/// <summary>
/// Migration Logic for ToDoList and ToDoItem.
/// NOTE: uses Snapshot and Memento implementation to create initial version of AggregateRoots
/// </summary>
/// <param name="command"></param>
public void ExecuteMigration()
{
#region ToDoList Migration
// For each list in legacy database, creates a new repository ID,
// mapping and snapshot with the data retrieved from readModel (legacy database)
foreach (var list in _db.ToDoLists)
{
if (_db.IdMaps.GetAggregateId <ToDoList>(list.Id).Equals(Guid.Empty))
{
using (var scope = new TransactionScope())
{
// Get fresh new ID
Guid entityId = Guid.NewGuid();
while (!_db.IdMaps.GetModelId <ToDoList>(entityId).Equals(0))
{
entityId = Guid.NewGuid();
}
// Save Ids mapping
_db.IdMaps.Map <ToDoList>(list.Id, entityId);
// Create Memento from ReadModel
var entity = new Todo.Domain.Model.ToDoListMemento(entityId, 1, list.Title, list.Description);
//At this point the entity migration is complete, but an event is needed in order
//to replay correctly all events (for brand new projections, upgrade read-model, etc)
//Create a fake External event: Memento Propagation Events
using (var stream = _store.OpenStream(entityId, 0, int.MaxValue))
{
//// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
//var headers = new Dictionary<string, object>();
//headers[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
// Memento Propagation Event
var propagationEvent = new ToDoListMementoPropagatedEvent(entity);
// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
stream.UncommittedHeaders[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
stream.Add(new EventMessage {
Body = propagationEvent
});
stream.CommitChanges(Guid.NewGuid());
}
// Save Snapshot from entity's Memento image
_store.Advanced.AddSnapshot(new Snapshot(entity.Id.ToString(), entity.Version, entity));
scope.Complete();
System.Diagnostics.Debug.WriteLine("Successfully migrated ToDoList id: {0}, Guid: {1}, Title:{2}", new object[] { list.Id, entityId.ToString(), list.Title });
}
}
}
#endregion
#region ToDoItem Migration
foreach (var item in _db.ToDoItems)
{
if (_db.IdMaps.GetAggregateId <ToDoItem>(item.Id).Equals(Guid.Empty))
{
using (var scope = new TransactionScope())
{
// Get fresh new ID
Guid entityId = Guid.NewGuid();
while (!_db.IdMaps.GetModelId <ToDoItem>(entityId).Equals(0))
{
entityId = Guid.NewGuid();
}
// Save Ids mapping
_db.IdMaps.Map <ToDoItem>(item.Id, entityId);
// Create Memento from ReadModel
Guid todoListId = _db.IdMaps.GetAggregateId <ToDoList>(item.ToDoListId);
var entity = new Todo.Domain.Model.ToDoItemMemento(entityId, 1, todoListId, item.Description, item.CreationDate, item.DueDate, item.Importance, item.ClosingDate, item.UserId);
// At this point the entity migration is complete, but an event is needed in order
// to replay correctly all events (for brand new projections, upgrade read-model, etc)
// Create a fake External event: Memento Propagation Events
using (var stream = _store.OpenStream(entityId, 0, int.MaxValue))
{
//// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
//var headers = new Dictionary<string, object>();
//headers[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
// Memento Propagation Event
var propagationEvent = new ToDoItemMementoPropagatedEvent(entity);
// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
stream.UncommittedHeaders[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
stream.Add(new EventMessage {
Body = propagationEvent
});
stream.CommitChanges(Guid.NewGuid());
}
// Save Snapshot from entity's Memento image
_store.Advanced.AddSnapshot(new Snapshot(entity.Id.ToString(), entity.Version, entity));
scope.Complete();
System.Diagnostics.Debug.WriteLine("Successfully migrated ToDoItem id: {0}, Guid: {1}, Description:{2}", new object[] { item.Id, entityId.ToString(), item.Description });
}
}
}
#endregion
}
/// <summary>
/// Migration Logic for ToDoList and ToDoItem.
/// NOTE: uses Snapshot and Memento implementation to create initial version of AggregateRoots
/// </summary>
/// <param name="command"></param>
public void ExecuteMigration()
{
#region ToDoList Migration
// For each list in legacy database, creates a new repository ID,
// mapping and snapshot with the data retrieved from readModel (legacy database)
foreach (var list in _db.ToDoLists)
{
if (_db.IdMaps.GetAggregateId<ToDoList>(list.Id).Equals(Guid.Empty))
{
using (var scope = new TransactionScope())
{
// Get fresh new ID
Guid entityId = Guid.NewGuid();
while (!_db.IdMaps.GetModelId<ToDoList>(entityId).Equals(0))
entityId = Guid.NewGuid();
// Save Ids mapping
_db.IdMaps.Map<ToDoList>(list.Id, entityId);
// Create Memento from ReadModel
var entity = new Todo.Domain.Model.ToDoListMemento(entityId, 1, list.Title, list.Description);
//At this point the entity migration is complete, but an event is needed in order
//to replay correctly all events (for brand new projections, upgrade read-model, etc)
//Create a fake External event: Memento Propagation Events
using (var stream = _store.OpenStream(entityId, 0, int.MaxValue))
{
//// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
//var headers = new Dictionary<string, object>();
//headers[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
// Memento Propagation Event
var propagationEvent = new ToDoListMementoPropagatedEvent(entity);
// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
stream.UncommittedHeaders[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
stream.Add(new EventMessage { Body = propagationEvent });
stream.CommitChanges(Guid.NewGuid());
}
// Save Snapshot from entity's Memento image
_store.Advanced.AddSnapshot(new Snapshot(entity.Id.ToString(), entity.Version, entity));
scope.Complete();
System.Diagnostics.Debug.WriteLine("Successfully migrated ToDoList id: {0}, Guid: {1}, Title:{2}", new object[] { list.Id, entityId.ToString(), list.Title });
}
}
}
#endregion
#region ToDoItem Migration
foreach (var item in _db.ToDoItems)
{
if (_db.IdMaps.GetAggregateId<ToDoItem>(item.Id).Equals(Guid.Empty))
{
using (var scope = new TransactionScope())
{
// Get fresh new ID
Guid entityId = Guid.NewGuid();
while (!_db.IdMaps.GetModelId<ToDoItem>(entityId).Equals(0))
entityId = Guid.NewGuid();
// Save Ids mapping
_db.IdMaps.Map<ToDoItem>(item.Id, entityId);
// Create Memento from ReadModel
Guid todoListId = _db.IdMaps.GetAggregateId<ToDoList>(item.ToDoListId);
var entity = new Todo.Domain.Model.ToDoItemMemento(entityId, 1, todoListId, item.Description, item.CreationDate, item.DueDate, item.Importance, item.ClosingDate, item.UserId);
// At this point the entity migration is complete, but an event is needed in order
// to replay correctly all events (for brand new projections, upgrade read-model, etc)
// Create a fake External event: Memento Propagation Events
using (var stream = _store.OpenStream(entityId, 0, int.MaxValue))
{
//// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
//var headers = new Dictionary<string, object>();
//headers[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
// Memento Propagation Event
var propagationEvent = new ToDoItemMementoPropagatedEvent(entity);
// Header of stream (like NEeventStore does). See: https://github.com/NEventStore/NEventStore/blob/master/src/NEventStore/CommonDomain/Persistence/EventStore/EventStoreRepository.cs#L197
stream.UncommittedHeaders[AggregateTypeHeader] = entity.GetType().FullName.Replace("Memento", "");
stream.Add(new EventMessage { Body = propagationEvent });
stream.CommitChanges(Guid.NewGuid());
}
// Save Snapshot from entity's Memento image
_store.Advanced.AddSnapshot(new Snapshot(entity.Id.ToString(), entity.Version, entity));
scope.Complete();
System.Diagnostics.Debug.WriteLine("Successfully migrated ToDoItem id: {0}, Guid: {1}, Description:{2}", new object[] { item.Id, entityId.ToString(), item.Description });
}
}
}
#endregion
}