/*
* Copyright 2015 Ben Manes. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.benmanes.caffeine.jcache.event;
import static java.util.Objects.requireNonNull;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nonnull;
import javax.cache.event.CacheEntryCreatedListener;
import javax.cache.event.CacheEntryEvent;
import javax.cache.event.CacheEntryExpiredListener;
import javax.cache.event.CacheEntryListener;
import javax.cache.event.CacheEntryRemovedListener;
import javax.cache.event.CacheEntryUpdatedListener;
import javax.cache.event.EventType;
/**
* A decorator that dispatches the event iff the listener supports that action.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
final class EventTypeAwareListener<K, V> implements CacheEntryCreatedListener<K, V>,
CacheEntryUpdatedListener<K, V>, CacheEntryRemovedListener<K, V>,
CacheEntryExpiredListener<K, V> {
static final Logger logger = Logger.getLogger(EventTypeAwareListener.class.getName());
final CacheEntryListener<? super K, ? super V> listener;
public EventTypeAwareListener(CacheEntryListener<? super K, ? super V> listener) {
this.listener = requireNonNull(listener);
}
/** Returns if the backing listener consumes this type of event. */
public boolean isCompatible(@Nonnull EventType eventType) {
switch (eventType) {
case CREATED:
return (listener instanceof CacheEntryCreatedListener<?, ?>);
case UPDATED:
return (listener instanceof CacheEntryUpdatedListener<?, ?>);
case REMOVED:
return (listener instanceof CacheEntryRemovedListener<?, ?>);
case EXPIRED:
return (listener instanceof CacheEntryExpiredListener<?, ?>);
}
throw new IllegalStateException("Unknown event type: " + eventType);
}
/** Processes the event and logs if an exception is thrown. */
public void dispatch(@Nonnull JCacheEntryEvent<K, V> event) {
try {
switch (event.getEventType()) {
case CREATED:
onCreated(event);
break;
case UPDATED:
onUpdated(event);
break;
case REMOVED:
onRemoved(event);
break;
case EXPIRED:
onExpired(event);
break;
}
throw new IllegalStateException("Unknown event type: " + event.getEventType());
} catch (Exception e) {
logger.log(Level.WARNING, null, e);
} catch (Throwable t) {
logger.log(Level.SEVERE, null, t);
}
}
@Override
@SuppressWarnings("unchecked")
public void onCreated(Iterable<CacheEntryEvent<? extends K, ? extends V>> events) {
if (listener instanceof CacheEntryCreatedListener<?, ?>) {
((CacheEntryCreatedListener<K, V>) listener).onCreated(events);
}
}
@Override
@SuppressWarnings("unchecked")
public void onUpdated(Iterable<CacheEntryEvent<? extends K, ? extends V>> events) {
if (listener instanceof CacheEntryUpdatedListener<?, ?>) {
((CacheEntryUpdatedListener<K, V>) listener).onUpdated(events);
}
}
@Override
@SuppressWarnings("unchecked")
public void onRemoved(Iterable<CacheEntryEvent<? extends K, ? extends V>> events) {
if (listener instanceof CacheEntryRemovedListener<?, ?>) {
((CacheEntryRemovedListener<K, V>) listener).onRemoved(events);
}
}
@Override
@SuppressWarnings("unchecked")
public void onExpired(Iterable<CacheEntryEvent<? extends K, ? extends V>> events) {
if (listener instanceof CacheEntryExpiredListener<?, ?>) {
((CacheEntryExpiredListener<K, V>) listener).onExpired(events);
}
}
}