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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc | |
parent | Initial commit. (diff) | |
download | ceph-upstream/18.2.2.tar.xz ceph-upstream/18.2.2.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc')
-rw-r--r-- | src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc b/src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc new file mode 100644 index 000000000..e50ace5a9 --- /dev/null +++ b/src/rocksdb/utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc @@ -0,0 +1,222 @@ +/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ +// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4: +#ifndef ROCKSDB_LITE +#ifndef OS_WIN +#ident "$Id$" +/*====== +This file is part of PerconaFT. + + +Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved. + + PerconaFT is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License, version 2, + as published by the Free Software Foundation. + + PerconaFT 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 PerconaFT. If not, see <http://www.gnu.org/licenses/>. + +---------------------------------------- + + PerconaFT is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License, version 3, + as published by the Free Software Foundation. + + PerconaFT 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 Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with PerconaFT. If not, see <http://www.gnu.org/licenses/>. + +---------------------------------------- + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +======= */ + +#ident \ + "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved." + +#include "keyrange.h" + +#include "../util/dbt.h" + +namespace toku { + +// create a keyrange by borrowing the left and right dbt +// pointers. no memory is copied. no checks for infinity needed. +void keyrange::create(const DBT *left, const DBT *right) { + init_empty(); + m_left_key = left; + m_right_key = right; +} + +// destroy the key copies. if they were never set, then destroy does nothing. +void keyrange::destroy(void) { + toku_destroy_dbt(&m_left_key_copy); + toku_destroy_dbt(&m_right_key_copy); +} + +// create a keyrange by copying the keys from the given range. +void keyrange::create_copy(const keyrange &range) { + // start with an initialized, empty range + init_empty(); + + // optimize the case where the left and right keys are the same. + // we'd like to only have one copy of the data. + if (toku_dbt_equals(range.get_left_key(), range.get_right_key())) { + set_both_keys(range.get_left_key()); + } else { + // replace our empty left and right keys with + // copies of the range's left and right keys + replace_left_key(range.get_left_key()); + replace_right_key(range.get_right_key()); + } +} + +// extend this keyrange by choosing the leftmost and rightmost +// endpoints between this range and the given. replaced keys +// in this range are freed and inherited keys are copied. +void keyrange::extend(const comparator &cmp, const keyrange &range) { + const DBT *range_left = range.get_left_key(); + const DBT *range_right = range.get_right_key(); + if (cmp(range_left, get_left_key()) < 0) { + replace_left_key(range_left); + } + if (cmp(range_right, get_right_key()) > 0) { + replace_right_key(range_right); + } +} + +// how much memory does this keyrange take? +// - the size of the left and right keys +// --- ignore the fact that we may have optimized the point case. +// it complicates things for little gain. +// - the size of the keyrange class itself +uint64_t keyrange::get_memory_size(void) const { + const DBT *left_key = get_left_key(); + const DBT *right_key = get_right_key(); + return left_key->size + right_key->size + sizeof(keyrange); +} + +// compare ranges. +keyrange::comparison keyrange::compare(const comparator &cmp, + const keyrange &range) const { + if (cmp(get_right_key(), range.get_left_key()) < 0) { + return comparison::LESS_THAN; + } else if (cmp(get_left_key(), range.get_right_key()) > 0) { + return comparison::GREATER_THAN; + } else if (cmp(get_left_key(), range.get_left_key()) == 0 && + cmp(get_right_key(), range.get_right_key()) == 0) { + return comparison::EQUALS; + } else { + return comparison::OVERLAPS; + } +} + +bool keyrange::overlaps(const comparator &cmp, const keyrange &range) const { + // equality is a stronger form of overlapping. + // so two ranges "overlap" if they're either equal or just overlapping. + comparison c = compare(cmp, range); + return c == comparison::EQUALS || c == comparison::OVERLAPS; +} + +keyrange keyrange::get_infinite_range(void) { + keyrange range; + range.create(toku_dbt_negative_infinity(), toku_dbt_positive_infinity()); + return range; +} + +void keyrange::init_empty(void) { + m_left_key = nullptr; + m_right_key = nullptr; + toku_init_dbt(&m_left_key_copy); + toku_init_dbt(&m_right_key_copy); + m_point_range = false; +} + +const DBT *keyrange::get_left_key(void) const { + if (m_left_key) { + return m_left_key; + } else { + return &m_left_key_copy; + } +} + +const DBT *keyrange::get_right_key(void) const { + if (m_right_key) { + return m_right_key; + } else { + return &m_right_key_copy; + } +} + +// copy the given once and set both the left and right pointers. +// optimization for point ranges, so the left and right ranges +// are not copied twice. +void keyrange::set_both_keys(const DBT *key) { + if (toku_dbt_is_infinite(key)) { + m_left_key = key; + m_right_key = key; + } else { + toku_clone_dbt(&m_left_key_copy, *key); + toku_copyref_dbt(&m_right_key_copy, m_left_key_copy); + } + m_point_range = true; +} + +// destroy the current left key. set and possibly copy the new one +void keyrange::replace_left_key(const DBT *key) { + // a little magic: + // + // if this is a point range, then the left and right keys share + // one copy of the data, and it lives in the left key copy. so + // if we're replacing the left key, move the real data to the + // right key copy instead of destroying it. now, the memory is + // owned by the right key and the left key may be replaced. + if (m_point_range) { + m_right_key_copy = m_left_key_copy; + } else { + toku_destroy_dbt(&m_left_key_copy); + } + + if (toku_dbt_is_infinite(key)) { + m_left_key = key; + } else { + toku_clone_dbt(&m_left_key_copy, *key); + m_left_key = nullptr; + } + m_point_range = false; +} + +// destroy the current right key. set and possibly copy the new one +void keyrange::replace_right_key(const DBT *key) { + toku_destroy_dbt(&m_right_key_copy); + if (toku_dbt_is_infinite(key)) { + m_right_key = key; + } else { + toku_clone_dbt(&m_right_key_copy, *key); + m_right_key = nullptr; + } + m_point_range = false; +} + +} /* namespace toku */ +#endif // OS_WIN +#endif // ROCKSDB_LITE |