org.hibernate.id.enhanced.Optimizer Maven / Gradle / Ivy
package org.hibernate.id.enhanced;
import java.io.Serializable;
/**
* 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
*/
public interface Optimizer {
/**
* Generate an identifier value accounting for this specific optimization.
*
* @param callback Callback to access the underlying value source.
* @return The generated identifier value.
*/
public Serializable generate(AccessCallback callback);
/**
* 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.
*
* @return The last value we obtained from the underlying source;
* -1 indicates we have not yet consulted with the source.
*/
public long getLastSourceValue();
/**
* Retrieves the defined increment size.
*
* @return The increment size.
*/
public int getIncrementSize();
/**
* Are increments to be applied to the values stored in the underlying
* value source?
*
* @return 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.
*/
public boolean applyIncrementSizeToSourceValues();
}