# 设置参数
$DumpDir = "C:\gcDump\dump"
$CpuThreshold = 80
$LogFile = "C:\gcDump\log\monitor_log.txt"

# 循环监控 Java 进程
while ($true) {
    # 获取当前时间
    $CurrentTime = Get-Date -Format "yyyy-MM-dd HH:mm:ss.fff"
    Write-Output "当前时间: $CurrentTime"

    # 获取所有 Java 进程的 PID
    $Pids = Get-WmiObject Win32_Process -Filter "Name='java.exe'" | Select-Object -ExpandProperty ProcessId

    foreach ($JavaProcessId in $Pids) {
        # 获取进程的 CPU 使用率
        $Process = Get-WmiObject Win32_PerfFormattedData_PerfProc_Process | Where-Object { $_.IDProcess -eq $JavaProcessId }
        if ($Process) {
            $CpuUsage = $Process.PercentProcessorTime
            Write-Output "检测 PID $JavaProcessId... 当前 CPU 使用率: $CpuUsage%"
            Add-Content -Path $LogFile -Value "检测 PID $JavaProcessId... 当前 CPU 使用率: $CpuUsage%"

            # 如果 CPU 使用率超过阈值，则生成线程转储文件
            if ($CpuUsage -gt $CpuThreshold) {
                $Timestamp = Get-Date -Format "yyyyMMddHHmmss"
                
                # 获取 PID 使用资源最高的线程 ID
                $ThreadIdHex = & jstack -l $JavaProcessId | Select-String -Pattern 'nid=0x' | Select-Object -First 1 -ExpandProperty Line
                if ($ThreadIdHex) {
                    $ThreadIdHex = $ThreadIdHex.Trim() -replace '^.*nid=0x', ''
                    $ThreadIdHex = $ThreadIdHex.Split()[0]
                } else {
                    $ThreadIdHex = "unknown"
                }

                $DumpFile = "$DumpDir\threaddump_${JavaProcessId}_${Timestamp}_${ThreadIdHex}.txt"
                Write-Output "准备创建线程转储文件 $DumpFile..."
                & jstack -l $JavaProcessId > $DumpFile
                if ($LASTEXITCODE -ne 0) {
                    Write-Output "线程转储创建失败，错误码: $LASTEXITCODE"
                    Add-Content -Path $LogFile -Value "线程转储创建失败，错误码: $LASTEXITCODE"
                } else {
                    Write-Output "Thread dump created for PID $JavaProcessId at $DumpFile"
                    Add-Content -Path $LogFile -Value "Thread dump created for PID $JavaProcessId at $DumpFile"
                }
            }
        }
    }

    Start-Sleep -Seconds 2  # 每分钟检查一次
}