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/**
* Copyright (C) 2019-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 "mongo/platform/basic.h"
#include <string>
#include "mongo/db/service_context_test_fixture.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/dist_cache.h"
namespace mongo {
namespace {
struct CachedValue {
const int counter;
};
class Cache : public DistCache<std::string, CachedValue> {
public:
Cache(size_t size, LookupFn lookupFn)
: DistCache(size, _mutex), _lookupFn(std::move(lookupFn)) {}
private:
boost::optional<CachedValue> lookup(OperationContext* opCtx, const std::string& key) override {
return _lookupFn(opCtx, key);
}
Mutex _mutex = MONGO_MAKE_LATCH("DistCacheTest::Cache");
LookupFn _lookupFn;
};
class DistCacheTest : public ServiceContextTest {
protected:
const ServiceContext::UniqueOperationContext _opCtxHolder{makeOperationContext()};
OperationContext* _opCtx{_opCtxHolder.get()};
};
TEST_F(DistCacheTest, FetchInvalidateAndRefetch) {
int countLookups = 0;
Cache cache(1, [&](OperationContext*, const std::string& key) {
ASSERT_EQ("TestKey", key);
countLookups++;
return CachedValue{100 * countLookups};
});
for (int i = 1; i <= 3; i++) {
auto value = cache.acquire(_opCtx, "TestKey");
ASSERT(value);
ASSERT_EQ(100 * i, value->counter);
ASSERT_EQ(i, countLookups);
ASSERT(cache.acquire(_opCtx, "TestKey"));
ASSERT_EQ(i, countLookups);
cache.invalidate("TestKey");
}
}
TEST_F(DistCacheTest, CacheSizeZero) {
int countLookups = 0;
Cache cache(0, [&](OperationContext*, const std::string& key) {
ASSERT_EQ("TestKey", key);
countLookups++;
return CachedValue{100 * countLookups};
});
for (int i = 1; i <= 3; i++) {
auto value = cache.acquire(_opCtx, "TestKey");
ASSERT(value);
ASSERT_EQ(100 * i, value->counter);
ASSERT_EQ(i, countLookups);
}
}
} // namespace
} // namespace mongo
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