hadoop PrivilegedRegistryDNSStarter 源码
haddop PrivilegedRegistryDNSStarter 代码
文件路径：/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/server/dns/PrivilegedRegistryDNSStarter.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.server.dns;
import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.registry.client.api.DNSOperationsFactory;
import org.apache.hadoop.registry.conf.RegistryConfiguration;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.hadoop.registry.client.api.RegistryConstants.DEFAULT_DNS_PORT;
import static org.apache.hadoop.registry.client.api.RegistryConstants.KEY_DNS_PORT;
/**
* This class is used to allow the RegistryDNSServer to run on a privileged
* port (e.g. 53).
*/
public class PrivilegedRegistryDNSStarter implements Daemon {
private static final Logger LOG =
LoggerFactory.getLogger(PrivilegedRegistryDNSStarter.class);
private Configuration conf;
private RegistryDNS registryDNS;
private RegistryDNSServer registryDNSServer;
@Override
public void init(DaemonContext context) throws Exception {
String[] args = context.getArguments();
StringUtils.startupShutdownMessage(RegistryDNSServer.class, args, LOG);
conf = new RegistryConfiguration();
new GenericOptionsParser(conf, args);
int port = conf.getInt(KEY_DNS_PORT, DEFAULT_DNS_PORT);
if (port < 1 || port > 1023) {
throw new RuntimeException("Must start privileged registry DNS server " +
"with '" + KEY_DNS_PORT + "' configured to a privileged port.");
}
try {
registryDNS = (RegistryDNS) DNSOperationsFactory.createInstance(conf);
registryDNS.initializeChannels(conf);
} catch (Exception e) {
LOG.error("Error initializing Registry DNS", e);
throw e;
}
}
@Override
public void start() throws Exception {
registryDNSServer = RegistryDNSServer.launchDNSServer(conf, registryDNS);
}
@Override
public void stop() throws Exception {
}
@Override
public void destroy() {
registryDNSServer.stop();
}
}
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