/*
 * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package org.openjdk.bench.java.lang;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.concurrent.TimeUnit;
import java.util.stream.IntStream;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

/**
 * Benchmarks for java.lang.StackTraceElement
 */
@State(value = Scope.Benchmark)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(3)
public class StackTraceElementBench {

    private StackTraceElement element;
    private Throwable throwable;

    @Setup
    public void setup() {
        StackTraceElement[] elements = IntStream.range(0, 500)
                .mapToObj(i -> new StackTraceElement(
                        "classloader" + i,
                        "module" + i,
                        "version" + i,
                        "class" + i,
                        "method" + i,
                        "file" + i + ".java",
                        i))
                .toArray(StackTraceElement[]::new);
        this.element = elements[0];
        this.throwable = new RuntimeException("benchmark") {
            @Override
            public synchronized Throwable fillInStackTrace() {
                setStackTrace(elements);
                return this;
            }
        };
    }

    @Benchmark
    public String toString() {
        return element.toString();
    }

    @Benchmark
    public String printStackTrace() {
        StringWriter sw = new StringWriter();
        throwable.printStackTrace(new PrintWriter(sw));
        return sw.toString();
    }
}