org.fedoraproject.xmvn.utils

Class AtomicFileCounter

java.lang.Object

org.fedoraproject.xmvn.utils.AtomicFileCounter

public class AtomicFileCounter
extends Object

Atomic integer object, which stores its value in a text file.

Author:

Mikolaj Izdebski

Constructor Summary

Constructors

Constructor and Description
AtomicFileCounter(String path) Create an instance of counter.
AtomicFileCounter(String path, int value) Create an instance of counter and set its initial value.

Method Summary

Methods

Modifier and Type	Method and Description
int	getValue() Get value of the counter.
void	setValue(int value) Set value of the counter.
int	tryDecrement() If counter is positive then decrement it.

Methods inherited from class java.lang.Object

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

Constructor Detail

AtomicFileCounter

public AtomicFileCounter(String path)
                  throws IOException

Create an instance of counter.

Parameters:

path - path to the backing file

Throws:

IOException

AtomicFileCounter

public AtomicFileCounter(String path,
                 int value)
                  throws IOException

Create an instance of counter and set its initial value.

Parameters:

path - path to the backing file

value - initial value of the counter

Throws:

IOException

Method Detail

tryDecrement

public int tryDecrement()
                 throws IOException

If counter is positive then decrement it.

Returns:

the initial value of the counter (before decrementing)

Throws:

IOException

getValue

public int getValue()
             throws IOException

Get value of the counter.

Returns:

value of the counter

Throws:

IOException

setValue

public void setValue(int value)
              throws IOException

Set value of the counter.

Parameters:

value - value of the counter

Throws:

IOException