[cdi-dev] [JBoss JIRA] (CDI-653) Introduce BeanManager#getInstances() to ease instance resolution in custom SPI
Antoine Sabot-Durand (JIRA)
issues at jboss.org
Thu Nov 24 08:00:04 EST 2016
Antoine Sabot-Durand created CDI-653:
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Summary: Introduce BeanManager#getInstances() to ease instance resolution in custom SPI
Key: CDI-653
URL: https://issues.jboss.org/browse/CDI-653
Project: CDI Specification Issues
Issue Type: Feature Request
Reporter: Antoine Sabot-Durand
Right now if you need a bean instance in one of your extension or custom SPI (i.e. instance of Bean A is needed to create Bean B) you have to write something like
{code:java}
Set<Bean<?>> beanSet = beanManager.getBeans(MyClass.class);
Bean<?> bean = beanManager.resolve(beanSet);
MyClass instance = (MyClass) beanManager.getReference(bean, MyClass.class, beanManager.createCreationalContext(bean));
{code}
While it can be useful to get thru all this step of type safe resolution, a typical use case is: I need this contextual instance (or these contextual instances) to do conditional action according to its state.
So providing a Bean Manager method returning an {{Instance<Object>}} could be a short cut that could help a lot of advanced developers:
{code:java}
beanManager.getInstances().select(MyClass.class).get();
{code}
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