80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sharedcomponent
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import (
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"context"
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"errors"
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"testing"
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"github.com/stretchr/testify/assert"
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"go.opentelemetry.io/collector/component"
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"go.opentelemetry.io/collector/component/componenthelper"
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"go.opentelemetry.io/collector/component/componenttest"
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"go.opentelemetry.io/collector/config"
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)
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var id = config.NewID("test")
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func TestNewSharedComponents(t *testing.T) {
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comps := NewSharedComponents()
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assert.Len(t, comps.comps, 0)
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}
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func TestSharedComponents_GetOrAdd(t *testing.T) {
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nop := componenthelper.New()
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createNop := func() component.Component { return nop }
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comps := NewSharedComponents()
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got := comps.GetOrAdd(id, createNop)
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assert.Len(t, comps.comps, 1)
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assert.Same(t, nop, got.Unwrap())
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assert.Same(t, got, comps.GetOrAdd(id, createNop))
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// Shutdown nop will remove
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assert.NoError(t, got.Shutdown(context.Background()))
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assert.Len(t, comps.comps, 0)
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assert.NotSame(t, got, comps.GetOrAdd(id, createNop))
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}
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func TestSharedComponent(t *testing.T) {
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wantErr := errors.New("my error")
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calledStart := 0
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calledStop := 0
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comp := componenthelper.New(
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componenthelper.WithStart(func(ctx context.Context, host component.Host) error {
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calledStart++
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return wantErr
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}), componenthelper.WithShutdown(func(ctx context.Context) error {
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calledStop++
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return wantErr
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}))
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createComp := func() component.Component { return comp }
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comps := NewSharedComponents()
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got := comps.GetOrAdd(id, createComp)
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assert.Equal(t, wantErr, got.Start(context.Background(), componenttest.NewNopHost()))
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assert.Equal(t, 1, calledStart)
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// Second time is not called anymore.
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assert.NoError(t, got.Start(context.Background(), componenttest.NewNopHost()))
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assert.Equal(t, 1, calledStart)
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assert.Equal(t, wantErr, got.Shutdown(context.Background()))
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assert.Equal(t, 1, calledStop)
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// Second time is not called anymore.
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assert.NoError(t, got.Shutdown(context.Background()))
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assert.Equal(t, 1, calledStop)
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}
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