| /* |
| * 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.bcel.util; |
| |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| import org.apache.bcel.classfile.JavaClass; |
| |
| /** |
| * Maintains a least-recently-used (LRU) cache of {@link JavaClass} with maximum size {@code cacheSize}. |
| * |
| * <p> |
| * This repository supports a class path consisting of too many JAR files to handle in {@link ClassPathRepository} or |
| * {@link MemorySensitiveClassPathRepository} without causing {@code OutOfMemoryError}. |
| * </p> |
| * |
| * @since 6.4.0 |
| */ |
| public class LruCacheClassPathRepository extends AbstractClassPathRepository { |
| |
| private final LinkedHashMap<String, JavaClass> loadedClasses; |
| |
| public LruCacheClassPathRepository(final ClassPath path, final int cacheSize) { |
| super(path); |
| |
| if (cacheSize < 1) { |
| throw new IllegalArgumentException("cacheSize must be a positive number."); |
| } |
| final int initialCapacity = (int) (0.75 * cacheSize); |
| final boolean accessOrder = true; // Evicts least-recently-accessed |
| loadedClasses = new LinkedHashMap<String, JavaClass>(initialCapacity, cacheSize, accessOrder) { |
| |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| protected boolean removeEldestEntry(final Map.Entry<String, JavaClass> eldest) { |
| return size() > cacheSize; |
| } |
| }; |
| } |
| |
| @Override |
| public JavaClass findClass(final String className) { |
| return loadedClasses.get(className); |
| } |
| |
| @Override |
| public void storeClass(final JavaClass javaClass) { |
| // Not storing parent's _loadedClass |
| loadedClasses.put(javaClass.getClassName(), javaClass); |
| javaClass.setRepository(this); |
| } |
| |
| @Override |
| public void removeClass(final JavaClass javaClass) { |
| loadedClasses.remove(javaClass.getClassName()); |
| } |
| |
| @Override |
| public void clear() { |
| loadedClasses.clear(); |
| } |
| } |