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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.camel.support;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.Consumer;
import org.apache.camel.support.service.ServiceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DefaultLRUCacheFactory extends LRUCacheFactory {
private final Logger log = LoggerFactory.getLogger(DefaultLRUCacheFactory.class);
/**
* Constructs an empty LRUCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
@Override
public Map createLRUCache(int maximumCacheSize) {
log.trace("Creating LRUCache with maximumCacheSize: {}", maximumCacheSize);
return new SimpleLRUCache<>(maximumCacheSize);
}
/**
* Constructs an empty LRUCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
@Override
public Map createLRUCache(int maximumCacheSize, Consumer onEvict) {
log.trace("Creating LRUCache with maximumCacheSize: {}", maximumCacheSize);
return new SimpleLRUCache<>(16, maximumCacheSize, onEvict);
}
/**
* Constructs an empty LRUCache instance with the
* specified initial capacity, maximumCacheSize, and will stop on eviction.
*
* @param initialCapacity the initial capacity.
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
@Override
public Map createLRUCache(int initialCapacity, int maximumCacheSize) {
log.trace("Creating LRUCache with initialCapacity: {}, maximumCacheSize: {}", initialCapacity, maximumCacheSize);
return new SimpleLRUCache<>(initialCapacity, maximumCacheSize);
}
/**
* Constructs an empty LRUCache instance with the
* specified initial capacity, maximumCacheSize,load factor and ordering mode.
*
* @param initialCapacity the initial capacity.
* @param maximumCacheSize the max capacity.
* @param stopOnEviction whether to stop service on eviction.
* @throws IllegalArgumentException if the initial capacity is negative
*/
@Override
public Map createLRUCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
log.trace("Creating LRUCache with initialCapacity: {}, maximumCacheSize: {}, stopOnEviction: {}", initialCapacity, maximumCacheSize, stopOnEviction);
return new SimpleLRUCache<>(initialCapacity, maximumCacheSize, stopOnEviction);
}
/**
* Constructs an empty LRUSoftCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
@Override
public Map createLRUSoftCache(int maximumCacheSize) {
log.trace("Creating LRUSoftCache with maximumCacheSize: {}", maximumCacheSize);
return new SimpleLRUCache<>(maximumCacheSize);
}
@Override
public Map createLRUSoftCache(int initialCapacity, int maximumCacheSize) {
log.trace("Creating LRUCache with initialCapacity: {}, maximumCacheSize: {}", initialCapacity, maximumCacheSize);
return new SimpleLRUCache<>(initialCapacity, maximumCacheSize);
}
@Override
public Map createLRUSoftCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
log.trace("Creating LRUCache with initialCapacity: {}, maximumCacheSize: {}, stopOnEviction: {}", initialCapacity, maximumCacheSize, stopOnEviction);
return new SimpleLRUCache<>(initialCapacity, maximumCacheSize, stopOnEviction);
}
/**
* Constructs an empty LRUWeakCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
@Override
public Map createLRUWeakCache(int maximumCacheSize) {
log.trace("Creating LRUWeakCache with maximumCacheSize: {}", maximumCacheSize);
return new SimpleLRUCache<>(maximumCacheSize);
}
@Override
public Map createLRUWeakCache(int initialCapacity, int maximumCacheSize) {
log.trace("Creating LRUCache with initialCapacity: {}, maximumCacheSize: {}", initialCapacity, maximumCacheSize);
return new SimpleLRUCache<>(initialCapacity, maximumCacheSize);
}
@Override
public Map createLRUWeakCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
log.trace("Creating LRUCache with initialCapacity: {}, maximumCacheSize: {}, stopOnEviction: {}", initialCapacity, maximumCacheSize, stopOnEviction);
return new SimpleLRUCache<>(initialCapacity, maximumCacheSize, stopOnEviction);
}
private class SimpleLRUCache extends LinkedHashMap {
static final float DEFAULT_LOAD_FACTOR = 0.75f;
private final int maximumCacheSize;
private final Consumer evict;
public SimpleLRUCache(int maximumCacheSize) {
this(16, maximumCacheSize, maximumCacheSize > 0);
}
public SimpleLRUCache(int initialCapacity, int maximumCacheSize) {
this(initialCapacity, maximumCacheSize, maximumCacheSize > 0);
}
public SimpleLRUCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
this(initialCapacity, maximumCacheSize, stopOnEviction ? DefaultLRUCacheFactory.this::doStop : DefaultLRUCacheFactory.this::doNothing);
}
public SimpleLRUCache(int initialCapacity, int maximumCacheSize, Consumer evicted) {
super(initialCapacity, DEFAULT_LOAD_FACTOR, true);
this.maximumCacheSize = maximumCacheSize;
this.evict = Objects.requireNonNull(evicted);
}
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
if (size() > maximumCacheSize) {
V value = eldest.getValue();
evict.accept(value);
return true;
}
return false;
}
}
void doNothing(V value) {
}
void doStop(V value) {
try {
// stop service as its evicted from cache
ServiceHelper.stopService(value);
} catch (Exception e) {
log.warn("Error stopping service: " + value + ". This exception will be ignored.", e);
}
}
}
