public async Task <string> AcquireNextAccountForPullingReportAsync(string processor)
{
// Get all accounts with no processor
var idleAccounts = await ReportLeaseTableEntity.ListAsync(reportLeaseTable, null);
if (idleAccounts == null || idleAccounts.Count <= 0)
{
return(null);
}
// Try to acquire one and only one account
var now = DateTime.UtcNow;
foreach (var account in idleAccounts)
{
// We will ensure that the account will be processed only once every ReportPullingIntervalByMinutes - 5 (55) minutes
// If no other processor, the same processor must to process the account in next round
if (account.LastProcessTime != null && account.LastProcessTime.Value.AddMinutes(Constants.ReportPullingIntervalByMinutes - 5) >= now)
{
continue;
}
if (await ReportLeaseTableEntity.TryAcquireLeaseAsync(reportLeaseTable, account.EngagementAccount, processor))
{
return(account.EngagementAccount);
}
}
return(null);
}
public async Task OnAccountCreatedOrUpdatedAsync(string engagementAccount)
{
// Create history table if not exist
await GetHistoryTableAsync(engagementAccount, true);
// Init record in report lease table
await ReportLeaseTableEntity.InitAccountAsync(reportLeaseTable, engagementAccount);
}
public static async Task DeleteAccountAsync(CloudTable table, string engagementAccount)
{
var entity = new ReportLeaseTableEntity(engagementAccount)
{
ETag = "*"
};
var operation = TableOperation.Delete(entity);
await table.ExecuteAsync(operation);
}
public async Task OnAccountDeletedAsync(string engagementAccount)
{
// Delete history table
var historyTable = await GetHistoryTableAsync(engagementAccount);
await historyTable.DeleteIfExistsAsync();
// Delete record in report lease table
await ReportLeaseTableEntity.DeleteAccountAsync(reportLeaseTable, engagementAccount);
}
public static async Task InitAccountAsync(CloudTable table, string engagementAccount)
{
var entity = new ReportLeaseTableEntity(engagementAccount);
var operation = TableOperation.InsertOrMerge(entity);
await table.ExecuteAsync(operation);
}
public async Task ReleaseAccountForPullingReportAsync(string processor, string engagementAccount)
{
await ReportLeaseTableEntity.TryReleaseLeaseAsync(reportLeaseTable, engagementAccount, processor);
}