| /* |
| * |
| * 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); |
| } |
| } |
| } |
| } |