AspectJ
AspectJ is an actively used programming language created in 2001. AspectJ is an aspect-oriented programming (AOP) extension created at PARC for the Java programming language. It is available in Eclipse Foundation open-source projects, both stand-alone and integrated into Eclipse. AspectJ has become a widely used de facto standard for AOP by emphasizing simplicity and usability for end users. Read more on Wikipedia...
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- AspectJ ranks in the top 5% of languages
- the AspectJ website
- the AspectJ wikipedia page
- AspectJ first appeared in 2001
- file extensions for AspectJ include aj
- See also: java, eclipse-editor, emacs-editor, isbn
- Have a question about AspectJ not answered here? Email me and let me know how I can help.
Example code from Linguist:
package com.blogspot.miguelinlas3.aspectj.cache;
import java.util.Map;
import java.util.WeakHashMap;
import org.aspectj.lang.JoinPoint;
import com.blogspot.miguelinlas3.aspectj.cache.marker.Cachable;
/**
* This simple aspect simulates the behaviour of a very simple cache
*
* @author migue
*
*/
public aspect CacheAspect {
public pointcut cache(Cachable cachable): execution(@Cachable * * (..)) && @annotation(cachable);
Object around(Cachable cachable): cache(cachable){
String evaluatedKey = this.evaluateKey(cachable.scriptKey(), thisJoinPoint);
if(cache.containsKey(evaluatedKey)){
System.out.println("Cache hit for key " + evaluatedKey);
return this.cache.get(evaluatedKey);
}
System.out.println("Cache miss for key " + evaluatedKey);
Object value = proceed(cachable);
cache.put(evaluatedKey, value);
return value;
}
protected String evaluateKey(String key, JoinPoint joinPoint) {
// TODO add some smart staff to allow simple scripting in @Cachable annotation
return key;
}
protected Map<String, Object> cache = new WeakHashMap<String, Object>();
}
Example code from Wikipedia:
pointcut set() : execution(* set*(..) ) && this(Point);
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Last updated August 9th, 2020