net.sf.jabb.util.stat

Class AtomicMinLong

java.lang.Object

net.sf.jabb.util.stat.AtomicMinLong

public class AtomicMinLong
extends Object

It stores the minimum value; the compare-and-change procedure is synchronized so that multi-thread safe is ensured.
存放最小值，“比较然后交换”的过程是同步的，所以它是多线程安全的。

Field Summary

Fields

Modifier and Type	Field and Description
protected Object	updateLock
protected long	value

Constructor Summary

Constructors

Constructor and Description
AtomicMinLong() Constructs an instance to store the minimum value. 创建一个实例，用来保存最小值。

Method Summary

Modifier and Type	Method and Description
long	get() getCurrent value. 获得当前值。
long	getAndMin(long newValue) Compare a value with current minimal value and make the less one the new minimum value; Old minimum value before comparison is returned. 拿一个值同当前值比较，把其中小的那个设置为新的最小值，返回比较之前的旧的最小值。
int	intValue() getCurrent value as int. 以int类型获得当前值。
long	longValue() getCurrent value. 获得当前值。
void	min(long newValue) Compare a value with current minimum value and make the less one the new minimum value. 拿一个值同当前值比较，把其中小的那个设置为新的最小值。
long	minAndGet(long newValue) Compare a value with current minimal value and make the less one the new minimum value; New minimum value after comparison is returned. 拿一个值同当前值比较，把其中小的那个设置为新的最小值，返回比较之后的新的最小值。
void	reset() Reset to initial status. 回复到初始状态。
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

value

protected long value

updateLock

protected Object updateLock

Constructor Detail

AtomicMinLong

public AtomicMinLong()

Constructs an instance to store the minimum value.
创建一个实例，用来保存最小值。

Method Detail

minAndGet

public long minAndGet(long newValue)

Compare a value with current minimal value and make the less one the new minimum value; New minimum value after comparison is returned.
拿一个值同当前值比较，把其中小的那个设置为新的最小值，返回比较之后的新的最小值。

Parameters:

newValue - 拿来作比较的值。

Returns:

New minimum value after comparison
比较之后的新的最小值

getAndMin

public long getAndMin(long newValue)

Compare a value with current minimal value and make the less one the new minimum value; Old minimum value before comparison is returned.
拿一个值同当前值比较，把其中小的那个设置为新的最小值，返回比较之前的旧的最小值。

Parameters:

newValue - 拿来作比较的值。

Returns:

Old minimum value before comparison
比较之前的旧的最小值

min

public void min(long newValue)

Compare a value with current minimum value and make the less one the new minimum value.
拿一个值同当前值比较，把其中小的那个设置为新的最小值。

Parameters:

newValue - 拿来作比较的值。

reset

public void reset()

Reset to initial status.
回复到初始状态。

get

public long get()

getCurrent value.
获得当前值。

Returns:

Current value.

longValue

public long longValue()

getCurrent value.
获得当前值。

Returns:

Current value.

intValue

public int intValue()

getCurrent value as int.
以int类型获得当前值。

Returns:

Current value as int.

toString

public String toString()

Overrides:

toString in class Object