#!/bin/bash

# 设置抓取次数计数器
capture_count=0

# 获取Java进程的PID
pid=$(pgrep -f "java")
while [ $capture_count -lt 5 ]; do
    # 定义文件名
    output_file="capture_$capture_count.txt"

    # 获取当前CPU使用率
    #cpu_usage=$(top -bn 1 | grep "Cpu(s)" | awk '{print $2 + $4}')
    cpu_usage=$(top -b -n 1 -p $pid | grep $pid | awk '{print $9}')
    # 获取当前时间
    current_time=$(date +"%Y-%m-%d %H:%M:%S") 
    # 判断CPU使用率是否超过90%
    # 浮点转数值
    cpu_usage=$(awk "BEGIN{printf \"%.0f\", $cpu_usage}")
    if [ $(expr "$cpu_usage" ">" 1400) -eq 1 ]; then
        echo "High CPU usage detected: $cpu_usage%"
        
        # 获取所有正在运行的Java进程的PID
        java_pids=$(pgrep -fl "java" | awk '{print $1}')
        # 抓取每个Java进程的堆栈信息
        for pid in $java_pids; do
            jstack_output=$(jstack $pid)
            echo "$current_time $jstack_output" > "$output_file"
            echo "JVM Stack for PID $pid (Capture $capture_count):"
        done
        
        # 增加抓取次数计数器
        capture_count=$((capture_count + 1))
    else
        echo "CPU usage: $current_time $cpu_usage%"
    fi
    
    sleep 1
done