* Copyright (c) 2014, 2015 Oracle and/or its affiliates. All rights reserved.

 * @bug 8035406 8027295 8035398 8019342 8027959 8048179 8027962

    private enum Level {

        OFF, FINER, FINEST;

        public boolean lessOrEqualTo(Level other) {

            return this.compareTo(other) < 0;

        }

    }

    private class LogMessageWithLevel {

        String message;

        Level level;

        public LogMessageWithLevel(String message, Level level) {

            this.message = message;

            this.level = level;

        }

    };

    private LogMessageWithLevel allLogMessages[] = new LogMessageWithLevel[] {

        // Ext Root Scan

        new LogMessageWithLevel("Thread Roots (ms)", Level.FINEST),

        new LogMessageWithLevel("StringTable Roots (ms)", Level.FINEST),

        new LogMessageWithLevel("Universe Roots (ms)", Level.FINEST),

        new LogMessageWithLevel("JNI Handles Roots (ms)", Level.FINEST),

        new LogMessageWithLevel("ObjectSynchronizer Roots (ms)", Level.FINEST),

        new LogMessageWithLevel("FlatProfiler Roots", Level.FINEST),

        new LogMessageWithLevel("Management Roots", Level.FINEST),

        new LogMessageWithLevel("SystemDictionary Roots", Level.FINEST),

        new LogMessageWithLevel("CLDG Roots", Level.FINEST),

        new LogMessageWithLevel("JVMTI Roots", Level.FINEST),

        new LogMessageWithLevel("CodeCache Roots", Level.FINEST),

        new LogMessageWithLevel("SATB Filtering", Level.FINEST),

        new LogMessageWithLevel("CM RefProcessor Roots", Level.FINEST),

        new LogMessageWithLevel("Wait For Strong CLD", Level.FINEST),

        new LogMessageWithLevel("Weak CLD Roots", Level.FINEST),

        // Redirty Cards

        new LogMessageWithLevel("Redirty Cards", Level.FINER),

        new LogMessageWithLevel("Parallel Redirty", Level.FINEST),

        new LogMessageWithLevel("Redirtied Cards", Level.FINEST),

        // Misc Top-level

        new LogMessageWithLevel("Code Root Purge", Level.FINER),

        new LogMessageWithLevel("String Dedup Fixup", Level.FINER),

        // Free CSet

        new LogMessageWithLevel("Young Free CSet", Level.FINEST),

        new LogMessageWithLevel("Non-Young Free CSet", Level.FINEST),

        // Humongous Eager Reclaim

        new LogMessageWithLevel("Humongous Reclaim", Level.FINER),

        new LogMessageWithLevel("Humongous Register", Level.FINER),

    };

    void checkMessagesAtLevel(OutputAnalyzer output, LogMessageWithLevel messages[], Level level) throws Exception {

        for (LogMessageWithLevel l : messages) {

            if (level.lessOrEqualTo(l.level)) {

                output.shouldNotContain(l.message);

            } else {

                output.shouldContain(l.message);

            }

        }

    }

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

        new TestGCLogMessages().testNormalLogs();

        new TestGCLogMessages().testWithToSpaceExhaustionLogs();

    }

    private void testNormalLogs() throws Exception {

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                                  "-Xmx10M",

                                                                  GCTest.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        checkMessagesAtLevel(output, allLogMessages, Level.OFF);

        output.shouldHaveExitValue(0);

        pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                   "-XX:+UseStringDeduplication",

                                                   "-Xmx10M",

                                                   "-XX:+PrintGCDetails",

                                                   GCTest.class.getName());

        output = new OutputAnalyzer(pb.start());

        checkMessagesAtLevel(output, allLogMessages, Level.FINER);

        pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                   "-XX:+UseStringDeduplication",

                                                   "-Xmx10M",

                                                   "-XX:+PrintGCDetails",

                                                   "-XX:+UnlockExperimentalVMOptions",

                                                   "-XX:G1LogLevel=finest",

                                                   GCTest.class.getName());

        output = new OutputAnalyzer(pb.start());

        checkMessagesAtLevel(output, allLogMessages, Level.FINEST);

        output.shouldHaveExitValue(0);

    }

    LogMessageWithLevel exhFailureMessages[] = new LogMessageWithLevel[] {

        new LogMessageWithLevel("Evacuation Failure", Level.FINER),

        new LogMessageWithLevel("Recalculate Used", Level.FINEST),

        new LogMessageWithLevel("Remove Self Forwards", Level.FINEST),

        new LogMessageWithLevel("Restore RemSet", Level.FINEST),

    };

    private void testWithToSpaceExhaustionLogs() throws Exception {

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                                  "-Xmx32M",

                                                                  "-Xmn16M",

                                                                  "-XX:+PrintGCDetails",

                                                                  GCTestWithToSpaceExhaustion.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        checkMessagesAtLevel(output, exhFailureMessages, Level.FINER);

        output.shouldHaveExitValue(0);

        pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                   "-Xmx32M",

                                                   "-Xmn16M",

                                                   "-XX:+PrintGCDetails",

                                                   "-XX:+UnlockExperimentalVMOptions",

                                                   "-XX:G1LogLevel=finest",

                                                   GCTestWithToSpaceExhaustion.class.getName());

        output = new OutputAnalyzer(pb.start());

        checkMessagesAtLevel(output, exhFailureMessages, Level.FINEST);

        output.shouldHaveExitValue(0);

    }

    static class GCTest {

        private static byte[] garbage;

        public static void main(String [] args) {

            System.out.println("Creating garbage");

            // create 128MB of garbage. This should result in at least one GC

            for (int i = 0; i < 1024; i++) {

                garbage = new byte[128 * 1024];

            }

            System.out.println("Done");

        }

    static class GCTestWithToSpaceExhaustion {

        private static byte[] garbage;

        private static byte[] largeObject;

        public static void main(String [] args) {

            largeObject = new byte[16*1024*1024];

            System.out.println("Creating garbage");

            // create 128MB of garbage. This should result in at least one GC,

            // some of them with to-space exhaustion.

            for (int i = 0; i < 1024; i++) {

                garbage = new byte[128 * 1024];

            }

            System.out.println("Done");

        }