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65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package datanode
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import (
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"sync"
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)
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// Cache stores flushing segments' ids to prevent flushing the same segment again and again.
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//
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// Once a segment is flushed, its id will be removed from the cache.
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//
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// A segment not in cache will be added into the cache when `FlushSegments` is called.
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// After the flush procedure, whether the segment successfully flushed or not,
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// it'll be removed from the cache. So if flush failed, the secondary flush can be triggered.
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type Cache struct {
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cacheMap sync.Map
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}
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// newCache returns a new Cache
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func newCache() *Cache {
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return &Cache{
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cacheMap: sync.Map{},
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}
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}
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// checkIfCached returns whether unique id is in cache
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func (c *Cache) checkIfCached(key UniqueID) bool {
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_, ok := c.cacheMap.Load(key)
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return ok
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}
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// Cache caches a specific ID into the cache
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func (c *Cache) Cache(ID UniqueID) {
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c.cacheMap.Store(ID, struct{}{})
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}
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// checkOrCache returns true if `key` is present.
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// Otherwise, it returns false and stores `key` into cache.
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func (c *Cache) checkOrCache(key UniqueID) bool {
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_, exist := c.cacheMap.LoadOrStore(key, struct{}{})
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return exist
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}
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// Remove removes a set of IDs from the cache
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func (c *Cache) Remove(IDs ...UniqueID) {
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for _, id := range IDs {
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c.cacheMap.Delete(id)
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}
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}
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