SimpleEventPublisher.java

/*
 * Copyright 2011-2014 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 pl.com.bottega.ecommerce.system.infrastructure.events;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import pl.com.bottega.ddd.support.domain.DomainEventPublisher;
import pl.com.bottega.ecommerce.system.infrastructure.events.impl.handlers.EventHandler;

@Component
public class SimpleEventPublisher implements DomainEventPublisher {

    private static final Logger LOGGER = LoggerFactory.getLogger(SimpleEventPublisher.class);

    private Set<EventHandler> eventHandlers = new HashSet<EventHandler>();

    public void registerEventHandler(EventHandler handler) {
        eventHandlers.add(handler);
        // new SpringEventHandler(eventType, beanName, method));
    }

    @Override
    public void publish(Serializable event) {
        doPublish(event);
    }

    protected void doPublish(Object event) {
        for (EventHandler handler : new ArrayList<EventHandler>(eventHandlers)) {
            if (handler.canHandle(event)) {
                try {
                    handler.handle(event);
                } catch (Exception e) {
                    LOGGER.error("event handling error", e);
                }
            }
        }
    }
}