//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: private long doCheckPoint(TriggerInfo triggerInfo) throws java.io.IOException
private long DoCheckPoint(TriggerInfo triggerInfo)
{
try
{
using (LogCheckPointEvent @event = _tracer.beginCheckPoint())
{
long[] lastClosedTransaction = _transactionIdStore.LastClosedTransaction;
long lastClosedTransactionId = lastClosedTransaction[0];
LogPosition logPosition = new LogPosition(lastClosedTransaction[1], lastClosedTransaction[2]);
string prefix = triggerInfo.Describe(lastClosedTransactionId);
/*
* Check kernel health before going into waiting for transactions to be closed, to avoid
* getting into a scenario where we would await a condition that would potentially never
* happen.
*/
_databaseHealth.assertHealthy(typeof(IOException));
/*
* First we flush the store. If we fail now or during the flush, on recovery we'll find the
* earlier check point and replay from there all the log entries. Everything will be ok.
*/
_msgLog.info(prefix + " checkpoint started...");
long startTime = currentTimeMillis();
_storageEngine.flushAndForce(_ioLimiter);
/*
* Check kernel health before going to write the next check point. In case of a panic this check point
* will be aborted, which is the safest alternative so that the next recovery will have a chance to
* repair the damages.
*/
_databaseHealth.assertHealthy(typeof(IOException));
_appender.checkPoint(logPosition, @event);
_threshold.checkPointHappened(lastClosedTransactionId);
_msgLog.info(prefix + " checkpoint completed in " + duration(currentTimeMillis() - startTime));
/*
* Prune up to the version pointed from the latest check point,
* since it might be an earlier version than the current log version.
*/
_logPruning.pruneLogs(logPosition.LogVersion);
_lastCheckPointedTx = lastClosedTransactionId;
return(lastClosedTransactionId);
}
}
catch (Exception t)
{
// Why only log failure here? It's because check point can potentially be made from various
// points of execution e.g. background thread triggering check point if needed and during
// shutdown where it's better to have more control over failure handling.
_msgLog.error("Checkpoint failed", t);
throw t;
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public long append(org.neo4j.kernel.impl.api.TransactionToApply batch, org.neo4j.kernel.impl.transaction.tracing.LogAppendEvent logAppendEvent) throws java.io.IOException
public override long Append(TransactionToApply batch, LogAppendEvent logAppendEvent)
{
// Assigned base tx id just to make compiler happy
long lastTransactionId = TransactionIdStore_Fields.BASE_TX_ID;
// Synchronized with logFile to get absolute control over concurrent rotations happening
lock ( _logFile )
{
// Assert that kernel is healthy before making any changes
_databaseHealth.assertHealthy(typeof(IOException));
using (SerializeTransactionEvent serialiseEvent = logAppendEvent.BeginSerializeTransaction())
{
// Append all transactions in this batch to the log under the same logFile monitor
TransactionToApply tx = batch;
while (tx != null)
{
long transactionId = _transactionIdStore.nextCommittingTransactionId();
// If we're in a scenario where we're merely replicating transactions, i.e. transaction
// id have already been generated by another entity we simply check that our id
// that we generated match that id. If it doesn't we've run into a problem we can't ´
// really recover from and would point to a bug somewhere.
MatchAgainstExpectedTransactionIdIfAny(transactionId, tx);
TransactionCommitment commitment = AppendToLog(tx.TransactionRepresentation(), transactionId);
tx.Commitment(commitment, transactionId);
tx.LogPosition(commitment.LogPosition());
tx = tx.Next();
lastTransactionId = transactionId;
}
}
}
// At this point we've appended all transactions in this batch, but we can't mark any of them
// as committed since they haven't been forced to disk yet. So here we force, or potentially
// piggy-back on another force, but anyway after this call below we can be sure that all our transactions
// in this batch exist durably on disk.
if (ForceAfterAppend(logAppendEvent))
{
// We got lucky and were the one forcing the log. It's enough if ones of all doing concurrent committers
// checks the need for log rotation.
bool logRotated = _logRotation.rotateLogIfNeeded(logAppendEvent);
logAppendEvent.LogRotated = logRotated;
}
// Mark all transactions as committed
PublishAsCommitted(batch);
return(lastTransactionId);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public <EXCEPTION extends Throwable> void assertHealthy(Class<EXCEPTION> cause) throws EXCEPTION
public virtual void AssertHealthy <EXCEPTION>(Type cause) where EXCEPTION : Exception
{
cause = typeof(EXCEPTION);
DatabaseHealth.assertHealthy(cause);
}
