1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.hadoop.fs; 20 21 import java.io.IOException; 22 23 import org.apache.hadoop.classification.InterfaceAudience; 24 import org.apache.hadoop.classification.InterfaceStability; 25 26 @InterfaceAudience.Public 27 @InterfaceStability.Evolving 28 public interface CanSetReadahead { 29 /** 30 * Set the readahead on this stream. 31 * 32 * @param readahead The readahead to use. null means to use the default. 33 * @throws IOException If there was an error changing the dropBehind 34 * setting. 35 * UnsupportedOperationException If this stream doesn't support 36 * setting readahead. 37 */ setReadahead(Long readahead)38 public void setReadahead(Long readahead) 39 throws IOException, UnsupportedOperationException; 40 } 41