cf.spring.NatsVcapFactoryBean.java Source code

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Here is the source code for cf.spring.NatsVcapFactoryBean.java

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/*
 *   Copyright (c) 2012 Mike Heath.  All rights reserved.
 *
 *   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 cf.spring;

import cf.nats.CfNats;
import cf.nats.DefaultCfNats;
import cf.nats.Publication;
import nats.NatsException;
import nats.client.Nats;
import cf.nats.MessageBody;
import cf.nats.PublicationHandler;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.util.Collection;

/**
 * @author Mike Heath <elcapo@gmail.com>
 */
public class NatsVcapFactoryBean implements FactoryBean<CfNats>, InitializingBean {

    private final CfNats cfNats;

    private final Collection<VcapSubscriptionConfig> subscriptions;

    public NatsVcapFactoryBean(Nats nats, Collection<VcapSubscriptionConfig> subscriptions) {
        cfNats = new DefaultCfNats(nats);
        this.subscriptions = subscriptions;
    }

    @Override
    public CfNats getObject() {
        return cfNats;
    }

    @Override
    public Class<?> getObjectType() {
        return cfNats.getClass();
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

    @SuppressWarnings("unchecked")
    @Override
    public void afterPropertiesSet() throws Exception {
        for (VcapSubscriptionConfig subscription : subscriptions) {
            final Object bean = subscription.getBean();
            final String methodName = subscription.getMethodName();
            final Method method = bean.getClass().getMethod(methodName, Publication.class);
            final ParameterizedType parameterTypes = (ParameterizedType) method.getGenericParameterTypes()[0];
            Class<MessageBody<Object>> parameterType = (Class<MessageBody<Object>>) parameterTypes
                    .getActualTypeArguments()[0];
            final String queueGroup = subscription.getQueueGroup();
            cfNats.subscribe(parameterType, queueGroup, new PublicationHandler<MessageBody<Object>, Object>() {
                @Override
                public void onMessage(Publication publication) {
                    try {
                        method.invoke(bean, publication);
                    } catch (IllegalAccessException e) {
                        throw new Error(e);
                    } catch (InvocationTargetException e) {
                        throw new NatsException(e.getTargetException());
                    }
                }
            });
        }
    }
}