milvus/internal/allocator/global_id_allocator.go

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// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package allocator
import (
"github.com/milvus-io/milvus/internal/kv"
"github.com/milvus-io/milvus/internal/tso"
"github.com/milvus-io/milvus/internal/util/typeutil"
)
// GlobalIDAllocator is the global single point TSO allocator.
type GlobalIDAllocator struct {
allocator tso.Allocator
}
// NewGlobalIDAllocator creates GlobalIDAllocator for allocates ID.
func NewGlobalIDAllocator(key string, base kv.TxnKV) *GlobalIDAllocator {
allocator := tso.NewGlobalTSOAllocator(key, base)
allocator.SetLimitMaxLogic(false)
return &GlobalIDAllocator{
allocator: allocator,
}
}
// Initialize will initialize the created global TSO allocator.
func (gia *GlobalIDAllocator) Initialize() error {
return gia.allocator.Initialize()
}
// Alloc allocates the id of the count number.
// GenerateTSO is used to generate a given number of TSOs.
// Make sure you have initialized the TSO allocator before calling.
func (gia *GlobalIDAllocator) Alloc(count uint32) (typeutil.UniqueID, typeutil.UniqueID, error) {
timestamp, err := gia.allocator.GenerateTSO(count)
if err != nil {
return 0, 0, err
}
idEnd := typeutil.UniqueID(timestamp) + 1
idStart := idEnd - int64(count)
return idStart, idEnd, nil
}
// AllocOne allocates one id.
func (gia *GlobalIDAllocator) AllocOne() (typeutil.UniqueID, error) {
timestamp, err := gia.allocator.GenerateTSO(1)
if err != nil {
return 0, err
}
idStart := typeutil.UniqueID(timestamp)
return idStart, nil
}