PaymentWriter.java

/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.batch.integration.samples.payments;

import java.util.List;

import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.integration.samples.payments.model.Payment;
import org.springframework.batch.item.ItemWriter;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.simple.SimpleJdbcInsert;

/**
 * @author Gunnar Hillert
 */
public class PaymentWriter implements ItemWriter<Payment> {

	private static final Log logger = LogFactory.getLog(PaymentWriter.class);

	private SimpleJdbcInsert paymentInsert;
	private JdbcTemplate accountUpdate;

	public PaymentWriter(DataSource dataSource) {
		paymentInsert = new SimpleJdbcInsert(dataSource)
				.withTableName("PAYMENTS")
				.usingColumns("RECIPIENT", "PAYEE", "AMOUNT", "PAY_DATE");
		accountUpdate = new JdbcTemplate(dataSource);
	}

	@Override
	public void write(List<? extends Payment> payments) throws Exception {
		for (Payment payment : payments) {
			MapSqlParameterSource parameterSource = new MapSqlParameterSource();
			parameterSource.addValue("RECIPIENT", payment.getDestinationAccountNo()).addValue("PAYEE", payment.getSourceAccountNo())
					.addValue("AMOUNT", payment.getAmount()).addValue("DATE", payment.getDate());
			accountUpdate.update("UPDATE ACCOUNTS SET BALANCE = BALANCE + ? WHERE ID = ?", payment.getAmount(), payment.getDestinationAccountNo());
			accountUpdate.update("UPDATE ACCOUNTS SET BALANCE = BALANCE - ? WHERE ID = ?", payment.getAmount(), payment.getSourceAccountNo());
			paymentInsert.execute(parameterSource);
			logger.info("Executing step: " + payment);
		}
	}
}