Re: Any suggestions of doing refreshing data in a web module?

From:

lightning <huang.lightning@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 24 Mar 2008 20:57:21 -0700 (PDT)

Message-ID:

<46601308-cf45-4511-ade4-efe744ae04ee@s12g2000prg.googlegroups.com>

Some corrections...:

c = (c+1) % (5 * 60);
and field c is put in IPLookerServlet now.

...

    static String ipRepFile;

    static boolean isRunning = true;
    static int c = 0;
...

On 3=D4 25=C8=D5, =C9=CF=CE=E711=CA=B150=B7=D6, lightning <huang.lightn...=
@gmail.com> wrote:

Some data(xxx.txt) may be updated at some time.
I start a new thread to refresh the data.
Below is the code:

public class IPLookerServlet extends HttpServlet {
        static TreeMap<Long, String> map;

        static ExecutorService s = Executors.newSingleThreadExecutor();

        static String ipRepFile;

        static boolean isRunning = true;

        /**
         * Destruction of the servlet. <br>
         */
        public void destroy() {
                super.destroy(); // Just puts "destroy" string in log
                // Put your code here
                System.out.println("it destroyed!!!!!!!!!!!!!!");
                isRunning = false;
                s.shutdown();
        }

        /**
         * Initialization of the servlet. <br>
         *
         * @throws ServletException
         * if an error occure
         */
        public void init() throws ServletException {
                // Put your code here
                ipRepFile = getInitParameter("ipRepFile");
                try {
                        map = getIPInfo(ipRepFile);
                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }

                                s.execute(new Runnable() {
                        int c = 0;

                        public void run() {
                                // TODO Auto-generated method stub
                                while (isRunning) {
                                        try {
                                                Thread.sleep(1000);
                                                c = (c++) % (30 * 60);//=

every half an hour.

if (c == 0) {
map = getIPInfo(=

ipRepFile);

System.out.println=

("refreshed ip repository");

                                                }
                                        } catch (IOException e) {
                                        } catch (InterruptedException e) {=

                                                // TODO Auto-generated cat=

ch block

                                                e.printStackTrace();
                                        }
                                }
                        }
                });
                               System.out.println("init
complete!!!!!!!!!");

        }

        private static TreeMap<Long, String> getIPInfo(String file) throws=

IOException {
                TreeMap<Long, String> r = new TreeMap<Long, String>();
                BufferedReader in = new BufferedReader(new FileReader(fi=

le));

                                String buf = null;
                Pattern p = Pattern
                                .compile("^(\\d+\\.\\d+\\.\\d+\\.\\d+)\\s+=

(\\d+\\.\\d+\\.\\d+\\.\\d

+)\\s+(.+)");
                while ((buf = in.readLine()) != null) {
                        Matcher m = p.matcher(buf);
                        while (m.find()) {
                                long start = dealDot(m.group(1));
                                r.put(start, m.group(3));
                        }
                }
                in.close();
                return r;
        }
...

}- =D2=FE=B2=D8=B1=BB=D2=FD=D3=C3=CE=C4=D7=D6 -

- =CF=D4=CA=BE=D2=FD=D3=C3=B5=C4=CE=C4=D7=D6 -