hadoop DNSOperationsFactory 源码
haddop DNSOperationsFactory 代码
文件路径：/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/api/DNSOperationsFactory.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.registry.client.api;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.registry.server.dns.RegistryDNS;
/**
* A factory for DNS operation service instances.
*/
public final class DNSOperationsFactory implements RegistryConstants {
/**
* DNS Implementation type.
*/
public enum DNSImplementation {
DNSJAVA
}
private DNSOperationsFactory() {
}
/**
* Create and initialize a DNS operations instance.
*
* @param conf configuration
* @return a DNS operations instance
*/
public static DNSOperations createInstance(Configuration conf) {
return createInstance("DNSOperations", DNSImplementation.DNSJAVA, conf);
}
/**
* Create and initialize a registry operations instance.
* Access rights will be determined from the configuration.
*
* @param name name of the instance
* @param impl the DNS implementation.
* @param conf configuration
* @return a registry operations instance
*/
public static DNSOperations createInstance(String name,
DNSImplementation impl,
Configuration conf) {
Preconditions.checkArgument(conf != null, "Null configuration");
DNSOperations operations = null;
switch (impl) {
case DNSJAVA:
operations = new RegistryDNS(name);
break;
default:
throw new IllegalArgumentException(
String.format("%s is not available", impl.toString()));
}
//operations.init(conf);
return operations;
}
}
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