Created
August 12, 2014 21:10
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A CDI Service Locator to be used where injection is not available :(
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package br.com.caelum.financas.util; | |
import java.util.Iterator; | |
import javax.enterprise.context.spi.CreationalContext; | |
import javax.enterprise.inject.spi.Bean; | |
import javax.enterprise.inject.spi.BeanManager; | |
import javax.naming.InitialContext; | |
import javax.naming.NamingException; | |
public class CDILocator { | |
private BeanManager getBeanManager(){ | |
try { | |
return (BeanManager) InitialContext.doLookup("java:comp/BeanManager"); | |
} catch (NamingException e) { | |
throw new RuntimeException(e); | |
} | |
} | |
@SuppressWarnings("unchecked") | |
public <T> T lookup(final Class<T> clazz) { | |
final BeanManager bm = getBeanManager(); | |
final Iterator<Bean<?>> iter = bm.getBeans(clazz).iterator(); | |
if (!iter.hasNext()) { | |
throw new IllegalStateException("CDI BeanManager cannot find an instance of requested type " + clazz.getName()); | |
} | |
final Bean<T> bean = (Bean<T>) iter.next(); | |
final CreationalContext<T> ctx = bm.createCreationalContext(bean); | |
return (T) bm.getReference(bean, clazz, ctx); | |
} | |
} |
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