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package org.apache.camel.spring; |
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import org.aopalliance.intercept.MethodInvocation; |
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import org.apache.camel.CamelContext; |
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import org.apache.camel.Consumer; |
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import org.apache.camel.Endpoint; |
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import org.apache.camel.EndpointInject; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.MessageDriven; |
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import org.apache.camel.Processor; |
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import org.apache.camel.Producer; |
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import org.apache.camel.RuntimeCamelException; |
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import org.apache.camel.CamelTemplate; |
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import org.apache.camel.spring.util.BeanInfo; |
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import org.apache.camel.spring.util.DefaultMethodInvocationStrategy; |
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import org.apache.camel.spring.util.MethodInvocationStrategy; |
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import org.apache.camel.spring.util.ReflectionUtils; |
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import org.apache.camel.util.ObjectHelper; |
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import static org.apache.camel.util.ObjectHelper.isNotNullOrBlank; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import org.springframework.beans.BeansException; |
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import org.springframework.beans.factory.NoSuchBeanDefinitionException; |
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import org.springframework.beans.factory.config.BeanPostProcessor; |
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import org.springframework.context.ApplicationContext; |
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import org.springframework.context.ApplicationContextAware; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.Method; |
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import java.util.ArrayList; |
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import java.util.List; |
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public class CamelBeanPostProcessor implements BeanPostProcessor, ApplicationContextAware { |
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private static final transient Log log = LogFactory.getLog(CamelBeanPostProcessor.class); |
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private CamelContext camelContext; |
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private ApplicationContext applicationContext; |
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private MethodInvocationStrategy invocationStrategy = new DefaultMethodInvocationStrategy(); |
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public CamelBeanPostProcessor() { |
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} |
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public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { |
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injectFields(bean); |
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injectMethods(bean); |
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return bean; |
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} |
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public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { |
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return bean; |
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} |
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public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { |
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this.applicationContext = applicationContext; |
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} |
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public MethodInvocationStrategy getInvocationStrategy() { |
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return invocationStrategy; |
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} |
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public void setInvocationStrategy(MethodInvocationStrategy invocationStrategy) { |
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this.invocationStrategy = invocationStrategy; |
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} |
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public CamelContext getCamelContext() { |
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return camelContext; |
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} |
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public void setCamelContext(CamelContext camelContext) { |
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this.camelContext = camelContext; |
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} |
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protected void injectFields(final Object bean) { |
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ReflectionUtils.doWithFields(bean.getClass(), new ReflectionUtils.FieldCallback() { |
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public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException { |
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EndpointInject annotation = field.getAnnotation(EndpointInject.class); |
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if (annotation != null) { |
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ReflectionUtils.setField(field, bean, getEndpointInjectionValue(annotation, field.getType())); |
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} |
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} |
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}); |
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} |
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protected void injectMethods(final Object bean) { |
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ReflectionUtils.doWithMethods(bean.getClass(), new ReflectionUtils.MethodCallback() { |
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@SuppressWarnings("unchecked") |
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public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException { |
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setterInjection(method, bean); |
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consumerInjection(method, bean); |
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} |
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}); |
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} |
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protected void setterInjection(Method method, Object bean) { |
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EndpointInject annoation = method.getAnnotation(EndpointInject.class); |
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if (annoation != null) { |
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Class<?>[] parameterTypes = method.getParameterTypes(); |
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if (parameterTypes != null) { |
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if (parameterTypes.length != 1) { |
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log.warn("Ignoring badly annotated method for injection due to incorrect number of parameters: " + method); |
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} |
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else { |
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Object value = getEndpointInjectionValue(annoation, parameterTypes[0]); |
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ObjectHelper.invokeMethod(method, bean, value); |
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} |
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} |
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} |
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} |
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protected void consumerInjection(final Object bean) { |
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ReflectionUtils.doWithMethods(bean.getClass(), new ReflectionUtils.MethodCallback() { |
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@SuppressWarnings("unchecked") |
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public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException { |
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} |
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}); |
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} |
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protected void consumerInjection(Method method, Object bean) { |
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MessageDriven annotation = method.getAnnotation(MessageDriven.class); |
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if (annotation != null) { |
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log.info("Creating a consumer for: " + annotation); |
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Endpoint endpoint = getEndpointInjection(annotation.uri(), annotation.name()); |
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if (endpoint != null) { |
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try { |
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Processor processor = createConsumerProcessor(bean, method, endpoint); |
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log.info("Created processor: " + processor); |
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Consumer consumer = endpoint.createConsumer(processor); |
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consumer.start(); |
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addConsumer(consumer); |
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} |
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catch (Exception e) { |
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log.warn(e); |
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throw new RuntimeCamelException(e); |
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} |
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} |
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} |
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} |
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protected Processor createConsumerProcessor(final Object pojo, final Method method, final Endpoint endpoint) { |
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final BeanInfo beanInfo = new BeanInfo(pojo.getClass(), invocationStrategy); |
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return new Processor() { |
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@Override |
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public String toString() { |
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return "Processor on " + endpoint; |
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} |
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public void process(Exchange exchange) throws Exception { |
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if (log.isDebugEnabled()) { |
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log.debug(">>>> invoking method for: " + exchange); |
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} |
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MethodInvocation invocation = beanInfo.createInvocation(method, pojo, exchange); |
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if (invocation == null) { |
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throw new IllegalStateException("No method invocation could be created"); |
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} |
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try { |
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invocation.proceed(); |
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} |
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catch (Exception e) { |
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throw e; |
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} |
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catch (Throwable throwable) { |
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throw new Exception(throwable); |
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} |
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} |
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}; |
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} |
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protected void addConsumer(Consumer consumer) { |
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log.debug("Adding consumer: " + consumer); |
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} |
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protected Object getEndpointInjectionValue(EndpointInject annotation, Class<?> type) { |
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Endpoint endpoint = getEndpointInjection(annotation.uri(), annotation.name()); |
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if (endpoint != null) { |
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if (type.isInstance(endpoint)) { |
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return endpoint; |
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} |
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else if (type.isAssignableFrom(Producer.class)) { |
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try { |
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return endpoint.createProducer(); |
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} |
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catch (Exception e) { |
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throw new RuntimeCamelException(e); |
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} |
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} |
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else if (type.isAssignableFrom(CamelTemplate.class)) { |
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return new CamelTemplate(getCamelContext(), endpoint); |
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} |
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} |
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return null; |
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} |
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protected Endpoint getEndpointInjection(String uri, String name) { |
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Endpoint endpoint = null; |
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if (isNotNullOrBlank(uri)) { |
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endpoint = camelContext.getEndpoint(uri); |
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} |
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else { |
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if (isNotNullOrBlank(name)) { |
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endpoint = (Endpoint) applicationContext.getBean(name); |
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if (endpoint == null) { |
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throw new NoSuchBeanDefinitionException(name); |
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} |
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} |
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else { |
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log.warn("No uri or name specified on @EndpointInject annotation!"); |
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} |
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} |
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return endpoint; |
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} |
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} |