[build] Investigate the eclipse project setup optimal for Magma project
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Key: LABS-385
URL: https://issues.apache.org/jira/browse/LABS-385
Project: Labs
Issue Type: Improvement
Components: Magma
Reporter: Simone Gianni
Fix For: Next
Currently a magma project is seen by eclipse as :
- A Maven project
- An AspectJ project
Maven builds the classpath for the project, placing all the dependency jars in
it.
AspectJ however have three distinct "classpaths". One is called "aspectpath"
and is where to find aspects to apply to the current project and to jar in the
"inpath". The "inpath" contains jar to which aspects of the current project and
the "aspectpath" apply. the other is the common classpath.
There "three way" distinction is aimed at offering better performances when
AspectJ compiles, but is somehow difficult for a user to get used to it. So, in
Magma, everything containing an aop.xml or aop-ajc.xml file is placed on the
aspectpath, and everything else on the inpath.
This happens during maven builds and magma:run LTW, but does not happen inside
eclipse. Infact there are two kind of problems :
- Eclipse see the entire "Maven dependencies" classpath entry as more or less
monolithic, at least it is not possible to configure which single jars go on
the aspectpath from the user interface, maybe it's possible to do it
programmatically.
- Placing everything on the aspectpath, partially solves the problem, because
it makes AspectJ markers appear in your project, but does not resolve ITDs
correctly (which are vital for Magma) cause does not apply them to the target
classes.
- Placing everything also on the inpath requires way too much RAM (at least
last time i tested it), eclipse starts hogging the CPU for a few minutes until
GC refuses to keep that load and the compilation fails.
We should examine a way to setup a magma project correctly, eventually
extending the eclipse:eclipse maven plugin, or writing a "magma project nature"
for eclipse, able to apply in eclipse the same situation found in the maven
build, so that eclipse AJDT plugin can offer the user proper interface while
writing Magma classes.
It would be enormously helpful if AspectJ (AJDT specifically) provided a way to
set a "check only" path, that does not actually perform complete compilation,
but is used only to check :
- If a pointcut applies
- If there is an ITD
- If that ITD applies correctly
- If there is a precedence problem
While these informations require more or less a complete build to be produced,
still not writing the entire weaved inpath to files would save quite a bit of
system resources, taking for granted that is not eclipse in charge of producing
the final build, but some external tool (LTW eventually) that will then handle
the situation correctly.
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