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package com.github.lontime.extspring.impl.copper;

import java.sql.Connection;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;

import org.copperengine.core.persistent.txn.DatabaseTransaction;
import org.copperengine.core.persistent.txn.Transaction;
import org.copperengine.core.persistent.txn.TransactionController;

/**
 * Implementation of the {@link TransactionController} interface that internally uses Springs Transaction Management
 *
 * @author austermann
 * @since 1.0
 */
public class SpringTransactionController implements TransactionController {

    private static final Logger logger = LoggerFactory.getLogger(SpringTransactionController.class);

    private DataSource dataSource;
    private PlatformTransactionManager transactionManager;

    public void setTransactionManager(PlatformTransactionManager transactionManager) {
        this.transactionManager = transactionManager;
    }

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    @SuppressWarnings("unchecked")
    @Override
    public  T run(final DatabaseTransaction txn) throws Exception {
        final T[] t = (T[]) new Object[1];
        new SpringTransaction() {
            @Override
            protected void execute(Connection con) throws Exception {
                t[0] = txn.run(con);
            }
        }.run(transactionManager, dataSource, new DefaultTransactionDefinition());
        return t[0];
    }

    @Override
    public  T run(Transaction txn) throws Exception {
        final TransactionStatus txnStatus = transactionManager.getTransaction(new DefaultTransactionDefinition());
        T t = null;
        try {
            t = txn.run();
        } catch (Exception e) {
            logger.error("execution failed - rolling back transaction", e);
            transactionManager.rollback(txnStatus);
            throw e;
        }
        transactionManager.commit(txnStatus);
        return t;
    }

}