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#include "rocksdb/merge_operator.h"
using std::string;
using std::deque;
using rocksdb::Slice;
using rocksdb::Logger;
using rocksdb::MergeOperator;
using rocksdb::AssociativeMergeOperator;
namespace py_rocks {
class AssociativeMergeOperatorWrapper: public AssociativeMergeOperator {
public:
typedef bool (*merge_func)(
void*,
const Slice& key,
const Slice* existing_value,
const Slice& value,
std::string* new_value,
Logger* logger);
AssociativeMergeOperatorWrapper(
string name,
void* merge_context,
merge_func merge_callback):
name(name),
merge_context(merge_context),
merge_callback(merge_callback)
{}
virtual bool Merge(
const Slice& key,
const Slice* existing_value,
const Slice& value,
std::string* new_value,
Logger* logger) const
{
return this->merge_callback(
this->merge_context,
key,
existing_value,
value,
new_value,
logger);
}
virtual const char* Name() const {
return this->name.c_str();
}
private:
string name;
void* merge_context;
merge_func merge_callback;
};
class MergeOperatorWrapper: public MergeOperator {
public:
typedef bool (*full_merge_func)(
void* ctx,
const Slice& key,
const Slice* existing_value,
const deque<string>& operand_list,
string* new_value,
Logger* logger);
typedef bool (*partial_merge_func)(
void* ctx,
const Slice& key,
const Slice& left_op,
const Slice& right_op,
string* new_value,
Logger* logger);
MergeOperatorWrapper(
string name,
void* full_merge_context,
void* partial_merge_context,
full_merge_func full_merge_callback,
partial_merge_func partial_merge_callback):
name(name),
full_merge_context(full_merge_context),
partial_merge_context(partial_merge_context),
full_merge_callback(full_merge_callback),
partial_merge_callback(partial_merge_callback)
{}
virtual bool FullMerge(
const Slice& key,
const Slice* existing_value,
const deque<string>& operand_list,
string* new_value,
Logger* logger) const
{
return this->full_merge_callback(
this->full_merge_context,
key,
existing_value,
operand_list,
new_value,
logger);
}
virtual bool PartialMerge (
const Slice& key,
const Slice& left_operand,
const Slice& right_operand,
string* new_value,
Logger* logger) const
{
return this->partial_merge_callback(
this->partial_merge_context,
key,
left_operand,
right_operand,
new_value,
logger);
}
virtual const char* Name() const {
return this->name.c_str();
}
private:
string name;
void* full_merge_context;
void* partial_merge_context;
full_merge_func full_merge_callback;
partial_merge_func partial_merge_callback;
};
}
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