Re: [appengine-java] Re: appengine unaware code!

[Muhammad Ijaz Khan]

Thanks all. This was quick :)

On Sat, May 22, 2010 at 8:46 AM, Vaclav Bartacek <
vaclav.barta...@spolecne.cz> wrote:

> As for the datastore - you can create abstract DAO layer which hides
> the actual implementation. Try AuDAO tool (http://audao.spoledge.com)
> to generate an abstract DAO layer + implementation for GAE, MySQL or
> Oracle DBs.
> However, if you want to optimize the code and also due to several
> restrictions on GAE's datastore (queries, transactions and keys), even
> the abstract DAO layer will differ for GAE and e.g. MySQL
> implementations (e.g. in GAE it can be more efficient to use multi-
> value fields = Lists than to decompose the entity (table) into more
> entities (tables)).
>
> Vaclav
>
>
> On May 22, 12:35 am, aijazzz  wrote:
> > Hi,
> > I was looking to some examples to start my work on google appengine
> > application and found out that I have to use appengine related code in
> > source. For example, in a database example I found this,
> > import com.google.appengine.api.datastore.Key;
> >
> > I am wondering if there is a way I can keep my code clean so that I
> > can use same code in another environment?
> > Please suggest. Thanks.
> >
> > regards,
> > Ijaz
> >
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Re: [appengine-java] AppEngine session advice

[Muhammad Ijaz Khan]

Any comment on this by anyone? I am waiting too :)
thanks.

On Tue, May 25, 2010 at 1:18 PM, Ice13ill  wrote:

> I'm building an app that uses Google account auth.
> The application also uses a custom persistent entity (UserProfile) for
> users that are registered (so basically there are functionalities that
> can be used for free and others by registering).
> At the beginning, the app was simple, so at every request the user was
> checked by calling .getUserService().getCurrentUser() (including at
> first login obviously). But it seams that a call to that method can
> sometimes take about 3-5 seconds and also, clearly it is not he best
> way.
> So I need some advice implementing the session part, using what is
> described in the appengine documentation (session-enable + memcache +
> etc) . It does'n seem hard, but I know that some hints&tips could help
> me at the beginning.
> Thanks.
>
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[appengine-java] application search!

[Muhammad Ijaz Khan]

Hi,
Is the applications during development is searchable by other users?
like, can someone come game1.appspot.com although it isnt advertised yet?
Please elighten.
regards,
Ijaz

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[appengine-java] GAE commercial use!

[Muhammad Ijaz Khan]

Hi,

Is there a commercial big sized service running on appengine platform? It
will be highly appreciable if someone can link to a book for google
appengine for java too. Thanks.

regards,
Ijaz

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Re: [appengine-java] Re: GAE commercial use!

[Muhammad Ijaz Khan]

Yes, I have started reading it now, it looks good :) thanks.

Any comment on commercial grade system deployment using appengine for java?

On Wed, Jun 16, 2010 at 6:33 AM, Didier Durand wrote:

> Hi,
>
> Go for this book
>
> http://www.amazon.com/Programming-Google-App-Engine-Infrastructure/dp/059652272X/ref=sr_1_1?ie=UTF8&s=books&qid=1276659135&sr=1-1
>
> Great (written by a googler) especially on datastore
> didier
>
> On Jun 15, 10:42 am, Muhammad Ijaz Khan  wrote:
> > Hi,
> >
> > Is there a commercial big sized service running on appengine platform? It
> > will be highly appreciable if someone can link to a book for google
> > appengine for java too. Thanks.
> >
> > regards,
> > Ijaz
>
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Re: [appengine-java] Re: GAE commercial use!

[Muhammad Ijaz Khan]

Yeah, it seems that google is offering it for the end users systems also but
I am interested to know if there are any successful services running on GAE.
Still wondering.

On Wed, Jun 16, 2010 at 9:29 PM, Houston startup coder <
stephenh...@gmail.com> wrote:

> Check this out:
>
> http://code.google.com/appengine/business
>
>
> Stephen
>
>
>
> On Jun 16, 3:07 am, Muhammad Ijaz Khan  wrote:
> > Yes, I have started reading it now, it looks good :) thanks.
> >
> > Any comment on commercial grade system deployment using appengine for
> java?
> >
> > On Wed, Jun 16, 2010 at 6:33 AM, Didier Durand  >wrote:
> >
> >
> >
> > > Hi,
> >
> > > Go for this book
> >
> > >http://www.amazon.com/Programming-Google-App-Engine-Infrastructure/dp.
> ..
> >
> > > Great (written by a googler) especially on datastore
> > > didier
> >
> > > On Jun 15, 10:42 am, Muhammad Ijaz Khan  wrote:
> > > > Hi,
> >
> > > > Is there a commercial big sized service running on appengine
> platform? It
> > > > will be highly appreciable if someone can link to a book for google
> > > > appengine for java too. Thanks.
> >
> > > > regards,
> > > > Ijaz
> >
> > > --
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> > > .
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Re: [appengine-java] Re: GAE commercial use!

[Muhammad Ijaz Khan]

hmm, thanks a lot guys. This clarifies at least something :)

On Thu, Jun 17, 2010 at 7:47 PM, Wilson MacGyver wrote:

> Neptune's Pride a online game is done using GAE
>
>
> http://googleappengine.blogspot.com/2010/04/games-on-app-engine-interview-with-jay.html
>
> On Thu, Jun 17, 2010 at 3:07 AM, Muhammad Ijaz Khan 
> wrote:
> > Yeah, it seems that google is offering it for the end users systems also
> but
> > I am interested to know if there are any successful services running on
> GAE.
> > Still wondering.
> >
> > On Wed, Jun 16, 2010 at 9:29 PM, Houston startup coder
> >  wrote:
> >>
> >> Check this out:
> >>
> >> http://code.google.com/appengine/business
> >>
> >>
> >> Stephen
> >>
> >>
> >>
> >> On Jun 16, 3:07 am, Muhammad Ijaz Khan  wrote:
> >> > Yes, I have started reading it now, it looks good :) thanks.
> >> >
> >> > Any comment on commercial grade system deployment using appengine for
> >> > java?
> >> >
> >> > On Wed, Jun 16, 2010 at 6:33 AM, Didier Durand
> >> > wrote:
> >> >
> >> >
> >> >
> >> > > Hi,
> >> >
> >> > > Go for this book
> >> >
> >> >
> >> > > >
> http://www.amazon.com/Programming-Google-App-Engine-Infrastructure/dp...
> >> >
> >> > > Great (written by a googler) especially on datastore
> >> > > didier
> >> >
> >> > > On Jun 15, 10:42 am, Muhammad Ijaz Khan  wrote:
> >> > > > Hi,
> >> >
> >> > > > Is there a commercial big sized service running on appengine
> >> > > > platform? It
> >> > > > will be highly appreciable if someone can link to a book for
> google
> >> > > > appengine for java too. Thanks.
> >> >
> >> > > > regards,
> >> > > > Ijaz
> >> >
> >> > > --
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> >> > > Groups
> >> > > "Google App Engine for Java" group.
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> >> > > To unsubscribe from this group, send email to
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>  >> > > unsubscr...@googlegroups.com>
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> >>
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Re: [appengine-java] Re: GAE or EC2

[Muhammad Ijaz Khan]

Hi,
Anyone having any other reference to GAE/EC2 comparison or other literature
please share as I am working on a comparison assignment for these two for my
course project. Thanks.
regards,
Ijaz

On Tue, Nov 9, 2010 at 7:09 AM, Vikas Hazrati  wrote:

> You might also want to check out a detailed comparison on technical
> aspects here
>
>
> http://thoughts.inphina.com/2010/11/01/comparing-google-app-engine-and-amazon-ec2-on-technology/
>
> Regards | Vikas
>
> On Nov 9, 9:32 am, Didier Durand  wrote:
> > Hi JY,
> >
> > I have used both: for a small company aiming at big applications, I
> > would definitely go GAE because it's PaaS: you don't have to deal with
> > the infrastructure which can become quite time consuming when your
> > application gets big if on EC2 (you have to update/patch your images,
> > take care of your scaling, etc.). It's probably not what you want to
> > spend time on at start with limited resource.
> >
> > On the other side, GAE has of course limitations / restrictions: Java-
> > only, datastore specific architecture, etc.
> >
> > To reassure you, (a) the code of GAE is open source (did not check if
> > 100%) and (b) some people are trying to replicate the system in an
> > independent fashion to provide alternatives: check out the AppScale
> > project athttp://
> googleappengine.blogspot.com/2010/10/research-project-appscale...
> >
> > regards
> > didier
> >
> > On Nov 9, 2:59 am, JY  wrote:
> >
> > > I want to ask fellow GAE users whether you think GAE is good choice to
> > > build real business on?
> > > I have used GAE for some personal projects, and right now help a
> > > friend on a tiny start up (but with big dream). The project is related
> > > to social network - I am thinking of two options:
> > > 1, GAE
> > > The benefits are obvious. However, it is also locking you inyou
> > > don't have much control over it. If you are unhappy later, you will
> > > have to redo the persistence layer and migrate data etc.
> > > 2, EC2
> > > You have much more control, and if the start-up gets funding, it is
> > > easy to migrate to dedicated hosting or even its own data center. The
> > > down side is developer (me, and only me) will have to spend quite some
> > > time to take care of the infrastructure (although I like this kind of
> > > work...)
> >
> > > I think my biggest concern of GAE is over the quality of service, and
> > > the data-store - if I go EC2, I probably will use a NoSQL solution
> > > like MogoDb, or Cassandra. The development efforts might be similar -
> > > all products are sort of young, hot, and limited.
> >
> > > Thanks.
> >
> > > JY
>
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Re: [appengine-java] Re: GAE or EC2

[Muhammad Ijaz Khan]

do you have specific point to be careful in schema design? or pointers to
any read?
thanks.

On Sun, Nov 14, 2010 at 11:56 AM, andrew  wrote:

> Just to reply to the point about persistence:
>
> > 1, GAE
> > The benefits are obvious. However, it is also locking you inyou
> > don't have much control over it. If you are unhappy later, you will
> > have to redo the persistence layer and migrate data etc.
>
> If you are careful, and set it as a design objective from the start
> then you can create a portable persistence layer.
>
> We do this using JDO and develope and test on GAE and Tomcat/MySql,
> which I think will also allow us to cover EC2/S3 when we can get
> around to it.
>
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[appengine-java] Two fields of sister classes in an entity!

[Muhammad Ijaz Khan]

Hi,
App engine doesnt allow yet, two fields of same class type as it says
"Class Card has multiple relationship fields of type Red: border1 and
border2.  This is not yet supported."
But can we use fields of different inherited classes from one parent? eg.
Card may have Red and Blue field types but both Red and Blue derived from
class Color.
Please update.
regards
Ijaz

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Re: [appengine-java] Re: Two fields of sister classes in an entity!

[Muhammad Ijaz Khan]

aah, I thought the same and tried with my jdo app but getting other errors
so thought to ask while i solve that issue :s

On Wed, Apr 20, 2011 at 5:08 PM, Simon Knott  wrote:

> What storage mechanism are you using JPA or JDO?  I'm assuming that if
> you've got the error message for your Card object, that it would be a
> two-minute job to test the scenario you're querying about.
>
> Cheers,
> Simon
>
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[appengine-java] A couple of datastore questions!

[Muhammad Ijaz Khan]

Hi,
I am building an application and have used JDO for datastore for
implementing use cases. Now when I am implementing the backend machine which
is a bit complex in relationships among objects then I am facing hard times
with JDO (May be due to lack of my knowledge). I have following questions to
ask,

1. Can I use reference of objects in more than one classes? For example,
Class A is persistent and being used as foreign key in Class B and Class C.
Do I need to create unowned relationships through Key or can I use some
annotation (or something) to mark a field of type A as foreign key? When I
make a field of type A in class B, and assign an object of class A to it, it
is stored as new object as child of B :s

2. Can I use objectify for this use case only (mixing with jdo) and will it
simplify stuff or not, any experience comment?

Thanks in advance.

regards
Ijaz

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Re: [appengine-java] A couple of datastore questions!

[Muhammad Ijaz Khan]

This is exactly what I am doing for now but was wondering if there is a
better way and better way of loading the actual object from key. Thanks for
your comment as it reduced my loneliness :)

On Wed, May 4, 2011 at 12:03 AM, Luca Matteis  wrote:

> Owned relationships are a bit weird in my opinion. I was having your
> same issue. I had a `MyImage` class that was defined inside two
> different classes. This didn't work... I didn't quite understand why
> and so to avoid all weirdness I decided that for more complex
> relationship cases I would always use unowned relationships (defining
> the Key of the reference object instead of the object itself).
>
> So I only use owned relationships when the child object can only exist
> under 1 (and only 1) parent.
>
> Hope this helped... it's only what I experienced... I'm not a JDO expert.
>
>    Luca
>
> On Tue, May 3, 2011 at 10:51 PM, Muhammad Ijaz Khan 
> wrote:
> > Hi,
> > I am building an application and have used JDO for datastore for
> > implementing use cases. Now when I am implementing the backend machine
> which
> > is a bit complex in relationships among objects then I am facing hard
> times
> > with JDO (May be due to lack of my knowledge). I have following questions
> to
> > ask,
> > 1. Can I use reference of objects in more than one classes? For example,
> > Class A is persistent and being used as foreign key in Class B and Class
> C.
> > Do I need to create unowned relationships through Key or can I use some
> > annotation (or something) to mark a field of type A as foreign key? When
> I
> > make a field of type A in class B, and assign an object of class A to it,
> it
> > is stored as new object as child of B :s
> > 2. Can I use objectify for this use case only (mixing with jdo) and will
> it
> > simplify stuff or not, any experience comment?
> > Thanks in advance.
> > regards
> > Ijaz
> >
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Re: [appengine-java] A couple of datastore questions!

[Muhammad Ijaz Khan]

so no other way?

On Wed, May 4, 2011 at 12:08 AM, Muhammad Ijaz Khan wrote:

> This is exactly what I am doing for now but was wondering if there is a
> better way and better way of loading the actual object from key. Thanks for
> your comment as it reduced my loneliness :)
>
> On Wed, May 4, 2011 at 12:03 AM, Luca Matteis  wrote:
>
>> Owned relationships are a bit weird in my opinion. I was having your
>> same issue. I had a `MyImage` class that was defined inside two
>> different classes. This didn't work... I didn't quite understand why
>> and so to avoid all weirdness I decided that for more complex
>> relationship cases I would always use unowned relationships (defining
>> the Key of the reference object instead of the object itself).
>>
>> So I only use owned relationships when the child object can only exist
>> under 1 (and only 1) parent.
>>
>> Hope this helped... it's only what I experienced... I'm not a JDO expert.
>>
>>Luca
>>
>> On Tue, May 3, 2011 at 10:51 PM, Muhammad Ijaz Khan 
>> wrote:
>> > Hi,
>> > I am building an application and have used JDO for datastore for
>> > implementing use cases. Now when I am implementing the backend machine
>> which
>> > is a bit complex in relationships among objects then I am facing hard
>> times
>> > with JDO (May be due to lack of my knowledge). I have following
>> questions to
>> > ask,
>> > 1. Can I use reference of objects in more than one classes? For example,
>> > Class A is persistent and being used as foreign key in Class B and Class
>> C.
>> > Do I need to create unowned relationships through Key or can I use some
>> > annotation (or something) to mark a field of type A as foreign key? When
>> I
>> > make a field of type A in class B, and assign an object of class A to
>> it, it
>> > is stored as new object as child of B :s
>> > 2. Can I use objectify for this use case only (mixing with jdo) and will
>> it
>> > simplify stuff or not, any experience comment?
>> > Thanks in advance.
>> > regards
>> > Ijaz
>> >
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>>
>

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[appengine-java] SQL Service

[Muhammad Ijaz Khan]

Any thoughts on
thisannouncement,
please share :)

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Re: [appengine-java] SQL Service

[Muhammad Ijaz Khan]

Yes, but even when I searched my mailbox I didnt find anything :$

On Tue, Oct 11, 2011 at 4:38 PM, Matthew Jaggard wrote:

> You're not a regular here are you?!
>
> On 11 October 2011 14:24, Muhammad Ijaz Khan  wrote:
> > Any thoughts on this announcement, please share :)
> >
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> >
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