mirror of
https://gitee.com/milvus-io/milvus.git
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52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and 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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// 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 segment ID into the cache
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func (c *Cache) Cache(segID UniqueID) {
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c.cacheMap.Store(segID, struct{}{})
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}
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// Remove removes a set of segment IDs from the cache
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func (c *Cache) Remove(segIDs ...UniqueID) {
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for _, id := range segIDs {
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c.cacheMap.Delete(id)
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}
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}
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