001/*
002 * Copyright 2012-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.batch.item.amqp;
018
019import org.apache.commons.logging.Log;
020import org.apache.commons.logging.LogFactory;
021import org.springframework.amqp.core.AmqpTemplate;
022import org.springframework.batch.item.ItemWriter;
023import org.springframework.util.Assert;
024
025import java.util.List;
026
027/**
028 * <p>
029 * AMQP {@link ItemWriter} implementation using an {@link AmqpTemplate} to
030 * send messages. Messages will be sent to the nameless exchange if not specified
031 * on the provided {@link AmqpTemplate}.
032 * </p>
033 *
034 * @author Chris Schaefer
035 * @author Mahmoud Ben Hassine
036 */
037public class AmqpItemWriter<T> implements ItemWriter<T> {
038    private final AmqpTemplate amqpTemplate;
039    private final Log log = LogFactory.getLog(getClass());
040
041    public AmqpItemWriter(final AmqpTemplate amqpTemplate) {
042        Assert.notNull(amqpTemplate, "AmqpTemplate must not be null");
043
044        this.amqpTemplate = amqpTemplate;
045    }
046
047    @Override
048    public void write(final List<? extends T> items) throws Exception {
049        if (log.isDebugEnabled()) {
050            log.debug("Writing to AMQP with " + items.size() + " items.");
051        }
052
053        for (T item : items) {
054            amqpTemplate.convertAndSend(item);
055        }
056    }
057}