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Reading only the last modification timestamp of an updatesite [message #769337]

Wed, 21 December 2011 15:47

Markus Oley
Messages: 227
Registered: July 2009
Location: Germany

Senior Member

Hi to all,

I want to implement a feature, which
should read the entire updatesite only, if changed until the last loading.
I've done it like this:

IMetadataRepositoryManager manager = ....
IMetadataRepository repository = manager.loadRepository(new URI(updatesiteUrl), 0, new NullProgressMonitor());
String timestamp = repository.getProperty("p2.timestamp");
    Long timestampLongSite = new Long(timestamp);

I've seen there is a property p2.timestamp, which I read. But therefore I have to read the entire site, which is often unnecessary to me. This action needs a lot of time, if I have many updatesites in scope.

Is it possible to get this property without reading the whole site and is this property always reset, if content of a site changes (even on composite-sites?) or is there another features, which can handle this?

Can you please give me a hint?

Best regards
Markus

Best regards

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Re: Reading only the last modification timestamp of an updatesite [message #769687 is a reply to message #769337]

Thu, 22 December 2011 09:36

DJ Houghton
Messages: 28
Registered: July 2009

Junior Member

The IMetadataRepositoryManager#loadRepository method is spec'd that it may use a cached copy of the repository if one is available. I believe depending on the repository type, that in the code (for an HTTP accessible repository) we do a HEAD call to get the timestamp and only reload if necessary. So what you are trying to accomplish should already be working. If it isn't working for you then please enter a bug against the Equinox/p2 component along with the version of the build you are using and steps to reproduce. Thanks.

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Re: Reading only the last modification timestamp of an updatesite [message #773932 is a reply to message #769687]

Mon, 02 January 2012 17:48

Markus Oley
Messages: 227
Registered: July 2009
Location: Germany

Senior Member

Hi again,

yes it is already working while my eclipse is running. But If I have to restart it, the site is read without using any cache the first time. So is there any mechanism to hold the cache longer than until the next restart of the workspace? Can I store and reload it?

Or can I determine the timestamp of last change to notice it myself?

Thanks for help

Best regards
Markus

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