From 60e45418654975d27633a683b57c7013b98a23e3 Mon Sep 17 00:00:00 2001
From: Tleiades Hax
Date: Thu, 25 Oct 2007 09:26:47 +0000
Subject: Created a generic RESTClient component, which simplifies querying for
 resources from REST based web-services.

Currently it supports a barebones scheme for specifying the path of the resource and querying asynchroneously. POST method is still wacky and a good solid scheme for handling timeout still remain.


---
 .../RestClient/GenericAsyncResult.cs               | 163 +++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 OpenSim/Framework/Communications/RestClient/GenericAsyncResult.cs

(limited to 'OpenSim/Framework/Communications/RestClient/GenericAsyncResult.cs')

diff --git a/OpenSim/Framework/Communications/RestClient/GenericAsyncResult.cs b/OpenSim/Framework/Communications/RestClient/GenericAsyncResult.cs
new file mode 100644
index 0000000..4be459d
--- /dev/null
+++ b/OpenSim/Framework/Communications/RestClient/GenericAsyncResult.cs
@@ -0,0 +1,163 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+
+namespace OpenSim.Framework.RestClient
+{
+    internal class SimpleAsyncResult : IAsyncResult
+    {
+
+        private readonly AsyncCallback m_callback;
+
+        /// <summary>
+        /// Is process completed?
+        /// </summary>
+        /// <remarks>Should really be boolean, but VolatileRead has no boolean method</remarks>
+        private byte m_completed;
+
+        /// <summary>
+        /// Did process complete synchroneously?
+        /// </summary>
+        /// <remarks>I have a hard time imagining a scenario where this is the case, again, same issue about
+        /// booleans and VolatileRead as m_completed
+        /// </remarks>
+        private byte m_completedSynchronously;
+
+        private readonly object m_asyncState;
+        private ManualResetEvent m_waitHandle;
+        private Exception m_exception;
+
+        internal SimpleAsyncResult(AsyncCallback cb, object state)
+        {
+            m_callback = cb;
+            m_asyncState = state;
+            m_completed = 0;
+            m_completedSynchronously = 1;
+        }
+
+
+        #region IAsyncResult Members
+
+        public object AsyncState
+        {
+            get { return m_asyncState; }
+        }
+
+
+
+        public WaitHandle AsyncWaitHandle
+        {
+            get
+            {
+                if (m_waitHandle == null)
+                {
+                    bool done = IsCompleted;
+                    ManualResetEvent mre = new ManualResetEvent(done);
+                    if (Interlocked.CompareExchange(ref m_waitHandle, mre, null) != null)
+                    {
+                        mre.Close();
+                    }
+                    else
+                    {
+                        if (!done && IsCompleted)
+                        {
+                            m_waitHandle.Set();
+                        }
+                    }
+                }
+                return m_waitHandle;
+            }
+        }
+
+
+        public bool CompletedSynchronously
+        {
+            get { return Thread.VolatileRead(ref m_completedSynchronously) == 1; }
+        }
+
+
+        public bool IsCompleted
+        {
+            get { return Thread.VolatileRead(ref m_completed) == 1; }
+        }
+
+
+        #endregion
+
+
+        #region class Methods
+        internal void SetAsCompleted(bool completedSynchronously)
+        {
+            m_completed = 1;
+            if(completedSynchronously)
+                m_completedSynchronously = 1;
+            else
+                m_completedSynchronously = 0;
+            
+            SignalCompletion();
+        }
+
+        internal void HandleException(Exception e, bool completedSynchronously)
+        {
+            m_completed = 1;
+            if (completedSynchronously)
+                m_completedSynchronously = 1;
+            else
+                m_completedSynchronously = 0;
+            m_exception = e;
+
+            SignalCompletion();
+        }
+
+        private void SignalCompletion()
+        {
+            if(m_waitHandle != null) m_waitHandle.Set();
+
+            if(m_callback != null) m_callback(this);
+        }
+
+        public void EndInvoke()
+        {
+            // This method assumes that only 1 thread calls EndInvoke 
+            if (!IsCompleted)
+            {
+                // If the operation isn't done, wait for it
+                AsyncWaitHandle.WaitOne();
+                AsyncWaitHandle.Close();
+                m_waitHandle = null;  // Allow early GC
+            }
+
+            // Operation is done: if an exception occured, throw it
+            if (m_exception != null) throw m_exception;
+        }       
+
+        #endregion 
+    }
+
+    internal class AsyncResult<T> : SimpleAsyncResult
+    {
+        private T m_result = default(T);
+
+        public AsyncResult(AsyncCallback asyncCallback, Object state) :
+            base(asyncCallback, state) { }
+
+
+        public void SetAsCompleted(T result,  bool completedSynchronously)
+        {
+            // Save the asynchronous operation's result
+            m_result = result;
+
+            // Tell the base class that the operation completed 
+            // sucessfully (no exception)
+            base.SetAsCompleted(completedSynchronously);
+        }
+
+        new public T EndInvoke()
+        {
+            base.EndInvoke(); 
+            return m_result;  
+        }
+
+    }
+}
-- 
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