| /* |
| * 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.accumulo.core.file.streams; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.accumulo.core.util.ratelimit.NullRateLimiter; |
| import org.apache.accumulo.core.util.ratelimit.RateLimiter; |
| import org.apache.hadoop.fs.Seekable; |
| |
| /** |
| * A decorator for an {@code InputStream} which limits the rate at which reads are performed. |
| */ |
| public class RateLimitedInputStream extends FilterInputStream implements Seekable { |
| private final RateLimiter rateLimiter; |
| |
| public <StreamType extends InputStream & Seekable> RateLimitedInputStream(StreamType stream, |
| RateLimiter rateLimiter) { |
| super(stream); |
| this.rateLimiter = rateLimiter == null ? NullRateLimiter.INSTANCE : rateLimiter; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int val = in.read(); |
| if (val >= 0) { |
| rateLimiter.acquire(1); |
| } |
| return val; |
| } |
| |
| @Override |
| public int read(byte[] buffer, int offset, int length) throws IOException { |
| int count = in.read(buffer, offset, length); |
| if (count > 0) { |
| rateLimiter.acquire(count); |
| } |
| return count; |
| } |
| |
| @Override |
| public void seek(long pos) throws IOException { |
| ((Seekable) in).seek(pos); |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return ((Seekable) in).getPos(); |
| } |
| |
| @Override |
| public boolean seekToNewSource(long targetPos) throws IOException { |
| return ((Seekable) in).seekToNewSource(targetPos); |
| } |
| } |