hadoop CsiAdaptorFactory 源码
haddop CsiAdaptorFactory 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-csi/src/main/java/org/apache/hadoop/yarn/csi/adaptor/CsiAdaptorFactory.java
/**
* 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.hadoop.yarn.csi.adaptor;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.yarn.api.CsiAdaptorPlugin;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Desired csi-adaptor implementation is configurable, default to
* CsiAdaptorProtocolService. If user wants to have a different implementation,
* just to configure a different class for the csi-driver.
*/
public final class CsiAdaptorFactory {
private static final Logger LOG =
LoggerFactory.getLogger(CsiAdaptorFactory.class);
private CsiAdaptorFactory() {
// hide constructor for this factory class.
}
/**
* Load csi-driver-adaptor from configuration. If the configuration is not
* specified, the default implementation
* for the adaptor is {@link DefaultCsiAdaptorImpl}. If the configured class
* is not a valid variation of {@link CsiAdaptorPlugin} or the class cannot
* be found, this function will throw a RuntimeException.
* @param driverName
* @param conf
* @return CsiAdaptorPlugin
* @throws YarnException if unable to create the adaptor class.
* @throws RuntimeException if given class is not found or not
* an instance of {@link CsiAdaptorPlugin}
*/
public static CsiAdaptorPlugin getAdaptor(String driverName,
Configuration conf) throws YarnException {
// load configuration
String configName = YarnConfiguration.NM_CSI_ADAPTOR_PREFIX
+ driverName + YarnConfiguration.NM_CSI_ADAPTOR_CLASS;
Class<? extends CsiAdaptorPlugin> impl = conf.getClass(configName,
DefaultCsiAdaptorImpl.class, CsiAdaptorPlugin.class);
if (impl == null) {
throw new YarnException("Unable to init csi-adaptor from the"
+ " class specified via " + configName);
}
// init the adaptor
CsiAdaptorPlugin instance = ReflectionUtils.newInstance(impl, conf);
LOG.info("csi-adaptor initiated, implementation: "
+ impl.getCanonicalName());
return instance;
}
}
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