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增加Tailer追踪文件时文件被删除的处理情况

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This commit is contained in:
Looly 2023-05-23 12:34:01 +08:00
parent 731875d62e
commit 357c40a454
2 changed files with 29 additions and 17 deletions
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3
CHANGELOG.md
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@ -2,7 +2,7 @@
# 🚀Changelog
-------------------------------------------------------------------------------------------------------------
# 5.8.19.M1 (2023-05-20)
# 5.8.19.M1 (2023-05-23)
### 🐣新特性
* 【db 】 优化HttpRequest.toString()内容打印（issue#3072@Github）
@ -14,6 +14,7 @@
* 【core 】 SyncFinisher增加setExceptionHandler方法（issue#I716SX@Gitee）
* 【core 】 FileTypeUtil.getType增加文件判断（pr#3112@Github）
* 【core 】 增加CsvWriteConfig.setEndingLineBreak配置项（issue#I75K5G@Gitee）
* 【core 】 增加Tailer追踪文件时文件被删除的处理情况（pr#3115@Github）
### 🐞Bug修复
* 【core 】 修复URLUtil.decode无法解码UTF-16问题（issue#3063@Github）

43
hutool-core/src/main/java/cn/hutool/core/io/file/Tailer.java
View File

@ -6,6 +6,8 @@ import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.io.LineHandler;
import cn.hutool.core.io.watch.SimpleWatcher;
import cn.hutool.core.io.watch.WatchKind;
import cn.hutool.core.io.watch.WatchMonitor;
import cn.hutool.core.lang.Console;
import cn.hutool.core.util.CharUtil;
@ -46,11 +48,10 @@ public class Tailer implements Serializable {
private final long period;
private final String filePath;
private final RandomAccessFile randomAccessFile;
private final ScheduledExecutorService executorService;
private WatchMonitor fileDeleteWatchMonitor;
private boolean stopOnDelete;
/**
* 构造，默认UTF-8编码
@ -104,6 +105,15 @@ public class Tailer implements Serializable {
this.filePath=file.getAbsolutePath();
}
/**
* 设置删除文件后是否退出并抛出异常
*
* @param stopOnDelete 删除文件后是否退出并抛出异常
*/
public void setStopOnDelete(final boolean stopOnDelete) {
this.stopOnDelete = stopOnDelete;
}
/**
* 开始监听
*/
@ -124,25 +134,26 @@ public class Tailer implements Serializable {
throw new IORuntimeException(e);
}
final LineReadWatcher lineReadWatcher = new LineReadWatcher(this.randomAccessFile, this.charset, this.lineHandler){
@Override
public void onDelete(WatchEvent<?> event, Path currentPath) {
super.onDelete(event, currentPath);
Path deletedPath = (Path) event.context();
if (deletedPath.toString().equals(FileUtil.file(filePath).getName())) {
stop();
throw new IORuntimeException("{} has been deleted", filePath);
}
}
};
final LineReadWatcher lineReadWatcher = new LineReadWatcher(this.randomAccessFile, this.charset, this.lineHandler);
final ScheduledFuture<?> scheduledFuture = this.executorService.scheduleAtFixedRate(//
lineReadWatcher, //
0, //
this.period, TimeUnit.MILLISECONDS//
);
fileDeleteWatchMonitor = WatchMonitor.create(this.filePath, WatchMonitor.ENTRY_DELETE);
fileDeleteWatchMonitor.setWatcher(lineReadWatcher);
fileDeleteWatchMonitor.start();
// 监听删除
if(stopOnDelete){
fileDeleteWatchMonitor = WatchMonitor.create(this.filePath, WatchKind.DELETE.getValue());
fileDeleteWatchMonitor.setWatcher(new SimpleWatcher(){
@Override
public void onDelete(final WatchEvent<?> event, final Path currentPath) {
super.onDelete(event, currentPath);
stop();
throw new IORuntimeException("{} has been deleted", filePath);
}
});
fileDeleteWatchMonitor.start();
}
if (false == async) {
try {