/*
* Copyright 2002-2016 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.handler;
import org.springframework.expression.Expression;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
/**
* A {@link org.springframework.messaging.MessageHandler} that evaluates
* the provided {@link Expression} expecting a <b>void return</b>.
*
* @author Artem Bilan
* @author Gary Russell
* @see MethodInvokingMessageHandler
* @since 2.1
*/
public class ExpressionEvaluatingMessageHandler extends AbstractMessageHandler {
private volatile ExpressionEvaluatingMessageProcessor<Void> processor;
private volatile String componentType;
public ExpressionEvaluatingMessageHandler(Expression expression) {
Assert.notNull(expression, "'expression' must not be null");
this.processor = new ExpressionEvaluatingMessageProcessor<Void>(expression, Void.class);
setPrimaryExpression(expression);
}
public void setComponentType(String componentType) {
this.componentType = componentType;
}
@Override
public String getComponentType() {
return this.componentType;
}
@Override
protected void onInit() throws Exception {
this.processor.setBeanFactory(getBeanFactory());
}
@Override
protected void handleMessageInternal(Message<?> message) throws Exception {
this.processor.processMessage(message);
}
}