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// **********************************************************************
//
// Copyright (c) 2003-2017 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
namespace IceInternal
{
using System.Collections.Generic;
using System.Diagnostics;
public class RetryTask : TimerTask, CancellationHandler
{
public RetryTask(Instance instance, RetryQueue retryQueue, ProxyOutgoingAsyncBase outAsync)
{
_instance = instance;
_retryQueue = retryQueue;
_outAsync = outAsync;
}
public void runTimerTask()
{
_outAsync.retry();
//
// NOTE: this must be called last, destroy() blocks until all task
// are removed to prevent the client thread pool to be destroyed
// (we still need the client thread pool at this point to call
// exception callbacks with CommunicatorDestroyedException).
//
_retryQueue.remove(this);
}
public void asyncRequestCanceled(OutgoingAsyncBase outAsync, Ice.LocalException ex)
{
Debug.Assert(_outAsync == outAsync);
if(_retryQueue.cancel(this))
{
if(_instance.traceLevels().retry >= 1)
{
_instance.initializationData().logger.trace(_instance.traceLevels().retryCat,
string.Format("operation retry canceled\n{0}", ex));
}
if(_outAsync.exception(ex))
{
_outAsync.invokeExceptionAsync();
}
}
}
public void destroy()
{
try
{
_outAsync.abort(new Ice.CommunicatorDestroyedException());
}
catch(Ice.CommunicatorDestroyedException)
{
// Abort can throw if there's no callback, just ignore in this case
}
}
private Instance _instance;
private RetryQueue _retryQueue;
private ProxyOutgoingAsyncBase _outAsync;
}
public class RetryQueue
{
public RetryQueue(Instance instance)
{
_instance = instance;
}
public void add(ProxyOutgoingAsyncBase outAsync, int interval)
{
lock(this)
{
if(_instance == null)
{
throw new Ice.CommunicatorDestroyedException();
}
RetryTask task = new RetryTask(_instance, this, outAsync);
outAsync.cancelable(task); // This will throw if the request is canceled.
_instance.timer().schedule(task, interval);
_requests.Add(task, null);
}
}
public void destroy()
{
lock(this)
{
Dictionary<RetryTask, object> keep = new Dictionary<RetryTask, object>();
foreach(RetryTask task in _requests.Keys)
{
if(_instance.timer().cancel(task))
{
task.destroy();
}
else
{
keep.Add(task, null);
}
}
_requests = keep;
_instance = null;
while(_requests.Count > 0)
{
System.Threading.Monitor.Wait(this);
}
}
}
public void remove(RetryTask task)
{
lock(this)
{
if(_requests.Remove(task))
{
if(_instance == null && _requests.Count == 0)
{
// If we are destroying the queue, destroy is probably waiting on the queue to be empty.
System.Threading.Monitor.Pulse(this);
}
}
}
}
public bool cancel(RetryTask task)
{
lock(this)
{
if(_requests.Remove(task))
{
if(_instance == null && _requests.Count == 0)
{
// If we are destroying the queue, destroy is probably waiting on the queue to be empty.
System.Threading.Monitor.Pulse(this);
}
return _instance.timer().cancel(task);
}
return false;
}
}
private Instance _instance;
private Dictionary<RetryTask, object> _requests = new Dictionary<RetryTask, object>();
}
}
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