142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
/*
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* RYWIterator.h
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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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#ifndef FDBCLIENT_RYWITERATOR_H
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#define FDBCLIENT_RYWITERATOR_H
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#pragma once
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#include "SnapshotCache.h"
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#include "WriteMap.h"
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class RYWIterator {
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public:
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RYWIterator( SnapshotCache* snapshotCache, WriteMap* writeMap ) : cache(snapshotCache), writes(writeMap), begin_key_cmp(0), end_key_cmp(0) {}
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enum SEGMENT_TYPE { UNKNOWN_RANGE, EMPTY_RANGE, KV };
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static const SEGMENT_TYPE typeMap[12];
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SEGMENT_TYPE type();
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bool is_kv();
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bool is_unknown_range();
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bool is_empty_range();
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bool is_unreadable();
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bool is_dependent();
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ExtStringRef beginKey();
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ExtStringRef endKey();
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KeyValueRef const& kv( Arena& arena );
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RYWIterator& operator++();
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RYWIterator& operator--();
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bool operator == ( const RYWIterator& r ) const;
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void skip( KeyRef key );
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void skipContiguous( KeyRef key );
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void skipContiguousBack( KeyRef key );
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WriteMap::iterator& extractWriteMapIterator();
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// Really this should return an iterator by value, but for performance it's convenient to actually grab the internal one. Consider copying the return value if performance isn't critical.
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// If you modify the returned iterator, it invalidates this iterator until the next call to skip()
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void dbg();
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private:
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int begin_key_cmp; // -1 if cache.beginKey() < writes.beginKey(), 0 if ==, +1 if >
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int end_key_cmp; //
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SnapshotCache::iterator cache;
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WriteMap::iterator writes;
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KeyValueRef temp;
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void updateCmp();
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};
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class RandomTestImpl {
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public:
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static ValueRef getRandomValue(Arena& arena) {
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return ValueRef(arena, std::string(g_random->randomInt(0, 1000), 'x'));
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}
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static ValueRef getRandomVersionstampValue(Arena& arena) {
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int len = g_random->randomInt(10, 98);
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std::string value = std::string(len, 'x');
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int32_t pos = g_random->randomInt(0, len - 9);
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if (g_random->random01() < 0.01) {
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pos = value.size() - 10;
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}
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pos = littleEndian32(pos);
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value += std::string((const char*)&pos, sizeof(int32_t));
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return ValueRef(arena, value);
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}
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static ValueRef getRandomVersionstampKey(Arena& arena) {
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int idx = g_random->randomInt(0, 100);
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std::string key = format("%010d", idx / 3);
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if (idx % 3 >= 1)
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key += '\x00';
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if (idx % 3 >= 2)
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key += '\x00';
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int32_t pos = key.size() - g_random->randomInt(0, 3);
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if (g_random->random01() < 0.01) {
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pos = 0;
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}
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key = key.substr(0, pos);
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key += "XXXXXXXXYY";
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key += std::string(g_random->randomInt(0, 3), 'z');
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pos = littleEndian32(pos);
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key += std::string((const char*)&pos, sizeof(int32_t));
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return ValueRef(arena, key);
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}
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static KeyRef getRandomKey(Arena& arena) {
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return getKeyForIndex(arena, g_random->randomInt(0, 100));
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}
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static KeyRef getKeyForIndex(Arena& arena, int idx) {
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std::string key = format("%010d", idx / 3);
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if (idx % 3 >= 1)
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key += '\x00';
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if (idx % 3 >= 2)
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key += '\x00';
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return KeyRef(arena, key);
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}
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static KeyRangeRef getRandomRange(Arena& arena) {
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int startLocation = g_random->randomInt(0, 100);
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int endLocation = startLocation + g_random->randomInt(1, 1 + 100 - startLocation);
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return KeyRangeRef(getKeyForIndex(arena, startLocation), getKeyForIndex(arena, endLocation));
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}
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static KeySelectorRef getRandomKeySelector(Arena& arena) {
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return KeySelectorRef(getRandomKey(arena), g_random->random01() < 0.5, g_random->randomInt(-10, 10));
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}
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};
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void testESR();
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void testSnapshotCache();
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#endif
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