thin-provisioning-tools/unit-tests/btree_t.cc

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// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools 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
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
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#include "transaction_manager.h"
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#include "space_map_core.h"
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#include "btree.h"
#define BOOST_TEST_MODULE BTreeTests
#include <boost/test/included/unit_test.hpp>
using namespace std;
using namespace boost;
using namespace persistent_data;
//----------------------------------------------------------------
namespace {
block_address const NR_BLOCKS = 102400;
transaction_manager::ptr
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create_tm() {
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block_manager<>::ptr bm(new block_manager<>("./test.data", NR_BLOCKS, 4, true));
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space_map::ptr sm(new core_map(NR_BLOCKS));
transaction_manager::ptr tm(new transaction_manager(bm, sm));
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return tm;
}
btree<1, uint64_traits>::ptr
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create_btree() {
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uint64_traits::ref_counter rc;
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return btree<1, uint64_traits>::ptr(
new btree<1, uint64_traits>(create_tm(), rc));
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}
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// Checks that a btree is well formed.
//
// i) No block should be in the tree more than once.
//
class constraint_visitor : public btree<1, uint64_traits>::visitor {
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public:
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typedef btree_detail::node_ref<uint64_traits> internal_node;
typedef btree_detail::node_ref<uint64_traits> leaf_node;
bool visit_internal(unsigned level, bool sub_root,
boost::optional<uint64_t> key,
internal_node const &n) {
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check_duplicate_block(n.get_location());
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return true;
}
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bool visit_internal_leaf(unsigned level, bool sub_root,
boost::optional<uint64_t> key,
internal_node const &n) {
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check_duplicate_block(n.get_location());
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return true;
}
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bool visit_leaf(unsigned level, bool sub_root,
boost::optional<uint64_t> key,
leaf_node const &n) {
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check_duplicate_block(n.get_location());
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return true;
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}
private:
void check_duplicate_block(block_address b) {
if (seen_.count(b)) {
ostringstream out;
out << "duplicate block in btree: " << b;
throw runtime_error(out.str());
}
seen_.insert(b);
}
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set<block_address> seen_;
};
void check_constraints(btree<1, uint64_traits>::ptr tree) {
typedef btree<1, uint64_traits> tree_type;
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tree_type::visitor::ptr v(new constraint_visitor);
tree->visit(v);
}
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}
//----------------------------------------------------------------
BOOST_AUTO_TEST_CASE(empty_btree_contains_nothing)
{
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btree<1, uint64_traits>::ptr tree = create_btree();
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check_constraints(tree);
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for (uint64_t i = 0; i < 1000; i++) {
uint64_t key[1] = {i};
BOOST_CHECK(!tree->lookup(key));
}
}
BOOST_AUTO_TEST_CASE(insert_works)
{
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unsigned const COUNT = 100000;
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btree<1, uint64_traits>::ptr tree = create_btree();
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for (uint64_t i = 0; i < COUNT; i++) {
uint64_t key[1] = {i * 7};
uint64_t value = i;
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tree->insert(key, value);
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btree<1, uint64_traits>::maybe_value l = tree->lookup(key);
BOOST_REQUIRE(l);
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BOOST_CHECK_EQUAL(*l, i);
}
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check_constraints(tree);
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}
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BOOST_AUTO_TEST_CASE(insert_does_not_insert_imaginary_values)
{
btree<1, uint64_traits>::ptr tree = create_btree();
uint64_t key[1] = {0};
uint64_t value = 100;
btree<1, uint64_traits>::maybe_value l = tree->lookup(key);
BOOST_CHECK(!l);
key[0] = 1;
l = tree->lookup(key);
BOOST_CHECK(!l);
key[0] = 0;
tree->insert(key, value);
l = tree->lookup(key);
BOOST_REQUIRE(l);
BOOST_CHECK_EQUAL(*l, 100);
key[0] = 1;
l = tree->lookup(key);
BOOST_CHECK(!l);
check_constraints(tree);
}
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//----------------------------------------------------------------