public static void DoEvery(CloudBlockBlob blob, TimeSpan interval, Action action)
{
while (true)
{
var lastPerformed = DateTimeOffset.MinValue;
using (var arl = new AutoRenewLease(blob))
{
if (arl.HasLease)
{
blob.FetchAttributes();
DateTimeOffset.TryParseExact(blob.Metadata["lastPerformed"], "R", CultureInfo.CurrentCulture, DateTimeStyles.AdjustToUniversal, out lastPerformed);
if (DateTimeOffset.UtcNow >= lastPerformed + interval)
{
action();
lastPerformed = DateTimeOffset.UtcNow;
blob.Metadata["lastPerformed"] = lastPerformed.ToString("R");
AccessCondition ac = new AccessCondition();
ac.LeaseId = arl.leaseId;
blob.SetMetadata(ac);
}
}
}
var timeLeft = (lastPerformed + interval) - DateTimeOffset.UtcNow;
var minimum = TimeSpan.FromSeconds(5); // so we're not polling the leased blob too fast
Thread.Sleep(
timeLeft > minimum
? timeLeft
: minimum);
}
}
/// <summary>
/// Выполнить последовательно
/// </summary>
/// <param name="lockBlobName">имя блоба - просто буквы</param>
/// <param name="action"></param>
/// <param name="cnStrName">из конфига</param>
/// <param name="containerName">из конфига</param>
/// <param name="pollingFrequency"></param>
public static void DoConsequence(string lockBlobName, Action action,
string cnStrName = "StorageConnectionString",
string containerName = "leasesContainer", TimeSpan?pollingFrequency = null)
{
//http://www.windowsazure.com/en-us/develop/net/how-to-guides/blob-storage/
// Формат пути к блобу
//http://<storage account>.blob.core.windows.net/<container>/<blob>
// Блобовский аккаунт
var account = CloudStorageAccount.Parse(ConfigurationManager.ConnectionStrings[cnStrName].ConnectionString); //CloudStorageAccount.Parse("UseDevelopmentStorage=true"); // Не работает на SDK 2.2 // or your real connection string
var blobs = account.CreateCloudBlobClient();
// Контейнер - типа папки
var container = blobs
.GetContainerReference(ConfigurationManager.AppSettings[containerName]);
container.CreateIfNotExists();
var blob = container.GetBlockBlobReference(lockBlobName);
bool jobDone = false;
while (!jobDone)
{
using (var arl = new AutoRenewLease(blob))
{
if (arl.HasLease)
{
// Some Sync Work here
action();
jobDone = true;
}
else
{
Thread.Sleep(pollingFrequency ?? TimeSpan.FromMilliseconds(300));
}
}
}
}
public static void DoOnce(CloudBlockBlob blob, Action action, TimeSpan pollingFrequency)
{
// blob.Exists has the side effect of calling blob.FetchAttributes, which populates the metadata collection
while (!blob.Exists() || blob.Metadata["progress"] != "done")
{
using (var arl = new AutoRenewLease(blob))
{
if (arl.HasLease)
{
action();
blob.Metadata["progress"] = "done";
AccessCondition ac = new AccessCondition();
ac.LeaseId = arl.leaseId;
blob.SetMetadata(ac);
}
else
{
Thread.Sleep(pollingFrequency);
}
}
}
}
