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https://issues.apache.org/jira/browse/POLYGENE-306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16453754#comment-16453754
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Niclas Hedhman edited comment on POLYGENE-306 at 4/26/18 9:34 AM:
------------------------------------------------------------------
A complete example of what I would like to be able to do, which is the ability
to add an annotation that controls the invocation of Concerns. In this show
case it is to disallow the invocation of "HashMap.put()" in a very generic
fashion.
{code:java}
public class DynamicAnnotationTest extends AbstractPolygeneTest
{
@Override
public void assemble( ModuleAssembly module )
throws AssemblyException
{
module.services( Map.class )
.withMixins( HashMap.class )
.withConcerns( DisabledMethodConcern.class );
module.forMixin( HashMap.class )
.annotations( annotation( Disabled.class ) )
.put( null, null );
}
@Test
void test1()
throws Exception
{
Map underTest = serviceFinder.findService( Map.class ).get();
assertThrows( DisabledMethodException.class, () -> underTest.put( "1",
"2" ) );
}
@Target( ElementType.METHOD )
@Retention( RetentionPolicy.RUNTIME )
public @interface Disabled
{
}
@AppliesTo( Disabled.class )
public static class DisabledMethodConcern extends
ConcernOf<InvocationHandler>
implements InvocationHandler
{
@Override
public Object invoke( Object o, Method method, Object[] objects )
throws Throwable
{
throw new DisabledMethodException();
}
}
public static class DisabledMethodException extends RuntimeException
{
}
}
{code}
was (Author: niclas):
A complete example of what I would like to be able to do, which is the ability
to add an annotation that controls the invocation of Concerns.
{code:java}
public class DynamicAnnotationTest extends AbstractPolygeneTest
{
@Override
public void assemble( ModuleAssembly module )
throws AssemblyException
{
module.services( Map.class )
.withMixins( HashMap.class )
.withConcerns( DisabledMethodConcern.class );
module.forMixin( HashMap.class )
.annotations( annotation( Disabled.class ) )
.put( null, null );
}
@Test
void test1()
throws Exception
{
Map underTest = serviceFinder.findService( Map.class ).get();
assertThrows( DisabledMethodException.class, () -> underTest.put( "1",
"2" ) );
}
@Target( ElementType.METHOD )
@Retention( RetentionPolicy.RUNTIME )
public @interface Disabled
{
}
@AppliesTo( Disabled.class )
public static class DisabledMethodConcern extends
ConcernOf<InvocationHandler>
implements InvocationHandler
{
@Override
public Object invoke( Object o, Method method, Object[] objects )
throws Throwable
{
throw new DisabledMethodException();
}
}
public static class DisabledMethodException extends RuntimeException
{
}
}
{code}
> Dynamic Method Annotations at bootstrap
> ---------------------------------------
>
> Key: POLYGENE-306
> URL: https://issues.apache.org/jira/browse/POLYGENE-306
> Project: Polygene
> Issue Type: New Feature
> Reporter: Niclas Hedhman
> Priority: Major
>
> Currently we can manipulate types pretty much freely at bootstrap, but we
> can't add annotations to methods, which would be useful for instance when
> working with external types not under one's control.
> This will need to add metaInfo to Property and add the annotation there,
> rather than trying to compile it into the method itself.
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