Source code

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,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.runtime.yarn.client;
020
021import org.apache.reef.tang.annotations.DefaultImplementation;
022
023/**
024 * Provides security token for setting up YARN container context.
025 */
026@DefaultImplementation(UserCredentialSecurityTokenProvider.class)
027public interface SecurityTokenProvider {
028
029  /**
030   * Returns a ByteBuffer containing security tokens.
031   * @return a ByteBuffer
032   */
033  byte[] getTokens();
034
035  /**
036   * Add serialized tokens to the credentials.
037   * @param tokens ByteBuffer containing tokens.
038   */
039  void addTokens(final byte[] tokens);
040}