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/*
*
* 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);
}
}
}
}
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