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tokenbucketfactory.go
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tokenbucketfactory.go
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// The MIT License (MIT)
// Copyright (c) 2017-2020 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 sampled
import (
"sync"
"github.com/uber/cadence/common/clock"
"github.com/uber/cadence/common/dynamicconfig"
"github.com/uber/cadence/common/tokenbucket"
)
type RateLimiterFactoryFunc func(timeSource clock.TimeSource, numOfPriority int, qpsConfig dynamicconfig.IntPropertyFnWithDomainFilter) RateLimiterFactory
type RateLimiterFactory interface {
GetRateLimiter(domain string) tokenbucket.PriorityTokenBucket
}
type domainToBucketMap struct {
sync.RWMutex
timeSource clock.TimeSource
qpsConfig dynamicconfig.IntPropertyFnWithDomainFilter
numOfPriority int
mappings map[string]tokenbucket.PriorityTokenBucket
}
// NewDomainToBucketMap returns a rate limiter factory.
func NewDomainToBucketMap(timeSource clock.TimeSource, numOfPriority int, qpsConfig dynamicconfig.IntPropertyFnWithDomainFilter) RateLimiterFactory {
return &domainToBucketMap{
timeSource: timeSource,
qpsConfig: qpsConfig,
numOfPriority: numOfPriority,
mappings: make(map[string]tokenbucket.PriorityTokenBucket),
}
}
func (m *domainToBucketMap) GetRateLimiter(domain string) tokenbucket.PriorityTokenBucket {
m.RLock()
rateLimiter, exist := m.mappings[domain]
m.RUnlock()
if exist {
return rateLimiter
}
m.Lock()
if rateLimiter, ok := m.mappings[domain]; ok { // read again to ensure no duplicate create
m.Unlock()
return rateLimiter
}
rateLimiter = tokenbucket.NewFullPriorityTokenBucket(m.numOfPriority, m.qpsConfig(domain), m.timeSource)
m.mappings[domain] = rateLimiter
m.Unlock()
return rateLimiter
}