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Pessimistic Locking for Transaction
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| <?php | |
| function transfer($fromAccountId, $toAccountId, $amount) | |
| { | |
| DB::beginTransaction(); | |
| try { | |
| $fromQuery = Account::whereId($fromAccountId); | |
| if (! $fromQuery->exists()) { | |
| throw new InvalidAccountException(); | |
| } | |
| $toQuery = Account::whereId($toAccountId); | |
| if (! $toQuery->exists()) { | |
| throw new InvalidAccountException(); | |
| } | |
| $fromAccount = $fromQuery->lockForUpdate()->first(); | |
| if ($amount > $fromAccount->balance) { | |
| throw new InsufficientBalanceException(); | |
| } | |
| $toAccount = $toQuery->lockForUpdate()->first(); | |
| $toAccount->balance += $amount; | |
| $toAccount->save(); | |
| $fromAccount->balance -= $amount; | |
| $fromAccount->save(); | |
| $transaction = new Transaction(); | |
| $transaction->from_account_id = $fromAccountId; | |
| $transaction->to_account_id = $toAccountId; | |
| $transaction->amount = $amount; | |
| $transaction->save(); | |
| DB::commit(); | |
| } catch (\Exception $e) { | |
| DB::rollBack(); | |
| throw $e; | |
| } | |
| } |
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