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using Microsoft.Extensions.Logging;
namespace NEventStore.Example
{
internal static class MainProgram
{
private static readonly Guid StreamId = Guid.NewGuid(); // aggregate identifier
private static IStoreEvents? store;
private static void Main()
{
// Console.WindowWidth = Console.LargestWindowWidth - 20;
Console.WriteLine("------------------");
Console.WriteLine("Using Sync Methods");
Console.WriteLine("------------------");
Console.WriteLine();
using (store = WireupEventStore())
{
OpenOrCreateStream();
AppendToStream();
TakeSnapshot();
LoadFromSnapshotForwardAndAppend();
}
Console.WriteLine();
Console.WriteLine("-------------------");
Console.WriteLine("Using Async Methods");
Console.WriteLine("-------------------");
Console.WriteLine();
Task.Run(async () =>
{
using (store = WireupEventStore())
{
await OpenOrCreateStreamAsync();
await AppendToStreamAsync();
await TakeSnapshotAsync();
await LoadFromSnapshotForwardAndAppendAsync();
}
}).GetAwaiter().GetResult();
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
private static IStoreEvents WireupEventStore()
{
var loggerFactory = LoggerFactory.Create(logging =>
{
logging
.AddConsole()
.AddDebug()
.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
});
return Wireup.Init()
.WithLoggerFactory(loggerFactory)
.UseOptimisticPipelineHook()
.UsingInMemoryPersistence()
.InitializeStorageEngine()
#if NET462
.TrackPerformanceInstance("example")
#endif
.HookIntoPipelineUsing(new AuthorizationPipelineHook())
.Build();
}
#region Sync Methods
private static void OpenOrCreateStream()
{
// we can call CreateStream(StreamId) if we know there isn't going to be any data.
// or we can call OpenStream(StreamId, 0, int.MaxValue) to read all commits,
// if no commits exist then it creates a new stream for us.
using var stream = store!.OpenStream(StreamId, 0, int.MaxValue);
var @event = new SomeDomainEvent { Value = "Initial event." };
stream.Add(new EventMessage { Body = @event });
stream.CommitChanges(Guid.NewGuid());
}
private static void AppendToStream()
{
using var stream = store!.OpenStream(StreamId);
var @event = new SomeDomainEvent { Value = "Second event." };
stream.Add(new EventMessage { Body = @event });
stream.CommitChanges(Guid.NewGuid());
}
private static void TakeSnapshot()
{
var memento = new AggregateMemento { Value = "snapshot" };
store!.Advanced.AddSnapshot(new Snapshot(StreamId.ToString(), 2, memento));
}
private static void LoadFromSnapshotForwardAndAppend()
{
var latestSnapshot = store!.Advanced.GetSnapshot(StreamId, int.MaxValue)
?? throw new InvalidOperationException("No snapshot found.");
using var stream = store.OpenStream(latestSnapshot, int.MaxValue);
var @event = new SomeDomainEvent { Value = "Third event (first one after a snapshot)." };
stream.Add(new EventMessage { Body = @event });
stream.CommitChanges(Guid.NewGuid());
}
#endregion
#region Async Methods
private static async Task OpenOrCreateStreamAsync()
{
// we can call CreateStream(StreamId) if we know there isn't going to be any data.
// or we can call OpenStream(StreamId, 0, int.MaxValue) to read all commits,
// if no commits exist then it creates a new stream for us.
using var stream = await store!.OpenStreamAsync(StreamId, 0, int.MaxValue, cancellationToken: CancellationToken.None);
var @event = new SomeDomainEvent { Value = "Initial event." };
stream.Add(new EventMessage { Body = @event });
await stream.CommitChangesAsync(Guid.NewGuid(), CancellationToken.None);
}
private static async Task AppendToStreamAsync()
{
using var stream = await store!.OpenStreamAsync(StreamId, cancellationToken: CancellationToken.None);
var @event = new SomeDomainEvent { Value = "Second event." };
stream.Add(new EventMessage { Body = @event });
await stream.CommitChangesAsync(Guid.NewGuid(), CancellationToken.None);
}
private static Task<bool> TakeSnapshotAsync()
{
var memento = new AggregateMemento { Value = "snapshot" };
return store!.Advanced.AddSnapshotAsync(new Snapshot(StreamId.ToString(), 2, memento), CancellationToken.None);
}
private static async Task LoadFromSnapshotForwardAndAppendAsync()
{
var latestSnapshot = await store!.Advanced.GetSnapshotAsync(StreamId, int.MaxValue, CancellationToken.None)
?? throw new InvalidOperationException("No snapshot found.");
using var stream = await store.OpenStreamAsync(latestSnapshot, int.MaxValue, CancellationToken.None);
var @event = new SomeDomainEvent { Value = "Third event (first one after a snapshot)." };
stream.Add(new EventMessage { Body = @event });
await stream.CommitChangesAsync(Guid.NewGuid(), CancellationToken.None);
}
#endregion
}
}