/**
* Commit or abort a given transaction; release all locks associated to the transaction.
*
* @param tid the ID of the transaction requesting the unlock
* @param commit a flag indicating whether we should commit or abort
*/
public void transactionComplete(TransactionId tid, boolean commit) throws IOException {
if (commit) {
Set<PageId> dirtiedFlushedPages = transactionsToDirtiedFlushedPages.get(tid);
for (PageId pageId : pageIdToPages.keySet()) {
Page page = pageIdToPages.get(pageId);
if (tid.equals(page.isDirty())) {
flushPage(pageId);
// use current page contents as the before-image
// for the next transaction that modifies this page.
page.setBeforeImage();
} else if (dirtiedFlushedPages != null && dirtiedFlushedPages.contains(pageId)) {
page.setBeforeImage();
}
}
} else {
for (PageId pageId : pageIdToPages.keySet()) {
Page page = pageIdToPages.get(pageId);
if (tid.equals(page.isDirty())) {
pageIdToPages.put(pageId, page.getBeforeImage());
page.markDirty(false, null);
}
}
}
transactionsToDirtiedFlushedPages.remove(tid);
lockManager.releasePages(tid);
// if commit, flush dirty pages associated with transaction
// if !commit, restore dirty pages associated with transaction to
// previous
// state
// release all locks (and other state? don't think there is any)
}
