[appengine-java] Multi user chat room
Hi, Im very new to this GAE services. So far I managed to run my apps on GAE. Im trying to add multi-user chat on my app. Ive been trying to search how to implement this-both using XMPP and Channel API. Im interested on the latter. The problem is I couldnt find any tutorial or example to begin with.. the channel API look simpler but whe I visited other people blog/tutorial it doesnt really show how to do it.. can someone help me please. Thanks -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: Entity modelling
Hi, Thanks for your reply. The category is not related to the group - category holds value like Science/Tech/Music while Group stores value like Teens/Kids/Adult. The reason I have these two fields I want to be able to sort the forum according to category and follow by group. So in the forum object I have (field1, ... fieldN, forumcategoryid, forumgroupid) and forumcategory object (forumcategoryid, field1...) and forumgroup object (forumgroupid, field1...). for small app, I think even without mappedBy annonation in relevant class the application will still work. I just have to tie up everything at app level, any advice? btw, ive gone through the links u given, but there isnt enough app-like example on one-to-many relationship (only the simple guestbook example) On Tue, Aug 9, 2011 at 5:07 PM, Simon Knott wrote: > Given that the target GAE datastore should be optimised for reads, since > writes are expensive, normalization of data is by no means the way to go. > > Are Categories and Groups joined in any way? i.e. Has a specific Category > got a set of groups, or the other way around? If not, then storing the > group/category as a property within the Forum seems fine to me. > > I would strongly suggest that you read up on the datastore before > proceeding however - the GAE datastore doesn't really consist of tables. I > would read the following docs in their entirety before doing too much more > work: > >- Datastore Overview - >http://code.google.com/appengine/articles/datastore/overview.html >- Java Datastore Docs - >http://code.google.com/appengine/docs/java/datastore/ >- Objectify Docs - These give a good overview of restrictions and best >practices when working with the datastore >http://code.google.com/p/objectify-appengine/wiki/Concepts?tm=6 > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-appengine-java/-/XdtplUMwmLAJ. > > To post to this group, send email to > google-appengine-java@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Entity modelling
Hello.
I need some help. Assuming I have three tables/objects: forum, forum
category, forum group.
Forum - stores all topics posted by user. This object/table relates to other
tables including the aforementioned tables.
Forum category - stores the category whether science, technology, etc.
forumcategoryid is the primary key
Forum group - stores the group e.g. Adult, Teens, etc forumgroupid is the
primary key.
In my Forum data model:
//all necessary imports plus declarations
I'm storing forumcategoryid and forumgroupid in the table Forum so that I
can link Forum Category & Forum Group. When user post a new topic, the user
select the category and group from the dropdown box which are pulled from
Forum category and Forum Group. Do I need to do something like this in the
Forum entity class:
..
private ForumCategory forumCategory;
private ForumGroup forumGroup;
//getter and setters for these two; category & group
public Forum (list of all fields)
{
...
}
I'm all confused. When user post a topic, it needs to be in one of those
existing category and group. User is not allowed to create new category or
group. So embedding the forum category & group in Forum entity is pointless?
Another solution that I can think of, since the value of forumcategoryid and
forumgroupid are pulled from other table, i just might use these values and
save it into data store as part of Forum properties (so in the forum entity
I will have two additional fields named private String forumCategoryID,
private String forumGroupID).. Can someone help me or point me in right
direction? I'm a total beginner on this.
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