com.digitalgeneralists.assurance.notification.NotificationProvider.java Source code

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Here is the source code for com.digitalgeneralists.assurance.notification.NotificationProvider.java

Source

/*
 * Assurance
 * 
 * Created by Mark Johnson
 * 
 * Copyright (c) 2015 Digital Generalists, LLC.
 * 
 */
/*
 * Copyright 2015 Digital Generalists, LLC.
 *
 * 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 com.digitalgeneralists.assurance.notification;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

import com.digitalgeneralists.assurance.notification.events.IAssuranceEvent;

@Component("NotificationProvider")
public class NotificationProvider implements INotificationProvider {
    private Logger logger = Logger.getLogger(NotificationProvider.class);

    protected Map<Class<? extends IAssuranceEvent>, Collection<IEventObserver>> eventObserverList = new HashMap<Class<? extends IAssuranceEvent>, Collection<IEventObserver>>();

    public void addEventObserver(Class<? extends IAssuranceEvent> eventClass, IEventObserver observer) {
        Collection<IEventObserver> eventObservers = eventObserverList.get(eventClass);
        if (eventObservers == null) {
            eventObservers = new ArrayList<IEventObserver>();
        }
        eventObservers.add(observer);
        eventObserverList.put(eventClass, eventObservers);

        eventObservers = null;
    }

    public void removeEventObserver(Class<? extends IAssuranceEvent> eventClass, IEventObserver observer) {
        Collection<IEventObserver> eventObservers = eventObserverList.get(eventClass);
        if (eventObservers != null) {
            eventObservers.remove(observer);
            if (eventObservers.size() == 0) {
                eventObserverList.remove(eventObservers);
            }
        }

        eventObservers = null;
    }

    public void fireEvent(IAssuranceEvent event) {
        StringBuffer message = new StringBuffer(128);
        logger.info(message.append("Firing event: ").append(event));
        message.setLength(0);
        message = null;
        Collection<IEventObserver> eventObservers = eventObserverList.get(event.getClass());
        if (eventObservers != null) {
            for (IEventObserver observer : eventObservers) {
                observer.notify(event);
            }
        }

        eventObservers = null;
    }
}