Parallel resolution of artifacts
--------------------------------

                 Key: MNG-3379
                 URL: http://jira.codehaus.org/browse/MNG-3379
             Project: Maven 2
          Issue Type: New Feature
          Components: Artifacts and Repositories
    Affects Versions: 2.0.8
            Reporter: Don Brown
         Attachments: parallel-resolution.diff

Artifacts should be resolved in parallel, grouped by group id's to get around 
the lack of synchronization in the local repository.  The patch does the 
following:
* Use a ThreadPoolExecutor to parallelize artifact resolution, but takes care 
not to resolve multiple artifacts from the same group id simultaneously. 
(requires Java 5)
* Makes the http wagon the default instead of the poor performing http-client

Disadvantages: 
* Requires Java 5, but the backport jars could be substituted pretty easily
* Breaks some plugins due to commons-logging being in the Maven uber jar 
(required by commons-httpclient), notably the apt plugin (maybe more should use 
the isolatedRealm setting?)
* Screws up the progress monitor as multiple threads are updating it

Advantages:
* Much faster when combined with the http wagon (WAGON-98).  I was seeing 40% 
improvement on some test builds.


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