/*
* Copyright 2014-2016 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.amqp.rabbit.listener;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.messaging.handler.annotation.support.DefaultMessageHandlerMethodFactory;
import org.springframework.messaging.handler.annotation.support.MessageHandlerMethodFactory;
import org.springframework.util.Assert;
/**
* Helper bean for registering {@link RabbitListenerEndpoint} with
* a {@link RabbitListenerEndpointRegistry}.
*
* @author Stephane Nicoll
* @author Juergen Hoeller
* @author Artem Bilan
* @since 1.4
* @see org.springframework.amqp.rabbit.annotation.RabbitListenerConfigurer
*/
public class RabbitListenerEndpointRegistrar implements BeanFactoryAware, InitializingBean {
private final List<AmqpListenerEndpointDescriptor> endpointDescriptors =
new ArrayList<AmqpListenerEndpointDescriptor>();
private RabbitListenerEndpointRegistry endpointRegistry;
private MessageHandlerMethodFactory messageHandlerMethodFactory;
private RabbitListenerContainerFactory<?> containerFactory;
private String containerFactoryBeanName;
private BeanFactory beanFactory;
private boolean startImmediately;
/**
* Set the {@link RabbitListenerEndpointRegistry} instance to use.
* @param endpointRegistry the {@link RabbitListenerEndpointRegistry} instance to use.
*/
public void setEndpointRegistry(RabbitListenerEndpointRegistry endpointRegistry) {
this.endpointRegistry = endpointRegistry;
}
/**
* @return the {@link RabbitListenerEndpointRegistry} instance for this
* registrar, may be {@code null}.
*/
public RabbitListenerEndpointRegistry getEndpointRegistry() {
return this.endpointRegistry;
}
/**
* Set the {@link MessageHandlerMethodFactory} to use to configure the message
* listener responsible to serve an endpoint detected by this processor.
* <p>By default, {@link DefaultMessageHandlerMethodFactory} is used and it
* can be configured further to support additional method arguments
* or to customize conversion and validation support. See
* {@link DefaultMessageHandlerMethodFactory} javadoc for more details.
* @param rabbitHandlerMethodFactory the {@link MessageHandlerMethodFactory} instance.
*/
public void setMessageHandlerMethodFactory(MessageHandlerMethodFactory rabbitHandlerMethodFactory) {
this.messageHandlerMethodFactory = rabbitHandlerMethodFactory;
}
/**
* @return the custom {@link MessageHandlerMethodFactory} to use, if any.
*/
public MessageHandlerMethodFactory getMessageHandlerMethodFactory() {
return this.messageHandlerMethodFactory;
}
/**
* Set the {@link RabbitListenerContainerFactory} to use in case a {@link RabbitListenerEndpoint}
* is registered with a {@code null} container factory.
* <p>Alternatively, the bean name of the {@link RabbitListenerContainerFactory} to use
* can be specified for a lazy lookup, see {@link #setContainerFactoryBeanName}.
* @param containerFactory the {@link RabbitListenerContainerFactory} instance.
*/
public void setContainerFactory(RabbitListenerContainerFactory<?> containerFactory) {
this.containerFactory = containerFactory;
}
/**
* Set the bean name of the {@link RabbitListenerContainerFactory} to use in case
* a {@link RabbitListenerEndpoint} is registered with a {@code null} container factory.
* Alternatively, the container factory instance can be registered directly:
* see {@link #setContainerFactory(RabbitListenerContainerFactory)}.
* @param containerFactoryBeanName the {@link RabbitListenerContainerFactory} bean name.
* @see #setBeanFactory
*/
public void setContainerFactoryBeanName(String containerFactoryBeanName) {
this.containerFactoryBeanName = containerFactoryBeanName;
}
/**
* A {@link BeanFactory} only needs to be available in conjunction with
* {@link #setContainerFactoryBeanName}.
* @param beanFactory the {@link BeanFactory} instance.
*/
@Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public void afterPropertiesSet() {
registerAllEndpoints();
}
protected void registerAllEndpoints() {
synchronized (this.endpointDescriptors) {
for (AmqpListenerEndpointDescriptor descriptor : this.endpointDescriptors) {
this.endpointRegistry.registerListenerContainer(
descriptor.endpoint, resolveContainerFactory(descriptor));
}
this.startImmediately = true; // trigger immediate startup
}
}
private RabbitListenerContainerFactory<?> resolveContainerFactory(AmqpListenerEndpointDescriptor descriptor) {
if (descriptor.containerFactory != null) {
return descriptor.containerFactory;
}
else if (this.containerFactory != null) {
return this.containerFactory;
}
else if (this.containerFactoryBeanName != null) {
Assert.state(this.beanFactory != null, "BeanFactory must be set to obtain container factory by bean name");
this.containerFactory = this.beanFactory.getBean(
this.containerFactoryBeanName, RabbitListenerContainerFactory.class);
return this.containerFactory; // Consider changing this if live change of the factory is required
}
else {
throw new IllegalStateException("Could not resolve the " +
RabbitListenerContainerFactory.class.getSimpleName() + " to use for [" +
descriptor.endpoint + "] no factory was given and no default is set.");
}
}
/**
* Register a new {@link RabbitListenerEndpoint} alongside the
* {@link RabbitListenerContainerFactory} to use to create the underlying container.
* <p>The {@code factory} may be {@code null} if the default factory has to be
* used for that endpoint.
* @param endpoint the {@link RabbitListenerEndpoint} instance to register.
* @param factory the {@link RabbitListenerContainerFactory} to use.
*/
public void registerEndpoint(RabbitListenerEndpoint endpoint, RabbitListenerContainerFactory<?> factory) {
Assert.notNull(endpoint, "Endpoint must be set");
Assert.hasText(endpoint.getId(), "Endpoint id must be set");
// Factory may be null, we defer the resolution right before actually creating the container
AmqpListenerEndpointDescriptor descriptor = new AmqpListenerEndpointDescriptor(endpoint, factory);
synchronized (this.endpointDescriptors) {
if (this.startImmediately) { // Register and start immediately
this.endpointRegistry.registerListenerContainer(descriptor.endpoint,
resolveContainerFactory(descriptor), true);
}
else {
this.endpointDescriptors.add(descriptor);
}
}
}
/**
* Register a new {@link RabbitListenerEndpoint} using the default
* {@link RabbitListenerContainerFactory} to create the underlying container.
* @param endpoint the {@link RabbitListenerEndpoint} instance to register.
* @see #setContainerFactory(RabbitListenerContainerFactory)
* @see #registerEndpoint(RabbitListenerEndpoint, RabbitListenerContainerFactory)
*/
public void registerEndpoint(RabbitListenerEndpoint endpoint) {
registerEndpoint(endpoint, null);
}
private static final class AmqpListenerEndpointDescriptor {
private final RabbitListenerEndpoint endpoint;
private final RabbitListenerContainerFactory<?> containerFactory;
AmqpListenerEndpointDescriptor(RabbitListenerEndpoint endpoint,
RabbitListenerContainerFactory<?> containerFactory) {
this.endpoint = endpoint;
this.containerFactory = containerFactory;
}
}
}