TransactionPostgresManager.java

package io.github.marcopaglio.booking.transaction.manager.postgres;

import io.github.marcopaglio.booking.exception.TransactionException;

import io.github.marcopaglio.booking.repository.factory.ClientRepositoryFactory;

import io.github.marcopaglio.booking.repository.factory.ReservationRepositoryFactory;

import io.github.marcopaglio.booking.repository.postgres.ClientPostgresRepository;

import io.github.marcopaglio.booking.repository.postgres.ReservationPostgresRepository;

import io.github.marcopaglio.booking.transaction.code.ClientReservationTransactionCode;

import io.github.marcopaglio.booking.transaction.code.ClientTransactionCode;

import io.github.marcopaglio.booking.transaction.code.ReservationTransactionCode;

import io.github.marcopaglio.booking.transaction.handler.factory.TransactionHandlerFactory;

import io.github.marcopaglio.booking.transaction.handler.postgres.TransactionPostgresHandler;

import io.github.marcopaglio.booking.transaction.manager.TransactionManager;

import jakarta.persistence.EntityManagerFactory;

import jakarta.persistence.RollbackException;

/**

 * An implementation of {@code TransactionManager} for managing code executed

 * on PostgreSQL within transactions.

 */

public class TransactionPostgresManager extends TransactionManager {

	/**

	 * Specifies that the reason the transaction fails is a commitment failure.

	 */

	private static final String COMMIT_FAILURE = "a commitment failure";

	/**

	 * Used for executing code on {@code ClientRepository} and/or {@code ReservationRepository}

	 * into transactions.

	 * Particularly, it allows to create entity manager, transactions and repositories.

	 */

	private EntityManagerFactory emf;

	/**

	 * Constructs a manager for applying code that uses entity repositories 

	 * using PostgreSQL transactions.

	 * 

	 * @param emf							the entity manager factory used to interact

	 * 										with the persistence provider.

	 * @param transactionHandlerFactory		the factory to create {@code EntityManager} instances.

	 * @param clientRepositoryFactory		the factory to create

	 * 										{@code ClientPostgresRepository} instances.

	 * @param reservationRepositoryFactory	the factory to create

	 * 										{@code ReservationPostgresRepository} instances.

	 */

	public TransactionPostgresManager(EntityManagerFactory emf,

			TransactionHandlerFactory transactionHandlerFactory,

			ClientRepositoryFactory clientRepositoryFactory,

			ReservationRepositoryFactory reservationRepositoryFactory) {

	/**

	 * Prepares to execution of code that involves the {@code ClientRepository}'s method(s)

	 * on PostgreSQL in a single transaction.

	 * 

	 * @param <R>					the returned type of executed code.

	 * @param code					the code to execute.

	 * @return						something depending on execution code.

	 * @throws TransactionException	if the execution or the commitment of the transaction fails.

	 */

	@Override

	public <R> R doInTransaction(ClientTransactionCode<R> code) throws TransactionException {

		try {

		}

	}

	/**

	 * Prepares to execution of code that involves the {@code ReservationRepository}'s method(s)

	 * on PostgreSQL in a single transaction.

	 * 

	 * @param <R>					the returned type of executed code.

	 * @param code					the code to execute.

	 * @return						something depending on execution code.

	 * @throws TransactionException	if the execution or the commitment of the transaction fails.

	 */

	@Override

	public <R> R doInTransaction(ReservationTransactionCode<R> code) throws TransactionException {

		try {

		}

	}

	/**

	 * Prepares to execution of code that involves both {@code ClientRepository}'s and

	 * {@code ReservationRepository}'s methods on PostgreSQL in a single transaction.

	 * 

	 * @param <R>					the returned type of executed code.

	 * @param code					the code to execute.

	 * @return						something depending on execution code.

	 * @throws TransactionException	if the execution or the commitment of the transaction fails.

	 */

	@Override

	public <R> R doInTransaction(ClientReservationTransactionCode<R> code) throws TransactionException {

		try {

		}

	}

}

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