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67 lines
2.1 KiB
Java
67 lines
2.1 KiB
Java
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.io;
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import java.io.CharArrayReader;
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import java.io.IOException;
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import java.io.Reader;
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import java.util.List;
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import java.util.Random;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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@State(Scope.Benchmark)
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public class ReaderReadAllLines {
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private char[] chars = null;
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@Setup
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public void setup() throws IOException {
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final int len = 128_000;
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chars = new char[len];
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Random rnd = new Random(System.nanoTime());
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int off = 0;
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while (off < len) {
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int lineLen = 40 + rnd.nextInt(8192);
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if (lineLen > len - off) {
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off = len;
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} else {
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chars[off + lineLen] = '\n';
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off += lineLen;
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}
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}
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}
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@Benchmark
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public List<String> readAllLines() throws IOException {
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List<String> lines;
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try (Reader reader = new CharArrayReader(chars)) {
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lines = reader.readAllLines();
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}
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return lines;
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}
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}
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