private void MigrateStore(DatabaseLayout dbDirectoryLayout, DatabaseLayout migrationLayout, File migrationStateFile)
{
// One or more participants would like to do migration
_progressMonitor.started(_participants.Count);
MigrationStatus migrationStatus = MigrationStatus.readMigrationStatus(_fileSystem, migrationStateFile);
string versionToMigrateFrom = null;
// We don't need to migrate if we're at the phase where we have migrated successfully
// and it's just a matter of moving over the files to the storeDir.
if (MigrationStatus.Migrating.isNeededFor(migrationStatus))
{
versionToMigrateFrom = _upgradableDatabase.checkUpgradable(dbDirectoryLayout).storeVersion();
CleanMigrationDirectory(migrationLayout.DatabaseDirectory());
MigrationStatus.Migrating.setMigrationStatus(_fileSystem, migrationStateFile, versionToMigrateFrom);
MigrateToIsolatedDirectory(dbDirectoryLayout, migrationLayout, versionToMigrateFrom);
MigrationStatus.Moving.setMigrationStatus(_fileSystem, migrationStateFile, versionToMigrateFrom);
}
if (MigrationStatus.Moving.isNeededFor(migrationStatus))
{
versionToMigrateFrom = MigrationStatus.Moving.maybeReadInfo(_fileSystem, migrationStateFile, versionToMigrateFrom);
MoveMigratedFilesToStoreDirectory(_participants, migrationLayout, dbDirectoryLayout, versionToMigrateFrom, _upgradableDatabase.currentVersion());
}
Cleanup(_participants, migrationLayout);
_progressMonitor.completed();
}
public static MigrationStatus ReadMigrationStatus(Org.Neo4j.Io.fs.FileSystemAbstraction fs, java.io.File stateFile)
{
Pair <string, string> data = ReadFromFile(fs, stateFile, null);
if (data == null)
{
return(null);
}
return(MigrationStatus.valueOf(data.First()));
}
private static Org.Neo4j.Helpers.Collection.Pair <string, string> ReadFromFile(Org.Neo4j.Io.fs.FileSystemAbstraction fs, java.io.File file, MigrationStatus expectedSate)
{
try
{
using (StreamReader reader = new StreamReader(fs.OpenAsReader(file, StandardCharsets.UTF_8)))
{
string state = reader.ReadLine().Trim();
if (expectedSate != null && !expectedSate.name().Equals(state))
{
throw new System.InvalidOperationException("Not in the expected state, expected=" + expectedSate.name() + ", actual=" + state);
}
string info = reader.ReadLine().Trim();
return(Pair.of(state, info));
}
}
catch (FileNotFoundException)
{
return(null);
}
catch (IOException e)
{
throw new Exception(e);
}
}
public bool IsNeededFor(MigrationStatus current)
{
return(current == null || this.ordinal() >= current.ordinal());
}