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+/**
+ * Copyright (C) 2022-present MongoDB, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the Server Side Public License, version 1,
+ * as published by MongoDB, Inc.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * Server Side Public License for more details.
+ *
+ * You should have received a copy of the Server Side Public License
+ * along with this program. If not, see
+ * <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ * As a special exception, the copyright holders give permission to link the
+ * code of portions of this program with the OpenSSL library under certain
+ * conditions as described in each individual source file and distribute
+ * linked combinations including the program with the OpenSSL library. You
+ * must comply with the Server Side Public License in all respects for
+ * all of the code used other than as permitted herein. If you modify file(s)
+ * with this exception, you may extend this exception to your version of the
+ * file(s), but you are not obligated to do so. If you do not wish to do so,
+ * delete this exception statement from your version. If you delete this
+ * exception statement from all source files in the program, then also delete
+ * it in the license file.
+ */
+
+#include <string>
+
+#include "mongo/db/client.h"
+#include "mongo/db/concurrency/locker_noop_service_context_test_fixture.h"
+#include "mongo/db/operation_context.h"
+#include "mongo/db/query/stats/stats_cache.h"
+#include "mongo/db/query/stats/stats_cache_loader_mock.h"
+#include "mongo/unittest/barrier.h"
+#include "mongo/unittest/unittest.h"
+#include "mongo/util/concurrency/thread_pool.h"
+#include "mongo/util/read_through_cache.h"
+#include "mongo/util/scopeguard.h"
+
+#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault
+
+namespace mongo::stats {
+namespace {
+
+using unittest::assertGet;
+
+/**
+ * Fixture for tests, which do not need to exercise the multi-threading capabilities of the cache
+ * and as such do not require control over the creation/destruction of their operation contexts.
+ */
+class StatsCacheTest : public LockerNoopServiceContextTest {
+protected:
+ // Extends StatsCache and automatically provides it with a thread pool, which will be
+ // shutdown and joined before the StatsCache is destroyed (which is part of the contract of
+ // ReadThroughCache)
+ class CacheWithThreadPool : public StatsCache {
+ public:
+ CacheWithThreadPool(ServiceContext* service,
+ std::unique_ptr<StatsCacheLoader> cacheLoaderMock,
+ size_t size)
+ : StatsCache(service, std::move(cacheLoaderMock), _threadPool, size) {
+ _threadPool.startup();
+ }
+
+ private:
+ ThreadPool _threadPool{[] {
+ ThreadPool::Options options;
+ options.poolName = "StatsCacheTest";
+ options.minThreads = 1;
+ options.maxThreads = 1;
+ return options;
+ }()};
+ };
+
+ const ServiceContext::UniqueOperationContext _opCtxHolder{makeOperationContext()};
+ OperationContext* const _opCtx{_opCtxHolder.get()};
+};
+
+TEST(StatsCacheTest, StandaloneValueHandle) {
+ StatsCacheVal statsPtr(new ArrayHistogram());
+ StatsCache::ValueHandle standaloneHandle(std::move(statsPtr));
+ ASSERT(standaloneHandle.isValid());
+}
+
+TEST_F(StatsCacheTest, KeyDoesNotExist) {
+ Status namespaceNotFoundErrorStatus = {ErrorCodes::NamespaceNotFound,
+ "The key does not exists"};
+ auto cacheLoaderMock = std::make_unique<StatsCacheLoaderMock>();
+ auto cache = CacheWithThreadPool(getServiceContext(), std::move(cacheLoaderMock), 1);
+ cache.getStatsCacheLoader()->setStatsReturnValueForTest(
+ std::move(namespaceNotFoundErrorStatus));
+ auto handle = cache.acquire(_opCtx, std::make_pair(NamespaceString("db", "coll"), "somePath"));
+ ASSERT(!handle);
+}
+
+/*
+TEST_F(StatsCacheTest, LoadStats) {
+ auto cacheLoaderMock = std::make_unique<StatsCacheLoaderMock>();
+ auto cache = CacheWithThreadPool(getServiceContext(), std::move(cacheLoaderMock), 1);
+
+ auto stats1 = CollectionStatistics(1);
+ auto stats2 = CollectionStatistics(2);
+
+ cache.getStatsCacheLoader()->setStatsReturnValueForTest(std::move(stats1));
+
+ auto handle = cache.acquire(_opCtx, NamespaceString("db", "coll1"));
+ ASSERT(handle.isValid());
+ ASSERT_EQ(1, handle->getCardinality());
+
+ // Make all requests to StatsCacheLoader to throw an exception to ensre that test returns value
+ // from cache.
+ Status internalErrorStatus = {ErrorCodes::InternalError,
+ "Stats cache loader received unexpected request"};
+ cache.getStatsCacheLoader()->setStatsReturnValueForTest(std::move(internalErrorStatus));
+
+ handle = cache.acquire(_opCtx, NamespaceString("db", "coll1"));
+ ASSERT(handle.isValid());
+ ASSERT_EQ(1, handle->getCardinality());
+
+ cache.getStatsCacheLoader()->setStatsReturnValueForTest(std::move(stats2));
+ handle = cache.acquire(_opCtx, NamespaceString("db", "coll2"));
+ ASSERT(handle.isValid());
+ ASSERT_EQ(2, handle->getCardinality());
+}
+*/
+
+} // namespace
+} // namespace mongo::stats