/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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.
*/
package org.apache.geode.management.internal.configuration.callbacks;
import org.apache.commons.io.FileUtils;
import org.apache.geode.distributed.internal.ClusterConfigurationService;
import org.apache.logging.log4j.Logger;
import org.apache.geode.cache.EntryEvent;
import org.apache.geode.cache.util.CacheListenerAdapter;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.management.internal.configuration.domain.Configuration;
import java.io.File;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
/****
* CacheListener on ConfigRegion on Locators to write the configuration changes to file-system.
*
*/
public class ConfigurationChangeListener extends CacheListenerAdapter<String, Configuration> {
private static final Logger logger = LogService.getLogger();
private final ClusterConfigurationService sharedConfig;
public ConfigurationChangeListener(ClusterConfigurationService sharedConfig) {
this.sharedConfig = sharedConfig;
}
@Override
public void afterUpdate(EntryEvent<String, Configuration> event) {
super.afterUpdate(event);
addOrRemoveJarFromFilesystem(event);
}
@Override
public void afterCreate(EntryEvent<String, Configuration> event) {
super.afterCreate(event);
addOrRemoveJarFromFilesystem(event);
}
// when a new jar is added, if it does not exist in the current locator, download it from
// another locator.
// when a jar is removed, if it exists in the current locator, remove it.
private void addOrRemoveJarFromFilesystem(EntryEvent<String, Configuration> event) {
String group = event.getKey();
Configuration newConfig = (Configuration) event.getNewValue();
Configuration oldConfig = (Configuration) event.getOldValue();
Set<String> newJars = newConfig.getJarNames();
Set<String> oldJars = (oldConfig == null) ? new HashSet<>() : oldConfig.getJarNames();
Set<String> jarsAdded = new HashSet<>(newJars);
Set<String> jarsRemoved = new HashSet<>(oldJars);
jarsAdded.removeAll(oldJars);
jarsRemoved.removeAll(newJars);
if (!jarsAdded.isEmpty() && !jarsRemoved.isEmpty()) {
throw new IllegalStateException(
"We don't expect to have jars both added and removed in one event");
}
for (String jarAdded : jarsAdded) {
if (!jarExistsInFilesystem(group, jarAdded)) {
try {
sharedConfig.downloadJarFromOtherLocators(group, jarAdded);
} catch (Exception e) {
logger.error("Unable to add jar: " + jarAdded, e);
}
}
}
for (String jarRemoved : jarsRemoved) {
File jar = sharedConfig.getPathToJarOnThisLocator(group, jarRemoved).toFile();
if (jar.exists()) {
try {
FileUtils.forceDelete(jar);
} catch (IOException e) {
logger.error(
"Exception occurred while attempting to delete a jar from the filesystem: {}",
jarRemoved, e);
}
}
}
}
private boolean jarExistsInFilesystem(String groupName, String jarName) {
return sharedConfig.getPathToJarOnThisLocator(groupName, jarName).toFile().exists();
}
}