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aggregated_encoder.go
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/
aggregated_encoder.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package protobuf
import (
"github.com/m3db/m3/src/metrics/generated/proto/metricpb"
"github.com/m3db/m3/src/metrics/metric/aggregated"
"github.com/m3db/m3/src/x/pool"
)
// AggregatedEncoder is an encoder for encoding aggregated metrics.
type AggregatedEncoder interface {
// Encode encodes a metric with an applicable storage policy,
// alongside the time at which encoding happens.
Encode(m aggregated.MetricWithStoragePolicy, encodedAtNanos int64) error
// Buffer returns the encoded buffer.
Buffer() Buffer
}
type aggregatedEncoder struct {
pool pool.BytesPool
pb metricpb.AggregatedMetric
buf []byte
}
// NewAggregatedEncoder creates a new aggregated encoder.
func NewAggregatedEncoder(p pool.BytesPool) AggregatedEncoder {
e := &aggregatedEncoder{
pool: p,
}
return e
}
func (enc *aggregatedEncoder) Encode(
m aggregated.MetricWithStoragePolicy,
encodedAtNanos int64,
) error {
resetAggregatedMetricProto(&enc.pb)
if err := m.ToProto(&enc.pb.Metric); err != nil {
return err
}
enc.pb.EncodeNanos = encodedAtNanos
// Always allocate a new byte slice to avoid modifying the existing one which may still being used.
enc.buf = allocate(enc.pool, enc.pb.Size())
n, err := enc.pb.MarshalTo(enc.buf)
enc.buf = enc.buf[:n]
return err
}
func (enc *aggregatedEncoder) Buffer() Buffer {
return NewBuffer(enc.buf, enc.pool)
}