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java.lang.Objectjava.lang.Thread
org.zkoss.io.FileWatchdog
public class FileWatchdog
File modification monitor thread. It monitors a gving file in a lowest priority thread. Then, if it detects any modification, invokes a giving interface. Note: Callback.onModified is at least called once.
Caller has to implement the FileWatchdog.Callback interface. Then,
new FileWatchdog(filename, 30000, callback).start();
This class is extended from Thread, so you could manipulate it as a normal thread, such as interrupt, suspend, and change priority.
The watchdog executes at the lowest priority, so it won't affect much of the system performance.
Nested Class Summary | |
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static interface |
FileWatchdog.Callback
The interface to implement when using a FileWatchdog. |
Nested classes/interfaces inherited from class java.lang.Thread |
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java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler |
Field Summary |
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Fields inherited from class java.lang.Thread |
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MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY |
Constructor Summary | |
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FileWatchdog(java.io.File file,
long delay,
FileWatchdog.Callback callback)
Constructor. |
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FileWatchdog(java.lang.String filename,
long delay,
FileWatchdog.Callback callback)
Constructor. |
Method Summary | |
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void |
cease()
Stops the thread. |
void |
run()
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void |
start()
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Methods inherited from class java.lang.Thread |
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activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, stop, stop, suspend, toString, yield |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public FileWatchdog(java.io.File file, long delay, FileWatchdog.Callback callback)
file
- the filedelay
- the delay in milliseconds to wait between each checkcallback
- the callbackpublic FileWatchdog(java.lang.String filename, long delay, FileWatchdog.Callback callback)
filename
- the filenamedelay
- the delay in milliseconds to wait between each checkcallback
- the callbackMethod Detail |
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public void start()
start
in class java.lang.Thread
public void cease()
public void run()
run
in interface java.lang.Runnable
run
in class java.lang.Thread
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