GenericRepositoryServicePattern

GenericService

public interface IAbstarctRepository<T,PK extends Serializable> {
	List<T> getAll();
	T loadByEntityId(PK entityId);
	boolean delete(T entity);
	boolean deleteByEntityId(PK entityId);
	void update(T entity);
	PK saveOrUpdate(T entity);
	boolean save(List<T> entities);
}

public  class AbstarctRepository<T, PK extends Serializable> implements IAbstarctRepository<T, PK> {
    	T loadByEntityId(PK entityId){
        // write code
      }

}

public interface IAbstarctService<T,PK extends Serializable> {
	List<T> getAll();
	T loadByEntityId(PK entityId);
	boolean delete(T entity);
	boolean deleteByEntityId(PK entityId);
	void update(T entity);
	PK saveOrUpdate(T entity);
	boolean save(List<T> entities);
}


public abstract class AbstarctService<T, PK extends Serializable> implements IAbstarctService<T, PK> {
    protected abstract IAbstractRepository<T, PK> getGenericRepo();
    
    	T loadByEntityId(PK entityId){
        getGenericRepo.loadByEntityId(entityId);
      }

}

public interface IPartyRepository  extends IAbstarctRepository<Party,Long> {
  List<Party> findByPartyName(String partyName)
}

public interface PartyRepository  extends AbstarctRepository<Party,Long> implement IPartyRepository{
  List<Party> findByPartyName(String partyName){
    // write codes
  }
}


public interface IPartyService  extends IAbstarctService<Party,Long> {
  List<Party> findByPartyName(String partyName)
}

public interface PartyService  extends AbstarctService<Party,Long> implement IPartyService{
  List<Party> findByPartyName(String partyName){
    // write codes
  }
}