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Producer Listener support refactored for code reuse (Netflix#448)
* Producer Listener support refactored * Address PR feedback
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7 changes: 7 additions & 0 deletions
7
hollow/src/main/java/com/netflix/hollow/api/common/EventListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| package com.netflix.hollow.api.common; | ||
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| /** | ||
| * The top-level type for all listeners. | ||
| */ | ||
| public interface EventListener { | ||
| } |
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hollow/src/main/java/com/netflix/hollow/api/common/ListenerSupport.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package com.netflix.hollow.api.common; | ||
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| import java.util.List; | ||
| import java.util.concurrent.CopyOnWriteArrayList; | ||
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| public class ListenerSupport { | ||
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| protected final CopyOnWriteArrayList<EventListener> eventListeners; | ||
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| public ListenerSupport() { | ||
| eventListeners = new CopyOnWriteArrayList<>(); | ||
| } | ||
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| public ListenerSupport(List<? extends EventListener> listeners) { | ||
| eventListeners = new CopyOnWriteArrayList<>(listeners); | ||
| } | ||
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| public ListenerSupport(ListenerSupport that) { | ||
| eventListeners = new CopyOnWriteArrayList<>(that.eventListeners); | ||
| } | ||
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| public void addListener(EventListener listener) { | ||
| eventListeners.addIfAbsent(listener); | ||
| } | ||
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| public void removeListener(EventListener listener) { | ||
| eventListeners.remove(listener); | ||
| } | ||
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| } |
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44
hollow/src/main/java/com/netflix/hollow/api/common/Listeners.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package com.netflix.hollow.api.common; | ||
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| import com.netflix.hollow.api.producer.listener.VetoableListener; | ||
| import java.util.Arrays; | ||
| import java.util.function.Consumer; | ||
| import java.util.logging.Level; | ||
| import java.util.logging.Logger; | ||
| import java.util.stream.Stream; | ||
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| public abstract class Listeners { | ||
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| private static final Logger LOG = Logger.getLogger(Listeners.class.getName()); | ||
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| protected final EventListener[] listeners; | ||
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| protected Listeners(EventListener[] listeners) { | ||
| this.listeners = listeners; | ||
| } | ||
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| public <T extends EventListener> Stream<T> getListeners(Class<T> c) { | ||
| return Arrays.stream(listeners).filter(c::isInstance).map(c::cast); | ||
| } | ||
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| protected <T extends EventListener> void fire( | ||
| Class<T> c, Consumer<? super T> r) { | ||
| fireStream(getListeners(c), r); | ||
| } | ||
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| protected <T extends EventListener> void fireStream( | ||
| Stream<T> s, Consumer<? super T> r) { | ||
| s.forEach(l -> { | ||
| try { | ||
| r.accept(l); | ||
| } catch (VetoableListener.ListenerVetoException e) { | ||
| throw e; | ||
| } catch (RuntimeException e) { | ||
| if (l instanceof VetoableListener) { | ||
| throw e; | ||
| } | ||
| LOG.log(Level.WARNING, "Error executing listener", e); | ||
| } | ||
| }); | ||
| } | ||
| } |
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