content: /*
   * Copyright (c) 2012, 2022, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj;
  
  import java.util.Set;
  
  import com.mysql.cj.util.LRUCache;
  
  public class PerConnectionLRUFactory implements CacheAdapterFactory<String, QueryInfo> {
  
      public CacheAdapter<String, QueryInfo> getInstance(Object syncMutex, String url, int cacheMaxSize, int maxKeySize) {
  
          return new PerConnectionLRU(syncMutex, cacheMaxSize, maxKeySize);
      }
  
      class PerConnectionLRU implements CacheAdapter<String, QueryInfo> {
          private final int cacheSqlLimit;
          private final LRUCache<String, QueryInfo> cache;
          private final Object syncMutex;
  
          protected PerConnectionLRU(Object syncMutex, int cacheMaxSize, int maxKeySize) {
              final int cacheSize = cacheMaxSize;
              this.cacheSqlLimit = maxKeySize;
              this.cache = new LRUCache<>(cacheSize);
              this.syncMutex = syncMutex;
          }
  
          public QueryInfo get(String key) {
              if (key == null || key.length() > this.cacheSqlLimit) {
                  return null;
              }
  
              synchronized (this.syncMutex) {
                  return this.cache.get(key);
              }
          }
  
          public void put(String key, QueryInfo value) {
              if (key == null || key.length() > this.cacheSqlLimit) {
                  return;
              }
  
              synchronized (this.syncMutex) {
                  this.cache.put(key, value);
              }
          }
  
          public void invalidate(String key) {
              synchronized (this.syncMutex) {
                  this.cache.remove(key);
              }
          }
  
          public void invalidateAll(Set<String> keys) {
              synchronized (this.syncMutex) {
                  for (String key : keys) {
                      this.cache.remove(key);
                  }
              }
  
          }
  
          public void invalidateAll() {
              synchronized (this.syncMutex) {
                  this.cache.clear();
              }
          }
      }
  }
  