| /* |
| * 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.jackrabbit.oak.composite; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * This class caches the path strings used in the CompositeNodeState to avoid |
| * keeping too many strings in the memory. |
| */ |
| public class StringCache { |
| |
| private static final int CACHE_SIZE = 1000; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(StringCache.class); |
| |
| private final ConcurrentMap<String, String> cache = new ConcurrentHashMap<>(CACHE_SIZE); |
| |
| private CompositeNodeStoreMonitor monitor; |
| |
| public String get(String path) { |
| if (cache.size() >= CACHE_SIZE && !cache.containsKey(path)) { |
| LOG.debug("Cache size too big. Revise your mount setup."); |
| return path; |
| } |
| return cache.computeIfAbsent(path, (k) -> { |
| if (monitor != null) { |
| monitor.onAddStringCacheEntry(); |
| } |
| return path; |
| }); |
| } |
| |
| public StringCache withMonitor(CompositeNodeStoreMonitor monitor) { |
| this.monitor = monitor; |
| return this; |
| } |
| } |