watchservice

JAVA 7 watch service

由 こ雲淡風輕ζ 提交于 2019-12-12 12:37:31
问题 How can I have the watch service process any files that are in the directory on when the application starts up? I already have the application running, but I noticed that only new files that are dropped in the directory are processed but files that were there from the start are ignored. 回答1: I have the same use case here and I am surprised that I did not find much useful online for such common scenario. I see some problems on the below approach. Let's say we utilize the walkTree method to

How do I unregister a directory from Java watchservice?

由 送分小仙女□ 提交于 2019-12-11 02:08:42
问题 I registered a folder to my watchService: path.register(watchService, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY); Later on, I want to cancel this registration. I know that I somehow need to tell the watchService which WatchKey I want to cancel. What's the correct function to accomplish this? 回答1: You have the information in the Watchable interface javadoc that provides the method to register a Watchable object (such as a Path instance) public interface Watchable This interface defines the

In a WatchService, what happens between key.pollEvents() and key.reset()?

由 谁说我不能喝 提交于 2019-12-10 19:02:05
问题 Looking at this Java example, about the key state, Oracle says: Ready indicates that the key is ready to accept events. When first created, a key is in the ready state. Signaled indicates that one or more events are queued. Once the key has been signaled, it is no longer in the ready state until the reset method is invoked. In WatchKey javadoc: Events detected while the key is in the signaled state are queued but do not cause the key to be re-queued for retrieval from the watch service The

Java WatchService doesn't work on some folders

由 最后都变了- 提交于 2019-12-10 12:18:02
问题 I want to use Java 7 WatchService to monitor /proc folder, but that's not working (changes made in the folder are not reported). I've tested other folders such as /home/user/Desktop and /tmp and it works. What could be the reason? Is it because of permissions? /proc is obviously owned by root whereas the other folder is owned by logged in user. The /tmp however is also owned by root, but it works. I'm using this basic implementation to test it. My OS is Ubuntu 13.10 64bit. Oracle Java 1.7.0

java7 WatchServiceDemo 文件系统监控

由 旧城冷巷雨未停 提交于 2019-12-10 03:33:14
自己想搞点东西，发现一个java7的新特性蛮好用的，找了一个damo，贴出来希望能帮助到有需要的人。 package com.wanzi.core; import static java.nio.file.StandardWatchEventKinds.ENTRY_CREATE; import static java.nio.file.StandardWatchEventKinds.ENTRY_DELETE; import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY; import java.io.IOException; import java.nio.file.FileSystems; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.WatchEvent; import java.nio.file.WatchEvent.Kind; import java.nio.file.WatchKey; import java.nio.file.WatchService; public class JavaWatchServiceDemo { private Path path = null; private

Java Watch Service : Not Working for Remote Files mounted in the local Server

由 主宰稳场 提交于 2019-12-07 11:42:04
问题 I have Java program monitoring a remote folder mounted in my local server. But it is not detecting any changes / modification whenever something changed in the remote folder. It is working fine if the changes / modification is made in the mounted folder. Searching through net, as mention in the Java docs If a watched file is not located on a local storage device then it is implementation specific if changes to the file can be detected. In particular, it is not required that changes to files

How to watch file for new content and retrieve that content

由 China☆狼群 提交于 2019-12-06 05:48:21
I have a file with name foo.txt . This file contains some text. I want to achieve following functionality: I launch program write something to the file (for example add one row: new string in foo.txt ) I want to get ONLY NEW content of this file. Can you clarify the best solution of this problem? Also I want resolve related issues: in case if I modify foo.txt I want to see diff. The closest tool which I found in Java is WatchService but if I understood right this tool can only detect type of event happened on filesystem (create file or delete or modify). Java Diff Utils is designed for that

Java Watch Service : Not Working for Remote Files mounted in the local Server

由 橙三吉。 提交于 2019-12-05 13:54:41
I have Java program monitoring a remote folder mounted in my local server. But it is not detecting any changes / modification whenever something changed in the remote folder. It is working fine if the changes / modification is made in the mounted folder. Searching through net, as mention in the Java docs If a watched file is not located on a local storage device then it is implementation specific if changes to the file can be detected. In particular, it is not required that changes to files carried out on remote systems be detected. Anyone could help provide me sample on how to do this? below

Releasing resources of Java 7 WatchService

由 怎甘沉沦 提交于 2019-12-05 08:28:11
I am using Java 7 WatchService to watch directories. I constantly change which directories i am watching. I run into the exception: java.io.IOException: The network BIOS command limit has been reached. after 50 directories. I am certain i call close() on each WatchService i create before creating a new one. Does anyone know the proper way to release a WatchService so you do not run into this limit? Thanks, Dave I think that all you need to do is close() the service. I know you said that you think that you do this already, but I suspect that you are missing some. For instance, you could be

Java NIO watch Service created both 'ENTRY_CREATE' and 'ENTRY_MODIFY' when a new File is added to the watch folder

由 我们两清 提交于 2019-12-05 03:35:59
I see a strange behaviour ( not sure i this is expected behaviour ) using java.nio.file.WatchService. The problem is I have a folder registered with WatchService. When I copy a new file into this folder, then two WatchEvent get generated, one each for : 'ENTRY_CREATE' and 'ENTRY_MODIFY'. As far as I understand, a new file ( copied from other directory which is not getting watched) must create only one event, i.e : 'ENTRY_CREATE'. Can anybody explain why the extra event 'ENTRY_MODIFY' gets created ? My code: public void watch() { WatchKey key = watcher.poll(); //log.info("Watcher scheduler
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