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Spring Integration JPA Support

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/*
 * Copyright 2002-2012 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.integration.jpa.inbound;

import org.springframework.integration.context.IntegrationObjectSupport;
import org.springframework.integration.core.MessageSource;
import org.springframework.integration.jpa.core.JpaExecutor;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;

/**
 * Polling message source that produces messages from the result of the provided:
 *
 * 
 *     entityClass
 *     JpQl Select Query
 *     Sql Native Query
 *     JpQl Named Query
 *     Sql Native Named Query
 * 
 *
 * After the objects have been polled, it also possibly to either:
 *
 * executes an update after the select possibly to updated the state of selected records
 *
 * 
 *     executes an update (per retrieved object or for the entire payload)
 *     delete the retrieved object
 * 
 *
 * @author Amol Nayak
 * @author Gunnar Hillert
 *
 * @since 2.2
 *
 */
public class JpaPollingChannelAdapter extends IntegrationObjectSupport implements MessageSource