ActiveSessionList.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed 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.
//

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace Deveel.Data {
    public sealed class ActiveSessionList : IEnumerable<ISession> {
        private readonly List<ISession> sessions;

        public ActiveSessionList(IDatabase database) {
            if (database == null)
                throw new ArgumentNullException("database");

            Database = database;
            sessions = new List<ISession>();
        }

        public IDatabase Database { get; private set; }

        public bool IsUserActive(string userName) {
            lock (this) {
                return sessions.Any(x => x.User.Name == userName);
            }
        }

        public int Count {
            get {
                lock (this) {
                    return sessions.Count;
                }
            }
        }

        public ISession this[int index] {
            get {
                lock (this) {
                    return sessions[index];
                }
            }
        }

        public IEnumerator<ISession> GetEnumerator() {
            lock (this) {
                return sessions.GetEnumerator();
            }
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return GetEnumerator();
        }

        internal bool Add(ISession session) {
            lock (this) {
                if (sessions.Contains(session))
                    return false;

                sessions.Add(session);
                return true;
            }
        }

        internal void Remove(ISession session) {
            lock (this) {
                sessions.Remove(session);
            }
        }
    }
}