/*
 * Copyright (c) 2012, 2023, 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> {

    @Override
    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;
        }

        @Override
        public QueryInfo get(String key) {
            if (key == null || key.length() > this.cacheSqlLimit) {
                return null;
            }

            synchronized (this.syncMutex) {
                return this.cache.get(key);
            }
        }

        @Override
        public void put(String key, QueryInfo value) {
            if (key == null || key.length() > this.cacheSqlLimit) {
                return;
            }

            synchronized (this.syncMutex) {
                this.cache.put(key, value);
            }
        }

        @Override
        public void invalidate(String key) {
            synchronized (this.syncMutex) {
                this.cache.remove(key);
            }
        }

        @Override
        public void invalidateAll(Set<String> keys) {
            synchronized (this.syncMutex) {
                for (String key : keys) {
                    this.cache.remove(key);
                }
            }
        }

        @Override
        public void invalidateAll() {
            synchronized (this.syncMutex) {
                this.cache.clear();
            }
        }

    }

}
