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From John Burwell <>
Subject Re: Merge request: Merging api_refactoring on master
Date Sat, 22 Dec 2012 18:57:45 GMT

Is the refactoring based on JAX-RS or does it still use the custom
REST mechanism?


On Dec 22, 2012, at 1:52 PM, Alex Huang <> wrote:

> Correct me if I'm wrong here, Rohit.  I believe the refactoring work consists of the
> - Moving java packages around for better grouping.  These doesn't have much impact on
the query API, except for maybe some typos in the file.
> - Splitting the commands that have optional admin commands into an admin package.  The
current should still be referencing the admin package as it is backwards
compatible with 4.0.0.
> - Additions in the processing engine to process the new annotations added.  If the annotation
is not there, the processing remains the same as the 4.0.0.
> - Work on the response side to make sure the UUIDs that were being returned are not done
through n+1 queries but from a big join.
> The work on uuid etc actually happened in 3.0.0 but it was done in rather horrific fashion,
causing problems in upgrade, performance, scalability, and security.  We're really just cleaning
up in terms of that.  If you're running 3.0-4.0, you should be seeing uuids in the responses
and using uuids in the incoming query parameters already.  If you see specific examples where
it is not, it's a bug in the api.
> I don't think it will break the end user api other than bugs introduced during coding.
 In fact, we took great effort to keep the api the same.  If we didn't have that constraint,
I would  have designed a completely new REST style api instead of keeping the semi-awkward
query language the current api is on.  This refactoring is all about keeping the over-the-wire
api the same while moving a lot of the hard-coded parameter checking, security checking, etc
into adapters to decouple the different aspects of checking to see if an api should be executed.
> --Alex
>> -----Original Message-----
>> From: Chip Childers []
>> Sent: Saturday, December 22, 2012 6:26 AM
>> To: <>
>> Subject: Re: Merge request: Merging api_refactoring on master
>> So it sounds like a ton of good work.
>> However, the proposed merge also sounds like it breaks public API
>> compatibility with 4.0.0 in both the uuid / id changes and in the list
>> result changes.
>> So I guess this is my first question: does the community agree that
>> the benefits of these changes outweigh the concerns about moving
>> straight from 4.0.0 to 5.0.0?
>> Rohit, I think we HAVE to have concerns us on that question before
>> this merge happens.
>> - chip
>> Sent from my iPhone.
>> On Dec 22, 2012, at 4:38 AM, Rohit Yadav <> wrote:
>>> Hi everyone,
>>> I'm planning to merge api_refactoring branch on to master after 72 hour
>> period which would be Monday EOD. Pl. go through the email, and previous
>> threads on api refactoring rework and feel free to share your ideas,
>> comments and vote to agree, disagree. If no one objects I would like to ask
>> the git Santa to merge it on Christmas 25 Dec :D (after 72 hour window)
>>> The reason why I want to merge around the next week is because I think
>> we would have lower frequencies of emails, review requests and people
>> contributing, hence I can move around a lot of code (mostly package
>> renames to org.apache.cloudstack in cloud-api) and right now the merge
>> conflicts are really minimum, about 100-200 lines. (A top level issues to track
>> sub-issues:
>>> What will be affected:
>>> 0. Any class in cloud-api and on api-layer only
>>> 1. Any class that imports from/to cloud-api's response and cmd classes
>>> Some of the major changes that will be merged on master;
>>> 0. Over the wire (OTW) HTTP request to API server would send only UUID
>> strings. All requests done via UUIDs (and not CloudStack's internal db's IDs).
>>> 1. Fix
>> @Parameter annotation to have annotation field to a Response class which
>> would give us entities (interface to VO objects). This would get rid of all
>> IdentityMapper using which was used earlier to get VO entities from an
>> annotated table name. This helps us to translate OTW UUIDs to CloudStack's
>> DB's internal IDs.
>>> 2. Separation of ACL Role access checker as an adapter, so organizations can
>> implement their own role based access checking. The mechanism would exist
>> in CloudStack's API server but policy checking is moved out of CloudStack.
>> ( This works, but
>> was tough to get it right the first time, there is better way which I'll share
>> before the merge.
>>> 3. Group APIs to
>> org.apache.cloudstack.api.{command,response}.{entity1,entity2 etc.}
>> packages. This is mainly done for developers, so when they work on API layer
>> they would know which api has what level of security and as they are
>> grouped based on entity type, it will be easier to search. This was mostly file
>> movement to org.apache.cloudstack.api package and helped us track couple
>> of classes which are no longer needed. Another aim was to move from
>> to org.apache.cloudstack (only cloud-api for now).
>>> 4. Annotation work as described in 1., also for @ACL etc.
>>> 5. DB, ACL validation wip code
>>> 6. A lot of list api optimizations and response view work from our newest
>> commiter, Min Chen. The aim is to simply response, right now for. example
>> when we listVMs we don't want unnecessary (serialized) response objects
>> which could be queried using uuids separately.
>>> Pl. ask away any doubts, questions and concerns you may have. It was
>> challenging for me as well to understand the functional spec, to know the
>> why/what/how, and if you read the old threads you can tell I did not get it
>> the first time.
>>> A lot of annotation work is aimed to be completed over this weekend, so
>> when the branch is finally merged it won't break any functionality. At present
>> the branch is quite stable
>>> Testing and how or why do it?
>>> 0. Prasanna, Meghna? can help us write few basic sets of unit tests and
>> marvin integration tests for OTW requests. We already have few of their
>> patches on rb.
>>> 1. We can also have drivers to automate tests (Prasanna can talk more on
>> this and on his devcloud based continuous intergration server)
>>> 2. If I do it now, there would be a lot more eyes to point out bugs and I
>> want more people to participate in the refactoring work.
>>> 3. Right now, it builds and runs fine with minimal breaks and no
>> functionality breakage as most of the changes are only restricted to api-
>> server (:cloud-api artifact). I'm able to deploy a zone etc. To make the UUID
>> thing work, I've put in hardcoded (for. ex. projectId=-1 which should be a
>> string uuid not a long int value -1) stuff that saves the UI from being broken
>> which I'll remove after merging on master so UI engineers can help fix UI
>> issues.
>>> Lastly, I would like to thank Min for her amazing patches and optimization
>> work, Prachi for her work on ACL, Fang, Prasanna, Likitha for their help with
>> the refactoring work and for their contributions. Community for asking
>> questions, raising issues and thanks to Alex for his guidance, reviews and
>> kickass OOP concepts.
>>> Ref;
>> conference-12-refactoring-cloud-stack
>> cloudstack.git;a=shortlog;h=refs/heads/api_refactoring
>> refactoring
>>> Regards.
>>> PS. will write a blog on it this weekend so folks can follow what's going on
>>> PPS. maybe explain in a video

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