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a31c8aa Add NewAppendableFile for win32 environment 1913d71 Merge upstream LevelDB 1.19 3080a45 Increase leveldb version to 1.19. fa6dc01 A zippy change broke test assumptions about the size of compressed output. Fix the tests by allowing more slop in zippy's behavior. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=123432472 06a191b fix problems in LevelDB's caching code a7bff69 Fix LevelDB build when asserts are enabled in release builds. (#367) ea992b4 Change std::uint64_t to uint64_t (#354) e84b5bd This CL fixes a bug encountered when reading records from leveldb files that have been split, as in a [] input task split. 3211343 Deleted redundant null ptr check prior to delete. 7306ef8 Merge pull request #348 from randomascii/master 6b18316 Fix signed/unsigned mismatch on VC++ builds adbe3eb Putting build artifacts in subdirectory. 2d0320a Merge pull request #329 from ralphtheninja/travis-badge dd1c3c3 add travis build badge 43fcf23 Merge pull request #328 from cmumford/master 9fcae61 Added a Travis CI build file. dac40d2 Merge pull request #284 from ideawu/master 8ec241a Merge pull request #317 from falvojr/patch-1 5d36bed Merge pull request #272 from vapier/master 4753c9b Added a contributors section to README.md e2446d0 Merge pull request #275 from paulirish/patch-1 706b7f8 Resolve race when getting approximate-memory-usage property 3c9ff3c Only compiling TrimSpace on linux. f8d205c Including atomic_pointer.h in port_posix 889de31 Let LevelDB use xcrun to determine Xcode.app path instead of using a hardcoded path. 528c2bc Add "approximate-memory-usage" property to leveldb::DB::GetProperty 359b6bc Add leveldb::Cache::Prune 50e77a8 Fix size_t/int comparison/conversion issues in leveldb. 5208e79 Added leveldb::Status::IsInvalidArgument() method. ce45404 Suppress error reporting after seeking but before a valid First or Full record is encountered. b9afa1f include <assert> -> <cassert> edf2939 Update README.md 65190ac Will not reuse manifest if reuse_logs options is false. ac1d69d LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened. 76bba13 fix indent 8fcceb2 log compaction output file's level along with number 0e0f074 documentation. improved link c85addc readme: improved documentation link ceff6f1 Fix Android/MIPS build. 77948e7 Add benchmark that measures cost of repeatedly opening the database. 34ad72e Move header guard below copyright banner. a75d435 Clean up layering of storage/leveldb/... b234f65 Added a new fault injection test. c4c38f9 Add arm64 support to leveldb. cea9b10 Fixed incorrect comment wording for Iterator::Seek. c00c569 Deleted old README file. git-subtree-dir: src/leveldb git-subtree-split: a31c8aa408d5594830f7cb20ead1ef1dff51b79e
66 lines
2 KiB
C++
66 lines
2 KiB
C++
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_
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#define STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_
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#include "leveldb/iterator.h"
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#include "leveldb/slice.h"
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namespace leveldb {
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// A internal wrapper class with an interface similar to Iterator that
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// caches the valid() and key() results for an underlying iterator.
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// This can help avoid virtual function calls and also gives better
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// cache locality.
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class IteratorWrapper {
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public:
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IteratorWrapper(): iter_(NULL), valid_(false) { }
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explicit IteratorWrapper(Iterator* iter): iter_(NULL) {
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Set(iter);
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}
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~IteratorWrapper() { delete iter_; }
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Iterator* iter() const { return iter_; }
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// Takes ownership of "iter" and will delete it when destroyed, or
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// when Set() is invoked again.
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void Set(Iterator* iter) {
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delete iter_;
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iter_ = iter;
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if (iter_ == NULL) {
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valid_ = false;
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} else {
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Update();
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}
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}
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// Iterator interface methods
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bool Valid() const { return valid_; }
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Slice key() const { assert(Valid()); return key_; }
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Slice value() const { assert(Valid()); return iter_->value(); }
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// Methods below require iter() != NULL
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Status status() const { assert(iter_); return iter_->status(); }
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void Next() { assert(iter_); iter_->Next(); Update(); }
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void Prev() { assert(iter_); iter_->Prev(); Update(); }
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void Seek(const Slice& k) { assert(iter_); iter_->Seek(k); Update(); }
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void SeekToFirst() { assert(iter_); iter_->SeekToFirst(); Update(); }
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void SeekToLast() { assert(iter_); iter_->SeekToLast(); Update(); }
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private:
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void Update() {
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valid_ = iter_->Valid();
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if (valid_) {
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key_ = iter_->key();
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}
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}
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Iterator* iter_;
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bool valid_;
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Slice key_;
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_
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