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/*
* Copyright (C) 2011 The Guava Authors
*
* 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.google.common.cache;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Utility {@link RemovalListener} implementations intended for use in testing.
*
* @author mike nonemacher
*/
@GwtCompatible(emulated = true)
class TestingRemovalListeners {
/**
* Returns a new no-op {@code RemovalListener}.
*/
static <K, V> NullRemovalListener<K, V> nullRemovalListener() {
return new NullRemovalListener<K, V>();
}
/**
* Type-inferring factory method for creating a {@link QueuingRemovalListener}.
*/
@GwtIncompatible("ConcurrentLinkedQueue")
static <K, V> QueuingRemovalListener<K, V> queuingRemovalListener() {
return new QueuingRemovalListener<K,V>();
}
/**
* Type-inferring factory method for creating a {@link CountingRemovalListener}.
*/
static <K, V> CountingRemovalListener<K, V> countingRemovalListener() {
return new CountingRemovalListener<K,V>();
}
/**
* {@link RemovalListener} that adds all {@link RemovalNotification} objects to a queue.
*/
@GwtIncompatible("ConcurrentLinkedQueue")
static class QueuingRemovalListener<K, V>
extends ConcurrentLinkedQueue<RemovalNotification<K, V>> implements RemovalListener<K, V> {
@Override
public void onRemoval(RemovalNotification<K, V> notification) {
add(notification);
}
}
/**
* {@link RemovalListener} that counts each {@link RemovalNotification} it receives, and provides
* access to the most-recently received one.
*/
static class CountingRemovalListener<K, V> implements RemovalListener<K, V> {
private final AtomicInteger count = new AtomicInteger();
private volatile RemovalNotification<K, V> lastNotification;
@Override
public void onRemoval(RemovalNotification<K, V> notification) {
count.incrementAndGet();
lastNotification = notification;
}
public int getCount() {
return count.get();
}
public K getLastEvictedKey() {
return lastNotification.getKey();
}
public V getLastEvictedValue() {
return lastNotification.getValue();
}
public RemovalNotification<K, V> getLastNotification() {
return lastNotification;
}
}
/**
* No-op {@link RemovalListener}.
*/
static class NullRemovalListener<K, V> implements RemovalListener<K, V> {
@Override
public void onRemoval(RemovalNotification<K, V> notification) {}
}
}
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