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/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;

namespace OpenSim.Framework.Communications.Limit
{
    /// <summary>
    /// Interface for strategies that can limit requests from the client.  Currently only used in the
    /// texture modules to deal with repeated requests for certain textures.  However, limiting strategies
    /// could be used with other requests.
    /// </summary>    
    public interface IRequestLimitStrategy<TId>
    {           
        /// <summary>
        /// Should the request be allowed?  If the id is not monitored, then the request is always allowed.
        /// Otherwise, the strategy criteria will be applied.
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        bool AllowRequest(TId id);
        
        /// <summary>
        /// Has the request been refused just once?
        /// </summary>
        /// <returns>False if the request has not yet been refused, or if the request has been refused more
        /// than once.</returns>
        bool IsFirstRefusal(TId id);
        
        /// <summary>
        /// Start monitoring for future AllowRequest calls.  If the id is already monitored, then monitoring
        /// continues.
        /// </summary>
        /// <param name="id"></param>
        void MonitorRequests(TId id);
        
        /// <summary>
        /// Is the id being monitored?
        /// </summary>
        /// <param name="uuid"> </param>
        /// <returns></returns>
        bool IsMonitoringRequests(TId id);
    }
}