mirror of
https://gitee.com/milvus-io/milvus.git
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104 lines
2.7 KiB
Go
104 lines
2.7 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 flowgraph
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import (
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"context"
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"errors"
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"sync"
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)
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// TimeTickedFlowGraph flowgraph with input from tt msg stream
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type TimeTickedFlowGraph struct {
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nodeCtx map[NodeName]*nodeCtx
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stopOnce sync.Once
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startOnce sync.Once
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}
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// AddNode add Node into flowgraph
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func (fg *TimeTickedFlowGraph) AddNode(node Node) {
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nodeName := node.Name()
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nodeCtx := nodeCtx{
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node: node,
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downstreamInputChanIdx: make(map[string]int),
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closeCh: make(chan struct{}),
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}
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fg.nodeCtx[nodeName] = &nodeCtx
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}
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// SetEdges set directed edges from in nodes to out nodes
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func (fg *TimeTickedFlowGraph) SetEdges(nodeName string, in []string, out []string) error {
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currentNode, ok := fg.nodeCtx[nodeName]
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if !ok {
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errMsg := "Cannot find node:" + nodeName
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return errors.New(errMsg)
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}
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// init current node's downstream
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currentNode.downstream = make([]*nodeCtx, len(out))
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// set in nodes
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for i, inNodeName := range in {
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inNode, ok := fg.nodeCtx[inNodeName]
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if !ok {
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errMsg := "Cannot find in node:" + inNodeName
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return errors.New(errMsg)
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}
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inNode.downstreamInputChanIdx[nodeName] = i
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}
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// set out nodes
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for i, n := range out {
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outNode, ok := fg.nodeCtx[n]
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if !ok {
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errMsg := "Cannot find out node:" + n
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return errors.New(errMsg)
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}
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maxQueueLength := outNode.node.MaxQueueLength()
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outNode.inputChannels = append(outNode.inputChannels, make(chan Msg, maxQueueLength))
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currentNode.downstream[i] = outNode
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}
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return nil
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}
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// Start starts all nodes in timetick flowgragh
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func (fg *TimeTickedFlowGraph) Start() {
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fg.startOnce.Do(func() {
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wg := sync.WaitGroup{}
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for _, v := range fg.nodeCtx {
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wg.Add(1)
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v.Start(&wg)
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}
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wg.Wait()
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})
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}
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// Close closes all nodes in flowgraph
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func (fg *TimeTickedFlowGraph) Close() {
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fg.stopOnce.Do(func() {
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for _, v := range fg.nodeCtx {
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// maybe need to stop in order
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v.Close()
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}
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})
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}
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// NewTimeTickedFlowGraph create timetick flowgraph
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func NewTimeTickedFlowGraph(ctx context.Context) *TimeTickedFlowGraph {
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flowGraph := TimeTickedFlowGraph{
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nodeCtx: make(map[string]*nodeCtx),
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}
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return &flowGraph
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}
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