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84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package timeline
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import (
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"container/list"
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)
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func (t *timeline) Prune(desiredPreparedItemsLength int, desiredIndexedItemsLength int) int {
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t.Lock()
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defer t.Unlock()
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l := t.items.data
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if l == nil {
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// Nothing to prune.
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return 0
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}
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var (
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position int
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totalPruned int
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toRemove *[]*list.Element
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)
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// Only initialize toRemove if we know we're
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// going to need it, otherwise skiperino.
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if toRemoveLen := t.items.data.Len() - desiredIndexedItemsLength; toRemoveLen > 0 {
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toRemove = func() *[]*list.Element { tr := make([]*list.Element, 0, toRemoveLen); return &tr }()
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}
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// Work from the front of the list until we get
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// to the point where we need to start pruning.
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for e := l.Front(); e != nil; e = e.Next() {
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position++
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if position <= desiredPreparedItemsLength {
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// We're still within our allotted
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// prepped length, nothing to do yet.
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continue
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}
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// We need to *at least* unprepare this entry.
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// If we're beyond our indexed length already,
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// we can just remove the item completely.
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if position > desiredIndexedItemsLength {
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*toRemove = append(*toRemove, e)
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totalPruned++
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continue
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}
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entry := e.Value.(*indexedItemsEntry)
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if entry.prepared == nil {
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// It's already unprepared (mood).
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continue
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}
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entry.prepared = nil // <- eat this up please garbage collector nom nom nom
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totalPruned++
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}
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if toRemove != nil {
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for _, e := range *toRemove {
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l.Remove(e)
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}
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}
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return totalPruned
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}
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