* Refactor: Genericise request limit strategies and move to OpenSim.Framework.Communications.Limit

1 files changed, 68 insertions, 0 deletions

diff --git a/OpenSim/Framework/Communications/Limit/IRequestLimitStrategy.cs b/OpenSim/Framework/Communications/Limit/IRequestLimitStrategy.cs
new file mode 100644
index 0000000..ded9ffc
--- /dev/null
+++ b/OpenSim/Framework/Communications/Limit/IRequestLimitStrategy.cs
@@ -0,0 +1,68 @@
+/*
+ * 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);
+    }
+}