Thanks for the code. It was something like this that I had in mind. The
one thing I don't like is to pass the type as an 'int' parameter in the
constructor and having a switch statement that creates the actual object
to use. This makes it impossible for others to use their own
implementations of 'RPCServiceClientCreator'. Wouldn't it be better to
pass a 'RPCServiceClientCreator' directly to the constructor?
Eg.
protected AbstractRPCClient(
String url, String service,
RPCServiceClientCreator serviceCreator)
{
...
}
/Nicklas
Pawel Sztromwasser wrote:
> Hi Nicklas,
>
> I had some time and implemented the 'ServiceFactory' functionality.
> Gzipped java files are attached. To summarize changes:
>
> 1) three new classes/interfaces were created (I put them in
> net.sf.basedb.ws.client.added package):
> a) RPCServiceClientCreator - interface containing RPCServiceClient
> getService(String serviceUrl) method for creating RPCServiceClient objects
> b) DefaultRPCServiceClientCreator - factory class implementing
> interface above. It creates RPCServiceClient objects in the way they
> were created in AbstractRPCClient.getService() method.
> c) NoChunkRPCServiceClientCreator - the same as above but with CHUNK
> option set to false.
>
> 2) AbstractRPCClient class uses own RPCServiceClientCreator object to
> create objects in getService() method. Creator object is initialized in
> constructor (type of creator is an argument of additional constructor).
> The creator type can be chosen between values supported by
> AbstractRPCClient, available as public static constants (currently only
> DEFAULT_RPC_SERVICE_CLIENT and NO_CHUNK_RPC_SERVICE_CLIENT). If no
> creator type is supplied, default one is used.
>
> 3) all the subclasses of AbstractRPCClient have additional constructor
> with last argument being type of RPCServiceClientCreator which refers to
> constructor in superclass. This makes possible to choose creator type
> when programming BASE2 webservices clients.
>
> I attached diffs.txt file which contains diff output on
> net/sf/basedb/ws/client/ folders for my version and 2.7.1. Just thought,
> it might be helpful.
>
> I hope the code will be useful.
>
> Best wishes,
> Pawel
>
>
> Nicklas Nordborg wrote:
>> Pawel Sztromwasser wrote:
>>> Hello BASE developers,
>>>
>>> We have been recently trying to enable retrieving some data from
>>> BASE2 installation directly into our 'home made' analysis tool. We
>>> use webservices for that and have to say that you are doing a great
>>> job.
>>
>> Thanks.
>>
>>> We are really looking forward to use them more extensively.
>>>
>>> Recently, when I started testing the tool not only within the local
>>> network I noticed that the webservice client does not switch off
>>> chunking. It results in attached exception cascade. Chunking is on by
>>> default in axis2 and some servers (i.e. our gateway to BASE which
>>> apparently uses HTTP1.0 and not 1.1) have problems with it. The
>>> remedy is to use
>>>
>>> options.setProperty(HTTPConstants.CHUNKED, false);
>>>
>>> in net.sf.basedb.ws.client.AbstractRPCClient.getService(). I don't
>>> know what are the drawbacks of it, but that was the only way I could
>>> run the services in our current setup (BASE2.6 accessible by
>>> proxypass from exposed webserver). Could this option be set off by
>>> default or configurable somewhere? Or maybe there is some other
>>> workaround?
>>
>> I am afraid that I am not very familiar with all possible options that
>> is available in the Axis API:s. There seems to be a lot of them and
>> their Javadoc is not very informative about what many of the options
>> are used for. The CHUNKED option seems to be related to the way HTTP
>> requests are made, but I have to admit that this is the first time I
>> have heard of it. This means that I probably know even less than you
>> about this.
>>
>> I think that, in the future, there may be more requests about being
>> able to set other options. So, it may be better to think ahead and try
>> to figure out some way to be able to do this as easy as possible. With
>> the current BASE API the only workaround that doesn't involve changing
>> the BASE code is to subclass all AbstractRPCClient subclasses and
>> override the 'getService()' method. This is not very elegent since
>> there are several such classes and the new 'getService()' will be
>> added to each one of them.
>>
>> A better approach may be to create a 'ServiceFactory' interface which
>> has a 'createService()' method. The default implementation would then
>> work as the AbstractRPCClient.getService() does today. The last step
>> is to figure out a way to switch to another 'ServiceFactory'
>> implementation either by having a configuration file or by being able
>> to specify it programmatically.
>>
>> I have opened a ticket for this issue
>> http://base.thep.lu.se/ticket/1057. It falls under the 'contributions
>> welcome' category since right now we are forced to prioritize other
>> things.
>>
>> /Nicklas
>>
>>
>>
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>
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