80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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 tsdb
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import (
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"container/list"
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"sync"
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"github.com/prometheus/prometheus/tsdb/chunks"
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)
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type oooIsolation struct {
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mtx sync.RWMutex
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openReads *list.List
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}
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type oooIsolationState struct {
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i *oooIsolation
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e *list.Element
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minRef chunks.ChunkDiskMapperRef
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}
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func newOOOIsolation() *oooIsolation {
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return &oooIsolation{
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openReads: list.New(),
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}
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}
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// HasOpenReadsAtOrBefore returns true if this oooIsolation is aware of any reads that use
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// chunks with reference at or before ref.
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func (i *oooIsolation) HasOpenReadsAtOrBefore(ref chunks.ChunkDiskMapperRef) bool {
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i.mtx.RLock()
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defer i.mtx.RUnlock()
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for e := i.openReads.Front(); e != nil; e = e.Next() {
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s := e.Value.(*oooIsolationState)
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if ref.GreaterThan(s.minRef) {
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return true
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}
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}
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return false
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}
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// TrackReadAfter records a read that uses chunks with reference after minRef.
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//
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// The caller must ensure that the returned oooIsolationState is eventually closed when
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// the read is complete.
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func (i *oooIsolation) TrackReadAfter(minRef chunks.ChunkDiskMapperRef) *oooIsolationState {
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s := &oooIsolationState{
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i: i,
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minRef: minRef,
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}
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i.mtx.Lock()
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s.e = i.openReads.PushBack(s)
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i.mtx.Unlock()
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return s
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}
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func (s oooIsolationState) Close() {
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s.i.mtx.Lock()
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s.i.openReads.Remove(s.e)
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s.i.mtx.Unlock()
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}
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