Re: HTML5 local object persistence for GWT
Hi,
just a remark: You can now use direct object references in your
persistent class:
class A {
long id;
B b;
}
if A and B are Persistable. b will be put and get EAGER, so beware of
performance issues!
I plan to support a Lazy Annotation that instantiates only empty
objects with the ID and can be fetched later.
Also Collections of objects will be supported.
Circular references will also be handled properly.
Please use http://groups.google.com/group/mobile-objects-discuss for
further discussions.
On 30 Aug., 14:15, J.Ganesan j.gane...@datastoregwt.com wrote:
Congratulations. The simplicity is striking. This library really gives
an object orientation tinge to persistence. I believe this library is
a natural extension to GWT programming model.
It is useful for those projects not demanding a deep object graph. Of
course, when this library is extended to take care of
java.util.Collections and of circular references, it will be lot more
useful.
J.Ganesanwww.DataStoreGwt.com
On Aug 29, 9:24 pm, joergviola joerg.vi...@googlemail.com wrote:
Hello,
I want to announce a new lib for HTML5 gwt apps:
https://code.google.com/p/mobile-objects/
Using it, you can directly persist objects to local HTML5 storage or
database, whatever is available.
Moreover, synchronisation to a server is possible, currently to GAE using
objectify.
GWT generators are used to generate class descriptors for the persistent
classes.
At runtime, these descriptors are used to create JSON for storage or an SQL
for database persistence.
The persistence model currently is quite simple and modelled after the
objectify API.
I would be happy if someone just could check the concept and tell whether
this lib would be useful.
Thanks a lot, Joerg
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Re: HTML5 local object persistence for GWT
Yepp, something like that would work.
I am currently working on persisting object graphs eagerly.
When I come across the local storage I will take a look at piriti
again.
Please use http://groups.google.com/group/mobile-objects-discuss for
further discussions.
On 31 Aug., 11:20, Harald Pehl harald.p...@googlemail.com wrote:
I started Piriti as an XML mapper for GWT back in January 2010. JSON mapping
was introduced some months later. So it has no relation to AutoBeans. It's
just an alternative way to (de)serialize POJOs. Although the output is very
similar, Piriti is not based on marker interfaces, but real POJOs. See
alsohttp://code.google.com/p/piriti/wiki/Comparisonfor a comparison with other
mappers.
The idea off hooking into graph traversal is an interesting concept. I would
suggest events and handlers to get notified when a model / property is
written to JSON resp. read from JSON:
public interface JsonWriterT {
...
HandlerRegistration addWriteModelHandler(WriteModelHandlerT handler);
HandlerRegistration addWritePropertyHandler(WritePropertyHandler?
handler);
...
}
public interface WriteModelHandlerT extends EventHandler {
void onBeforeWriteModel(WriteModelEventT event);
void onAfterWriteModel(WriteModelEventT event);
}
public interface WritePropertyHandlerT extends EventHandler {
void onBeforeWriteProperty(WritePropertyEventT event);
void onAfterWriteProperty(WritePropertyEventT event);
void onSkipProperty(WritePropertyEventT event);
}
What do you think?
- Harald
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Aw: Re: HTML5 local object persistence for GWT
Thanks Harald Hey - Piriti is nice - if I only knew about it some months earlier, when I had to write a JSON-based API to a GWT App... How does it compare to AutoBeans? As of using Piriti for local storage: Each object instance in a graph has to be stored individually in the storage. So we would need some means of hooking into to piriti graph traversal to store the instance, right? If that would be possible, use of pirity could make the job ob persisting whole graphs a lot easier. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/98_sQ6ioRFgJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Aw: Re: HTML5 local object persistence for GWT
I started Piriti as an XML mapper for GWT back in January 2010. JSON mapping
was introduced some months later. So it has no relation to AutoBeans. It's
just an alternative way to (de)serialize POJOs. Although the output is very
similar, Piriti is not based on marker interfaces, but real POJOs. See also
http://code.google.com/p/piriti/wiki/Comparison for a comparison with other
mappers.
The idea off hooking into graph traversal is an interesting concept. I would
suggest events and handlers to get notified when a model / property is
written to JSON resp. read from JSON:
public interface JsonWriterT {
...
HandlerRegistration addWriteModelHandler(WriteModelHandlerT handler);
HandlerRegistration addWritePropertyHandler(WritePropertyHandler?
handler);
...
}
public interface WriteModelHandlerT extends EventHandler {
void onBeforeWriteModel(WriteModelEventT event);
void onAfterWriteModel(WriteModelEventT event);
}
public interface WritePropertyHandlerT extends EventHandler {
void onBeforeWriteProperty(WritePropertyEventT event);
void onAfterWriteProperty(WritePropertyEventT event);
void onSkipProperty(WritePropertyEventT event);
}
What do you think?
- Harald
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Re: HTML5 local object persistence for GWT
Congratulations. The simplicity is striking. This library really gives an object orientation tinge to persistence. I believe this library is a natural extension to GWT programming model. It is useful for those projects not demanding a deep object graph. Of course, when this library is extended to take care of java.util.Collections and of circular references, it will be lot more useful. J.Ganesan www.DataStoreGwt.com On Aug 29, 9:24 pm, joergviola joerg.vi...@googlemail.com wrote: Hello, I want to announce a new lib for HTML5 gwt apps: https://code.google.com/p/mobile-objects/ Using it, you can directly persist objects to local HTML5 storage or database, whatever is available. Moreover, synchronisation to a server is possible, currently to GAE using objectify. GWT generators are used to generate class descriptors for the persistent classes. At runtime, these descriptors are used to create JSON for storage or an SQL for database persistence. The persistence model currently is quite simple and modelled after the objectify API. I would be happy if someone just could check the concept and tell whether this lib would be useful. Thanks a lot, Joerg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: HTML5 local object persistence for GWT
Thank you for this review. Indeed, the coverage of usually used object reference semantics is crucial. On the other hand, this is a long way to go... Consider for example the complex semantics to eager and lazy loading of references. My direction would be: Try allowing List and arrays as to-many field types. Follow objectify in that Keys as values mean lazy loading (which then has to be done manually). Try allowing real references, but only with eager semantics - then taking properly care of circular references. On Aug 30, 2:15 pm, J.Ganesan j.gane...@datastoregwt.com wrote: Congratulations. The simplicity is striking. This library really gives an object orientation tinge to persistence. I believe this library is a natural extension to GWT programming model. It is useful for those projects not demanding a deep object graph. Of course, when this library is extended to take care of java.util.Collections and of circular references, it will be lot more useful. J.Ganesanwww.DataStoreGwt.com On Aug 29, 9:24 pm, joergviola joerg.vi...@googlemail.com wrote: Hello, I want to announce a new lib for HTML5 gwt apps: https://code.google.com/p/mobile-objects/ Using it, you can directly persist objects to local HTML5 storage or database, whatever is available. Moreover, synchronisation to a server is possible, currently to GAE using objectify. GWT generators are used to generate class descriptors for the persistent classes. At runtime, these descriptors are used to create JSON for storage or an SQL for database persistence. The persistence model currently is quite simple and modelled after the objectify API. I would be happy if someone just could check the concept and tell whether this lib would be useful. Thanks a lot, Joerg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: HTML5 local object persistence for GWT
Really impressive work. Well done pal :) 2011/8/30 joergviola joerg.vi...@googlemail.com Thank you for this review. Indeed, the coverage of usually used object reference semantics is crucial. On the other hand, this is a long way to go... Consider for example the complex semantics to eager and lazy loading of references. My direction would be: Try allowing List and arrays as to-many field types. Follow objectify in that Keys as values mean lazy loading (which then has to be done manually). Try allowing real references, but only with eager semantics - then taking properly care of circular references. On Aug 30, 2:15 pm, J.Ganesan j.gane...@datastoregwt.com wrote: Congratulations. The simplicity is striking. This library really gives an object orientation tinge to persistence. I believe this library is a natural extension to GWT programming model. It is useful for those projects not demanding a deep object graph. Of course, when this library is extended to take care of java.util.Collections and of circular references, it will be lot more useful. J.Ganesanwww.DataStoreGwt.com On Aug 29, 9:24 pm, joergviola joerg.vi...@googlemail.com wrote: Hello, I want to announce a new lib for HTML5 gwt apps: https://code.google.com/p/mobile-objects/ Using it, you can directly persist objects to local HTML5 storage or database, whatever is available. Moreover, synchronisation to a server is possible, currently to GAE using objectify. GWT generators are used to generate class descriptors for the persistent classes. At runtime, these descriptors are used to create JSON for storage or an SQL for database persistence. The persistence model currently is quite simple and modelled after the objectify API. I would be happy if someone just could check the concept and tell whether this lib would be useful. Thanks a lot, Joerg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- GWT API for non Java based platforms http://code.google.com/p/gwt4air/ http://www.gwt4air.appspot.com/ -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Aw: Re: HTML5 local object persistence for GWT
Well doe Joerg! The API is straightforward but very powerful. I noticed in JSONEntityWriter and JSONEntityReader you (de)serialize the entites using the GWT JSON API. I'm the author of Piriti a JSON / XML mapper for GWT: http://code.google.com/p/piriti/. Piriti is able to (de)serialize whole object graphs from/to JSON. References, collections, arrays, primitive and basic data types are supported (see http://code.google.com/p/piriti/wiki/SupportedTypes for a full list). Maybe we can join forces and add something like a PiritiEntityWriter / PiritiEntityReader? What do you think? - Harald -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/ST5pTUGiRvUJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
HTML5 local object persistence for GWT
Hello, I want to announce a new lib for HTML5 gwt apps: https://code.google.com/p/mobile-objects/ Using it, you can directly persist objects to local HTML5 storage or database, whatever is available. Moreover, synchronisation to a server is possible, currently to GAE using objectify. GWT generators are used to generate class descriptors for the persistent classes. At runtime, these descriptors are used to create JSON for storage or an SQL for database persistence. The persistence model currently is quite simple and modelled after the objectify API. I would be happy if someone just could check the concept and tell whether this lib would be useful. Thanks a lot, Joerg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/kcbaGOW8wxgJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
