/// <summary>
/// Startup the resource pool
/// </summary>
public async Task <bool> StartupAsync(Func <Task <T> > createConnectionHandler, Func <T, Task> closeConnectionHandler)
{
await ShutdownAsync();
IsRunning = true;
this.createResourceHandler = createConnectionHandler;
this.closeResourceHandler = closeConnectionHandler;
requestQueue = new List <Request>();
resourcePool = new List <ResourcePoolEntry>();
//Initialize the worker which will increase/decrease the pool size as necessary
resourcePoolMonitor = new AutoResetWorker()
{
PeriodicSignallingTime = TimeSpan.FromSeconds(1) //May need to re-evaluate this interval
};
if (!await resourcePoolMonitor.StartupAsync(connectionPoolMonitor_DoWork, null, () => IsRunning))
{
await ShutdownAsync();
return(false);
}
resourcePoolInitializing = true;
resourcePoolMonitor.Set();
return(true);
}
/// <summary>
/// Shutdown resource pool
/// </summary>
public async Task ShutdownAsync(int maxWait = -1)
{
IsRunning = false;
if (resourcePoolMonitor != null)
{
await resourcePoolMonitor.ShutdownAsync();
resourcePoolMonitor = null;
}
//Close any lingering pool connections
DateTime timeoutTime = maxWait >= 0 ? DateTime.MaxValue : DateTime.Now.AddMilliseconds(maxWait);
while (resourcePool.Count > 0)
{
var shutdownTasks = new List <Task>();
bool timeoutExpired = DateTime.Now < timeoutTime;
int index = 0;
while (index < resourcePool.Count)
{
var resource = resourcePool[index];
if (resource.InUse && !timeoutExpired)
{
//Give in-use resources time to finish their work before we close their connection
index++;
}
else
{
resourcePool.RemoveAt(index);
shutdownTasks.Add(closeResourceHandler(resource.Connection));
}
}
if (shutdownTasks.Count > 0)
{
await Task.WhenAll(shutdownTasks.ToArray());
}
else
{
await Task.Delay(10);
}
}
createResourceHandler = null;
closeResourceHandler = null;
requestQueue = null;
resourcePool = null;
}