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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 OpenSimulator 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;
- using System.Threading;
- namespace OpenSim.Framework.Communications
- {
- 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 synchronously?
- /// </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.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);
- }
- public new T EndInvoke()
- {
- base.EndInvoke();
- return m_result;
- }
- }
- }
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