Hello Florin,
first of all, UIMA does not support injections of pre-existing instances. You
are not supposed to access any object instances that are not created within the
context of UIMA. If you can live with the consequences of doing this (i.e. no
UIMA supported scale-out), you can have a look at the following possibilities
that I have implemented as proof-of-concept in uimaFIT:
== SimpleNamedResourceManager ==
The uimaFIT SimpleNamedResourceManager takes a key-value map of names and
instances. When you create your analysis instance with this resource manager,
you can fetch the instances via the UIMA external resource mechanism. Example:
// Create a custom resource manager that allows to inject any Java object as
an external
// dependency
final Map<String, Object> externalContext = new HashMap<String, Object>();
externalContext.put("pojoName2", new AtomicInteger(5));
// Create resource manager
SimpleNamedResourceManager resMgr = new SimpleNamedResourceManager();
resMgr.setExternalContext(externalContext);
// Instantiate component
AnalysisEngine ae = UIMAFramework.produceAnalysisEngine(desc, resMgr, null);
More test code is here:
http://code.google.com/p/uimafit/source/browse/trunk/uimaFIT/src/test/java/org/uimafit/factory/ExternalResourceFactoryTest.java
== SpringContextResourceManager ==
The uimaFIT SpringContextResourceManager makes all Spring beans from a given
Spring application context available via the UIMA external resource mechanism.
Example:
// Acquire application context
ApplicationContext ctx = getApplicationContext();
// Create resource manager
SpringContextResourceManager resMgr = new SpringContextResourceManager();
resMgr.setApplicationContext(ctx);
// Instantiate component
AnalysisEngine ae = UIMAFramework.produceAnalysisEngine(desc, resMgr, null);
See also:
http://code.google.com/p/uimafit/source/browse/trunk/uimaFIT-spring/src/test/java/org/uimafit/spring/SpringContextResourceManagerTest.java
== UIMA Factory Patching ==
This is an invasive mechanism that patches the UIMA framework at runtime so
that every UIMA component that is created is post-processed by a Spring
application context. This means, UIMA components can directly use any
annotations supported by Spring (e.g. @PersistenceContext, …). Only one
application context is supported per JVM because the UIMA framework is
(unfortunately) internally statically configured. This should work, but I
didn't really test it yet beyond the proof-of-concept unit test.
Example code:
http://code.google.com/p/uimafit/source/browse/trunk/uimaFIT-spring/src/test/java/org/uimafit/spring/UimaFactoryInjectionTest.java
Cheers,
-- Richard
Am 20.11.2012 um 14:22 schrieb Spico Florin <[email protected]>:
> Hello!
> I have a connection to data source (triplestore) that is used by
> multiple annotators. With the current implementation of UIMA I have to
> provide this connection in for all these annotators descriptors, making the
> deployment very tedious when switching from one environment to another (for
> example test env to production env).
> I have read the posts from
> http://comments.gmane.org/gmane.comp.apache.uima.general/3340 but still is
> not clear for me how to handle the DI. Basically I would like to inject
> this connection to all of annotators that need it from a single
> configuration file, thus eliminating the mentioned inconvenience.
> Can you please provide what is the best approach for handling this kind
> of problems?
>
> I look forward for your answers.
>
> Regards,
> Florin
>
> P.S. I was thinking to use Spring and ApplicationContext and its
> configuration file. Is this a suitable solution?
--
-------------------------------------------------------------------
Richard Eckart de Castilho
Technical Lead
Ubiquitous Knowledge Processing Lab (UKP-TUD)
FB 20 Computer Science Department
Technische Universität Darmstadt
Hochschulstr. 10, D-64289 Darmstadt, Germany
phone [+49] (0)6151 16-7477, fax -5455, room S2/02/B117
[email protected]
www.ukp.tu-darmstadt.de
Web Research at TU Darmstadt (WeRC) www.werc.tu-darmstadt.de
-------------------------------------------------------------------
