/*

 * 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

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 */

package jdk.jfr.internal;

import jdk.jfr.internal.SecuritySupport.SafePath;

import sun.misc.Unsafe;

/**

 * Options that control Flight Recorder.

 *

 * Can be set using JFR.configure

 *

 */

public final class Options {

    private final static JVM jvm = JVM.getJVM();

    private final static long WAIT_INTERVAL = 1000; // ms;

    private final static long MIN_MAX_CHUNKSIZE = 1024 * 1024;

    private static final long DEFAULT_GLOBAL_BUFFER_COUNT = 20;

    private static final long DEFAULT_GLOBAL_BUFFER_SIZE = 524288;

    private static final long DEFAULT_MEMORY_SIZE = DEFAULT_GLOBAL_BUFFER_COUNT * DEFAULT_GLOBAL_BUFFER_SIZE;

    private static long DEFAULT_THREAD_BUFFER_SIZE;

    private static final int DEFAULT_STACK_DEPTH = 64;

    private static final boolean DEFAULT_SAMPLE_THREADS = true;

    private static final long DEFAULT_MAX_CHUNK_SIZE = 12 * 1024 * 1024;

    private static final SafePath DEFAULT_DUMP_PATH = SecuritySupport.USER_HOME;

    private static long memorySize;

    private static long globalBufferSize;

    private static long globalBufferCount;

    private static long threadBufferSize;

    private static int stackDepth;

    private static boolean sampleThreads;

    private static long maxChunkSize;

    private static SafePath dumpPath;

    static {

        final long pageSize = Unsafe.getUnsafe().pageSize();

        DEFAULT_THREAD_BUFFER_SIZE = pageSize > 8 * 1024 ? pageSize : 8 * 1024;

        reset();

    }

    public static synchronized void setMaxChunkSize(long max) {

        if (max < MIN_MAX_CHUNKSIZE) {

            throw new IllegalArgumentException("Max chunk size must be at least " + MIN_MAX_CHUNKSIZE);

        }

        jvm.setFileNotification(max);

        maxChunkSize = max;

    }

    public static synchronized long getMaxChunkSize() {

        return maxChunkSize;

    }

    public static synchronized void setMemorySize(long memSize) {

        jvm.setMemorySize(memSize);

        memorySize = memSize;

    }

    public static synchronized long getMemorySize() {

        return memorySize;

    }

    public static synchronized void setThreadBufferSize(long threadBufSize) {

        jvm.setThreadBufferSize(threadBufSize);

        threadBufferSize = threadBufSize;

    }

    public static synchronized long getThreadBufferSize() {

        return threadBufferSize;

    }

    public static synchronized long getGlobalBufferSize() {

        return globalBufferSize;

    }

    public static synchronized void setGlobalBufferCount(long globalBufCount) {

        jvm.setGlobalBufferCount(globalBufCount);

        globalBufferCount = globalBufCount;

    }

    public static synchronized long getGlobalBufferCount() {

        return globalBufferCount;

    }

    public static synchronized void setGlobalBufferSize(long globalBufsize) {

        jvm.setGlobalBufferSize(globalBufsize);

        globalBufferSize = globalBufsize;

    }

    public static synchronized void setDumpPath(SafePath path) {

        dumpPath = path;

    }

    public static synchronized SafePath getDumpPath() {

        return dumpPath;

    }

    public static synchronized void setStackDepth(Integer stackTraceDepth) {

        jvm.setStackDepth(stackTraceDepth);

        stackDepth = stackTraceDepth;

    }

    public static synchronized int getStackDepth() {

        return stackDepth;

    }

    public static synchronized void setSampleThreads(Boolean sample) {

        jvm.setSampleThreads(sample);

        sampleThreads = sample;

    }

    public static synchronized boolean getSampleThreads() {

        return sampleThreads;

    }

    private static synchronized void reset() {

        setMaxChunkSize(DEFAULT_MAX_CHUNK_SIZE);

        setMemorySize(DEFAULT_MEMORY_SIZE);

        setGlobalBufferSize(DEFAULT_GLOBAL_BUFFER_SIZE);

        setGlobalBufferCount(DEFAULT_GLOBAL_BUFFER_COUNT);

        setDumpPath(DEFAULT_DUMP_PATH);

        setSampleThreads(DEFAULT_SAMPLE_THREADS);

        setStackDepth(DEFAULT_STACK_DEPTH);

        setThreadBufferSize(DEFAULT_THREAD_BUFFER_SIZE);

    }

    static synchronized long getWaitInterval() {

        return WAIT_INTERVAL;

    }

    static void ensureInitialized() {

        // trigger clinit which will setup JVM defaults.

    }

}