4f74dfd45f
git-svn-id: svn+ssh://svn.corp.yahoo.com/yahoo/yrl/labs/pnuts/code/logstore@2448 8dad8b1f-cf64-0410-95b6-bcf113ffbcfe
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
#include "tuplemerger.h"
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#include "logstore.h"
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// t2 is the newer tuple.
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// we return deletes here. our caller decides what to do with them.
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datatuple* tuplemerger::merge(const datatuple *t1, const datatuple *t2)
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{
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datatuple *t;
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if(t1->isDelete() && t2->isDelete()) {
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t = t2->create_copy();
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} else if(t1->isDelete()) //delete -> t2
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{
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t = t2->create_copy();
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}
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else if(t2->isDelete())
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{
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t = t2->create_copy();
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}
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else //neither is a delete
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{
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t = (*merge_fp)(t1,t2);
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}
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return t;
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}
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/**
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* appends the data in t2 to data from t1
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*
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* deletes are handled by the tuplemerger::merge function
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* so here neither t1 nor t2 is a delete datatuple
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**/
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datatuple* append_merger(const datatuple *t1, const datatuple *t2)
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{
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assert(!(t1->isDelete() || t2->isDelete()));
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len_t keylen = t1->keylen();
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len_t datalen = t1->datalen() + t2->datalen();
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byte * data = (byte*)malloc(datalen);
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memcpy(data, t1->data(), t1->datalen());
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memcpy(data + t1->datalen(), t2->data(), t2->datalen());
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return datatuple::create(t1->key(), keylen, data, datalen);
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}
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/**
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* replaces the data with data from t2
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*
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* deletes are handled by the tuplemerger::merge function
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* so here neither t1 nor t2 is a delete datatuple
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**/
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datatuple* replace_merger(const datatuple *t1, const datatuple *t2)
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{
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return t2->create_copy();
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}
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