/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jfr.internal.tool;

import java.util.Arrays;

import java.util.Deque;

import java.util.LinkedList;

/**

 * Launcher class for the JDK_HOME\bin\jfr tool

 *

 */

public final class Main {

    private static final int EXIT_OK = 0;

    private static final int EXIT_FAILED = 1;

    private static final int EXIT_WRONG_ARGUMENTS = 2;

    public static void main(String... args) {

        Deque<String> argList = new LinkedList<>(Arrays.asList(args));

        if (argList.isEmpty()) {

            System.out.println(Command.title);

            System.out.println();

            System.out.println("Before using this tool, you must have a recording file.");

            System.out.println("A file can be created by starting a recording from command line:");

            System.out.println();

            System.out.println(" java -XX:StartFlightRecording:filename=recording.jfr,duration=30s ... ");

            System.out.println();

            System.out.println("A recording can also be started on already running Java Virtual Machine:");

            System.out.println();

            System.out.println(" jcmd (to list available pids)");

            System.out.println(" jcmd <pid> JFR.start");

            System.out.println();

            System.out.println("Recording data can be dumped to file using the JFR.dump command:");

            System.out.println();

            System.out.println(" jcmd <pid> JFR.dump filename=recording.jfr");

            System.out.println();

            System.out.println("The contents of the recording can then be printed, for example:");

            System.out.println();

            System.out.println(" jfr print recording.jfr");

            System.out.println();

            System.out.println(" jfr print --events CPULoad,GarbageCollection recording.jfr");

            System.out.println();

            System.out.println(" jfr print --json --events CPULoad recording.jfr");

            System.out.println();

            System.out.println(" jfr print --categories \"GC,JVM,Java*\" recording.jfr");

            System.out.println();

            System.out.println(" jfr print --events \"jdk.*\" --stack-depth 64 recording.jfr");

            System.out.println();

            System.out.println(" jfr summary recording.jfr");

            System.out.println();

            System.out.println(" jfr metadata recording.jfr");

            System.out.println();

            System.out.println("For more information about available commands, use 'jfr help'");

            System.exit(EXIT_OK);

        }

        String command = argList.remove();

        for (Command c : Command.getCommands()) {

            if (c.matches(command)) {

                try {

                    c.execute(argList);

                    System.exit(EXIT_OK);

                } catch (UserDataException ude) {

                    System.err.println("jfr " + c.getName() + ": " + ude.getMessage());

                    System.exit(EXIT_FAILED);

                } catch (UserSyntaxException use) {

                    System.err.println("jfr " + c.getName() + ": " + use.getMessage());

                    System.err.println();

                    System.err.println("Usage:");

                    System.err.println();

                    c.displayUsage(System.err);

                    System.exit(EXIT_WRONG_ARGUMENTS);

                } catch (Throwable e) {

                    System.err.println("jfr " + c.getName() + ": unexpected internal error, " + e.getMessage());

                    e.printStackTrace();

                    System.exit(EXIT_FAILED);

                }

            }

        }

        System.err.println("jfr: unknown command '" + command + "'");

        System.err.println();

        System.err.println("List of available commands:");

        System.err.println();

        Command.displayAvailableCommands(System.err);

        System.exit(EXIT_WRONG_ARGUMENTS);

    }

}