCastException e) {
LOGGER.warn(
String.format("Failed to read configuration property '%s' as requested type. Using default '%s'",
name, defaultValue), e);
return defaultValue;
}
}
/**
* This method can be used to access a specific configuration parameter in the configuration in the yamlSection predefined in the constructor.
*
* @param name The name of the config
* @param defaultValue A default value
* @param <T> The type of value to be returned
* @return The value found or the default value if not found
*/
public <T> T getConfigValue(String name, T defaultValue) {
return this.getConfigValue(yamlSection, name, defaultValue);
}
}
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