//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public long lookup(long txId) throws java.io.IOException
public virtual long Lookup(long txId)
{
// First off see if the requested txId is in fact the last committed transaction.
// If so then we can extract the checksum directly from the transaction id store.
TransactionId lastCommittedTransaction = _transactionIdStore.LastCommittedTransaction;
if (lastCommittedTransaction.TransactionIdConflict() == txId)
{
return(lastCommittedTransaction.Checksum());
}
// Check if the requested txId is upgrade transaction
// if so then use checksum form transaction id store.
// That checksum can take specific values that should not be re-evaluated.
if (_upgradeTransaction.transactionId() == txId)
{
return(_upgradeTransaction.checksum());
}
// It wasn't, so go look for it in the transaction store.
// Intentionally let potentially thrown IOException (and NoSuchTransactionException) be thrown
// from this call below, it's part of the contract of this method.
try
{
return(_logicalTransactionStore.getMetadataFor(txId).Checksum);
}
catch (NoSuchTransactionException e)
{
// So we truly couldn't find the checksum for this txId, go ahead and throw
throw withMessage(e, e.Message + " | transaction id store says last transaction is " + lastCommittedTransaction + " and last upgrade transaction is " + _upgradeTransaction);
}
}
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Test public void shouldGenerateTransactionInformationWhenLogsAreEmpty() throws Exception
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
public virtual void ShouldGenerateTransactionInformationWhenLogsAreEmpty()
{
// given
long txId = 1;
DatabaseLayout databaseLayout = _directory.databaseLayout();
File neoStore = databaseLayout.MetadataStore();
neoStore.createNewFile();
Config config = mock(typeof(Config));
LogService logService = new SimpleLogService(NullLogProvider.Instance, NullLogProvider.Instance);
// when
// ... transaction info not in neo store
assertEquals(FIELD_NOT_PRESENT, getRecord(_pageCache, neoStore, LAST_TRANSACTION_ID));
assertEquals(FIELD_NOT_PRESENT, getRecord(_pageCache, neoStore, LAST_TRANSACTION_CHECKSUM));
assertEquals(FIELD_NOT_PRESENT, getRecord(_pageCache, neoStore, LAST_TRANSACTION_COMMIT_TIMESTAMP));
// ... and with migrator
StoreMigrator migrator = new StoreMigrator(_fileSystemRule.get(), _pageCache, config, logService, _jobScheduler);
TransactionId actual = migrator.ExtractTransactionIdInformation(neoStore, txId);
// then
assertEquals(txId, actual.TransactionIdConflict());
assertEquals(Org.Neo4j.Kernel.impl.transaction.log.TransactionIdStore_Fields.BASE_TX_CHECKSUM, actual.Checksum());
assertEquals(Org.Neo4j.Kernel.impl.transaction.log.TransactionIdStore_Fields.BASE_TX_COMMIT_TIMESTAMP, actual.CommitTimestamp());
}
public virtual RequestContext NewRequestContext(long epoch, int machineId, int eventIdentifier)
{
TransactionId lastTx = _txIdStore.LastCommittedTransaction;
// TODO beware, there's a race between getting tx id and checksum, and changes to last tx
// it must be fixed
return(new RequestContext(epoch, machineId, eventIdentifier, lastTx.TransactionIdConflict(), lastTx.Checksum()));
}