Optimizer (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.id.enhanced
Interface Optimizer

All Known Implementing Classes:: OptimizerFactory.OptimizerSupport

public interface Optimizer

Performs optimization on an optimizable identifier generator. Typically this optimization takes the form of trying to ensure we do not have to hit the database on each and every request to get an identifier value.

Optimizers work on constructor injection. They should provide a constructor with the following arguments

java.lang.Class - The return type for the generated values
int - The increment size

Author:: Steve Ebersole

Method Summary

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.

int getIncrementSize()
          Retrieves the defined increment size.

long getLastSourceValue()
          A common means to access the last value obtained from the underlying source.

Method Detail

generate

public Serializable generate(AccessCallback callback)

Generate an identifier value accounting for this specific optimization.

Parameters:: callback - Callback to access the underlying value source.
Returns:: The generated identifier value.

getLastSourceValue

public long getLastSourceValue()

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

Returns:: The last value we obtained from the underlying source; -1 indicates we have not yet consulted with the source.

getIncrementSize

public int getIncrementSize()

Retrieves the defined increment size.

Returns:: The increment size.

applyIncrementSizeToSourceValues

public boolean applyIncrementSizeToSourceValues()

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

Returns:: 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.