stasis-bLSM/tuplemerger.cpp
sears 5be84f59e8 add support for early tombstone dropping, extend datatuple format to support timestamps
git-svn-id: svn+ssh://svn.corp.yahoo.com/yahoo/yrl/labs/pnuts/code/logstore@2451 8dad8b1f-cf64-0410-95b6-bcf113ffbcfe
2011-04-22 22:54:49 +00:00

44 lines
1.3 KiB
C++

#include "tuplemerger.h"
#include "logstore.h"
// t2 is the newer tuple.
// we return deletes here. our caller decides what to do with them.
datatuple* tuplemerger::merge(const datatuple *t1, const datatuple *t2)
{
if(!(t1->isDelete() || t2->isDelete())) {
return (*merge_fp)(t1,t2);
} else {
// if there is at least one tombstone, we return t2 intact.
// t1 tombstone -> ignore it, and return t2.
// t2 tombstone -> return a tombstone (like t2).
return t2->create_copy();
}
}
/**
* appends the data in t2 to data from t1
*
* deletes are handled by the tuplemerger::merge function
* so here neither t1 nor t2 is a delete datatuple
**/
datatuple* append_merger(const datatuple *t1, const datatuple *t2)
{
assert(!(t1->isDelete() || t2->isDelete()));
len_t rawkeylen = t1->rawkeylen();
len_t datalen = t1->datalen() + t2->datalen();
byte * data = (byte*)malloc(datalen);
memcpy(data, t1->data(), t1->datalen());
memcpy(data + t1->datalen(), t2->data(), t2->datalen());
return datatuple::create(t1->rawkey(), rawkeylen, data, datalen);
}
/**
* replaces the data with data from t2
*
* deletes are handled by the tuplemerger::merge function
* so here neither t1 nor t2 is a delete datatuple
**/
datatuple* replace_merger(const datatuple *t1, const datatuple *t2)
{
return t2->create_copy();
}