我有一个代码可以在值超过阈值时创建警报,并希望该代码每5秒在后台运行一次。
这是我的代码:
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String Name = request.getParameter("alarmName");
String Description = request.getParameter("desc");
String Metric = request.getParameter("name");
String threshold = request.getParameter("threshold");
String sign = request.getParameter("sign");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// List<String> lst = new ArrayList<String>();
System.out.println("Hello" +Name);
System.out.println(Description);
System.out.println(Metric);
System.out.println(threshold);
System.out.println(sign);
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","123");
PreparedStatement ps = con.prepareStatement("Insert into alarmdetails(Name, Description, Metric, threshold,sign) values(?,?,?,?,?)");
System.out.println(ps);
ps.setString(1,Name);
ps.setString(2,Description);
ps.setString(3,Metric);
ps.setString(4,threshold);
ps.setString(5,sign);
ps.executeUpdate();
if(Metric.equals("cpuUsage"))
{
if(sign.equals("greaterthan"))
{
System.out.println("reached here3");
PreparedStatement ps1 = con.prepareStatement("select CPU_USAGE from metrics WHERE CPU_USAGE > (SELECT threshold from alarmdetails WHERE Name='"+Name+"')");
ResultSet rs1 = ps1.executeQuery();
if(rs1.next())
{
System.out.println("Alert, CPU Usage greater than threshold");
}
else
{
System.out.println("All good");
}
}
} catch (Exception e)
{
System.out.println(e);
}
String url = "Homepage.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(url);
dispatcher.forward(request, response);
}
}
我想在一个每5秒运行一次的线程中运行if(Metric.equals(cpuUsage))....
中的代码。
我以前没有自己实现过线程,任何帮助都会非常感激。感谢。
答案 0 :(得分:3)
尝试使用具有指定延迟的ScheduledExecutorService。
function ProjectFolder() {
this.files = [];
Object.defineProperty(this, 'size', {enumerable: true, get: function() {
return this.files.length;
}});
}
function GithubProjectFolder() {
this.files = ['.gitignore', 'README.md'];
}
GithubProjectFolder.prototype = new ProjectFolder();
var project1 = new ProjectFolder();
JSON.stringify(project1);
// output: {"files":[],"size":0}
// size is present
var project = new GithubProjectFolder();
JSON.stringify(project);
// output: {"files":[".gitignore","README.md"]}
// size is absent
这里,MyRunnable类会实现Runnable,它的run方法会有你的处理代码,而不用担心时间延迟。