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81 lines
2.0 KiB
Go
81 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 rootcoord
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import (
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"sync"
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"go.uber.org/atomic"
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"github.com/milvus-io/milvus/internal/tso"
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)
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type DdlTsLockManager interface {
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GetMinDdlTs() Timestamp
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AddRefCnt(delta int32)
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Lock()
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Unlock()
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UpdateLastTs(ts Timestamp)
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}
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type ddlTsLockManager struct {
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lastTs atomic.Uint64
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inProgressCnt atomic.Int32
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tsoAllocator tso.Allocator
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mu sync.Mutex
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}
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func (c *ddlTsLockManager) GetMinDdlTs() Timestamp {
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// In fact, `TryLock` can replace the `inProgressCnt` but it's not recommended.
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if c.inProgressCnt.Load() > 0 {
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return c.lastTs.Load()
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}
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c.Lock()
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defer c.Unlock()
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ts, err := c.tsoAllocator.GenerateTSO(1)
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if err != nil {
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return c.lastTs.Load()
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}
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c.UpdateLastTs(ts)
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return ts
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}
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func (c *ddlTsLockManager) AddRefCnt(delta int32) {
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c.inProgressCnt.Add(delta)
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}
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func (c *ddlTsLockManager) Lock() {
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c.mu.Lock()
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}
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func (c *ddlTsLockManager) Unlock() {
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c.mu.Unlock()
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}
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func (c *ddlTsLockManager) UpdateLastTs(ts Timestamp) {
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c.lastTs.Store(ts)
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}
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func newDdlTsLockManager(tsoAllocator tso.Allocator) *ddlTsLockManager {
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return &ddlTsLockManager{
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lastTs: *atomic.NewUint64(0),
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inProgressCnt: *atomic.NewInt32(0),
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tsoAllocator: tsoAllocator,
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mu: sync.Mutex{},
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}
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}
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