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https://gitee.com/milvus-io/milvus.git
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76 lines
2.4 KiB
Go
76 lines
2.4 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 allocator
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import (
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"github.com/milvus-io/milvus/internal/kv"
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"github.com/milvus-io/milvus/internal/tso"
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"github.com/milvus-io/milvus/internal/util/typeutil"
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)
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// GIDAllocator is interface for GlobalIDAllocator.
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// Alloc allocates the id of the count number.
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// AllocOne allocates one id.
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// UpdateID update timestamp of allocator.
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type GIDAllocator interface {
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Alloc(count uint32) (UniqueID, UniqueID, error)
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AllocOne() (UniqueID, error)
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UpdateID() error
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}
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// GlobalIDAllocator is the global single point TSO allocator.
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type GlobalIDAllocator struct {
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allocator tso.Allocator
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}
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// NewGlobalIDAllocator creates GlobalIDAllocator for allocates ID.
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func NewGlobalIDAllocator(key string, base kv.TxnKV) *GlobalIDAllocator {
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allocator := tso.NewGlobalTSOAllocator(key, base)
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allocator.SetLimitMaxLogic(false)
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return &GlobalIDAllocator{
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allocator: allocator,
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}
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}
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// Initialize will initialize the created global TSO allocator.
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func (gia *GlobalIDAllocator) Initialize() error {
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return gia.allocator.Initialize()
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}
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// Alloc allocates the id of the count number.
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// GenerateTSO is used to generate a given number of TSOs.
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// Make sure you have initialized the TSO allocator before calling.
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func (gia *GlobalIDAllocator) Alloc(count uint32) (typeutil.UniqueID, typeutil.UniqueID, error) {
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timestamp, err := gia.allocator.GenerateTSO(count)
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if err != nil {
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return 0, 0, err
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}
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idEnd := typeutil.UniqueID(timestamp) + 1
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idStart := idEnd - int64(count)
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return idStart, idEnd, nil
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}
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// AllocOne allocates one id.
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func (gia *GlobalIDAllocator) AllocOne() (typeutil.UniqueID, error) {
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timestamp, err := gia.allocator.GenerateTSO(1)
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if err != nil {
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return 0, err
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}
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idStart := typeutil.UniqueID(timestamp)
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return idStart, nil
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}
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// UpdateID update timestamp of allocator.
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func (gia *GlobalIDAllocator) UpdateID() error {
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return gia.allocator.UpdateTSO()
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}
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