@Override
public void abort(Transaction txn) {
debug("abort");
if (nodeTableJournal == null)
throw new TDBTransactionException(
txn.getLabel() + ": Not in a transaction for a commit to happen");
// Ensure the cache does not flush.
nodeTableJournal = null;
// then make sure the journal file is empty.
if (journalObjFile != null) {
journalObjFile.truncate(journalObjFileStartOffset);
journalObjFile.sync();
}
finish();
}
@Override
public void begin(Transaction txn) {
// debug("%s begin", txn.getLabel()) ;
if (this.txn.getTxnId() != txn.getTxnId())
throw new TDBException(
String.format("Different transactions: %s %s", this.txn.getLabel(), txn.getLabel()));
if (passthrough) throw new TDBException("Already active");
passthrough = false;
allocOffset = base.allocOffset().getId();
// base node table empty e.g. first use.
journalObjFileStartOffset = journalObjFile.length();
// Because the data is written in prepare, the journal of object data is
// always empty at the start of a transaction.
if (journalObjFileStartOffset != 0)
warn(
log,
"%s journalStartOffset not zero: %d/0x%02X",
txn.getLabel(),
journalObjFileStartOffset,
journalObjFileStartOffset);
allocOffset += journalObjFileStartOffset;
this.nodeTableJournal = new NodeTableNative(nodeIndex, journalObjFile);
this.nodeTableJournal = NodeTableCache.create(nodeTableJournal, CacheSize, CacheSize, 100);
// This class knows about non-mappable inline values. mapToJournal(NodeId)/mapFromJournal.
this.nodeTableJournal = NodeTableInline.create(nodeTableJournal);
}
@Override
public void close() {
if (nodeIndex != null) nodeIndex.close();
nodeIndex = null;
// Closing the journal flushes it; i.e. disk IO.
if (journalObjFile != null) journalObjFile.close();
journalObjFile = null;
}
@Override
public void commitPrepare(Transaction txn) {
debug("commitPrepare");
// The node table is append-only so it can be written during prepare.
// The index isn't written (via the transaction journal) until enact.
if (nodeTableJournal == null)
throw new TDBTransactionException(
txn.getLabel() + ": Not in a transaction for a commit to happen");
writeNodeJournal();
if (journalObjFile != null && journalObjFile.length() != 0) {
long x = journalObjFile.length();
throw new TDBTransactionException(
txn.getLabel() + ": journalObjFile not cleared (" + x + ")");
}
}
private void writeNodeJournal() {
long expected = base.allocOffset().getId();
long len = journalObjFile.length();
if (expected != allocOffset)
warn(log, "Inconsistency: base.allocOffset() = %d : allocOffset = %d", expected, allocOffset);
long newbase = -1;
append(); // Calls all() which does a buffer flish.
// Reset (in case we use this again)
nodeIndex.clear();
journalObjFile.truncate(journalObjFileStartOffset); // Side effect is a buffer flush.
// journalObjFile.sync() ;
journalObjFile.close(); // Side effect is a buffer flush.
journalObjFile = null;
base.sync();
allocOffset =
-99; // base.allocOffset().getId() ; // Will be invalid as we may write through to the base
// table later.
passthrough = true;
}
public NodeTableTrans(
Transaction txn, String label, NodeTable sub, Index nodeIndex, ObjectFile objFile) {
this.txn = txn;
this.base = sub;
this.nodeIndex = nodeIndex;
this.journalObjFile = objFile;
// Clear bytes from an old run
// (a crash while writing means the old transaction did not commit
// any bytes in the file are junk)
// This is coupled to the fact the prepare phase does the actually data writing.
journalObjFile.truncate(0);
this.label = label;
}
// Debugging only
private void dump() {
System.err.println(">>>>>>>>>>");
System.err.println("label = " + label);
System.err.println("txn = " + txn);
System.err.println("offset = " + allocOffset);
System.err.println("journalStartOffset = " + journalObjFileStartOffset);
System.err.println("journal = " + journalObjFile.getLabel());
if (true) return;
System.err.println("nodeTableJournal >>>");
Iterator<Pair<NodeId, Node>> iter = nodeTableJournal.all();
for (; iter.hasNext(); ) {
Pair<NodeId, Node> x = iter.next();
NodeId nodeId = x.getLeft();
Node node = x.getRight();
NodeId mapped = mapFromJournal(nodeId);
// debug("append: %s -> %s", x, mapFromJournal(nodeId)) ;
// This does the write.
NodeId nodeId2 = base.getAllocateNodeId(node);
System.err.println(x + " mapped=" + mapped + " getAlloc=" + nodeId2);
}
System.err.println("journal >>>");
Iterator<Pair<Long, ByteBuffer>> iter1 = this.journalObjFile.all();
for (; iter1.hasNext(); ) {
Pair<Long, ByteBuffer> p = iter1.next();
System.err.println(p.getLeft() + " : " + p.getRight());
ByteBufferLib.print(System.err, p.getRight());
}
System.err.println("nodeIndex >>>");
Iterator<Record> iter2 = this.nodeIndex.iterator();
for (; iter2.hasNext(); ) {
Record r = iter2.next();
System.err.println(r);
}
System.err.println("<<<<<<<<<<");
}