/**
* Return the Transaction for {@code destination} that is backed up to {@code file}. This method
* will finish committing the transaction before returning.
*
* @param destination
* @param file
* @return The restored Transaction
*/
public static void recover(Engine destination, String file) {
try {
Transaction transaction =
new Transaction(
destination,
FileSystem.map(file, MapMode.READ_ONLY, 0, FileSystem.getFileSize(file)));
transaction.invokeSuperDoCommit();
FileSystem.deleteFile(file);
} catch (Exception e) {
Logger.warn(
"Attempted to recover a transaction from {}, "
+ "but the data is corrupted. This indicates that "
+ "Concourse Server shutdown before the transaction "
+ "could properly commit, so none of the data "
+ "in the transaction has persisted.",
file);
Logger.debug("Transaction backup in {} is corrupt because " + "of {}", file, e);
FileSystem.deleteFile(file);
}
}
@Override
protected void doCommit() {
String file = ((Engine) destination).transactionStore + File.separator + id + ".txn";
FileChannel channel = FileSystem.getFileChannel(file);
try {
channel.write(serialize());
channel.force(true);
Logger.info("Created backup for transaction {} at '{}'", this, file);
invokeSuperDoCommit();
FileSystem.deleteFile(file);
} catch (IOException e) {
throw Throwables.propagate(e);
} finally {
FileSystem.closeFileChannel(channel);
}
}