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storage_memory.go
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storage_memory.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:https://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 groupbytraceprocessor
import (
"context"
"sync"
"time"
"go.opencensus.io/stats"
"go.opentelemetry.io/collector/consumer/pdata"
)
type memoryStorage struct {
sync.RWMutex
content map[pdata.TraceID][]pdata.ResourceSpans
stopped bool
stoppedLock sync.RWMutex
metricsCollectionInterval time.Duration
}
var _ storage = (*memoryStorage)(nil)
func newMemoryStorage() *memoryStorage {
return &memoryStorage{
content: make(map[pdata.TraceID][]pdata.ResourceSpans),
metricsCollectionInterval: time.Second,
}
}
func (st *memoryStorage) createOrAppend(traceID pdata.TraceID, rs pdata.ResourceSpans) error {
st.Lock()
defer st.Unlock()
// getting zero value is fine
content := st.content[traceID]
newRS := pdata.NewResourceSpans()
rs.CopyTo(newRS)
content = append(content, newRS)
st.content[traceID] = content
return nil
}
func (st *memoryStorage) get(traceID pdata.TraceID) ([]pdata.ResourceSpans, error) {
st.RLock()
rss, ok := st.content[traceID]
st.RUnlock()
if !ok {
return nil, nil
}
var result []pdata.ResourceSpans
for _, rs := range rss {
newRS := pdata.NewResourceSpans()
rs.CopyTo(newRS)
result = append(result, 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 pdata.TraceID) ([]pdata.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() error {
numTraces := st.count()
stats.Record(context.Background(), mNumTracesInMemory.M(int64(numTraces)))
st.stoppedLock.RLock()
stopped := st.stopped
st.stoppedLock.RUnlock()
if stopped {
return nil
}
time.AfterFunc(st.metricsCollectionInterval, func() {
st.periodicMetrics()
})
return nil
}
func (st *memoryStorage) count() int {
st.RLock()
defer st.RUnlock()
return len(st.content)
}