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");
blob.SetMetadata(AccessCondition.GenerateLeaseCondition(arl.leaseId));
}
}
}
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);
}
}
public void Run()
{
_isRecycling = false;
TenantStatus = TenantStatus.Starting;
Trace.TraceInformation("tenant {0} starting", TenantNumber);
var container = _blobClient.GetContainerReference("locks");
var blob = container.GetBlockBlobReference("tenant" + TenantNumber);
var amITheLeader = AzureLeaderElectionProvider.AmITheLeader;
var tenantStatus = GetTenantStatus();
if (amITheLeader == false && tenantStatus != TenantStatus.Started)
{
Trace.TraceInformation("Tenant {0} not started on the leader \t\t Recycling tenant", TenantNumber);
return; //recycle tenant
}
using (var arl = new AutoRenewLease(blob))
{
if (arl.HasLease)
{
Trace.TraceInformation("tenant {0} setup...", TenantNumber);
Thread.Sleep(10000);
Trace.TraceInformation("tenant {0} setup done", TenantNumber);
}
else
{
Trace.TraceInformation("Lock exception on tenant {0} \t Recycle tenant", TenantNumber);
return; // recycle tenant
}
} // lease is released here
Trace.TraceInformation("tenant {0} started", TenantNumber);
TenantStatus = TenantStatus.Started;
while (true)
{
GenerateEvent();
Tick();
if (_isRecycling)
{
return;
}
}
}
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";
blob.SetMetadata(AccessCondition.GenerateLeaseCondition(arl.leaseId));
}
else
{
Thread.Sleep(pollingFrequency);
}
}
}
}
