Christoph Läubrich created MNG-7538:
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Summary: Delay the download of a file until it is first accesed
Key: MNG-7538
URL: https://issues.apache.org/jira/browse/MNG-7538
Project: Maven
Issue Type: Improvement
Reporter: Christoph Läubrich
Currently there is
{code:java}org.apache.maven.artifact.Artifact.setFile(File){code} that is used
while resolving an Artifact against a remote repository and that points to an
exiting file in the local repository.
This approach has the drawback, that during resolving an Artifact it needs to
be fully downloaded, even though it might not be used (yet) if one likes to
find out if it is resolvable and the meta-data would be enough to e.g. resolve
it and its dependencies.
I therefore like to suggest supporting a way of a lazy-download in the
following way:
1. There is a new method
{code:java}org.apache.maven.artifact.Artifact.setFileSupplier(Supplier<File>
supplier){code}
2. {code:java}org.apache.maven.artifact.Artifact.getFile(){code} first checks
if there is a file already set, or otherwise init it by calling the supplier if
given
3.There is a new method
{code:java}org.apache.maven.artifact.Artifact.hasFile(){code} that returns true
if there is either a file set or a file supplier
As there is a close relation with org.eclipse.aether.artifact.Artifact a
similar change might be required there as well...
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