79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/*
|
|
* FDBTypes.cpp
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* 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 "fdbclient/FDBTypes.h"
|
|
#include "fdbclient/Knobs.h"
|
|
#include "fdbclient/NativeAPI.actor.h"
|
|
|
|
KeyRef keyBetween(const KeyRangeRef& keys) {
|
|
int pos = 0; // will be the position of the first difference between keys.begin and keys.end
|
|
int minSize = std::min(keys.begin.size(), keys.end.size());
|
|
for (; pos < minSize && pos < CLIENT_KNOBS->SPLIT_KEY_SIZE_LIMIT; pos++) {
|
|
if (keys.begin[pos] != keys.end[pos]) {
|
|
return keys.end.substr(0, pos + 1);
|
|
}
|
|
}
|
|
|
|
// If one more character keeps us in the limit, and the latter key is simply
|
|
// longer, then we only need one more byte of the end string.
|
|
if (pos < CLIENT_KNOBS->SPLIT_KEY_SIZE_LIMIT && keys.begin.size() < keys.end.size()) {
|
|
return keys.end.substr(0, pos + 1);
|
|
}
|
|
|
|
return keys.end;
|
|
}
|
|
|
|
void KeySelectorRef::setKey(KeyRef const& key) {
|
|
// There are no keys in the database with size greater than the max key size, so if this key selector has a key
|
|
// which is large, then we can translate it to an equivalent key selector with a smaller key
|
|
int64_t maxKeySize = getMaxKeySize(key);
|
|
if (key.size() > maxKeySize) {
|
|
this->key = key.substr(0, maxKeySize + 1);
|
|
} else {
|
|
this->key = key;
|
|
}
|
|
}
|
|
|
|
void KeySelectorRef::setKeyUnlimited(KeyRef const& key) {
|
|
this->key = key;
|
|
}
|
|
|
|
std::string KeySelectorRef::toString() const {
|
|
if (offset > 0) {
|
|
if (orEqual)
|
|
return format("%d+firstGreaterThan(%s)", offset - 1, printable(key).c_str());
|
|
else
|
|
return format("%d+firstGreaterOrEqual(%s)", offset - 1, printable(key).c_str());
|
|
} else {
|
|
if (orEqual)
|
|
return format("%d+lastLessOrEqual(%s)", offset, printable(key).c_str());
|
|
else
|
|
return format("%d+lastLessThan(%s)", offset, printable(key).c_str());
|
|
}
|
|
}
|
|
|
|
std::string describe(const std::string& s) {
|
|
return s;
|
|
}
|
|
|
|
std::string describe(UID const& item) {
|
|
return item.shortString();
|
|
}
|