mirror of
https://gitee.com/milvus-io/milvus.git
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90 lines
2.1 KiB
Go
90 lines
2.1 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 datacoord
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import (
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"context"
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"errors"
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"fmt"
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"sync"
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"github.com/milvus-io/milvus/internal/types"
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)
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var errDisposed = errors.New("client is disposed")
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// NodeInfo contains node base info
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type NodeInfo struct {
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NodeID int64
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Address string
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}
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// Session contains session info of a node
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type Session struct {
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sync.Mutex
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info *NodeInfo
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client types.DataNode
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clientCreator dataNodeCreatorFunc
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isDisposed bool
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}
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// NewSession create a new session
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func NewSession(info *NodeInfo, creator dataNodeCreatorFunc) *Session {
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return &Session{
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info: info,
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clientCreator: creator,
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}
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}
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// GetOrCreateClient gets or creates a new client for session
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func (n *Session) GetOrCreateClient(ctx context.Context) (types.DataNode, error) {
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n.Lock()
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defer n.Unlock()
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if n.isDisposed {
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return nil, errDisposed
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}
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if n.client != nil {
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return n.client, nil
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}
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if n.clientCreator == nil {
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return nil, fmt.Errorf("unable to create client for %s beacause of a nil client creator", n.info.Address)
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}
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err := n.initClient(ctx)
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return n.client, err
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}
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func (n *Session) initClient(ctx context.Context) (err error) {
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if n.client, err = n.clientCreator(ctx, n.info.Address); err != nil {
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return
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}
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if err = n.client.Init(); err != nil {
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return
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}
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return n.client.Start()
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}
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// Dispose release client connection
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func (n *Session) Dispose() {
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n.Lock()
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defer n.Unlock()
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if n.client != nil {
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n.client.Stop()
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n.client = nil
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}
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n.isDisposed = true
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}
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