hudson.util

Class AtomicFileWriter

java.lang.Object

java.io.Writer

hudson.util.AtomicFileWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public class AtomicFileWriter
extends Writer

Buffered FileWriter that supports atomic operations.

The write operation is atomic when used for overwriting; it either leaves the original file intact, or it completely rewrites it with new contents.

Author:

Kohsuke Kawaguchi

Field Summary

Fields inherited from class java.io.Writer

lock

Constructor Summary

Constructors

Constructor and Description
AtomicFileWriter(File f) Writes with UTF-8 encoding.
AtomicFileWriter(File f, String encoding)

Method Summary

Modifier and Type	Method and Description
void	abort() When the write operation failed, call this method to leave the original file intact and remove the temporary file.
void	close()
void	commit()
protected void	finalize()
void	flush()
File	getTemporaryFile() Until the data is committed, this file captures the written content.
void	write(char[] cbuf, int off, int len)
void	write(int c)
void	write(String str, int off, int len)

Methods inherited from class java.io.Writer

append, append, append, write, write

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AtomicFileWriter

public AtomicFileWriter(File f)
                 throws IOException

Writes with UTF-8 encoding.

Throws:

IOException

AtomicFileWriter

public AtomicFileWriter(File f,
                        String encoding)
                 throws IOException

Parameters:

encoding - File encoding to write. If null, platform default encoding is chosen.

Throws:

IOException

Method Detail

write

public void write(int c)
           throws IOException

Overrides:

write in class Writer

Throws:

IOException

write

public void write(String str,
                  int off,
                  int len)
           throws IOException

Overrides:

write in class Writer

Throws:

IOException

write

public void write(char[] cbuf,
                  int off,
                  int len)
           throws IOException

Specified by:

write in class Writer

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class Writer

Throws:

IOException

abort

public void abort()
           throws IOException

When the write operation failed, call this method to leave the original file intact and remove the temporary file. This method can be safely invoked from the "finally" block, even after the commit() is called, to simplify coding.

Throws:

IOException

commit

public void commit()
            throws IOException

Throws:

IOException

finalize

protected void finalize()
                 throws Throwable

Overrides:

finalize in class Object

Throws:

Throwable

getTemporaryFile

public File getTemporaryFile()

Until the data is committed, this file captures the written content.