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118 lines
2.5 KiB
Go
118 lines
2.5 KiB
Go
// Copyright (c) 2023 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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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 store
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import (
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"errors"
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"fmt"
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"sync"
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)
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// ErrBatchFull indicates that the batch is full
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var ErrBatchFull = errors.New("batch is full")
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type key interface {
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string | int | int64
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}
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// Batch represents an ordered batch
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type Batch[K key, T any] struct {
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keys []K
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items map[K]T
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limit uint32
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sync.Mutex
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}
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// Add adds the item to the batch
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func (b *Batch[K, T]) Add(key K, item T) error {
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b.Lock()
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defer b.Unlock()
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if b.isFull() {
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return ErrBatchFull
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}
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if _, ok := b.items[key]; !ok {
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b.keys = append(b.keys, key)
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}
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b.items[key] = item
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return nil
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}
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// GetAll fetches the items and resets the batch
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// Returned items are not referenced by the batch
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func (b *Batch[K, T]) GetAll() (orderedKeys []K, orderedItems []T, err error) {
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b.Lock()
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defer b.Unlock()
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orderedKeys = append([]K(nil), b.keys...)
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for _, key := range orderedKeys {
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item, ok := b.items[key]
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if !ok {
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err = fmt.Errorf("item not found for the key: %v; should not happen;", key)
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return
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}
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orderedItems = append(orderedItems, item)
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delete(b.items, key)
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}
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b.keys = b.keys[:0]
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return
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}
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// GetByKey will get the batch item by the provided key
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func (b *Batch[K, T]) GetByKey(key K) (T, bool) {
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b.Lock()
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defer b.Unlock()
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item, ok := b.items[key]
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return item, ok
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}
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// Len returns the no of items in the batch
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func (b *Batch[K, T]) Len() int {
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b.Lock()
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defer b.Unlock()
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return len(b.keys)
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}
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// IsFull checks if the batch is full or not
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func (b *Batch[K, T]) IsFull() bool {
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b.Lock()
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defer b.Unlock()
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return b.isFull()
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}
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func (b *Batch[K, T]) isFull() bool {
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return len(b.items) >= int(b.limit)
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}
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// NewBatch creates a new batch
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func NewBatch[K key, T any](limit uint32) *Batch[K, T] {
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return &Batch[K, T]{
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keys: make([]K, 0, limit),
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items: make(map[K]T, limit),
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limit: limit,
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}
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}
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