001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hdfs;
019
020import java.io.IOException;
021import java.net.InetSocketAddress;
022
023import org.apache.hadoop.hdfs.net.Peer;
024import org.apache.hadoop.hdfs.protocol.DatanodeID;
025import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
026import org.apache.hadoop.security.token.Token;
027
028public interface RemotePeerFactory {
029  /**
030   * @param addr          The address to connect to.
031   * @param blockToken    Token used during optional SASL negotiation
032   * @param datanodeId    ID of destination DataNode
033   * @return              A new Peer connected to the address.
034   *
035   * @throws IOException  If there was an error connecting or creating 
036   *                      the remote socket, encrypted stream, etc.
037   */
038  Peer newConnectedPeer(InetSocketAddress addr,
039      Token<BlockTokenIdentifier> blockToken, DatanodeID datanodeId)
040      throws IOException;
041}