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Extract service.pipelines interface, add skeleton graph implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| // Copyright The OpenTelemetry Authors | ||
| // | ||
| // Licensed 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. | ||
|
|
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| package service // import "go.opentelemetry.io/collector/service" | ||
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| import ( | ||
| "context" | ||
| "net/http" | ||
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| "gonum.org/v1/gonum/graph/simple" | ||
| "gonum.org/v1/gonum/graph/topo" | ||
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| "go.opentelemetry.io/collector/component" | ||
| ) | ||
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| var _ pipelines = (*pipelinesGraph)(nil) | ||
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| type pipelinesGraph struct { | ||
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| // All component instances represented as nodes, with directed edges indicating data flow. | ||
| componentGraph *simple.DirectedGraph | ||
| } | ||
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| func (g *pipelinesGraph) StartAll(ctx context.Context, host component.Host) error { | ||
| nodes, err := topo.Sort(g.componentGraph) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| // Start exporters first, and work towards receivers | ||
| for i := len(nodes) - 1; i >= 0; i-- { | ||
| comp, ok := nodes[i].(component.Component) | ||
| if !ok { | ||
| continue | ||
| } | ||
| if compErr := comp.Start(ctx, host); compErr != nil { | ||
| return compErr | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (g *pipelinesGraph) ShutdownAll(ctx context.Context) error { | ||
| nodes, err := topo.Sort(g.componentGraph) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| // Stop receivers first, and work towards exporters | ||
| for i := 0; i < len(nodes); i++ { | ||
| comp, ok := nodes[i].(component.Component) | ||
| if !ok { | ||
| continue | ||
| } | ||
| if compErr := comp.Shutdown(ctx); compErr != nil { | ||
| return compErr | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (g *pipelinesGraph) GetExporters() map[component.DataType]map[component.ID]component.Component { | ||
| // TODO actual implemenation | ||
| return make(map[component.DataType]map[component.ID]component.Component) | ||
| } | ||
|
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| func (g *pipelinesGraph) HandleZPages(w http.ResponseWriter, r *http.Request) { | ||
| // TODO actual implemenation | ||
| } |
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