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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/testkit/testapp.h>
#include <vespa/vespalib/util/generationhandler.h>
#include <deque>
namespace vespalib {
typedef GenerationHandler::Guard GenGuard;
class Test : public vespalib::TestApp {
private:
void requireThatGenerationCanBeIncreased();
void requireThatReadersCanTakeGuards();
void requireThatGuardsCanBeCopied();
void requireThatTheFirstUsedGenerationIsCorrect();
void requireThatGenerationCanGrowLarge();
public:
int Main() override;
};
void
Test::requireThatGenerationCanBeIncreased()
{
GenerationHandler gh;
EXPECT_EQUAL(0u, gh.getCurrentGeneration());
EXPECT_EQUAL(0u, gh.getFirstUsedGeneration());
gh.incGeneration();
EXPECT_EQUAL(1u, gh.getCurrentGeneration());
EXPECT_EQUAL(1u, gh.getFirstUsedGeneration());
}
void
Test::requireThatReadersCanTakeGuards()
{
GenerationHandler gh;
EXPECT_EQUAL(0u, gh.getGenerationRefCount(0));
{
GenGuard g1 = gh.takeGuard();
EXPECT_EQUAL(1u, gh.getGenerationRefCount(0));
{
GenGuard g2 = gh.takeGuard();
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
gh.incGeneration();
{
GenGuard g3 = gh.takeGuard();
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(1u, gh.getGenerationRefCount(1));
EXPECT_EQUAL(3u, gh.getGenerationRefCount());
}
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(1));
gh.incGeneration();
{
GenGuard g3 = gh.takeGuard();
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(1));
EXPECT_EQUAL(1u, gh.getGenerationRefCount(2));
}
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(1));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(2));
}
EXPECT_EQUAL(1u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(1));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(2));
}
EXPECT_EQUAL(0u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(1));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(2));
}
void
Test::requireThatGuardsCanBeCopied()
{
GenerationHandler gh;
GenGuard g1 = gh.takeGuard();
EXPECT_EQUAL(1u, gh.getGenerationRefCount(0));
GenGuard g2(g1);
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
gh.incGeneration();
GenGuard g3 = gh.takeGuard();
EXPECT_EQUAL(2u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(1u, gh.getGenerationRefCount(1));
g3 = g2;
EXPECT_EQUAL(3u, gh.getGenerationRefCount(0));
EXPECT_EQUAL(0u, gh.getGenerationRefCount(1));
}
void
Test::requireThatTheFirstUsedGenerationIsCorrect()
{
GenerationHandler gh;
EXPECT_EQUAL(0u, gh.getFirstUsedGeneration());
gh.incGeneration();
EXPECT_EQUAL(1u, gh.getFirstUsedGeneration());
{
GenGuard g1 = gh.takeGuard();
gh.incGeneration();
EXPECT_EQUAL(1u, gh.getGenerationRefCount());
EXPECT_EQUAL(1u, gh.getFirstUsedGeneration());
}
EXPECT_EQUAL(1u, gh.getFirstUsedGeneration());
gh.updateFirstUsedGeneration(); // Only writer should call this
EXPECT_EQUAL(0u, gh.getGenerationRefCount());
EXPECT_EQUAL(2u, gh.getFirstUsedGeneration());
{
GenGuard g1 = gh.takeGuard();
gh.incGeneration();
gh.incGeneration();
EXPECT_EQUAL(1u, gh.getGenerationRefCount());
EXPECT_EQUAL(2u, gh.getFirstUsedGeneration());
{
GenGuard g2 = gh.takeGuard();
EXPECT_EQUAL(2u, gh.getFirstUsedGeneration());
}
}
EXPECT_EQUAL(2u, gh.getFirstUsedGeneration());
gh.updateFirstUsedGeneration(); // Only writer should call this
EXPECT_EQUAL(0u, gh.getGenerationRefCount());
EXPECT_EQUAL(4u, gh.getFirstUsedGeneration());
}
void
Test::requireThatGenerationCanGrowLarge()
{
GenerationHandler gh;
std::deque<GenGuard> guards;
for (size_t i = 0; i < 10000; ++i) {
EXPECT_EQUAL(i, gh.getCurrentGeneration());
guards.push_back(gh.takeGuard()); // take guard on current generation
if (i >= 128) {
EXPECT_EQUAL(i - 128, gh.getFirstUsedGeneration());
guards.pop_front();
EXPECT_EQUAL(128u, gh.getGenerationRefCount());
}
gh.incGeneration();
}
}
int
Test::Main()
{
TEST_INIT("generationhandler_test");
TEST_DO(requireThatGenerationCanBeIncreased());
TEST_DO(requireThatReadersCanTakeGuards());
TEST_DO(requireThatGuardsCanBeCopied());
TEST_DO(requireThatTheFirstUsedGenerationIsCorrect());
TEST_DO(requireThatGenerationCanGrowLarge());
TEST_DONE();
}
}
TEST_APPHOOK(vespalib::Test);
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