SQLiteConnectionPool.cs

//
// Copyright (c) 2012 Krueger Systems, Inc.
// Copyright (c) 2013 Øystein Krog (oystein.krog@gmail.com)
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

using System;
using System.Collections.Generic;
using JetBrains.Annotations;
using SQLite.Net.Interop;

namespace SQLite.Net
{
    [Obsolete]
    public class SQLiteConnectionPool
    {
        private readonly Dictionary<string, Entry> _entries = new Dictionary<string, Entry>();
        private readonly object _entriesLock = new object();
        private readonly ISQLitePlatform _sqlitePlatform;

        [PublicAPI]
        public SQLiteConnectionPool(ISQLitePlatform sqlitePlatform)
        {
            _sqlitePlatform = sqlitePlatform;
        }

        [PublicAPI]
        public SQLiteConnectionWithLock GetConnection(SQLiteConnectionString connectionString)
        {
            lock (_entriesLock)
            {
                Entry entry;
                var key = connectionString.ConnectionString;

                if (!_entries.TryGetValue(key, out entry))
                {
                    entry = new Entry(_sqlitePlatform, connectionString);
                    _entries[key] = entry;
                }

                return entry.Connection;
            }
        }

        /// <summary>
        ///     Closes all connections managed by this pool.
        /// </summary>
        [PublicAPI]
        public void Reset()
        {
            lock (_entriesLock)
            {
                foreach (var entry in _entries.Values)
                {
                    entry.OnApplicationSuspended();
                }
                _entries.Clear();
            }
        }

        /// <summary>
        ///     Call this method when the application is suspended.
        /// </summary>
        /// <remarks>Behaviour here is to close any open connections.</remarks>
        [PublicAPI]
        public void ApplicationSuspended()
        {
            Reset();
        }

        private class Entry
        {
            public Entry(ISQLitePlatform sqlitePlatform, SQLiteConnectionString connectionString)
            {
                ConnectionString = connectionString;
                Connection = new SQLiteConnectionWithLock(sqlitePlatform, connectionString);
            }

            public SQLiteConnectionString ConnectionString { get; private set; }
            public SQLiteConnectionWithLock Connection { get; private set; }

            public void OnApplicationSuspended()
            {
                Connection.Dispose();
                Connection = null;
            }
        }
    }
}