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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.io.InputStream;
import java.net.URL;
import java.util.Map;
import java.util.Properties;
import java.util.function.Consumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Factory to create {@link LRUCache} instances.
*/
public abstract class LRUCacheFactory {
private static final Logger LOGGER = LoggerFactory.getLogger(LRUCacheFactory.class);
private static volatile LRUCacheFactory instance;
public static LRUCacheFactory getInstance() {
if (instance == null) {
synchronized (LRUCacheFactory.class) {
if (instance == null) {
instance = createLRUCacheFactory();
}
}
}
return instance;
}
private static LRUCacheFactory createLRUCacheFactory() {
try {
ClassLoader classLoader = LRUCacheFactory.class.getClassLoader();
URL url = classLoader.getResource("META-INF/services/org/apache/camel/lru-cache-factory");
if (url != null) {
Properties props = new Properties();
try (InputStream is = url.openStream()) {
props.load(is);
}
String clazzName = props.getProperty("class");
Class clazz = classLoader.loadClass(clazzName);
Object factory = clazz.getDeclaredConstructor().newInstance();
return (LRUCacheFactory) factory;
}
} catch (Throwable t) {
LOGGER.warn("Error creating LRUCacheFactory", t);
}
return new DefaultLRUCacheFactory();
}
/**
* 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
*/
public static Map newLRUCache(int maximumCacheSize) {
return getInstance().createLRUCache(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
*/
public static Map newLRUCache(int maximumCacheSize, Consumer onEvict) {
return getInstance().createLRUCache(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
*/
public static Map newLRUCache(int initialCapacity, int maximumCacheSize) {
return getInstance().createLRUCache(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
*/
public static Map newLRUCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
return getInstance().createLRUCache(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
*/
public static Map newLRUSoftCache(int maximumCacheSize) {
return getInstance().createLRUSoftCache(maximumCacheSize);
}
/**
* Constructs an empty LRUSoftCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param initialCapacity the initial capacity.
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
public static Map newLRUSoftCache(int initialCapacity, int maximumCacheSize) {
return getInstance().createLRUSoftCache(initialCapacity, maximumCacheSize);
}
/**
* Constructs an empty LRUSoftCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @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
*/
public static Map newLRUSoftCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
return getInstance().createLRUSoftCache(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
*/
public static Map newLRUWeakCache(int maximumCacheSize) {
return getInstance().createLRUWeakCache(maximumCacheSize);
}
/**
* Constructs an empty LRUWeakCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param initialCapacity the initial capacity.
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
public static Map newLRUWeakCache(int initialCapacity, int maximumCacheSize) {
return getInstance().createLRUWeakCache(initialCapacity, maximumCacheSize);
}
/**
* Constructs an empty LRUWeakCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @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
*/
public static Map newLRUWeakCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction) {
return getInstance().createLRUWeakCache(initialCapacity, maximumCacheSize, stopOnEviction);
}
/**
* 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
*/
public abstract Map createLRUCache(int 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
*/
public abstract Map createLRUCache(int maximumCacheSize, Consumer 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
*/
public abstract Map createLRUCache(int initialCapacity, int 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
*/
public abstract Map createLRUCache(int initialCapacity, int maximumCacheSize, boolean 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
*/
public abstract Map createLRUSoftCache(int maximumCacheSize);
/**
* Constructs an empty LRUSoftCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param initialCapacity the initial capacity.
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
public abstract Map createLRUSoftCache(int initialCapacity, int maximumCacheSize);
/**
* Constructs an empty LRUSoftCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @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
*/
public abstract Map createLRUSoftCache(int initialCapacity, int maximumCacheSize, boolean 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
*/
public abstract Map createLRUWeakCache(int maximumCacheSize);
/**
* Constructs an empty LRUWeakCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @param initialCapacity the initial capacity.
* @param maximumCacheSize the max capacity.
* @throws IllegalArgumentException if the initial capacity is negative
*/
public abstract Map createLRUWeakCache(int initialCapacity, int maximumCacheSize);
/**
* Constructs an empty LRUWeakCache instance with the
* specified maximumCacheSize, and will stop on eviction.
*
* @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
*/
public abstract Map createLRUWeakCache(int initialCapacity, int maximumCacheSize, boolean stopOnEviction);
}
