org.springframework.integration.endpoint.MessageSourcePollingTemplate Maven / Gradle / Ivy
/*
* Copyright 2018-2019 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
*
* https://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.endpoint;
import org.springframework.integration.StaticMessageHeaderAccessor;
import org.springframework.integration.acks.AckUtils;
import org.springframework.integration.acks.AcknowledgmentCallback;
import org.springframework.integration.core.MessageSource;
import org.springframework.integration.support.utils.IntegrationUtils;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.util.Assert;
/**
* A {@link PollingOperations} used to ad-hoc poll a {@link MessageSource}.
* If the source supports deferred acknowledgment, it will be ACCEPTed
* or REJECTed if necessary.
*
* @author Gary Russell
*
* @since 5.0.1
*
*/
public class MessageSourcePollingTemplate implements PollingOperations {
private final MessageSource source;
public MessageSourcePollingTemplate(MessageSource source) {
Assert.notNull(source, "'source' cannot be null");
this.source = source;
}
@Override
public boolean poll(MessageHandler handler) {
Assert.notNull(handler, "'handler' cannot be null");
Message message = this.source.receive();
if (message != null) {
AcknowledgmentCallback ackCallback = StaticMessageHeaderAccessor.getAcknowledgmentCallback(message);
try {
handler.handleMessage(message);
AckUtils.autoAck(ackCallback);
}
catch (Exception e) {
AckUtils.autoNack(ackCallback);
throw IntegrationUtils.wrapInHandlingExceptionIfNecessary(message,
() -> "error occurred during handling message in 'MessageSourcePollingTemplate' ["
+ this + "]", e);
}
return true;
}
return false;
}
}