/*
* Copyright 2015 Ben Manes. All Rights Reserved.
*
* Licensed 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 com.github.benmanes.caffeine.cache.simulator.parser.umass.storage;
import java.io.IOException;
import java.math.RoundingMode;
import java.util.List;
import java.util.stream.LongStream;
import com.github.benmanes.caffeine.cache.simulator.parser.TextTraceReader;
import com.google.common.math.IntMath;
/**
* A reader for the trace files provided by the
* <a href="http://traces.cs.umass.edu/index.php/Storage/Storage">UMass Trace Repository</a>.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class StorageTraceReader extends TextTraceReader {
static final int BLOCK_SIZE = 512;
public StorageTraceReader(List<String> filePaths) {
super(filePaths);
}
@Override
public LongStream events() throws IOException {
return lines().flatMapToLong(line -> {
String[] array = line.split(",", 5);
if (array.length <= 4) {
return LongStream.empty();
}
long startBlock = Long.parseLong(array[1]);
int size = Integer.parseInt(array[2]);
int sequence = IntMath.divide(size, BLOCK_SIZE, RoundingMode.UP);
char readWrite = Character.toLowerCase(array[3].charAt(0));
return (readWrite == 'w')
? LongStream.empty()
: LongStream.range(startBlock, startBlock + sequence);
});
}
}