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storage_memory.go
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storage_memory.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package groupbytraceprocessor // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/groupbytraceprocessor"
import (
"context"
"sync"
"time"
"go.opencensus.io/stats"
"go.opentelemetry.io/collector/pdata/pcommon"
"go.opentelemetry.io/collector/pdata/ptrace"
)
type memoryStorage struct {
sync.RWMutex
content map[pcommon.TraceID][]ptrace.ResourceSpans
stopped bool
stoppedLock sync.RWMutex
metricsCollectionInterval time.Duration
}
var _ storage = (*memoryStorage)(nil)
func newMemoryStorage() *memoryStorage {
return &memoryStorage{
content: make(map[pcommon.TraceID][]ptrace.ResourceSpans),
metricsCollectionInterval: time.Second,
}
}
func (st *memoryStorage) createOrAppend(traceID pcommon.TraceID, td ptrace.Traces) error {
st.Lock()
defer st.Unlock()
// getting zero value is fine
content := st.content[traceID]
newRss := ptrace.NewResourceSpansSlice()
td.ResourceSpans().CopyTo(newRss)
for i := 0; i < newRss.Len(); i++ {
content = append(content, newRss.At(i))
}
st.content[traceID] = content
return nil
}
func (st *memoryStorage) get(traceID pcommon.TraceID) ([]ptrace.ResourceSpans, error) {
st.RLock()
rss, ok := st.content[traceID]
st.RUnlock()
if !ok {
return nil, nil
}
result := make([]ptrace.ResourceSpans, len(rss))
for i, rs := range rss {
newRS := ptrace.NewResourceSpans()
rs.CopyTo(newRS)
result[i] = newRS
}
return result, nil
}
// delete will return a reference to a ResourceSpans. Changes to the returned object may not be applied
// to the version in the storage.
func (st *memoryStorage) delete(traceID pcommon.TraceID) ([]ptrace.ResourceSpans, error) {
st.Lock()
defer st.Unlock()
defer delete(st.content, traceID)
return st.content[traceID], nil
}
func (st *memoryStorage) start() error {
go st.periodicMetrics()
return nil
}
func (st *memoryStorage) shutdown() error {
st.stoppedLock.Lock()
defer st.stoppedLock.Unlock()
st.stopped = true
return nil
}
func (st *memoryStorage) periodicMetrics() {
numTraces := st.count()
stats.Record(context.Background(), mNumTracesInMemory.M(int64(numTraces)))
st.stoppedLock.RLock()
stopped := st.stopped
st.stoppedLock.RUnlock()
if stopped {
return
}
time.AfterFunc(st.metricsCollectionInterval, func() {
st.periodicMetrics()
})
}
func (st *memoryStorage) count() int {
st.RLock()
defer st.RUnlock()
return len(st.content)
}