org.apache.bookkeeper.mledger.offload.OffloadersCache Maven / Gradle / Ivy
/**
* 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.bookkeeper.mledger.offload;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import lombok.extern.slf4j.Slf4j;
/**
* Implementation of an Offloaders. The main purpose of this class is to
* ensure that an Offloaders directory is only loaded once.
*/
@Slf4j
public class OffloadersCache implements AutoCloseable {
private Map loadedOffloaders = new ConcurrentHashMap<>();
/**
* Method to load an Offloaders directory or to get an already loaded Offloaders directory.
*
* @param offloadersPath - the directory to search the offloaders nar files
* @param narExtractionDirectory - the directory to use for extraction
* @return the loaded offloaders class
* @throws IOException when fail to retrieve the pulsar offloader class
*/
public Offloaders getOrLoadOffloaders(String offloadersPath, String narExtractionDirectory) {
return loadedOffloaders.computeIfAbsent(offloadersPath,
(directory) -> {
try {
return OffloaderUtils.searchForOffloaders(directory, narExtractionDirectory);
} catch (IOException e) {
throw new RuntimeException(e);
}
});
}
@Override
public void close() {
loadedOffloaders.values().forEach(offloaders -> {
try {
offloaders.close();
} catch (Exception e) {
log.error("Error while closing offloader.", e);
// Even if the offloader fails to close, the graceful shutdown process continues
}
});
// Don't want to hold on to references to closed offloaders
loadedOffloaders.clear();
}
}