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test.go
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test.go
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// 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.
package controllertest // import "go.opentelemetry.io/otel/sdk/metric/controller/controllertest"
import (
"time"
"github.com/benbjohnson/clock"
"go.opentelemetry.io/otel/sdk/instrumentation"
controllerTime "go.opentelemetry.io/otel/sdk/metric/controller/time"
"go.opentelemetry.io/otel/sdk/metric/export"
"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
)
// MockClock is a Clock used for testing.
type MockClock struct {
mock *clock.Mock
}
// MockTicker is a Ticker used for testing.
type MockTicker struct {
ticker *clock.Ticker
}
var _ controllerTime.Clock = MockClock{}
var _ controllerTime.Ticker = MockTicker{}
// NewMockClock returns a new unset MockClock.
func NewMockClock() MockClock {
return MockClock{clock.NewMock()}
}
// Now returns the current time.
func (c MockClock) Now() time.Time {
return c.mock.Now()
}
// Ticker creates a new instance of a Ticker.
func (c MockClock) Ticker(period time.Duration) controllerTime.Ticker {
return MockTicker{c.mock.Ticker(period)}
}
// Add moves the current time of the MockClock forward by the specified
// duration.
func (c MockClock) Add(d time.Duration) {
c.mock.Add(d)
}
// Stop turns off the MockTicker.
func (t MockTicker) Stop() {
t.ticker.Stop()
}
// C returns a channel that receives the current time when MockTicker ticks.
func (t MockTicker) C() <-chan time.Time {
return t.ticker.C
}
// ReadAll is a helper for tests that want a flat iterator over all
// metrics instead of a two-level iterator (instrumentation library,
// metric).
func ReadAll(
reader export.InstrumentationLibraryReader,
kind aggregation.TemporalitySelector,
apply func(instrumentation.Scope, export.Record) error,
) error {
return reader.ForEach(func(library instrumentation.Scope, reader export.Reader) error {
return reader.ForEach(kind, func(record export.Record) error {
return apply(library, record)
})
})
}