/// <summary>
/// Setup:
/// 1 - Upload config => [Head]->[Tail]
/// 2 - Initialize Thread_1 with previous config which never expires (6000 sec.)
/// 3 - Cut-off Tail and upload config => [Head]
/// 4 - Initialize Thread_2 with new config which never expires (6000 sec.)
/// </summary>
void SetupStaleViewAndNewView(out ReplicatedTableConfigurationServiceV2 configServiceOne, out ReplicatedTableConfigurationServiceV2 configServiceTwo)
{
// Verify current View has 2 replicas ?
View view = this.configurationWrapper.GetWriteView();
Assert.IsTrue(view.Chain.Count == 2, "expects 2 replicas only!");
int leaseDurationInSec = 6000;
/*
* 1 - Upload config [Head]->[Tail]
*/
configServiceOne = new ReplicatedTableConfigurationServiceV2(this.configurationInfos, this.connectionStringMap, useHttps);
UploadHeadTailView(view.Name, leaseDurationInSec, configServiceOne);
/*
* 2 - Cut-off the Tail, set a high LeaseDuration.
* The new config will be [Head]
*/
configServiceTwo = new ReplicatedTableConfigurationServiceV2(this.configurationInfos, this.connectionStringMap, useHttps);
CutOffTailInView(view.Name, leaseDurationInSec, configServiceTwo);
/*
* At this stage:
* - configServiceOne sees a stale View (LeaseDuration = 6000sec.)
* - configServiceTwo sees the latest View (LeaseDuration = 6000sec.)
*/
long staleViewId = configServiceOne.GetTableView(this.repTable.TableName).ViewId;
long latestViewId = configServiceTwo.GetTableView(this.repTable.TableName).ViewId;
Assert.AreNotEqual(staleViewId, latestViewId, "View should have changed !!!");
}
private void InsertHeadInView(string viewName, int leaseDuration, ReplicatedTableConfigurationServiceV2 configService)
{
// Download config using provided instance
ReplicatedTableConfiguration config;
ReplicatedTableQuorumReadResult readStatus = configurationService.RetrieveConfiguration(out config);
Assert.IsTrue(readStatus.Code == ReplicatedTableQuorumReadCode.Success);
// Add the Head
ReplicatedTableConfigurationStore viewConfg = config.GetView(viewName);
viewConfg.ReplicaChain[0].Status = ReplicaStatus.WriteOnly;
viewConfg.ViewId++;
config.LeaseDuration = leaseDuration;
// Upload config using provided instance
configService.UpdateConfiguration(config);
}
private void EnableTailInView(string viewName, int leaseDuration, ReplicatedTableConfigurationServiceV2 configService)
{
// Download config using provided instance
ReplicatedTableConfiguration config;
ReplicatedTableQuorumReadResult readStatus = configurationService.RetrieveConfiguration(out config);
Assert.IsTrue(readStatus.Code == ReplicatedTableQuorumReadCode.Success);
// Enable the Tail
ReplicatedTableConfigurationStore viewConfg = config.GetView(viewName);
Assert.IsTrue(viewConfg.ReplicaChain.Count == 2);
Assert.IsTrue(viewConfg.ReadViewTailIndex == 0);
viewConfg.ReplicaChain[1].Status = ReplicaStatus.ReadWrite;
viewConfg.ViewId++;
config.LeaseDuration = leaseDuration;
// Upload config using provided instance
configService.UpdateConfiguration(config);
}
private void UploadHeadTailView(string viewName, int leaseDuration, ReplicatedTableConfigurationServiceV2 configService)
{
// Download config using provided instance
ReplicatedTableConfiguration config;
ReplicatedTableQuorumReadResult readStatus = configService.RetrieveConfiguration(out config);
Assert.IsTrue(readStatus.Code == ReplicatedTableQuorumReadCode.Success);
// [Head] -> [Tail]
ReplicatedTableConfigurationStore viewConfg = config.GetView(viewName);
Assert.IsTrue(viewConfg.GetCurrentReplicaChain().Count == 2);
// Force Reads on Head replica
viewConfg.ReadViewTailIndex = 0;
viewConfg.ViewId++;
config.LeaseDuration = leaseDuration;
// Upload config using provided instance
configService.UpdateConfiguration(config);
}
