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fix(community/performance): correct httpclient and oncompanyopen good samples

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httpclient-inside-write-transaction-holds-locks.good.al
- Pass Customer.RecordId as the last argument to CreateTask so the task
  is bound to the single customer that was written, not to all customers.
- Declare TableNo = Customer on the task codeunit so the platform loads
  the bound record into Rec automatically when OnRun executes.
- Replace the FindSet loop over all customers with Rec."No.", preserving
  the one-customer scope of the original SyncCustomerLastName procedure.

oncompanyopen-subscribers-must-not-do-io.good.al
- Replace Session.GetCurrentClientType() with Session.CurrentClientType(),
  the correct platform method name.
- Fix the idempotency check: TaskScheduler.TaskExists() requires a Guid,
  not a codeunit integer ID. Store the Guid returned by CreateTask in
  IsolatedStorage (DataScope::Company) under a fixed key; on the next
  login read it back as Text, Evaluate it to Guid, and pass that Guid to
  TaskExists so the type matches the method signature.
This commit is contained in:
Stefano Demiliani 2026-08-21 14:42:47 +02:00
parent 5f9328618d
commit 8373bc4717
2 changed files with 17 additions and 13 deletions
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13
community/knowledge/performance/httpclient-inside-write-transaction-holds-locks.good.al
View file

@ -5,22 +5,21 @@ codeunit 50100 "HttpClient Holds Locks Good"
begin
Customer."Search Name" := Customer.Name;
Customer.Modify(false);
TaskScheduler.CreateTask(Codeunit::"Customer Sync Task", 0, true, CompanyName(), CurrentDateTime());
// RecordId binds the task to this specific customer; the platform loads it into Rec on OnRun.
TaskScheduler.CreateTask(Codeunit::"Customer Sync Task", 0, true, CompanyName(), CurrentDateTime(), Customer.RecordId);
end;
}
codeunit 50101 "Customer Sync Task"
{
TableNo = Customer;
trigger OnRun()
var
Client: HttpClient;
Customer: Record Customer;
Response: HttpResponseMessage;
begin
// Separate session: no write-transaction lock is held during the HTTP call.
if Customer.FindSet() then
repeat
Client.Get(StrSubstNo('https://example.local/sync/%1', Customer."No."), Response);
until Customer.Next() = 0;
// Separate session: Rec is the single customer passed via RecordId; no write-transaction lock is held.
Client.Get(StrSubstNo('https://example.local/sync/%1', Rec."No."), Response);
end;
}

17
community/knowledge/performance/oncompanyopen-subscribers-must-not-do-io.good.al
View file

@ -2,17 +2,22 @@ codeunit 50100 "Login Subscriber IO Good"
{
[EventSubscriber(ObjectType::Codeunit, Codeunit::"System Initialization", OnAfterLogin, '', false, false)]
local procedure OnAfterLogin()
var
TaskId: Guid;
StoredId: Text;
begin
// Guard to interactive sessions only; background task sessions also raise OnAfterLogin.
if not (Session.GetCurrentClientType() in [ClientType::Web, ClientType::Windows, ClientType::Desktop, ClientType::Tablet, ClientType::Phone]) then
if not (Session.CurrentClientType() in [ClientType::Web, ClientType::Windows, ClientType::Desktop, ClientType::Tablet, ClientType::Phone]) then
exit;
// Idempotent: skip if a task for this codeunit is already queued.
if TaskScheduler.TaskExists(Codeunit::"Login Subscriber IO Work") then
exit;
// Idempotent: TaskExists requires the GUID returned by CreateTask, stored across logins.
if IsolatedStorage.Get('LoginSyncTaskId', DataScope::Company, StoredId) then
if Evaluate(TaskId, StoredId) then
if TaskScheduler.TaskExists(TaskId) then
exit;
// Defer the I/O work; CreateTask is the only write allowed on this path.
TaskScheduler.CreateTask(Codeunit::"Login Subscriber IO Work", 0, true, CompanyName(), CurrentDateTime() + 60000);
TaskId := TaskScheduler.CreateTask(Codeunit::"Login Subscriber IO Work", 0, true, CompanyName(), CurrentDateTime() + 60000);
IsolatedStorage.Set('LoginSyncTaskId', Format(TaskId), DataScope::Company);
end;
}