| /** |
| * 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.hadoop.mapred.gridmix; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.IOUtils; |
| |
| /** |
| * For every record consumed, read key + val bytes from the stream provided. |
| */ |
| class ReadRecordFactory extends RecordFactory { |
| |
| /** |
| * Size of internal, scratch buffer to read from internal stream. |
| */ |
| public static final String GRIDMIX_READ_BUF_SIZE = "gridmix.read.buffer.size"; |
| |
| private final byte[] buf; |
| private final InputStream src; |
| private final RecordFactory factory; |
| |
| /** |
| * @param targetBytes Expected byte count. |
| * @param targetRecords Expected record count. |
| * @param src Stream to read bytes. |
| * @param conf Used to establish read buffer size. @see #GRIDMIX_READ_BUF_SIZE |
| */ |
| public ReadRecordFactory(long targetBytes, long targetRecords, |
| InputStream src, Configuration conf) { |
| this(new AvgRecordFactory(targetBytes, targetRecords, conf), src, conf); |
| } |
| |
| /** |
| * @param factory Factory to draw record sizes. |
| * @param src Stream to read bytes. |
| * @param conf Used to establish read buffer size. @see #GRIDMIX_READ_BUF_SIZE |
| */ |
| public ReadRecordFactory(RecordFactory factory, InputStream src, |
| Configuration conf) { |
| this.src = src; |
| this.factory = factory; |
| buf = new byte[conf.getInt(GRIDMIX_READ_BUF_SIZE, 64 * 1024)]; |
| } |
| |
| @Override |
| public boolean next(GridmixKey key, GridmixRecord val) throws IOException { |
| if (!factory.next(key, val)) { |
| return false; |
| } |
| for (int len = (null == key ? 0 : key.getSize()) + val.getSize(); |
| len > 0; len -= buf.length) { |
| IOUtils.readFully(src, buf, 0, Math.min(buf.length, len)); |
| } |
| return true; |
| } |
| |
| @Override |
| public float getProgress() throws IOException { |
| return factory.getProgress(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| IOUtils.cleanup(null, src); |
| factory.close(); |
| } |
| } |