mirror of https://github.com/docker/cli.git
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package trace // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"slices"
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"sync"
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"go.opentelemetry.io/otel/internal/global"
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)
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// evictedQueue is a FIFO queue with a configurable capacity.
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type evictedQueue[T any] struct {
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queue []T
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capacity int
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droppedCount int
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logDropped func()
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}
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func newEvictedQueueEvent(capacity int) evictedQueue[Event] {
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// Do not pre-allocate queue, do this lazily.
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return evictedQueue[Event]{
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capacity: capacity,
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logDropped: sync.OnceFunc(func() { global.Warn("limit reached: dropping trace trace.Event") }),
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}
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}
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func newEvictedQueueLink(capacity int) evictedQueue[Link] {
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// Do not pre-allocate queue, do this lazily.
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return evictedQueue[Link]{
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capacity: capacity,
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logDropped: sync.OnceFunc(func() { global.Warn("limit reached: dropping trace trace.Link") }),
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}
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}
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// add adds value to the evictedQueue eq. If eq is at capacity, the oldest
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// queued value will be discarded and the drop count incremented.
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func (eq *evictedQueue[T]) add(value T) {
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if eq.capacity == 0 {
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eq.droppedCount++
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eq.logDropped()
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return
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}
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if eq.capacity > 0 && len(eq.queue) == eq.capacity {
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// Drop first-in while avoiding allocating more capacity to eq.queue.
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copy(eq.queue[:eq.capacity-1], eq.queue[1:])
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eq.queue = eq.queue[:eq.capacity-1]
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eq.droppedCount++
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eq.logDropped()
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}
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eq.queue = append(eq.queue, value)
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}
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// copy returns a copy of the evictedQueue.
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func (eq *evictedQueue[T]) copy() []T {
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return slices.Clone(eq.queue)
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}
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