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我的应用程序侦听某个目录及其子目录。为了收听目录,我使用JNotify。在目录应用程序上创建新文件时,会检查文件并以某种方式对其进行处理。下面是代码:

import net.contentobjects.jnotify.JNotify;
import net.contentobjects.jnotify.JNotifyListener;

    public class JNotifyDemo {

    public void sample() throws Exception {
        // path to watch
        //String path = System.getProperty("user.home");
        String path = "/folder";
        System.out.println(path);

        // watch mask, specify events you care about,
        // or JNotify.FILE_ANY for all events.
        int mask = JNotify.FILE_CREATED
                | JNotify.FILE_DELETED
                | JNotify.FILE_MODIFIED
                | JNotify.FILE_RENAMED;

        // watch subtree?
        boolean watchSubtree = true;

        // add actual watch
        int watchID = JNotify.addWatch(path, mask, watchSubtree, new Listener());

        // sleep a little, the application will exit if you
        // don't (watching is asynchronous), depending on your
        // application, this may not be required
        Thread.sleep(1000000);

        // to remove watch the watch
        boolean res = JNotify.removeWatch(watchID);
        if (!res) {
            // invalid watch ID specified.
        }
    }

    class Listener implements JNotifyListener {

        public void fileRenamed(int wd, String rootPath, String oldName,
                String newName) {
            print("renamed " + rootPath + " : " + oldName + " -> " + newName);
        }

        public void fileModified(int wd, String rootPath, String name) {
            print("modified " + rootPath + " : " + name);
        }

        public void fileDeleted(int wd, String rootPath, String name) {
            print("deleted " + rootPath + " : " + name);
        }

        public void fileCreated(int wd, String rootPath, String name) {
            print("created " + rootPath + " : " + name);
            //check file whether it is xml or not
            //validate xml
            //do some internal processing of file
            // and do other jobs like inserting into database
        }

        void print(String msg) {
            System.err.println(msg);
        }
    }

    public static void main(String[] args) throws Exception {
        new JNotifyDemo().sample();
    }
}

从代码中可以看出,应用程序每次处理一个文件。有什么建议可以加快这个应用程序的速度,比如使用线程或其他任何东西?

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2 回答 2

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我建议您使用java.nio.file.Pathwhich extendsWatchable接口,它可能会注册到监视服务,以便可以监视更改和事件。

这种事件驱动的方法可以加速您的应用程序。看看例子

Path两者Watchable都包含在 java 7 中。

于 2012-12-14T08:54:09.007 回答
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实际进行了多少处理?请记住,IO 非常慢,除非您的处理需要相当长的时间,否则多线程解决方案将在读取文件时遇到瓶颈。

无论如何,实现并行处理的快速方法是启动一个ExecutorServiceRunnable并以文件路径作为参数提交它。

于 2012-12-14T09:14:31.610 回答