分块传输内容可以写入到内存中/分块传输内容可以判断最大尺寸

internal/utils/sets/set_fixed.go

@@ -0,0 +1,64 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package setutils
+
+import (
+	"github.com/TeaOSLab/EdgeNode/internal/zero"
+	"sync"
+)
+
+type FixedSet struct {
+	maxSize int
+	locker  sync.RWMutex
+
+	m    map[interface{}]zero.Zero
+	keys []interface{}
+}
+
+func NewFixedSet(maxSize int) *FixedSet {
+	if maxSize <= 0 {
+		maxSize = 1024
+	}
+	return &FixedSet{
+		maxSize: maxSize,
+		m:       map[interface{}]zero.Zero{},
+	}
+}
+
+func (this *FixedSet) Push(item interface{}) {
+	this.locker.Lock()
+	_, ok := this.m[item]
+	if !ok {
+		// 是否已满
+		if len(this.keys) == this.maxSize {
+			var firstKey = this.keys[0]
+			this.keys = this.keys[1:]
+			delete(this.m, firstKey)
+		}
+
+		this.m[item] = zero.New()
+		this.keys = append(this.keys, item)
+	}
+	this.locker.Unlock()
+}
+
+func (this *FixedSet) Has(item interface{}) bool {
+	this.locker.RLock()
+	defer this.locker.RUnlock()
+
+	_, ok := this.m[item]
+	return ok
+}
+
+func (this *FixedSet) Size() int {
+	this.locker.RLock()
+	defer this.locker.RUnlock()
+	return len(this.keys)
+}
+
+func (this *FixedSet) Reset() {
+	this.locker.Lock()
+	this.m = map[interface{}]zero.Zero{}
+	this.keys = nil
+	this.locker.Unlock()
+}