public static async Task <ModelWrapper> PullModel()
{
if (!modelPool.TryDequeue(out var model))
{
ConnectionWrapper conn = null;
foreach (var item in connectionList)
{
if (item.Increment() <= 15)
{
conn = item;
break;
}
else
{
item.Decrement();
}
}
if (conn == null && Interlocked.Increment(ref connectionCount) <= rabbitHost.MaxPoolSize)
{
conn = new ConnectionWrapper()
{
Connection = _Factory.CreateConnection(rabbitHost.EndPoints)
};
conn.Connection.ConnectionShutdown += (obj, args) =>
{
conn.Connection = _Factory.CreateConnection(rabbitHost.EndPoints);
conn.Reset();
};
connectionList.Add(conn);
}
if (conn != null)
{
model = new ModelWrapper()
{
Connection = conn, Model = conn.Connection.CreateModel()
};
model.Model.ConfirmSelect();
}
else
{
Interlocked.Decrement(ref connectionCount);
}
}
if (model == null)
{
var taskSource = new TaskCompletionSource <ModelWrapper>();
modelTaskPool.Enqueue(taskSource);
var cancelSource = new CancellationTokenSource(3000);
cancelSource.Token.Register(() =>
{
taskSource.SetException(new Exception("get rabbitmq's model timeout"));
});
model = await taskSource.Task;
}
if (model.Model.IsClosed)
{
model.Connection.Decrement();
model = await PullModel();
}
return(model);
}