func directMultiGet(kvstore *goforestdb.KVStore, keysIn [][]byte) (
valsOut [][]byte,
valsRelease func(),
err error) {
keys := make([]*C.char, len(keysIn))
key_lens := make([]C.size_t, len(keysIn))
vals := make([]*C.char, len(keysIn))
val_lens := make([]C.size_t, len(keysIn))
for i, key := range keysIn {
keys[i] = (*C.char)(unsafe.Pointer(&key[0]))
key_lens[i] = (C.size_t)(len(key))
}
valsRelease = func() {
C.blevex_forestdb_free_bufs(
(C.size_t)(len(vals)), (**C.char)(unsafe.Pointer(&vals[0])))
for i := range vals {
vals[i] = nil
}
}
errNo := C.blevex_forestdb_multi_get(
(*C.fdb_kvs_handle)(kvstore.Handle()),
(C.size_t)(len(keys)),
(**C.char)(unsafe.Pointer(&keys[0])),
(*C.size_t)(unsafe.Pointer(&key_lens[0])),
(**C.char)(unsafe.Pointer(&vals[0])),
(*C.size_t)(unsafe.Pointer(&val_lens[0])))
if int(errNo) != 0 {
valsRelease()
return nil, nil, goforestdb.Error(errNo)
}
valsOut = make([][]byte, len(vals))
for i, val := range vals {
if val != nil {
valsOut[i] = charToByte(val, val_lens[i])
}
}
return valsOut, valsRelease, nil
}
func (b *BatchEx) apply() error {
// Hold onto final merge key/val bytes so GC doesn't collect them
// until we're done.
var mergeBytes [][]byte
if len(b.merge.Merges) > 0 {
mergeBytes = make([][]byte, 0, len(b.merge.Merges)*2)
mergeKeys := make([][]byte, len(b.merge.Merges))
mergeOps := make([][][]byte, len(b.merge.Merges))
i := 0
for key, ops := range b.merge.Merges {
mergeKeys[i] = []byte(key)
mergeOps[i] = ops
i += 1
}
currVals, releaseVals, err := directMultiGet(b.w.kvstore, mergeKeys)
if err != nil {
return err
}
defer releaseVals()
for i, key := range mergeKeys {
mergedVal, ok := b.w.store.mo.FullMerge(key, currVals[i], mergeOps[i])
if !ok {
return fmt.Errorf("forestdb BatchEx merge operator failure,"+
" key: %s, currVal: %q, mergeOps: %#v, i: %d",
key, currVals[i], mergeOps[i], i)
}
mergeBytes = append(mergeBytes, key, mergedVal)
b.Set(key, mergedVal)
}
}
var num_sets C.int
var set_keys **C.char
var set_keys_sizes *C.size_t
var set_vals **C.char
var set_vals_sizes *C.size_t
var num_deletes C.int
var delete_keys **C.char
var delete_keys_sizes *C.size_t
if b.num_sets > 0 {
num_sets = (C.int)(b.num_sets)
set_keys = (**C.char)(unsafe.Pointer(&b.set_keys[0]))
set_keys_sizes = (*C.size_t)(unsafe.Pointer(&b.set_keys_sizes[0]))
set_vals = (**C.char)(unsafe.Pointer(&b.set_vals[0]))
set_vals_sizes = (*C.size_t)(unsafe.Pointer(&b.set_vals_sizes[0]))
}
if b.num_deletes > 0 {
num_deletes = (C.int)(b.num_deletes)
delete_keys = (**C.char)(unsafe.Pointer(&b.delete_keys[0]))
delete_keys_sizes = (*C.size_t)(unsafe.Pointer(&b.delete_keys_sizes[0]))
}
errNo := C.blevex_forestdb_execute_direct_batch(
(*C.fdb_kvs_handle)(b.w.kvstore.Handle()),
num_sets,
set_keys,
set_keys_sizes,
set_vals,
set_vals_sizes,
num_deletes,
delete_keys,
delete_keys_sizes)
if int(errNo) != 0 {
return goforestdb.Error(errNo)
}
if mergeBytes != nil { // Ok to let GC have mergeBytes now.
mergeBytes = nil
}
return nil
}