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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/gtest/gtest.h>
#include <vespa/vespalib/util/generationhandler.h>
#include <deque>
namespace vespalib {
using GenGuard = GenerationHandler::Guard;
class GenerationHandlerTest : public ::testing::Test {
protected:
GenerationHandler gh;
GenerationHandlerTest();
~GenerationHandlerTest() override;
};
GenerationHandlerTest::GenerationHandlerTest()
: ::testing::Test(),
gh()
{
}
GenerationHandlerTest::~GenerationHandlerTest() = default;
TEST_F(GenerationHandlerTest, require_that_generation_can_be_increased)
{
EXPECT_EQ(0u, gh.getCurrentGeneration());
EXPECT_EQ(0u, gh.get_oldest_used_generation());
gh.incGeneration();
EXPECT_EQ(1u, gh.getCurrentGeneration());
EXPECT_EQ(1u, gh.get_oldest_used_generation());
}
TEST_F(GenerationHandlerTest, require_that_readers_can_take_guards)
{
EXPECT_EQ(0u, gh.getGenerationRefCount(0));
{
GenGuard g1 = gh.takeGuard();
EXPECT_EQ(1u, gh.getGenerationRefCount(0));
{
GenGuard g2 = gh.takeGuard();
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
gh.incGeneration();
{
GenGuard g3 = gh.takeGuard();
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
EXPECT_EQ(1u, gh.getGenerationRefCount(1));
EXPECT_EQ(3u, gh.getGenerationRefCount());
}
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
EXPECT_EQ(0u, gh.getGenerationRefCount(1));
gh.incGeneration();
{
GenGuard g3 = gh.takeGuard();
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
EXPECT_EQ(0u, gh.getGenerationRefCount(1));
EXPECT_EQ(1u, gh.getGenerationRefCount(2));
}
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
EXPECT_EQ(0u, gh.getGenerationRefCount(1));
EXPECT_EQ(0u, gh.getGenerationRefCount(2));
}
EXPECT_EQ(1u, gh.getGenerationRefCount(0));
EXPECT_EQ(0u, gh.getGenerationRefCount(1));
EXPECT_EQ(0u, gh.getGenerationRefCount(2));
}
EXPECT_EQ(0u, gh.getGenerationRefCount(0));
EXPECT_EQ(0u, gh.getGenerationRefCount(1));
EXPECT_EQ(0u, gh.getGenerationRefCount(2));
}
TEST_F(GenerationHandlerTest, require_that_guards_can_be_copied)
{
GenGuard g1 = gh.takeGuard();
EXPECT_EQ(1u, gh.getGenerationRefCount(0));
GenGuard g2(g1);
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
gh.incGeneration();
GenGuard g3 = gh.takeGuard();
EXPECT_EQ(2u, gh.getGenerationRefCount(0));
EXPECT_EQ(1u, gh.getGenerationRefCount(1));
g3 = g2;
EXPECT_EQ(3u, gh.getGenerationRefCount(0));
EXPECT_EQ(0u, gh.getGenerationRefCount(1));
}
TEST_F(GenerationHandlerTest, require_that_the_first_used_generation_is_correct)
{
EXPECT_EQ(0u, gh.get_oldest_used_generation());
gh.incGeneration();
EXPECT_EQ(1u, gh.get_oldest_used_generation());
{
GenGuard g1 = gh.takeGuard();
gh.incGeneration();
EXPECT_EQ(1u, gh.getGenerationRefCount());
EXPECT_EQ(1u, gh.get_oldest_used_generation());
}
EXPECT_EQ(1u, gh.get_oldest_used_generation());
gh.update_oldest_used_generation(); // Only writer should call this
EXPECT_EQ(0u, gh.getGenerationRefCount());
EXPECT_EQ(2u, gh.get_oldest_used_generation());
{
GenGuard g1 = gh.takeGuard();
gh.incGeneration();
gh.incGeneration();
EXPECT_EQ(1u, gh.getGenerationRefCount());
EXPECT_EQ(2u, gh.get_oldest_used_generation());
{
GenGuard g2 = gh.takeGuard();
EXPECT_EQ(2u, gh.get_oldest_used_generation());
}
}
EXPECT_EQ(2u, gh.get_oldest_used_generation());
gh.update_oldest_used_generation(); // Only writer should call this
EXPECT_EQ(0u, gh.getGenerationRefCount());
EXPECT_EQ(4u, gh.get_oldest_used_generation());
}
TEST_F(GenerationHandlerTest, require_that_generation_can_grow_large)
{
std::deque<GenGuard> guards;
for (size_t i = 0; i < 10000; ++i) {
EXPECT_EQ(i, gh.getCurrentGeneration());
guards.push_back(gh.takeGuard()); // take guard on current generation
if (i >= 128) {
EXPECT_EQ(i - 128, gh.get_oldest_used_generation());
guards.pop_front();
EXPECT_EQ(128u, gh.getGenerationRefCount());
}
gh.incGeneration();
}
}
}
GTEST_MAIN_RUN_ALL_TESTS()
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