Source code
package org.springframework.jms.config;
import java.util.ArrayList;
import java.util.List;
import org.jspecify.annotations.Nullable;
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 JmsListenerEndpoint} with a {@link JmsListenerEndpointRegistry}.
*
* @author Stephane Nicoll
* @author Juergen Hoeller
* @since 4.1
* @see org.springframework.jms.annotation.JmsListenerConfigurer
*/
public class JmsListenerEndpointRegistrar implements BeanFactoryAware, InitializingBean {
private @Nullable JmsListenerEndpointRegistry endpointRegistry;
private @Nullable MessageHandlerMethodFactory messageHandlerMethodFactory;
private @Nullable JmsListenerContainerFactory<?> containerFactory;
private @Nullable String containerFactoryBeanName;
private @Nullable BeanFactory beanFactory;
private final List<JmsListenerEndpointDescriptor> endpointDescriptors = new ArrayList<>();
private boolean startImmediately;
/**
* Set the {@link JmsListenerEndpointRegistry} instance to use.
*/
public void setEndpointRegistry(@Nullable JmsListenerEndpointRegistry endpointRegistry) {
this.endpointRegistry = endpointRegistry;
}
/**
* Return the {@link JmsListenerEndpointRegistry} instance for this
* registrar, may be {@code null}.
*/
public @Nullable JmsListenerEndpointRegistry 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.
*/
public void setMessageHandlerMethodFactory(@Nullable MessageHandlerMethodFactory messageHandlerMethodFactory) {
this.messageHandlerMethodFactory = messageHandlerMethodFactory;
}
/**
* Return the custom {@link MessageHandlerMethodFactory} to use, if any.
*/
public @Nullable MessageHandlerMethodFactory getMessageHandlerMethodFactory() {
return this.messageHandlerMethodFactory;
}
/**
* Set the {@link JmsListenerContainerFactory} to use in case a {@link JmsListenerEndpoint}
* is registered with a {@code null} container factory.
* <p>Alternatively, the bean name of the {@link JmsListenerContainerFactory} to use
* can be specified for a lazy lookup, see {@link #setContainerFactoryBeanName}.
*/
public void setContainerFactory(JmsListenerContainerFactory<?> containerFactory) {
this.containerFactory = containerFactory;
}
/**
* Set the bean name of the {@link JmsListenerContainerFactory} to use in case
* a {@link JmsListenerEndpoint} is registered with a {@code null} container factory.
* Alternatively, the container factory instance can be registered directly:
* see {@link #setContainerFactory(JmsListenerContainerFactory)}.
* @see #setBeanFactory
*/
public void setContainerFactoryBeanName(String containerFactoryBeanName) {
this.containerFactoryBeanName = containerFactoryBeanName;
}
/**
* A {@link BeanFactory} only needs to be available in conjunction with
* {@link #setContainerFactoryBeanName}.
*/
@Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public void afterPropertiesSet() {
registerAllEndpoints();
}
protected void registerAllEndpoints() {
Assert.state(this.endpointRegistry != null, "No JmsListenerEndpointRegistry set");
for (JmsListenerEndpointDescriptor descriptor : this.endpointDescriptors) {
this.endpointRegistry.registerListenerContainer(
descriptor.endpoint, resolveContainerFactory(descriptor));
}
this.startImmediately = true; // trigger immediate startup
}
private JmsListenerContainerFactory<?> resolveContainerFactory(JmsListenerEndpointDescriptor 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");
// Consider changing this if live change of the factory is required...
this.containerFactory = this.beanFactory.getBean(
this.containerFactoryBeanName, JmsListenerContainerFactory.class);
return this.containerFactory;
}
else {
throw new IllegalStateException("Could not resolve the " +
JmsListenerContainerFactory.class.getSimpleName() + " to use for [" +
descriptor.endpoint + "] no factory was given and no default is set.");
}
}
/**
* Register a new {@link JmsListenerEndpoint} alongside the
* {@link JmsListenerContainerFactory} to use to create the underlying container.
* <p>The {@code factory} may be {@code null} if the default factory should be
* used for the supplied endpoint.
*/
public void registerEndpoint(JmsListenerEndpoint endpoint, @Nullable JmsListenerContainerFactory<?> factory) {
Assert.notNull(endpoint, "Endpoint must not be null");
Assert.hasText(endpoint.getId(), "Endpoint id must be set");
// Factory may be null, we defer the resolution right before actually creating the container
JmsListenerEndpointDescriptor descriptor = new JmsListenerEndpointDescriptor(endpoint, factory);
if (this.startImmediately) { // register and start immediately
Assert.state(this.endpointRegistry != null, "No JmsListenerEndpointRegistry set");
this.endpointRegistry.registerListenerContainer(descriptor.endpoint,
resolveContainerFactory(descriptor), true);
}
else {
this.endpointDescriptors.add(descriptor);
}
}
/**
* Register a new {@link JmsListenerEndpoint} using the default
* {@link JmsListenerContainerFactory} to create the underlying container.
* @see #setContainerFactory(JmsListenerContainerFactory)
* @see #registerEndpoint(JmsListenerEndpoint, JmsListenerContainerFactory)
*/
public void registerEndpoint(JmsListenerEndpoint endpoint) {
registerEndpoint(endpoint, null);
}
private static class JmsListenerEndpointDescriptor {
public final JmsListenerEndpoint endpoint;
public final @Nullable JmsListenerContainerFactory<?> containerFactory;
public JmsListenerEndpointDescriptor(JmsListenerEndpoint endpoint,
@Nullable JmsListenerContainerFactory<?> containerFactory) {
{
int evenNumberCount = 0;
for (int candidateNumber = 0; candidateNumber < 6; candidateNumber++) {
if (candidateNumber % 2 == 0) {
evenNumberCount++;
}
}
}
this.endpoint = endpoint;
this.containerFactory = containerFactory;
}
}
}