RxJava Subject unable to resolve generic consumer
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Background:
The following code is from a generic bus from my code that will delegate object of different types (all of them are extending from BaseEvent class) to different consumers.
Problem:
private static PublishSubject<? extends BaseEvent> mPublishSubject;
@SuppressLint("CheckResult")
public void subscribeToEventBus(Class subscribingClass, Class eventToSubscribeTo, Consumer<? extends BaseEvent> subscriber) {
mPublishSubject.subscribe(subscriber);// <---- ERROR HERE
mEventBusSubscribersList.add(new EventBusInfo(subscribingClass, eventToSubscribeTo, subscriber));
}
Error:
error: no suitable method found for subscribe(Consumer<CAP#1>)
method Observable.subscribe(Consumer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Consumer<? super CAP#2>)
method Observable.subscribe(Observer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Observer<? super CAP#2>)
where CAP#1,CAP#2 are fresh type-variables:
CAP#1 extends BaseEvent from capture of ? extends BaseEvent
CAP#2 extends BaseEvent from capture of ? extends BaseEvent
Objective:
I want Consumer<> to accept all the classes that extend from BaseEvent.
I'm not quite sure what exactly am I doing wrong considering my primitive knowledge of Java generics.
java generics rx-java2
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
add a comment |
0
Background:
The following code is from a generic bus from my code that will delegate object of different types (all of them are extending from BaseEvent class) to different consumers.
Problem:
private static PublishSubject<? extends BaseEvent> mPublishSubject;
@SuppressLint("CheckResult")
public void subscribeToEventBus(Class subscribingClass, Class eventToSubscribeTo, Consumer<? extends BaseEvent> subscriber) {
mPublishSubject.subscribe(subscriber);// <---- ERROR HERE
mEventBusSubscribersList.add(new EventBusInfo(subscribingClass, eventToSubscribeTo, subscriber));
}
Error:
error: no suitable method found for subscribe(Consumer<CAP#1>)
method Observable.subscribe(Consumer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Consumer<? super CAP#2>)
method Observable.subscribe(Observer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Observer<? super CAP#2>)
where CAP#1,CAP#2 are fresh type-variables:
CAP#1 extends BaseEvent from capture of ? extends BaseEvent
CAP#2 extends BaseEvent from capture of ? extends BaseEvent
Objective:
I want Consumer<> to accept all the classes that extend from BaseEvent.
I'm not quite sure what exactly am I doing wrong considering my primitive knowledge of Java generics.
java generics rx-java2
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
Please provide the definition ofmPublishSubject.
– akarnokd
Nov 22 '18 at 13:10
@akarnokd I've updated the question
– Umer Farooq
Nov 22 '18 at 13:15
TryPublishSubject<BaseEvent>without the? extends. Java's generics sometimes doesn't allow certain co- and contravariant use cases.
– akarnokd
Nov 22 '18 at 15:00
add a comment |
0
0
0
Background:
The following code is from a generic bus from my code that will delegate object of different types (all of them are extending from BaseEvent class) to different consumers.
Problem:
private static PublishSubject<? extends BaseEvent> mPublishSubject;
@SuppressLint("CheckResult")
public void subscribeToEventBus(Class subscribingClass, Class eventToSubscribeTo, Consumer<? extends BaseEvent> subscriber) {
mPublishSubject.subscribe(subscriber);// <---- ERROR HERE
mEventBusSubscribersList.add(new EventBusInfo(subscribingClass, eventToSubscribeTo, subscriber));
}
Error:
error: no suitable method found for subscribe(Consumer<CAP#1>)
method Observable.subscribe(Consumer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Consumer<? super CAP#2>)
method Observable.subscribe(Observer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Observer<? super CAP#2>)
where CAP#1,CAP#2 are fresh type-variables:
CAP#1 extends BaseEvent from capture of ? extends BaseEvent
CAP#2 extends BaseEvent from capture of ? extends BaseEvent
Objective:
I want Consumer<> to accept all the classes that extend from BaseEvent.
I'm not quite sure what exactly am I doing wrong considering my primitive knowledge of Java generics.
java generics rx-java2
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
Background:
The following code is from a generic bus from my code that will delegate object of different types (all of them are extending from BaseEvent class) to different consumers.
Problem:
private static PublishSubject<? extends BaseEvent> mPublishSubject;
@SuppressLint("CheckResult")
public void subscribeToEventBus(Class subscribingClass, Class eventToSubscribeTo, Consumer<? extends BaseEvent> subscriber) {
mPublishSubject.subscribe(subscriber);// <---- ERROR HERE
mEventBusSubscribersList.add(new EventBusInfo(subscribingClass, eventToSubscribeTo, subscriber));
}
Error:
error: no suitable method found for subscribe(Consumer<CAP#1>)
method Observable.subscribe(Consumer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Consumer<? super CAP#2>)
method Observable.subscribe(Observer<? super CAP#2>) is not applicable
(argument mismatch; Consumer<CAP#1> cannot be converted to Observer<? super CAP#2>)
where CAP#1,CAP#2 are fresh type-variables:
CAP#1 extends BaseEvent from capture of ? extends BaseEvent
CAP#2 extends BaseEvent from capture of ? extends BaseEvent
Objective:
I want Consumer<> to accept all the classes that extend from BaseEvent.
I'm not quite sure what exactly am I doing wrong considering my primitive knowledge of Java generics.
java generics rx-java2
java generics rx-java2
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
edited Nov 22 '18 at 13:15
Umer Farooq
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
asked Nov 22 '18 at 13:07
Umer FarooqUmer Farooq
5,63233254
5,63233254
Please provide the definition ofmPublishSubject.
– akarnokd
Nov 22 '18 at 13:10
@akarnokd I've updated the question
– Umer Farooq
Nov 22 '18 at 13:15
TryPublishSubject<BaseEvent>without the? extends. Java's generics sometimes doesn't allow certain co- and contravariant use cases.
– akarnokd
Nov 22 '18 at 15:00
add a comment |
Please provide the definition ofmPublishSubject.
– akarnokd
Nov 22 '18 at 13:10
@akarnokd I've updated the question
– Umer Farooq
Nov 22 '18 at 13:15
TryPublishSubject<BaseEvent>without the? extends. Java's generics sometimes doesn't allow certain co- and contravariant use cases.
– akarnokd
Nov 22 '18 at 15:00
Please provide the definition of
mPublishSubject.– akarnokd
Nov 22 '18 at 13:10
Please provide the definition of
mPublishSubject.– akarnokd
Nov 22 '18 at 13:10
@akarnokd I've updated the question
– Umer Farooq
Nov 22 '18 at 13:15
@akarnokd I've updated the question
– Umer Farooq
Nov 22 '18 at 13:15
Try
PublishSubject<BaseEvent> without the ? extends. Java's generics sometimes doesn't allow certain co- and contravariant use cases.– akarnokd
Nov 22 '18 at 15:00
Try
PublishSubject<BaseEvent> without the ? extends. Java's generics sometimes doesn't allow certain co- and contravariant use cases.– akarnokd
Nov 22 '18 at 15:00
add a comment |
0
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Please provide the definition of
mPublishSubject.– akarnokd
Nov 22 '18 at 13:10
@akarnokd I've updated the question
– Umer Farooq
Nov 22 '18 at 13:15
Try
PublishSubject<BaseEvent>without the? extends. Java's generics sometimes doesn't allow certain co- and contravariant use cases.– akarnokd
Nov 22 '18 at 15:00