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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.builtins.helper;

import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import javax.management.MBeanServer;

import org.graalvm.nativeimage.VMRuntime;

import com.oracle.truffle.js.runtime.JSConfig;
import com.sun.management.HotSpotDiagnosticMXBean;

public final class HeapDump {

    private HeapDump() {
        // should not be constructed
    }

    // Derived from:
    // https://blogs.oracle.com/sundararajan/entry/programmatically_dumping_heap_from_java
    public static void dump(String fileName, boolean live) throws IOException {
        if (JSConfig.SubstrateVM) {
            dumpSVM(fileName, live);
        } else {
            dumpHotSpot(fileName, live);
        }
    }

    // Substituted by MLE (do not remove)
    private static void dumpSVM(String fileName, boolean live) throws IOException {
        VMRuntime.dumpHeap(fileName, live);
    }

    private static void dumpHotSpot(String fileName, boolean live) throws IOException {
        MBeanServer server = ManagementFactory.getPlatformMBeanServer();
        HotSpotDiagnosticMXBean hotspotMBean = ManagementFactory.newPlatformMXBeanProxy(server, "com.sun.management:type=HotSpotDiagnostic", HotSpotDiagnosticMXBean.class);
        hotspotMBean.dumpHeap(fileName, live);
    }

    public static String defaultDumpName() {
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy_MM_dd-HH_mm_ss");
        LocalDateTime now = LocalDateTime.now();
        return "heapdump-" + dtf.format(now) + ".hprof";
    }
}