63 lines
2.1 KiB
C#
63 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Threading.Tasks;
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using FinancialApi.Domain;
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using Wolverine.Persistence;
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namespace FinancialApi.Application;
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public interface IAccountQuery
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{
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Task<Account?> FindByIdAsync(int id);
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}
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public record TransferFundsCommand(int SourceAccountId, int DestinationAccountId, decimal Amount);
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public record FundsTransferredEvent(int SourceAccountId, int DestinationAccountId, decimal Amount);
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public record TransferPair(Account Source, Account Destination, DateTimeOffset TimeStamp);
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public static class TransferFundsHandler
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{
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public static async Task<TransferPair?> LoadAsync(TransferFundsCommand cmd, IAccountQuery query,
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TimeProvider timeProvider)
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{
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var source = await query.FindByIdAsync(cmd.SourceAccountId);
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var dest = await query.FindByIdAsync(cmd.DestinationAccountId);
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if (source == null || dest == null) return null;
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return new TransferPair(source, dest, timeProvider.GetUtcNow());
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}
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public static (
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IStorageAction<Account> SourceWrite,
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IStorageAction<Account> DestWrite,
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IStorageAction<JournalEntry> JournalWrite,
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FundsTransferredEvent Event
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) Handle(TransferFundsCommand cmd, TransferPair pair)
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{
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var updatedSource = pair.Source.Debit(cmd.Amount);
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var updatedDest = pair.Destination.Credit(cmd.Amount);
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var lines = new List<JournalLine>
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{
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new(pair.Source.Id, cmd.Amount, EntryType.Debit),
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new(pair.Destination.Id, cmd.Amount, EntryType.Credit)
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};
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var journalEntry =
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BalancedJournal.Create(Guid.NewGuid(),
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$"Transfer: {cmd.Amount} from {cmd.SourceAccountId} to {cmd.DestinationAccountId}",
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pair.TimeStamp, lines);
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var @event = new FundsTransferredEvent(cmd.SourceAccountId, cmd.DestinationAccountId, cmd.Amount);
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return (
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Storage.Update(updatedSource),
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Storage.Update(updatedDest),
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Storage.Insert(journalEntry.Entry),
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@event
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);
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}
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} |