/**
* Prepare a transaction.
*
* @param session the session
* @param transaction the name of the transaction
*/
void prepareCommit(Session session, String transaction) {
if (trace.isDebugEnabled()) {
trace.debug("log prepare commit s: " + session.getId() + ", " + transaction);
}
if (store.getDatabase().getPageStore() == null) {
// database already closed
return;
}
// store it on a separate log page
int pageSize = store.getPageSize();
pageOut.flush();
pageOut.fillPage();
Data buffer = getBuffer();
buffer.writeByte((byte) PREPARE_COMMIT);
buffer.writeVarInt(session.getId());
buffer.writeString(transaction);
if (buffer.length() >= PageStreamData.getCapacity(pageSize)) {
throw DbException.getInvalidValueException("transaction name (too long)", transaction);
}
write(buffer);
// store it on a separate log page
flushOut();
pageOut.fillPage();
if (store.getDatabase().getFlushOnEachCommit()) {
flush();
}
}
/** Switch to a new log section. */
void checkpoint() {
Data buffer = getBuffer();
buffer.writeByte((byte) CHECKPOINT);
write(buffer);
undo = new BitField();
logSectionId++;
logPos = 0;
pageOut.flush();
pageOut.fillPage();
int currentDataPage = pageOut.getCurrentDataPageId();
logSectionPageMap.put(logSectionId, currentDataPage);
}
private void flushOut() {
pageOut.flush();
}
