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java.lang.Objectorg.apache.commons.io.input.Tailer
public class Tailer
Simple implementation of the unix "tail -f" functionality.
First you need to create a TailerListener implementation
(TailerListenerAdapter is provided for convenience so that you don't have to
implement every method).
For example:
public class MyTailerListener extends TailerListenerAdapter {
public void handle(String line) {
System.out.println(line);
}
}
TailerListener listener = new MyTailerListener();
Tailer tailer = Tailer.create(file, listener, delay);
TailerListener listener = new MyTailerListener();
Tailer tailer = new Tailer(file, listener, delay);
// stupid executor impl. for demo purposes
Executor executor = new Executor() {
public void execute(Runnable command) {
command.run();
}
};
executor.execute(tailer);
TailerListener listener = new MyTailerListener();
Tailer tailer = new Tailer(file, listener, delay);
Thread thread = new Thread(tailer);
thread.setDaemon(true); // optional
thread.start();
Remember to stop the tailer when you have done with it:
tailer.stop();
TailerListener,
TailerListenerAdapter| Constructor Summary | |
|---|---|
Tailer(File file,
TailerListener listener)
Creates a Tailer for the given file, starting from the beginning, with the default delay of 1.0s. |
|
Tailer(File file,
TailerListener listener,
long delay)
Creates a Tailer for the given file, starting from the beginning. |
|
Tailer(File file,
TailerListener listener,
long delay,
boolean end)
Creates a Tailer for the given file, with a delay other than the default 1.0s. |
|
| Method Summary | |
|---|---|
static Tailer |
create(File file,
TailerListener listener)
Creates and starts a Tailer for the given file, starting at the beginning of the file with the default delay of 1.0s |
static Tailer |
create(File file,
TailerListener listener,
long delay)
Creates and starts a Tailer for the given file, starting at the beginning of the file |
static Tailer |
create(File file,
TailerListener listener,
long delay,
boolean end)
Creates and starts a Tailer for the given file. |
long |
getDelay()
Return the delay. |
File |
getFile()
Return the file. |
void |
run()
Follows changes in the file, calling the TailerListener's handle method for each new line. |
void |
stop()
Allows the tailer to complete its current loop and return. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public Tailer(File file,
TailerListener listener)
file - The file to follow.listener - the TailerListener to use.
public Tailer(File file,
TailerListener listener,
long delay)
file - the file to follow.listener - the TailerListener to use.delay - the delay between checks of the file for new content in milliseconds.
public Tailer(File file,
TailerListener listener,
long delay,
boolean end)
file - the file to follow.listener - the TailerListener to use.delay - the delay between checks of the file for new content in milliseconds.end - Set to true to tail from the end of the file, false to tail from the beginning of the file.| Method Detail |
|---|
public static Tailer create(File file,
TailerListener listener,
long delay,
boolean end)
file - the file to follow.listener - the TailerListener to use.delay - the delay between checks of the file for new content in milliseconds.end - Set to true to tail from the end of the file, false to tail from the beginning of the file.
public static Tailer create(File file,
TailerListener listener,
long delay)
file - the file to follow.listener - the TailerListener to use.delay - the delay between checks of the file for new content in milliseconds.
public static Tailer create(File file,
TailerListener listener)
file - the file to follow.listener - the TailerListener to use.
public File getFile()
public long getDelay()
public void run()
run in interface Runnablepublic void stop()
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