程序包 org.hibernate.id.enhanced

类 PooledOptimizer

java.lang.Object

org.hibernate.id.enhanced.AbstractOptimizer

org.hibernate.id.enhanced.PooledOptimizer

所有已实现的接口:

InitialValueAwareOptimizer, Optimizer

public class PooledOptimizer
extends AbstractOptimizer
implements InitialValueAwareOptimizer

Optimizer which uses a pool of values, storing the next low value of the range in the database.

Note that this optimizer works essentially the same as the HiLoOptimizer except that here the bucket ranges are actually encoded into the database structures.

Note if you prefer that the database value be interpreted as the bottom end of our current range, then use the PooledLoOptimizer strategy

作者:

Steve Ebersole

另请参阅:

PooledLoOptimizer

字段概要

从类继承的字段 org.hibernate.id.enhanced.AbstractOptimizer

incrementSize, returnClass

构造器概要

构造器

构造器	说明
PooledOptimizer(Class returnClass, int incrementSize)	Constructs a PooledOptimizer

方法概要

修饰符和类型	方法	说明
boolean	applyIncrementSizeToSourceValues()	Are increments to be applied to the values stored in the underlying value source?
Serializable	generate(AccessCallback callback)	Generate an identifier value accounting for this specific optimization.
IntegralDataTypeHolder	getLastSourceValue()	A common means to access the last value obtained from the underlying source.
IntegralDataTypeHolder	getLastValue()	Getter for property 'lastValue'.
void	injectInitialValue(long initialValue)	Reports the user specified initial value to the optimizer.

从类继承的方法 org.hibernate.id.enhanced.AbstractOptimizer

getIncrementSize, getReturnClass

从类继承的方法 java.lang.Object

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

构造器详细资料

PooledOptimizer

public PooledOptimizer(Class returnClass,
                       int incrementSize)

Constructs a PooledOptimizer

参数:

returnClass - The Java type of the values to be generated

incrementSize - The increment size.

方法详细资料

generate

public Serializable generate(AccessCallback callback)

从接口复制的说明: Optimizer

Generate an identifier value accounting for this specific optimization. All known implementors are synchronized. Consider carefully if a new implementation could drop this requirement.

指定者:

generate 在接口中 Optimizer

参数:

callback - Callback to access the underlying value source.

返回:

The generated identifier value.

getLastSourceValue

public IntegralDataTypeHolder getLastSourceValue()

从接口复制的说明: Optimizer

A common means to access the last value obtained from the underlying source. This is intended for testing purposes, since accessing the underlying database source directly is much more difficult.

指定者:

getLastSourceValue 在接口中 Optimizer

返回:

The last value we obtained from the underlying source; null indicates we have not yet consulted with the source.

applyIncrementSizeToSourceValues

public boolean applyIncrementSizeToSourceValues()

从接口复制的说明: Optimizer

Are increments to be applied to the values stored in the underlying value source?

指定者:

applyIncrementSizeToSourceValues 在接口中 Optimizer

返回:

True if the values in the source are to be incremented according to the defined increment size; false otherwise, in which case the increment is totally an in memory construct.

getLastValue

public IntegralDataTypeHolder getLastValue()

Getter for property 'lastValue'.

Exposure intended for testing purposes.

返回:

Value for property 'lastValue'.

injectInitialValue

public void injectInitialValue(long initialValue)

从接口复制的说明: InitialValueAwareOptimizer

Reports the user specified initial value to the optimizer.

-1 is used to indicate that the user did not specify.

指定者:

injectInitialValue 在接口中 InitialValueAwareOptimizer

参数:

initialValue - The initial value specified by the user, or -1 to indicate that the user did not specify.