hadoop AddressTypes 源码
haddop AddressTypes 代码
文件路径：/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/types/AddressTypes.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.types;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Enum of address types -as integers.
* Why integers and not enums? Cross platform serialization as JSON
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface AddressTypes {
/**
* hostname/FQDN and port pair: {@value}.
* The host/domain name and port are set as separate strings in the address
* list, e.g.
* <pre>
* ["namenode.example.org", "9870"]
* </pre>
*/
public static final String ADDRESS_HOSTNAME_AND_PORT = "host/port";
public static final String ADDRESS_HOSTNAME_FIELD = "host";
public static final String ADDRESS_PORT_FIELD = "port";
/**
* Path <code>/a/b/c</code> style: {@value}.
* The entire path is encoded in a single entry
*
* <pre>
* ["/users/example/dataset"]
* </pre>
*/
public static final String ADDRESS_PATH = "path";
/**
* URI entries: {@value}.
* <pre>
* ["http://example.org"]
* </pre>
*/
public static final String ADDRESS_URI = "uri";
/**
* Zookeeper addresses as a triple : {@value}.
* <p>
* These are provide as a 3 element tuple of: hostname, port
* and optionally path (depending on the application)
* <p>
* A single element would be
* <pre>
* ["zk1","2181","/registry"]
* </pre>
* An endpoint with multiple elements would list them as
* <pre>
* [
* ["zk1","2181","/registry"]
* ["zk2","1600","/registry"]
* ]
* </pre>
*
* the third element in each entry , the path, MUST be the same in each entry.
* A client reading the addresses of an endpoint is free to pick any
* of the set, so they must be the same.
*
*/
public static final String ADDRESS_ZOOKEEPER = "zktriple";
/**
* Any other address: {@value}.
*/
public static final String ADDRESS_OTHER = "";
}
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