76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
/*
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* FDBTypes.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fdbclient/FDBTypes.h"
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#include "fdbclient/Knobs.h"
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KeyRef keyBetween(const KeyRangeRef& keys) {
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int pos = 0; // will be the position of the first difference between keys.begin and keys.end
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int minSize = std::min(keys.begin.size(), keys.end.size());
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for (; pos < minSize && pos < CLIENT_KNOBS->SPLIT_KEY_SIZE_LIMIT; pos++) {
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if (keys.begin[pos] != keys.end[pos]) {
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return keys.end.substr(0, pos + 1);
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}
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}
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// If one more character keeps us in the limit, and the latter key is simply
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// longer, then we only need one more byte of the end string.
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if (pos < CLIENT_KNOBS->SPLIT_KEY_SIZE_LIMIT && keys.begin.size() < keys.end.size()) {
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return keys.end.substr(0, pos + 1);
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}
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return keys.end;
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}
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void KeySelectorRef::setKey(KeyRef const& key) {
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// There are no keys in the database with size greater than KEY_SIZE_LIMIT, so if this key selector has a key
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// which is large, then we can translate it to an equivalent key selector with a smaller key
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if (key.size() >
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(key.startsWith(LiteralStringRef("\xff")) ? CLIENT_KNOBS->SYSTEM_KEY_SIZE_LIMIT : CLIENT_KNOBS->KEY_SIZE_LIMIT))
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this->key = key.substr(0,
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(key.startsWith(LiteralStringRef("\xff")) ? CLIENT_KNOBS->SYSTEM_KEY_SIZE_LIMIT
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: CLIENT_KNOBS->KEY_SIZE_LIMIT) +
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1);
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else
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this->key = key;
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}
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std::string KeySelectorRef::toString() const {
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if (offset > 0) {
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if (orEqual)
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return format("%d+firstGreaterThan(%s)", offset - 1, printable(key).c_str());
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else
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return format("%d+firstGreaterOrEqual(%s)", offset - 1, printable(key).c_str());
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} else {
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if (orEqual)
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return format("%d+lastLessOrEqual(%s)", offset, printable(key).c_str());
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else
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return format("%d+lastLessThan(%s)", offset, printable(key).c_str());
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}
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}
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std::string describe(const std::string& s) {
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return s;
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}
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std::string describe(UID const& item) {
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return item.shortString();
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}
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