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 */
018
019package org.apache.hadoop.hdfs.server.namenode.ha;
020
021import java.util.concurrent.atomic.AtomicBoolean;
022
023import org.apache.hadoop.io.retry.FailoverProxyProvider;
024
025public abstract class AbstractNNFailoverProxyProvider<T> implements
026    FailoverProxyProvider <T> {
027
028  private AtomicBoolean fallbackToSimpleAuth;
029
030  /**
031   * Inquire whether logical HA URI is used for the implementation. If it is
032   * used, a special token handling may be needed to make sure a token acquired
033   * from a node in the HA pair can be used against the other node.
034   *
035   * @return true if logical HA URI is used. false, if not used.
036   */
037  public abstract boolean useLogicalURI();
038
039  /**
040   * Set for tracking if a secure client falls back to simple auth.  This method
041   * is synchronized only to stifle a Findbugs warning.
042   *
043   * @param fallbackToSimpleAuth - set to true or false during this method to
044   *   indicate if a secure client falls back to simple auth
045   */
046  public synchronized void setFallbackToSimpleAuth(
047      AtomicBoolean fallbackToSimpleAuth) {
048    this.fallbackToSimpleAuth = fallbackToSimpleAuth;
049  }
050
051  public synchronized AtomicBoolean getFallbackToSimpleAuth() {
052    return fallbackToSimpleAuth;
053  }
054}