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/*
* tuplemerger.cpp
*
* Copyright 2009-2012 Yahoo! Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "tupleMerger.h"
#include "bLSM.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();
}
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