protected virtual void MigrateAspectServices(DataDbContextAccessor <TAudit, TAuditProperty, TMigration, TTabulation, TTenant, TGenId, TIncremId, TCreatedBy> dbContextAccessor,
Action migrateStructureAction)
{
IServicesManager <IMigrateAccessorAspect> aspects = null;
// 数据迁移支持写入连接（包括未启用读写分离的默认连接）// 或启用数据同步的默认与写入连接（数据同步改为在 AccessorBatchExecutor 底层实现）
if (dbContextAccessor.IsWritingConnectionString()) // || dbContextAccessor.CurrentTenant.DataSynchronization
{
aspects = dbContextAccessor.GetService <IServicesManager <IMigrateAccessorAspect> >();
aspects.ForEach(aspect =>
{
if (aspect.Enabled)
{
aspect.PreProcess(dbContextAccessor); // 前置处理数据迁移
}
});
}
// 结构迁移支持写入连接（包括未启用读写分离的默认连接）或启用结构同步的默认与写入连接
if (dbContextAccessor.IsWritingConnectionString() || dbContextAccessor.CurrentTenant.StructureSynchronization)
{
migrateStructureAction.Invoke();
}
if (aspects.IsNotNull())
{
aspects.ForEach(aspect =>
{
if (aspect.Enabled)
{
aspect.PostProcess(dbContextAccessor); // 后置处理数据迁移
}
});
}
}
protected virtual void AddMigration
(DataDbContextAccessor <TAudit, TAuditProperty, TMigration, TTabulation, TTenant, TGenId, TIncremId, TCreatedBy> dbContextAccessor)
{
if (!dbContextAccessor.IsWritingConnectionString())
{
return;
}
(var body, var hash) = CreateModelSnapshot(dbContextAccessor, out var typeName);
dbContextAccessor.MigrationsManager.TryAdd(p => p.ModelHash == hash,
() =>
{
var identifierGenerator = (IDataStoreIdentificationGenerator <TGenId>)dbContextAccessor
.GetService <IStoreIdentificationGenerator>();
var migration = ObjectExtensions.EnsureCreate <TMigration>();
migration.Id = identifierGenerator.GenerateMigrationId();
migration.PopulateCreation(identifierGenerator.Clock);
migration.AccessorName = dbContextAccessor.CurrentType.GetDisplayNameWithNamespace();
migration.ModelSnapshotName = typeName;
migration.ModelBody = body;
migration.ModelHash = hash;
return(migration);
},
addedPost =>
{
if (!dbContextAccessor.RequiredSaveChanges)
{
dbContextAccessor.RequiredSaveChanges = true;
}
// 移除当前缓存
var cacheKey = DbContextAccessorHelper.GetMigrationCacheKey(dbContextAccessor);
MemoryCache.Remove(cacheKey);
// 发送迁移通知
var mediator = dbContextAccessor.GetService <IMediator>();
mediator.Publish(new MigrationNotification <TMigration>
{
Migration = addedPost.Entity
})
.ConfigureAwaitCompleted();
});
}
