/**
* Changes all keys to "prefix keys" in the given IN. Called after reading an IN from disk via
* IN.postFetchInit.
*
* <p>The conversion of IN keys is invoked from the IN class when an IN is fetched, rather than
* invoked from the DupConvert class directly, for performance and simplicity. If it were invoked
* from the DupConvert class, we would have to iterate over all INs in a separate initial pass.
* This is both more time consuming, and more complex to implement properly so that eviction is
* possible. Instead, conversion occurs when an old format IN is loaded.
*
* <p>Enter/leave with 'in' unlatched.
*/
public static void convertInKeys(final DatabaseImpl dbImpl, final IN in) {
/* Nothing to convert for non-duplicates DB. */
if (!dbImpl.getSortedDuplicates()) {
return;
}
/* DIN/DBIN do not need conversion either. */
if (in instanceof DIN || in instanceof DBIN) {
return;
}
in.latch();
try {
for (int i = 0; i < in.getNEntries(); i += 1) {
byte[] oldKey = in.getKey(i);
byte[] newKey = DupKeyData.makePrefixKey(oldKey, 0, oldKey.length);
in.updateEntry(i, in.getTarget(i), in.getLsn(i), newKey);
}
byte[] oldKey = in.getIdentifierKey();
byte[] newKey = DupKeyData.makePrefixKey(oldKey, 0, oldKey.length);
in.setIdentifierKey(newKey);
assert in.verifyMemorySize();
} finally {
in.releaseLatch();
}
}