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sampler.go
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sampler.go
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// Licensed to SkyAPM org under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. SkyAPM org licenses this file to you 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 go2sky
import (
"math/rand"
"time"
)
type Sampler interface {
IsSampled(operation string) (sampled bool)
}
type ConstSampler struct {
decision bool
}
// NewConstSampler creates a ConstSampler.
func NewConstSampler(sample bool) *ConstSampler {
s := &ConstSampler{
decision: sample,
}
return s
}
// IsSampled implements IsSampled() of Sampler.
func (s *ConstSampler) IsSampled(operation string) bool {
return s.decision
}
type RandomSampler struct {
samplingRate float64
rand *rand.Rand
threshold int
}
// IsSampled implements IsSampled() of Sampler.
func (s *RandomSampler) IsSampled(operation string) bool {
return s.threshold >= s.rand.Intn(100)
}
func (s *RandomSampler) init() {
s.rand = rand.New(rand.NewSource(time.Now().Unix()))
s.threshold = int(s.samplingRate * 100)
}
func NewRandomSampler(samplingRate float64) *RandomSampler {
s := &RandomSampler{
samplingRate: samplingRate,
}
s.init()
return s
}