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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 metric // import "go.opentelemetry.io/otel/metric"
import (
"context"
"go.opentelemetry.io/otel/label"
"go.opentelemetry.io/otel/metric/number"
)
// MeterImpl is the interface an SDK must implement to supply a Meter
// implementation.
type MeterImpl interface {
// RecordBatch atomically records a batch of measurements.
RecordBatch(ctx context.Context, labels []label.KeyValue, measurement ...Measurement)
// NewSyncInstrument returns a newly constructed
// synchronous instrument implementation or an error, should
// one occur.
NewSyncInstrument(descriptor Descriptor) (SyncImpl, error)
// NewAsyncInstrument returns a newly constructed
// asynchronous instrument implementation or an error, should
// one occur.
NewAsyncInstrument(
descriptor Descriptor,
runner AsyncRunner,
) (AsyncImpl, error)
}
// InstrumentImpl is a common interface for synchronous and
// asynchronous instruments.
type InstrumentImpl interface {
// Implementation returns the underlying implementation of the
// instrument, which allows the implementation to gain access
// to its own representation especially from a `Measurement`.
Implementation() interface{}
// Descriptor returns a copy of the instrument's Descriptor.
Descriptor() Descriptor
}
// SyncImpl is the implementation-level interface to a generic
// synchronous instrument (e.g., ValueRecorder and Counter instruments).
type SyncImpl interface {
InstrumentImpl
// Bind creates an implementation-level bound instrument,
// binding a label set with this instrument implementation.
Bind(labels []label.KeyValue) BoundSyncImpl
// RecordOne captures a single synchronous metric event.
RecordOne(ctx context.Context, number number.Number, labels []label.KeyValue)
}
// BoundSyncImpl is the implementation-level interface to a
// generic bound synchronous instrument
type BoundSyncImpl interface {
// RecordOne captures a single synchronous metric event.
RecordOne(ctx context.Context, number number.Number)
// Unbind frees the resources associated with this bound instrument. It
// does not affect the metric this bound instrument was created through.
Unbind()
}
// AsyncImpl is an implementation-level interface to an
// asynchronous instrument (e.g., Observer instruments).
type AsyncImpl interface {
InstrumentImpl
}
// WrapMeterImpl constructs a `Meter` implementation from a
// `MeterImpl` implementation.
func WrapMeterImpl(impl MeterImpl, instrumentationName string, opts ...MeterOption) Meter {
return Meter{
impl: impl,
name: instrumentationName,
version: NewMeterConfig(opts...).InstrumentationVersion,
}
}
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