e79ad9e184
Summary: We want to provide a way to detect whether an iterator is stale and needs to be recreated. Add a iterator property to return version number. Test Plan: Add two unit tests for it. Reviewers: IslamAbdelRahman, yhchiang, anthony, kradhakrishnan, andrewkr Reviewed By: andrewkr Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D54921
64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// 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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#include <cstdlib>
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#include "db/db_test_util.h"
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#include "port/stack_trace.h"
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namespace rocksdb {
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class DBTest2 : public DBTestBase {
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public:
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DBTest2() : DBTestBase("/db_test2") {}
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};
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TEST_F(DBTest2, IteratorPropertyVersionNumber) {
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Put("", "");
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Iterator* iter1 = db_->NewIterator(ReadOptions());
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std::string prop_value;
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ASSERT_OK(iter1->GetProperty("rocksdb.iterator.version-number", &prop_value));
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uint64_t version_number1 =
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static_cast<uint64_t>(std::atoi(prop_value.c_str()));
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Put("", "");
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Flush();
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Iterator* iter2 = db_->NewIterator(ReadOptions());
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ASSERT_OK(iter2->GetProperty("rocksdb.iterator.version-number", &prop_value));
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uint64_t version_number2 =
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static_cast<uint64_t>(std::atoi(prop_value.c_str()));
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ASSERT_GT(version_number2, version_number1);
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Put("", "");
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Iterator* iter3 = db_->NewIterator(ReadOptions());
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ASSERT_OK(iter3->GetProperty("rocksdb.iterator.version-number", &prop_value));
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uint64_t version_number3 =
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static_cast<uint64_t>(std::atoi(prop_value.c_str()));
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ASSERT_EQ(version_number2, version_number3);
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iter1->SeekToFirst();
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ASSERT_OK(iter1->GetProperty("rocksdb.iterator.version-number", &prop_value));
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uint64_t version_number1_new =
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static_cast<uint64_t>(std::atoi(prop_value.c_str()));
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ASSERT_EQ(version_number1, version_number1_new);
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delete iter1;
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delete iter2;
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delete iter3;
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}
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} // namespace rocksdb
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int main(int argc, char** argv) {
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rocksdb::port::InstallStackTraceHandler();
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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