org.springframework.batch.support.transaction
Class TransactionAwareBufferedWriter

java.lang.Object
  java.io.Writer
      org.springframework.batch.support.transaction.TransactionAwareBufferedWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

public class TransactionAwareBufferedWriter
extends Writer

Wrapper for a Writer that delays actually writing to or closing the buffer if a transaction is active. If a transaction is detected on the call to Writer.write(String) the parameter is buffered and passed on to the underlying writer only when the transaction is committed.

Author:

Dave Syer

Field Summary

Fields inherited from class java.io.Writer

lock

Constructor Summary

TransactionAwareBufferedWriter(Writer writer, Runnable closeCallback)
Create a new instance with the underlying writer provided, and a callback to execute on close.

Method Summary

void	close()
void	flush()
long	getBufferSize() Convenience method for clients to determine if there is any unflushed data.
void	write(char[] cbuf, int off, int len)

Methods inherited from class java.io.Writer

append, append, append, write, write, write, write

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionAwareBufferedWriter

public TransactionAwareBufferedWriter(Writer writer,
                                      Runnable closeCallback)

Create a new instance with the underlying writer provided, and a callback to execute on close. The callback should clean up related resources like output streams or channels.

Parameters:

writer - actually writes to output

closeCallback - callback to execute on close

Method Detail

getBufferSize

public long getBufferSize()

Convenience method for clients to determine if there is any unflushed data.

Returns:

the current size of unflushed buffered data

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close 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

write

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

Specified by:

write in class Writer

Throws:

IOException