mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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93 lines
3.3 KiB
Go
93 lines
3.3 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 metric // import "go.opentelemetry.io/otel/sdk/metric"
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import (
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"context"
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"go.opentelemetry.io/otel/metric"
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"go.opentelemetry.io/otel/metric/instrument"
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"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
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"go.opentelemetry.io/otel/metric/instrument/asyncint64"
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"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
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"go.opentelemetry.io/otel/metric/instrument/syncint64"
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"go.opentelemetry.io/otel/sdk/instrumentation"
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)
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// meter handles the creation and coordination of all metric instruments. A
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// meter represents a single instrumentation scope; all metric telemetry
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// produced by an instrumentation scope will use metric instruments from a
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// single meter.
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type meter struct {
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instrumentation.Scope
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// *Resolvers are used by the provided instrument providers to resolve new
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// instruments aggregators and maintain a cache across instruments this
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// meter owns.
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int64Resolver resolver[int64]
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float64Resolver resolver[float64]
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pipes pipelines
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}
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func newMeter(s instrumentation.Scope, p pipelines) *meter {
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// viewCache ensures instrument conflicts, including number conflicts, this
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// meter is asked to create are logged to the user.
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var viewCache cache[string, instrumentID]
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// Passing nil as the ac parameter to newInstrumentCache will have each
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// create its own aggregator cache.
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ic := newInstrumentCache[int64](nil, &viewCache)
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fc := newInstrumentCache[float64](nil, &viewCache)
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return &meter{
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Scope: s,
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pipes: p,
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int64Resolver: newResolver(p, ic),
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float64Resolver: newResolver(p, fc),
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}
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}
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// Compile-time check meter implements metric.Meter.
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var _ metric.Meter = (*meter)(nil)
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// AsyncInt64 returns the asynchronous integer instrument provider.
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func (m *meter) AsyncInt64() asyncint64.InstrumentProvider {
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return asyncInt64Provider{scope: m.Scope, resolve: &m.int64Resolver}
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}
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// AsyncFloat64 returns the asynchronous floating-point instrument provider.
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func (m *meter) AsyncFloat64() asyncfloat64.InstrumentProvider {
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return asyncFloat64Provider{scope: m.Scope, resolve: &m.float64Resolver}
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}
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// RegisterCallback registers the function f to be called when any of the
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// insts Collect method is called.
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func (m *meter) RegisterCallback(insts []instrument.Asynchronous, f func(context.Context)) error {
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m.pipes.registerCallback(f)
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return nil
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}
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// SyncInt64 returns the synchronous integer instrument provider.
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func (m *meter) SyncInt64() syncint64.InstrumentProvider {
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return syncInt64Provider{scope: m.Scope, resolve: &m.int64Resolver}
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}
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// SyncFloat64 returns the synchronous floating-point instrument provider.
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func (m *meter) SyncFloat64() syncfloat64.InstrumentProvider {
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return syncFloat64Provider{scope: m.Scope, resolve: &m.float64Resolver}
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}
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