mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2024-12-21 02:03:19 +00:00
44 lines
1.4 KiB
Go
44 lines
1.4 KiB
Go
// 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://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 trace // import "go.opentelemetry.io/otel/sdk/trace"
|
|
|
|
// evictedQueue is a FIFO queue with a configurable capacity.
|
|
type evictedQueue struct {
|
|
queue []interface{}
|
|
capacity int
|
|
droppedCount int
|
|
}
|
|
|
|
func newEvictedQueue(capacity int) evictedQueue {
|
|
// Do not pre-allocate queue, do this lazily.
|
|
return evictedQueue{capacity: capacity}
|
|
}
|
|
|
|
// add adds value to the evictedQueue eq. If eq is at capacity, the oldest
|
|
// queued value will be discarded and the drop count incremented.
|
|
func (eq *evictedQueue) add(value interface{}) {
|
|
if eq.capacity == 0 {
|
|
eq.droppedCount++
|
|
return
|
|
}
|
|
|
|
if eq.capacity > 0 && len(eq.queue) == eq.capacity {
|
|
// Drop first-in while avoiding allocating more capacity to eq.queue.
|
|
copy(eq.queue[:eq.capacity-1], eq.queue[1:])
|
|
eq.queue = eq.queue[:eq.capacity-1]
|
|
eq.droppedCount++
|
|
}
|
|
eq.queue = append(eq.queue, value)
|
|
}
|