/*
* Copyright 2015-2016 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.aop;
import org.springframework.integration.core.MessageSource;
import org.springframework.integration.util.CompoundTrigger;
import org.springframework.messaging.Message;
import org.springframework.scheduling.Trigger;
import org.springframework.util.Assert;
/**
* An {@link AbstractMessageSourceAdvice} that uses a {@link CompoundTrigger} to adjust
* the poller - when a message is present, the compound trigger's primary trigger is
* used to determine the next poll. When no message is present, the override trigger is
* used.
* <p>
* The poller advised by this class must be configured to use the same
* {@link CompoundTrigger} instance and must <b>not</b> use a task executor.
*
* @author Gary Russell
* @since 4.3
*
*/
public class CompoundTriggerAdvice extends AbstractMessageSourceAdvice {
private final CompoundTrigger compoundTrigger;
private final Trigger override;
public CompoundTriggerAdvice(CompoundTrigger compoundTrigger, Trigger overrideTrigger) {
Assert.notNull(compoundTrigger, "'compoundTrigger' cannot be null");
this.compoundTrigger = compoundTrigger;
this.override = overrideTrigger;
}
@Override
public boolean beforeReceive(MessageSource<?> source) {
return true;
}
@Override
public Message<?> afterReceive(Message<?> result, MessageSource<?> source) {
if (result == null) {
this.compoundTrigger.setOverride(this.override);
}
else {
this.compoundTrigger.setOverride(null);
}
return result;
}
}