[infinispan-dev] REST server paths and tree adapter

[Manik Surtani]

On 22 Dec 2009, at 01:03, Michael Neale wrote:

> yes, for REST api - which (by convention mostly) uses paths as keys.
> 
> so say:
> 
> server/a/b/c
> a is cache name, "b/c" is the key string.
> 
> server/a/b/c/d
> a is cache name, "b/c/d" is the key string.
> 
> So with a tree cache, b/c/d would be the hierarchy, and that means we
> could (if we wanted) do a GET on a/b (a partial path) - and it would
> return a list of items below in the hierarcy... (which may be
> folders/elements, not sure how it works exactly in tree cache)

There are explicit APIs to get content and child nodes (getData() and getChildren() respectively, on the Node interface below)

	http://docs.jboss.org/infinispan/4.0/apidocs/org/infinispan/tree/Node.html

So not sure if this helps you.  This adapter just mimics the way JBoss Cache worked as a compat layer.

> - think
> like how JCR maps to URLs, very similar to that. That could be useful
> for managing content... without tree cache, we can still do it, by
> indexing the key values (knowing they are paths) and then returning
> the items without bothering infinispan etc..

Could work, have a look at the TreeCache impl for ideas or chunks you may want to reuse.

> but if its not really something that is needed (ie no need to think of
> it as a hierarchy other then cachename/key) then it is overkill (and a
> performance issue, like you say).

Personally I don't see the value.  The fact that HTTP URLs have path-like structures is irrelevant to data storage. :)

> 
> Hope that makes sense.
> 
> 
> 
> On Mon, Dec 21, 2009 at 9:57 PM, Manik Surtani <manik at jboss.org> wrote:
>> 
>> On 21 Dec 2009, at 09:22, Michael Neale wrote:
>> 
>>> Quick Q: should I be using the tree cache "adapter" for the web/REST
>>> cache - given that keys often take the form of a /foo/bar style of
>>> path?
>> 
>> Is this for the REST API into Infinispan?  If so, the path structure passed in is purely conceptual to the user.  E.g.,
>> 
>>        http://server/infinispan/cacheName/mykey --> Key "mykey" in cache "cacheName".
>>        http://server/infinispan/cacheName/my/key --> Key "my/key" in cache "cacheName".
>> 
>> Is there any need for relationships in paths, e.g., to be able to determine that http://server/infinispan/cacheName/my/key is a child of http://server/infinispan/cacheName/my etc?
>> 
>>> What are pros/cons of using the tree cache adapter? (can you get
>>> listings of entries based on partial paths etc?)
>> 
>> The tree adapter will always be slower than the map API.  And, when writing, would be O(n) based on how deep the target node is (since parents need to be locked).  What do you mean by partial paths?
>> 
>> Cheers
>> --
>> Manik Surtani
>> manik at jboss.org
>> Lead, Infinispan
>> Lead, JBoss Cache
>> http://www.infinispan.org
>> http://www.jbosscache.org
>> 
>> 
>> 
>> 
>> 
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>> 
> 
> 
> 
> -- 
> Michael D Neale
> home: www.michaelneale.net
> blog: michaelneale.blogspot.com
> 
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--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org