| // Copyright 2015 Cloudera, Inc. |
| // |
| // 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 <gtest/gtest.h> |
| #include <vector> |
| |
| #include "kudu/common/id_mapping.h" |
| #include "kudu/util/random.h" |
| #include "kudu/util/test_util.h" |
| |
| namespace kudu { |
| // Basic unit test for IdMapping. |
| TEST(TestIdMapping, TestSimple) { |
| IdMapping m; |
| ASSERT_EQ(-1, m.get(1)); |
| m.set(1, 10); |
| m.set(2, 20); |
| m.set(3, 30); |
| ASSERT_EQ(10, m.get(1)); |
| ASSERT_EQ(20, m.get(2)); |
| ASSERT_EQ(30, m.get(3)); |
| } |
| |
| // Insert enough entries in the mapping so that it is forced to rehash |
| // itself. |
| TEST(TestIdMapping, TestRehash) { |
| IdMapping m; |
| |
| for (int i = 0; i < 1000; i++) { |
| m.set(i, i * 10); |
| } |
| for (int i = 0; i < 1000; i++) { |
| ASSERT_EQ(i * 10, m.get(i)); |
| } |
| } |
| |
| // Generate a random sequence of keys. |
| TEST(TestIdMapping, TestRandom) { |
| Random r(SeedRandom()); |
| IdMapping m; |
| std::vector<int> picked; |
| for (int i = 0; i < 1000; i++) { |
| int32_t k = r.Next32(); |
| m.set(k, i); |
| picked.push_back(k); |
| } |
| |
| for (int i = 0; i < picked.size(); i++) { |
| ASSERT_EQ(i, m.get(picked[i])); |
| } |
| } |
| |
| // Regression test for a particular bad sequence of inserts |
| // that caused a crash on a previous implementation. |
| // |
| // The particular issue here is that we have many inserts |
| // which have the same key modulo the initial capacity. |
| TEST(TestIdMapping, TestBadSequence) { |
| IdMapping m; |
| m.set(0, 0); |
| m.set(4, 0); |
| m.set(128, 0); // 0 modulo 64 and 128 |
| m.set(129, 0); // 1 |
| m.set(130, 0); // 2 |
| m.set(131, 0); // 3 |
| } |
| |
| TEST(TestIdMapping, TestReinsert) { |
| IdMapping m; |
| m.set(0, 0); |
| ASSERT_DEATH({ |
| m.set(0, 1); |
| }, |
| "Cannot insert duplicate keys"); |
| } |
| |
| } // namespace kudu |