Hooking into or extends the GormInstanceApi methods of the GORM API for Grails

Main class defination

package com.autobill.enhancer

import org.codehaus.groovy.grails.commons.DefaultGrailsDomainClass
import org.codehaus.groovy.grails.orm.hibernate.HibernateDatastore
import org.codehaus.groovy.grails.orm.hibernate.HibernateGormInstanceApi
/**
 * Created by pritom on 17/10/2016.
 */
class MyCustomInstanceApi<D> extends HibernateGormInstanceApi<D> {
    private HibernateGormInstanceApi gormInstanceApi

    MyCustomInstanceApi(HibernateGormInstanceApi gormInstanceApi) {
        super(gormInstanceApi.persistentClass, gormInstanceApi.datastore as HibernateDatastore, gormInstanceApi.classLoader)
        this.gormInstanceApi = gormInstanceApi
    }

    @Override
    D save(D instance) {
        println("Saving-${instance}")
        super.save(instance)
    }

    static void init(servletContext) {
        servletContext.grailsApplication.domainClasses.each { DefaultGrailsDomainClass domainClass ->
            def gormInstanceApi = domainClass.clazz.currentGormInstanceApi()
            domainClass.clazz.setInstanceGormInstanceApi(new MyCustomInstanceApi(gormInstanceApi))
        }
    }
}

And invoke MyCustomInstanceApi.init(servletContext) from Bootstrap.groovy