forked from Dynatrace/dynatrace-configuration-as-code-core
/
concurrent.go
51 lines (46 loc) · 1.64 KB
/
concurrent.go
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// @license
// Copyright 2023 Dynatrace LLC
// 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://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 rest
// ConcurrentRequestLimiter represents a component for limiting concurrent requests.
type ConcurrentRequestLimiter struct {
sem chan struct{}
}
// NewConcurrentRequestLimiter creates a new instance of ConcurrentRequestLimiter with the specified limit to apply.
func NewConcurrentRequestLimiter(maxConcurrent int) *ConcurrentRequestLimiter {
if maxConcurrent <= 0 {
// If maxConcurrent is 0 or negative, set the semaphore channel to nil to represent no limit.
return &ConcurrentRequestLimiter{
sem: nil,
}
}
return &ConcurrentRequestLimiter{
sem: make(chan struct{}, maxConcurrent),
}
}
// Acquire acquires a slot from the concurrent request limiter to check for maximum concurrent requests.
func (c *ConcurrentRequestLimiter) Acquire() {
if c.sem != nil {
c.sem <- struct{}{}
}
}
// Release releases a slot from the concurrent request limiter to allow subsequent requests to proceed.
func (c *ConcurrentRequestLimiter) Release() {
if c.sem != nil {
select {
case <-c.sem:
default:
// If the semaphore is already empty, do nothing
}
}
}