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60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// Copyright (C) 2015 Space Monkey, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package monkit
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// spanBag is a bag data structure (can add 0 or more references to a span,
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// where every add needs to be matched with an equivalent remove). spanBag has
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// a fast path for dealing with cases where the bag only has one element (the
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// common case). spanBag is not threadsafe
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type spanBag struct {
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first *Span
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rest map[*Span]int32
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}
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func (b *spanBag) Add(s *Span) {
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if b.first == nil {
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b.first = s
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return
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}
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if b.rest == nil {
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b.rest = map[*Span]int32{}
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}
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b.rest[s] += 1
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}
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func (b *spanBag) Remove(s *Span) {
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if b.first == s {
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b.first = nil
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return
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}
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// okay it must be in b.rest
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count := b.rest[s]
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if count <= 1 {
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delete(b.rest, s)
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} else {
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b.rest[s] = count - 1
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}
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}
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// Iterate returns all elements
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func (b *spanBag) Iterate(cb func(*Span)) {
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if b.first != nil {
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cb(b.first)
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}
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for s := range b.rest {
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cb(s)
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}
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}
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