/*
* 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.testing;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.RejectedExecutionException;
import com.github.benmanes.caffeine.cache.RemovalCause;
import com.github.benmanes.caffeine.cache.RemovalListener;
/**
* Some common removal listener implementations for tests.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class RemovalListeners {
private RemovalListeners() {}
/** A removal listener that stores the notifications for inspection. */
public static <K, V> RemovalListener<K, V> consuming() {
return new ConsumingRemovalListener<>();
}
/** A removal listener that throws an exception if a notification arrives. */
public static <K, V> RemovalListener<K, V> rejecting() {
return new RejectingRemovalListener<>();
}
public static final class RejectingRemovalListener<K, V>
implements RemovalListener<K, V>, Serializable {
private static final long serialVersionUID = 1L;
public boolean reject = true;
public int rejected;
@Override
public void onRemoval(K key, V value, RemovalCause cause) {
if (reject) {
rejected++;
throw new RejectedExecutionException("Rejected eviction of " +
new RemovalNotification<>(key, value, cause));
}
}
}
public static final class ConsumingRemovalListener<K, V>
implements RemovalListener<K, V>, Serializable {
private static final long serialVersionUID = 1L;
private final List<RemovalNotification<K, V>> evicted;
public ConsumingRemovalListener() {
this.evicted = new ArrayList<>();
}
@Override
public synchronized void onRemoval(K key, V value, RemovalCause cause) {
evicted.add(new RemovalNotification<>(key, value, cause));
}
public List<RemovalNotification<K, V>> evicted() {
return evicted;
}
}
}