/*
* Copyright 2014 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.cache;
/**
* The reason why a cached entry was removed.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public enum RemovalCause {
/**
* The entry was manually removed by the user. This can result from the user invoking any of the
* following methods on the cache or map view.
* <ul>
* <li>{@link Cache#invalidate}</li>
* <li>{@link Cache#invalidateAll(Iterable)}</li>
* <li>{@link Cache#invalidateAll()}</li>
* <li>{@link java.util.Map#remove}</li>
* <li>{@link java.util.Map#computeIfPresent}</li>
* <li>{@link java.util.Map#compute}</li>
* <li>{@link java.util.Map#merge}</li>
* <li>{@link java.util.concurrent.ConcurrentMap#remove}</li>
* </ul>
* A manual removal may also be performed through the key, value, or entry collections views by
* the user invoking any of the following methods.
* <ul>
* <li>{@link java.util.Collection#remove}</li>
* <li>{@link java.util.Collection#removeAll}</li>
* <li>{@link java.util.Collection#removeIf}</li>
* <li>{@link java.util.Collection#retainAll}</li>
* <li>{@link java.util.Iterator#remove}</li>
* </ul>
*/
EXPLICIT {
@Override public boolean wasEvicted() {
return false;
}
},
/**
* The entry itself was not actually removed, but its value was replaced by the user. This can
* result from the user invoking any of the following methods on the cache or map view.
* <ul>
* <li>{@link Cache#put}</li>
* <li>{@link Cache#putAll}</li>
* <li>{@link LoadingCache#getAll}</li>
* <li>{@link LoadingCache#refresh}</li>
* <li>{@link java.util.Map#put}</li>
* <li>{@link java.util.Map#putAll}</li>
* <li>{@link java.util.Map#replace}</li>
* <li>{@link java.util.Map#computeIfPresent}</li>
* <li>{@link java.util.Map#compute}</li>
* <li>{@link java.util.Map#merge}</li>
* </ul>
*/
REPLACED {
@Override public boolean wasEvicted() {
return false;
}
},
/**
* The entry was removed automatically because its key or value was garbage-collected. This
* can occur when using {@link Caffeine#weakKeys}, {@link Caffeine#weakValues}, or
* {@link Caffeine#softValues}.
*/
COLLECTED {
@Override public boolean wasEvicted() {
return true;
}
},
/**
* The entry's expiration timestamp has passed. This can occur when using
* {@link Caffeine#expireAfterWrite}, {@link Caffeine#expireAfterAccess},
* or {@link Caffeine#expireAfter(Expiry)}.
*/
EXPIRED {
@Override public boolean wasEvicted() {
return true;
}
},
/**
* The entry was evicted due to size constraints. This can occur when using
* {@link Caffeine#maximumSize} or {@link Caffeine#maximumWeight}.
*/
SIZE {
@Override public boolean wasEvicted() {
return true;
}
};
/**
* Returns {@code true} if there was an automatic removal due to eviction (the cause is neither
* {@link #EXPLICIT} nor {@link #REPLACED}).
*
* @return if the entry was automatically removed due to eviction
*/
public abstract boolean wasEvicted();
}