69 lines
2.4 KiB
Java
69 lines
2.4 KiB
Java
/*
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* Copyright (c) 2023, 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.jdk.classfile;
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import java.io.IOException;
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import java.net.URI;
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import java.nio.file.FileSystems;
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import java.nio.file.Files;
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import java.util.Iterator;
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import java.util.ArrayList;
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import java.util.List;
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import java.lang.classfile.ClassModel;
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import java.lang.classfile.ClassFile;
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import java.lang.classfile.components.ClassPrinter;
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import org.openjdk.jmh.annotations.*;
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@BenchmarkMode(Mode.Throughput)
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@State(Scope.Benchmark)
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@Fork(value = 1, jvmArgs = {
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"--enable-preview"})
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@Warmup(iterations = 3)
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@Measurement(iterations = 4)
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public class RepeatedModelTraversal {
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List<ClassModel> models;
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Iterator<ClassModel> it;
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@Setup(Level.Trial)
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public void setup() throws IOException {
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models = new ArrayList<>();
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var cc = ClassFile.of();
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Files.walk(FileSystems.getFileSystem(URI.create("jrt:/")).getPath("modules/java.base/java/util")).forEach(p -> {
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if (Files.isRegularFile(p) && p.toString().endsWith(".class")) try {
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var clm = cc.parse(p);
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models.add(clm);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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});
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}
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@Benchmark
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public void traverseModel() {
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if (it == null || !it.hasNext())
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it = models.iterator();
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ClassPrinter.toTree(it.next(), ClassPrinter.Verbosity.TRACE_ALL);
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}
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}
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