public void GetMigrationsTo(long timestamp, Predicate <string> moduleSelector,
out IEnumerable <ApplicableMigration> applicableMigrations, out IEnumerable <IMigrationMetadata> unidentifiedMigrations)
{
var moduleMigrations = from m in _importedMigrations where moduleSelector(m.Metadata.ModuleName) select m;
var comparer = new MigrationMetadataComparer();
var applicableUpMigrations = new List <ApplicableMigration>(
from m in moduleMigrations
where m.Metadata.Timestamp <= timestamp &&
!_executedMigrations.Any(x => comparer.Equals(x, m.Metadata))
orderby m.Metadata.Timestamp ascending
select new ApplicableMigration(m.Implementation, new ScheduledMigrationMetadata(m.Metadata.Timestamp, m.Metadata.ModuleName, m.Metadata.Tag, MigrationDirection.Up)));
var applicableDownMigrations = new List <ApplicableMigration>(
from m in moduleMigrations
where m.Metadata.Timestamp > timestamp &&
_executedMigrations.Any(x => comparer.Equals(x, m.Metadata))
orderby m.Metadata.Timestamp descending
select new ApplicableMigration(m.Implementation, new ScheduledMigrationMetadata(m.Metadata.Timestamp, m.Metadata.ModuleName, m.Metadata.Tag, MigrationDirection.Down)));
if (applicableDownMigrations.Any(m => !(m.Implementation is IReversibleMigration)))
{
throw new IrreversibleMigrationException();
}
int countUp = applicableUpMigrations.Count();
int countDown = applicableDownMigrations.Count();
Log.Info("Found {0} (up: {1}, down: {2}) applicable migration(s)", countUp + countDown, countUp, countDown);
applicableMigrations = applicableDownMigrations.Concat(applicableUpMigrations); // order matters!
unidentifiedMigrations = new List <IMigrationMetadata>(
from m in _executedMigrations
where !_importedMigrations.Any(a => a.Metadata.ModuleName == m.ModuleName &&
a.Metadata.Timestamp == m.Timestamp)
orderby m.Timestamp
select m);
if (unidentifiedMigrations.Count() > 0)
{
Log.Warning("Found {0} migration(s) that were executed in the database but are not contained in the application.", unidentifiedMigrations.Count());
}
}
private bool IsApplicable(IMigrationMetadata migration)
{
var comparer = new MigrationMetadataComparer();
return(_applicableMigrations.Select(m => m.Migration.Metadata).Contains(migration, comparer));
}
