/*

 * Copyright (c) 2016, 2018, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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 jdk.jfr.cmd;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.Arrays;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import jdk.jfr.Configuration;

import jdk.jfr.Event;

import jdk.jfr.Recording;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;;

final class ExecuteHelper {

    public static Object[] array;

    static class CustomEvent extends Event {

        int intValue;

        long longValue;

        double doubliValue;

        float floatValue;

        String stringValue;

        Short shortValue;

        boolean booleanValue;

        char charValue;

        double trickyDouble;

    }

    public static OutputAnalyzer run(String... args) {

        String[] array = new String[args.length + 1];

        System.arraycopy(args, 0, array, 1, args.length);

        array[0] = "jdk.jfr.internal.cmd.Execute";

        try {

            return ProcessTools.executeTestJava(array);

        } catch (Exception e) {

            String message = String.format("Caught exception while executing '%s'", Arrays.asList(array));

            throw new RuntimeException(message, e);

        }

    }

    public static void emitCustomEvents() {

        // Custom events with potentially tricky values

        CustomEvent event1 = new CustomEvent();

        event1.trickyDouble = Double.NaN;

        event1.intValue = Integer.MIN_VALUE;

        event1.longValue = Long.MIN_VALUE;

        event1.doubliValue = Double.MIN_VALUE;

        event1.floatValue = Float.MIN_VALUE;

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < 512; i++) {

            sb.append((char) i);

        }

        sb.append("\u2324");

        event1.stringValue = sb.toString();

        event1.shortValue = Short.MIN_VALUE;

        event1.booleanValue = true;

        event1.booleanValue = false;

        event1.charValue = '\b';

        event1.commit();

        CustomEvent event2 = new CustomEvent();

        event2.trickyDouble = Double.NEGATIVE_INFINITY;

        event2.intValue = Integer.MAX_VALUE;

        event2.longValue = Long.MAX_VALUE;

        event2.doubliValue = Double.MAX_VALUE;

        event2.floatValue = Float.MAX_VALUE;

        event2.stringValue = null;

        event2.shortValue = Short.MAX_VALUE;

        event2.booleanValue = false;

        event2.charValue = 0;

        event2.commit();

    }

    public static Path createProfilingRecording() throws Exception {

        Path file = Files.createTempFile("recording", ".jfr");

        // Create a recording with some data

        try (Recording r = new Recording(Configuration.getConfiguration("profile"))) {

            r.start();

            // Allocation event

            array = new Object[1000000];

            array = null;

            // Class loading event etc

            provokeClassLoading();

            // GC events

            System.gc();

            // ExecutionSample

            long t = System.currentTimeMillis();

            while (System.currentTimeMillis() - t < 50) {

                // do nothing

            }

            // Other periodic events, i.e CPU load

            Thread.sleep(1000);

            r.stop();

            r.dump(file);

        }

        return file;

    }

    private static void provokeClassLoading() {

       // Matching a string with regexp

       // is expected to load some classes and generate some VM events

       Pattern p = Pattern.compile("a*b");

       Matcher m = p.matcher("aaaaab");

       m.matches();

    }

}