/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.airavata.ws.monitor.event;
import java.util.LinkedList;
import java.util.List;
import org.apache.airavata.workflow.model.exceptions.WorkflowException;
import org.apache.airavata.workflow.model.exceptions.WorkflowRuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class EventProducer {
private static final Logger logger = LoggerFactory.getLogger(EventProducer.class);
private List<EventListener> listeners = new LinkedList<EventListener>();
/**
* @param listener
*/
public void addEventListener(EventListener listener) {
this.listeners.add(listener);
}
/**
* @param listener
*/
public void removeEventListener(EventListener listener) {
this.listeners.remove(listener);
}
/**
* @param event
*/
public void sendSafeEvent(Event event) {
Throwable exception = null;
for (EventListener listener : this.listeners) {
try {
listener.eventReceived(event);
} catch (Throwable e) {
logger.error(e.getMessage(), e);
// Just remember the first one.
if (exception == null) {
exception = e;
}
}
}
if (exception != null) {
if (exception instanceof RuntimeException) {
throw (RuntimeException) exception;
} else {
throw new WorkflowRuntimeException(exception);
}
}
}
/**
* Sends an event.
*
* @param event
* @throws WorkflowException
*/
public void sendEvent(Event event) throws WorkflowException {
Throwable exception = null;
for (EventListener listener : this.listeners) {
try {
listener.eventReceived(event);
} catch (Throwable e) {
logger.error(e.getMessage(), e);
// Just remember the first one.
if (exception == null) {
exception = e;
}
}
}
if (exception != null) {
if (exception instanceof WorkflowException) {
throw (WorkflowException) exception;
} else {
throw new WorkflowException(exception);
}
}
}
}