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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=========================================================
*/
package org.openecomp.sdc.common.impl;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.jci.listeners.FileChangeListener;
import org.openecomp.sdc.common.api.BasicConfiguration;
import org.openecomp.sdc.common.api.ConfigurationListener;
import org.openecomp.sdc.common.log.enums.EcompLoggerErrorCode;
import org.openecomp.sdc.common.log.wrappers.Logger;
import org.openecomp.sdc.common.util.YamlToObjectConverter;
import org.openecomp.sdc.exception.YamlConversionException;
public class ConfigFileChangeListener extends FileChangeListener {
private static final Logger LOGGER = Logger.getLogger(ConfigFileChangeListener.class.getName());
private Map<String, List<ConfigurationListener>> fileChangeToCallBack = new HashMap<>();
private Object lock = new Object();
private YamlToObjectConverter yamlToObjectConverter = new YamlToObjectConverter();
@Override
public void onFileChange(File pFile) {
super.onFileChange(pFile);
if (pFile == null) {
LOGGER.debug("Invalid file '{}'.", pFile);
return;
}
if (fileChangeToCallBack == null) {
LOGGER.debug("File '{}' callback is null.", pFile);
return;
}
final String id = findIdFromFileName(pFile.getName());
if (id == null) {
LOGGER.warn(EcompLoggerErrorCode.UNKNOWN_ERROR, "", "", "Cannot calculate id from file {}", pFile.getName());
return;
}
final List<ConfigurationListener> listeners = fileChangeToCallBack.get(id);
if (CollectionUtils.isEmpty(listeners)) {
LOGGER.debug("No file listeners for file '{}', id '{}'.", pFile, id);
return;
}
for (final ConfigurationListener configurationListener : listeners) {
final Class<? extends BasicConfiguration> configClass = configurationListener.getType();
final BasicConfiguration basicConfiguration;
try {
basicConfiguration = yamlToObjectConverter.convert(pFile.getAbsolutePath(), configClass);
} catch (final YamlConversionException e) {
LOGGER.warn(EcompLoggerErrorCode.SCHEMA_ERROR, "Configuration", "Configuration",
"Cannot update the listeners for file Change since the file content is invalid: {}", e.getLocalizedMessage());
continue;
}
LOGGER.debug("Loaded configuration after converting is {}", basicConfiguration);
configurationListener.getCallBack().reconfigure(basicConfiguration);
}
LOGGER.debug("File {} was changed.", pFile);
}
private String findIdFromFileName(String name) {
String result = null;
if (name != null) {
int startIndex = 0;
int endIndex = name.length();
if (name.contains(File.separator)) {
startIndex = name.lastIndexOf(File.separator);
}
result = name.substring(startIndex, endIndex);
}
return result;
}
public void register(String id, ConfigurationListener configurationListener) {
if (configurationListener != null) {
synchronized (lock) {
List<ConfigurationListener> callbacks = fileChangeToCallBack.get(id);
if (callbacks == null) {
callbacks = new ArrayList<>();
fileChangeToCallBack.put(id, callbacks);
}
callbacks.add(configurationListener);
}
}
}
}
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