/*

 * 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.

 *

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package jdk.jfr.jcmd;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;

import java.util.List;

import jdk.test.lib.dcmd.JcmdExecutor;

import jdk.test.lib.dcmd.PidJcmdExecutor;

/*

 * @test TestJcmdLogLevelChange

 * @key jfr

 * @summary Test changing log level

 *

 * @library /test/lib /test/jdk

 *

 * @run main/othervm -Xlog:jfr=info jdk.jfr.jcmd.TestJcmdChangeLogLevel

 */

public class TestJcmdChangeLogLevel {

    public static void main(String[] args) throws Exception {

        final String fileName = "jfr_trace.txt";

        final String findWhat = "[info][jfr] Flight Recorder initialized";

        boolean passed = false;

        JcmdExecutor je = new PidJcmdExecutor();

        je.execute("VM.log output='file=" + fileName + "' what='jfr=info'");

        je.execute("JFR.start duration=1s");

        List<String> lines;

        do {

            try {

                lines = Files.readAllLines(Paths.get(fileName));

            } catch (IOException e) {

                throw new Error(e);

            }

            for (String l : lines) {

                if (l.toString().contains(findWhat)) {

                    passed = true;

                    break;

                }

            }

            if (lines.size() > 100) {

                break; /* did not find it */

            }

        } while(!passed);

        if (!passed) {

            throw new Error("Not found " + findWhat  + " in stream" + lines);

        }

        System.out.println("PASSED");

    }

}