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A set of classes and interfaces that help integrate modules
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/*
* Copyright (C) 2023 Dynamia Soluciones IT S.A.S - NIT 900302344-1
* Colombia / South America
*
* 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 tools.dynamia.integration.ms;
import tools.dynamia.integration.scheduling.SchedulerUtil;
import tools.dynamia.integration.scheduling.Task;
import java.util.List;
/**
* The Class SimpleMessageChannel.
*/
@SuppressWarnings("rawtypes")
public class SimpleMessageChannel implements MessageChannel {
private final String name;
private boolean async = false;
/**
* Instantiates a new simple message channel.
*
* @param name the uid
*/
public SimpleMessageChannel(String name) {
super();
this.name = name;
}
/*
* (non-Javadoc)
*
* @see com.dynamia.tools.integration.ms.MessageChannel#getUID()
*/
@Override
public String getName() {
return name;
}
public boolean isAsync() {
return async;
}
void setAsync(boolean async) {
this.async = async;
}
/*
* (non-Javadoc)
*
* @see
* com.dynamia.tools.integration.ms.MessageChannel#post(com.dynamia.tools
* .integration.ms.Message)
*/
@Override
public void publish(Message message) {
publish(message, "");
}
@Override
public void publish(Message message, String topic) {
publish(message, topic, "");
}
@Override
@SuppressWarnings("unchecked")
public void publish(Message message, String topic, String callback) {
MessageEvent event = new MessageEvent(message, topic, callback);
List listeners = MessageChannels.lookupListeners(getName(), topic);
message.addHeader(Message.HEADER_LISTENER_COUNT, 0);
for (MessageListener messageListener : listeners) {
if (!isAsync()) {
fireListener(event, messageListener);
} else {
SchedulerUtil.run(new Task("MessageListenerTask: " + messageListener) {
@Override
public void doWork() {
fireListener(event, messageListener);
}
});
}
}
}
private boolean fireListener(MessageEvent event, MessageListener messageListener) {
try {
//noinspection unchecked
messageListener.onMessage(event);
event.message().addHeader(Message.HEADER_LISTENER_COUNT,
(Integer) event.message().getHeader(Message.HEADER_LISTENER_COUNT) + 1);
return true;
} catch (ClassCastException e) {
// No generic type, nothing to do
} catch (Throwable e) {
var msg = "Exception firing " + event + " to listener " + messageListener + ": " + e.getMessage();
if (messageListener instanceof MessageExceptionHandler) {
//noinspection unchecked
((MessageExceptionHandler) messageListener).onMessageException(event, new MessageException(msg, e));
} else {
throw new MessageException(msg, e);
}
}
return false;
}
}
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