org.apache.hadoop.registry.client.types.AddressTypes.java Source code

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Here is the source code for org.apache.hadoop.registry.client.types.AddressTypes.java

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/*
 * 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 = "";
}