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Lidarr/Migrator.net/Migrator/MigrateAnywhere.cs

100 lines
3.0 KiB

using System;
using System.Collections.Generic;
using Migrator.Framework;
namespace Migrator
{
/// <summary>
/// Description of MigrateAnywhere.
/// </summary>
public class MigrateAnywhere : BaseMigrate
{
private bool _goForward;
public MigrateAnywhere(List<long> availableMigrations, ITransformationProvider provider, ILogger logger)
: base(availableMigrations, provider, logger)
{
_current = 0;
if (provider.AppliedMigrations.Count > 0) {
_current = provider.AppliedMigrations[provider.AppliedMigrations.Count - 1];
}
_goForward = false;
}
public override long Next
{
get
{
return _goForward
? NextMigration()
: PreviousMigration();
}
}
public override long Previous
{
get
{
return _goForward
? PreviousMigration()
: NextMigration();
}
}
public override bool Continue(long version)
{
// If we're going backwards and our current is less than the target,
// reverse direction. Also, start over at zero to make sure we catch
// any merged migrations that are less than the current target.
if (!_goForward && version >= Current)
{
_goForward = true;
Current = 0;
Iterate();
}
// We always finish on going forward. So continue if we're still
// going backwards, or if there are no migrations left in the forward direction.
return !_goForward || Current <= version;
}
public override void Migrate(IMigration migration)
{
_provider.BeginTransaction();
MigrationAttribute attr = (MigrationAttribute)Attribute.GetCustomAttribute(migration.GetType(), typeof(MigrationAttribute));
if (_provider.AppliedMigrations.Contains(attr.Version)) {
RemoveMigration(migration, attr);
} else {
ApplyMigration(migration, attr);
}
}
private void ApplyMigration(IMigration migration, MigrationAttribute attr)
{
// we're adding this one
_logger.MigrateUp(Current, migration.Name);
if(! DryRun)
{
migration.Up();
_provider.MigrationApplied(attr.Version);
_provider.Commit();
migration.AfterUp();
}
}
private void RemoveMigration(IMigration migration, MigrationAttribute attr)
{
// we're removing this one
_logger.MigrateDown(Current, migration.Name);
if (! DryRun)
{
migration.Down();
_provider.MigrationUnApplied(attr.Version);
_provider.Commit();
migration.AfterDown();
}
}
}
}