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producer.go
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producer.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 metric // import "github.com/lightstep/otel-launcher-go/lightstep/sdk/metric"
import (
"context"
"sync"
"time"
"github.com/lightstep/otel-launcher-go/lightstep/sdk/metric/data"
"github.com/lightstep/otel-launcher-go/lightstep/sdk/metric/internal/asyncstate"
)
// providerProducer is the binding between the MeterProvider and the
// Reader. This is the Producer instance that is passed to Register()
// for each Reader.
type providerProducer struct {
lock sync.Mutex
provider *MeterProvider
pipe int
lastCollect time.Time
}
// producerFor returns the new Producer for calling Register.
func (mp *MeterProvider) producerFor(pipe int) Producer {
return &providerProducer{
provider: mp,
pipe: pipe,
lastCollect: mp.startTime,
}
}
// Produce runs collection and produces a new metrics data object.
func (pp *providerProducer) Produce(inout *data.Metrics) data.Metrics {
ordered := pp.provider.getOrdered()
// Note: the Last time is only used in delta-temporality
// scenarios. This lock protects the only stateful change in
// `pp` but does not prevent concurrent collection. If a
// delta-temporality reader were to call Produce
// concurrently, the results would be be recorded with
// non-overlapping timestamps but would have been collected in
// an overlapping way.
pp.lock.Lock()
lastTime := pp.lastCollect
nowTime := time.Now()
pp.lastCollect = nowTime
pp.lock.Unlock()
var output data.Metrics
if inout != nil {
inout.Reset()
output = *inout
}
output.Resource = pp.provider.cfg.res
sequence := data.Sequence{
Start: pp.provider.startTime,
Last: lastTime,
Now: nowTime,
}
ctx := context.Background()
for _, meter := range ordered {
meter.collectFor(
ctx,
pp.pipe,
sequence,
&output,
)
}
return output
}
// collectFor collects from a single meter.
func (m *meter) collectFor(ctx context.Context, pipe int, seq data.Sequence, output *data.Metrics) {
// Use m.lock to briefly access the current lists: syncInsts,
// asyncInsts, callbacks. By releasing these locks, we allow
// new instruments and callbacks to be registered while
// collection happens. The items themselves are synchronized,
// and the slices are only appended to, so shallow copies are
// safe. If new instruments and callbacks are registered while
// this collection happens, they simply will not collect and
// any activity they experience concurrently will be
// registered on the next collection by this reader.
m.lock.Lock()
syncInsts := m.syncInsts
asyncInsts := m.asyncInsts
callbacks := m.callbacks
m.lock.Unlock()
asyncState := asyncstate.NewState(pipe)
for _, cb := range callbacks {
cb.Run(ctx, asyncState)
}
for _, inst := range syncInsts {
inst.SnapshotAndProcess()
}
for _, inst := range asyncInsts {
inst.SnapshotAndProcess(asyncState)
}
scope := data.ReallocateFrom(&output.Scopes)
scope.Library = m.library
for _, coll := range m.compilers[pipe].Collectors() {
coll.Collect(seq, &scope.Instruments)
}
}