1 files changed, 121 insertions, 0 deletions
diff --git a/qpid/dotnet/Qpid.Client/Client/State/StateWaiter.cs b/qpid/dotnet/Qpid.Client/Client/State/StateWaiter.cs
new file mode 100644
index 0000000000..e739d0cb44
--- /dev/null
+++ b/qpid/dotnet/Qpid.Client/Client/State/StateWaiter.cs
@@ -0,0 +1,121 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.Threading;
+using Apache.Qpid.Client.Protocol;
+using log4net;
+
+namespace Apache.Qpid.Client.State
+{
+    public class StateWaiter : IStateListener
+    {
+        private static readonly ILog _logger = LogManager.GetLogger(typeof(StateWaiter));
+
+        private readonly AMQState _state;
+        private AMQState _newState;
+
+        private volatile bool _newStateAchieved;
+
+        private volatile Exception _exception;
+
+        private ManualResetEvent _resetEvent = new ManualResetEvent(false);
+        
+        public StateWaiter(AMQState state)
+        {
+            _state = state;
+        }
+
+        public void StateChanged(AMQState oldState, AMQState newState)
+        {
+            _newState = newState;
+            if (_logger.IsDebugEnabled)
+            {
+                _logger.Debug("stateChanged called");
+            }
+            if (_state == newState)
+            {
+                _newStateAchieved = true;
+
+                if (_logger.IsDebugEnabled)
+                {
+                    _logger.Debug("New state reached so notifying monitor");
+                }
+                _resetEvent.Set();
+            }            
+        }
+
+        public void Error(Exception e)
+        {            
+            if (_logger.IsDebugEnabled)
+            {
+                _logger.Debug("exceptionThrown called");
+            }
+
+            _exception = e;
+            _resetEvent.Set();
+        }
+        
+        public void WaituntilStateHasChanged()
+        {            
+            //
+            // The guard is required in case we are woken up by a spurious
+            // notify().
+            //
+
+            TimeSpan waitTime = TimeSpan.FromMilliseconds(DefaultTimeouts.MaxWaitForState);
+            DateTime waitUntilTime = DateTime.Now + waitTime;
+
+            while ( !_newStateAchieved 
+               && _exception == null 
+               && waitTime.TotalMilliseconds > 0 )
+            {
+                _logger.Debug("State not achieved so waiting...");
+                try
+                {
+                    _resetEvent.WaitOne(waitTime, true);
+                }
+                finally
+                {
+                    if (!_newStateAchieved)
+                    {
+                        waitTime = waitUntilTime - DateTime.Now;
+                    }
+                }
+            }
+
+            if (_exception != null)
+            {
+                _logger.Debug("Throwable reached state waiter: " + _exception);
+                if (_exception is AMQException)
+                    throw _exception;
+                else
+                    throw new AMQException("Error: "  + _exception, _exception);
+            }
+
+            if (!_newStateAchieved)
+            {
+                string error = string.Format("State not achieved within permitted time. Current state: {0}, desired state: {1}", _state, _newState);
+                _logger.Warn(error);
+                throw new AMQException(error);
+            }
+        }
+    }
+}