void Book(MakeTransfer transfer)
=> accounts.Get(transfer.DebitedAccountId)
.Bind(account => account.Debit(transfer.Amount))
.ForEach(newState =>
{
accounts.Save(transfer.DebitedAccountId, newState);
swift.Wire(transfer, newState);
});
private void doit(Rq rq)
{
repo
.Get(rq.id)
.Bind(account => account.Debit(rq.transferAmount))
.ForEach(account =>
{
// There are 2 statements here ...
// They have side-effects and its both-together ...
// create single Task representing both ops,
// and have process that performs both
// remove the task ONLY when both carried out
// both ops may get performed more than once ...
// => make provisions so that both tasks are idempotent
repo.Save(rq.id, account);
swift.Wire(rq, account);
});
}