package org.cache2k.benchmark.util;
/*
* #%L
* Benchmarks: utilities
* %%
* Copyright (C) 2013 - 2017 headissue GmbH, Munich
* %%
* 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.
* #L%
*/
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.util.PrimitiveIterator;
/**
* Read in scarab trace which is a sequence of longs and map it to integers.
*
* @author Jens Wilke
*/
public class ScarabTraceReader extends AccessPatternAdapter {
public ScarabTraceReader(InputStream in) {
super(
new ObjectToIntegerMapper(
new TraceIterator(
new DataInputStream(
new BufferedInputStream(in)))));
}
private static final class TraceIterator implements PrimitiveIterator.OfLong {
private final DataInputStream input;
private TraceIterator(DataInputStream input) {
this.input = input;
}
@Override
public boolean hasNext() {
try {
input.mark(100);
input.readLong();
input.reset();
return true;
} catch (EOFException e) {
return false;
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
@Override
public long nextLong() {
try {
return input.readLong();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
}
}