I am trying to transfer data in the form of objects between a gwt client and the app engine server. The objects i transfer need to be persistable (a blog comment for example). as it turns out AppEngine is uncomfortable to include those persistable objects (annotated as #PersistenceCapable) in the gwt module, because the gwt client cant store such date. Also the gwt client cant call a remote procedure with objects which are not concrete. So there is not the option to define interfaces for accessing those classes.
In short:
GWT Client cant work with interfaces, but also not with persistable annotated classes.
My Question is: how can i design an application which transfers stored data between the gwt client and the appengine. This is currently a real problem for me. it seems to me as if the only option is a DataTransferObejct which is just pure sensless code doing the exact thing the data-objects do: storing data.
I used the appengine.datastore Key for the id's of the classes.
Any suggestions ? Or am i getting something wrong ?
What version of GWT are you using? I regularly share data between GWT and GAE using serializable POJOs annotated PersistenceCapable. If you are using Key key, use Long id instead to get it working.
Related
In OSB Layer when the endpoint uri is changed, I need to alert the core group that the endpoint has changed and to review it. I tried SLA Alert rules but it does not have options for it. My question is, the endpoint uri should be saved somewhere in the underlying database. If so what is the schema and the table name to query it.
URI or in fact any other part of OSB artifact is not stored in relational database but rather kept in memory in it's original XML structure. It can be only accessed thru dedicated session management API. Interfaces you will need to use are part o com.bea.wli.sb.management.configuration and com.bea.wli.sb.management.query packages. Unfortunately it is not as straightforward as it sounds, in short, to extract URI information you will need to:
Create session instance(SessionManagementMBean)
Obtain ALSBConfigurationMBean instance that operates on SessionManagementMBean
Create Query object instance(BusinessServiceQuery) an run it on ALSBConfigurationMBean to get ref object to osb artifact of your interest
Invoke getServiceDefinition on your ref object to get XML service
definition
Extract URI from XML service definition with XPath
Downside of this approach is that you are basically pooling configuration each time you want to check if anything has changed.
More information including JAVA/WLST examples can be found in Oracle Fusion Middleware Java API Reference for Oracle Service Bus
There is also a good blog post describing OSB customization with WLST ALSB/OSB customization using WLST
The information about services and all its properties can be obtained via Java API. The API documentation contains sample code, so you can get it up and running quite quickly, see the Querying resources paragraph when following the given link.
We use the API to read the service (both proxy and business) configuration and for simple management.
As long as you only read the properties you do not need to handle management sessions. Once you change the values, you need to start a session and activate it once you are done -- a very similar approach to Service bus console.
I would like to accesss the sitecore DB and items from console application like
Sitecore.Data.Database db = Sitecore.Context.Database
or
Sitecore.Data.Database db = Sitecore.Data.Database.GetDatabase("master")
how do I configure and setup my console application to access the DB as above?
Thanks Everyone for the suggestion, I am really interested in config changes, I used webservice, but it has very limited methods. For example, if I would like create an Item with the template and insert the item with prepopulated value, there is no such option. The reason I am looking for the console apporach is I would like to import the contents from XML or excel sheet and push those to the sitecore tree, eventually use the scheduled task to run the console app periodically. I do not want to copy the entire web.config and app_config. If anyone has already done this, could you please post your steps and necessary config changes?
You have two options I think:
1) Import the Sitecore bits of a website's web.config into your console application's app.config, so that the Sitecore API "just works"
I'm sure I read a blog post about this, but I can't find the reference right now. (I will have another look) But I think the simple but long winded approach is to copy all of the <sitecore/> element and all the separate files it references. I'm fairly sure you can whittle this down to a subset of the config required for data access with a bit of thinking.
2) Don't use the Sitecore API directly, connect to a web service that exposes access to it remotely.
There are a few of these that already exist. Sitecore itself exposes one, Sitecore Rocks has one, and Hedgehog TDS has one too. And you can always write your own (since any web service running inside the Sitecore ASP.Net app can make database calls and report values back and forth - just remember to consider security if this web service might end up exposed externally for any reason)
John West links to some relevant stuff here:
http://www.sitecore.net/Learn/Blogs/Technical-Blogs/John-West-Sitecore-Blog/Posts/2013/09/Getting-Data-Out-of-the-Sitecore-ASPNET-CMS.aspx
-- Edited to add --
I've not found the blog post I remember. But I came across this SO thread:
Accessing Sitecore API from a CLI tool
which refers to this blog post:
http://www.experimentsincode.com/?p=232
which I think gives the info you'll need for option 1.
(And it reminds me that, of course, when you copy the config stuff you have to copy the Sitecore binaries into your app's folder as well)
I would just like to expand on #JermDavis' post and note that Sitecore isn't a big fan of being accessed when not in a web application. However, if you still want to do this, you will need to make sure that you have all of the necessary configuration settings from the web.config and App_Config of your site in your console application's app.config file.
Moreover, you will never be able to call Sitecore.Context in a console application, as the Sitecore Context sits on top of the HttpContext which means that it must be an application and have a valid request for you to use it. What you are looking for is something more along the lines of Sitecore.Configuration.Factory.GetDatabase("master").
Good luck and happy coding :)
This sounds like a job for the Sitecore Item Web API. I use the Sitecore Item Web API whenever I need to access Sitecore data from the master database outside the context of the Content Management server or outside of the context of the Sitecore application. The Web API definitely does not allow you to do everything that the standard Sitecore API does but it can act as a good base and I now extend upon the Web API instead of writing my own custom web services whenever possible.
Thanks to JemDavis's advise.
After I copied the configuration and made changes to config section to get rid of conflicts. I copied almost all of Sitrecore, analytics and lucene dlls, it worked great.
Only thing you have to remember is, copy the app_config folder to the same location where your dlls are.
Thanks again JemDavis....
I'm currently developing a mobile application that will fetch data from server by request (page load) or by notification received (e.g. GCM).
Currently I'm starting to think about how to build the backend for that app.
I thought about using PHP to handle the http requests to my database (mySQL) and to return the response as JSON. As I see it there are many ways to implement such server and would like to hear to hear thoughts about my ideas for implementations:
1. create a single php page that will receive an Enum/Query, execute and send the results.
2. create a php page for every query needs to be made.
Which of my implementations should I use? if none please suggest another. Thank you.
P.S, this server will only use as a fetcher for SQL and push notifications. if you have any suggestion past experience about how to perform it (framework, language, anything that comes to mind) I'd be happy to learn.
You can use PHP REST Data services framework https://github.com/chaturadilan/PHP-Data-Services
I am also looking for information about how to power a web and mobile application that has to get and save data on the server.
I've been working with a PHP framework such as Yii Framework, and I know that this framework, and others, have the possibility to create a API/Web service.
APIS can be SOAP or REST, you should read about the differences of both to see wich is best for mobile. I think the main and most important one is that for SOAP, you need a Soap Client library on the device you are trying to connect, but for REST you just make a http request to the url.
I have built a SOAP API with Yii, is quite easy, and I have use it to communicate between two websites, to get and put data in the same database.
As for your question regarding to use one file or multiple files for every request, in the case of SOAP built on Yii, you have to normally define all the functions available to the API on the server side in only one file(controller) and to connect to that webservice you end up doing:
$client=new SoapClient("url/of/webservice);
$result=$client->methodName($param1, $param2, etc..);
So basically what you get is that from your client, you can run any method defined on the server side with the parameters that you wish.
Assuming that you use to work program php in the "classic way" I suggest you should start learning a framework, there are many reasons to do it but in the end, it is because the code will result more clean and stable, for example:
You shouldn't be writing manual queries (sometimes yes), but you can use the framework's models to handle data validation and storage into the database.
Here are some links:
http://www.larryullman.com/series/learning-the-yii-framework/
http://www.yiiframework.com/doc/guide/1.1/en/topics.webservice
http://www.yiiframework.com/wiki/175/how-to-create-a-rest-api/
As I said, I am also looking to learn how to better power a mobile application, I know this can be achieved with a API, but I don't know if that is the only way.
create a single php page that will receive an Enum/Query, execute and send the results.
I created a single PHP file named api.php that does exactly this, the project is named PHP-CRUD-API. It is quite popular.
It should take care of the boring part of the job and provides a sort of a framework to get started.
Talking about frameworks: you can integrate the script in Laravel, Symfony or SlimPHP to name a few.
I am building a little app that has to communicate with a MongoDB database. Of course there is a web service in front of the DB and I am not trying to access the DB directly from silverlight. At first I thought to have this service return BSON objects in order to have the client manage them.
Is this even possible? It seems like I can't even add the BSON driver's dlls to the Silverlight app (they disappear from References immediately after closing the Add reference dialog, which seems to indicate they are not compatible with Silverlight).
Or maybe I got totally lost and misunderstood it all?? It's my first attempt with MongoDb...
Thanks!!
Why would you want to manipulate BSON objects on the client?
I'd say: let mongodb driver deal with BSON, then convert data to a more usable format (JSON / XML or similar) and pass it to silverlight client.
This is better because:
Client doesn't know about underlying database. What if BSON format got upgraded? You would have to recompile and deploy all clients.
Client doesn't know about underlying database. It communicates with the server using its own JSON (XML) based protocol. You might be able to even switch DB to MySQL and clients won't notice.
I try to get an application running which should interact with a server via RPC (JDO in Google DataStore). So I defined a persistent POJO on the server-side to get it put in the datastore via the PersistenceManager (as shown in the gwt rpc tuts). Everything works fine. But I am not able to receive the callback POJO on the client side because the POJO is only defined on server-side. How can I realize it, that the client knows that kind of object??
(sry for my bad english)
Lars
Put your POJOs in a separate package/directory (e.g. com.example.common) and then add source declaration to your GWT module descriptor (xyz.gwt.xml):
<source path="common"/> //relative to your xyz.gwt.xml location
GWT compiler will then also compile POJOs and they will be seen by your other GWT code.
Edited:
#Lars - now I understand your problem. As I see it you have several options:
If possible use Objectify instead of JDO. Objectify uses pure POJOs and they play nicely with GWT. I use this in my projects. One nice thing that Objectify gives you is #PostLoad & # PrePersist on methods to run some code before/after POJOs are loaded/saved to datastore. I use this to handle serialization of GeoPoint for instance.
Use JDO and make copies of your domain classes. This is a pain but it would work. Use 'transient' java keyword in your server JDO classes to exclude fields you do not want to RPC.
Edit #2: There is a third option that you might prefer:
Create "fake" JDO annotation classes using super-sourcing. This is a common technique to replace classes with a GWT version. Described here: http://fredsa.allen-sauer.com/2009/04/1st-look-at-app-engine-using-jdo.html
You can use DTO(stackoverflow, moar) for transferring data to client.
Basic sample here (method getTenLatestEntries() in your case).
Or you can use some third-party libraries like objectify and stop worry about making DTO`s.