
org.tickcode.broadcast.BroadcastImpl.aj Maven / Gradle / Ivy
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package org.tickcode.broadcast;
import org.apache.log4j.Logger;
/**
* This aspect will provide behavior to any class implementing interfaces that
* extend {@link Broadcast}. Any interface that extends {@link Broadcast} must
* have methods that are unique across all the subclass interfaces.
*
* @author Eyon Land
*/
public aspect BroadcastImpl {
private static Logger log;
public static boolean loggingOn;
public static boolean isUsingAspectJ;
static {
log = Logger.getLogger(org.tickcode.broadcast.Broadcast.class);
loggingOn = (log.getEffectiveLevel() != org.apache.log4j.Level.OFF);
AbstractMessageBroker.setUsingAspectJ(true);
}
pointcut shouldLog() : !within(Logging) && if(loggingOn);
pointcut broadcastPointcutWithArguments(Broadcast _this):
execution(@BroadcastProducer public * org.tickcode.broadcast.Broadcast+.*(..))
&& this(_this) && if(AbstractMessageBroker.isUsingAspectJ());
/**
* Use this advice for methods with @BroadcastProducer annotations
*/
after(Broadcast _this) returning: broadcastPointcutWithArguments(_this){
MessageBroker broker = _this.messageBroker;
if(broker == null)
throw new NoMessageBrokerException("Did you forget to add " + _this.getClass().getName() + " to a message broker?");
String methodName = thisJoinPointStaticPart.getSignature().getName();
Object[] params = thisJoinPoint.getArgs();
broker.broadcast(_this, methodName, params);
}
pointcut messageBrokerAddPointcut(MessageBroker _this, Broadcast consumer):
execution(public void org.tickcode.broadcast.MessageBroker+.add(Broadcast))
&& this(_this) && args(consumer) && if(AbstractMessageBroker.isUsingAspectJ());
/**
* This advice will be ensure that the field messageBroker this aspect provides get's set
* when the implementation is added to a {@link MessageBroker} implementation.
* @param _this
* @param consumer
*/
before(MessageBroker _this, Broadcast consumer) : messageBrokerAddPointcut(_this, consumer){
if(consumer.messageBroker != null && consumer.messageBroker != _this)
throw new OnlyOneMessageBrokerSupportedException("You can only have one MessageBroker for each implementation.");
consumer.messageBroker = _this;
}
pointcut messageBrokerRemovePointcut(MessageBroker _this, Broadcast consumer):
execution(public void org.tickcode.broadcast.MessageBroker+.remove(Broadcast))
&& this(_this) && args(consumer) && if(AbstractMessageBroker.isUsingAspectJ());
/**
* When the {@link MessageBroker} removes this implementation of Broadcast, we make sure
* our internal messageBroker field gets set to null.
* @param _this
* @param consumer
*/
after(MessageBroker _this, Broadcast consumer) returning : messageBrokerRemovePointcut(_this, consumer){
consumer.messageBroker = null;
}
/**
* An internal field to hold the {@link MessageBroker}. This field is used only by this aspect.
* @return
*/
private MessageBroker Broadcast.messageBroker;
}
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