Initial commit (code only without large binaries)

EdgeNode/internal/js/context_pool.go

@@ -0,0 +1,61 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+//go:build script
+// +build script
+
+package js
+
+type ContextPool struct {
+	ch      chan *Context
+	maxSize int
+}
+
+func NewContextPool(maxSize int) *ContextPool {
+	if maxSize <= 0 {
+		maxSize = 128
+	}
+	return &ContextPool{
+		ch:      make(chan *Context, maxSize),
+		maxSize: maxSize,
+	}
+}
+
+func (this *ContextPool) MaxSize() int {
+	return this.maxSize
+}
+
+func (this *ContextPool) Size() int {
+	return len(this.ch)
+}
+
+func (this *ContextPool) Get() *Context {
+	// 不需要default语句，我们要确保整个Pool中只有固定的元素，防止内存溢出
+	select {
+	case ctx := <-this.ch:
+		return ctx
+	}
+}
+
+func (this *ContextPool) Put(ctx *Context) {
+	ctx.Cleanup()
+	select {
+	case this.ch <- ctx:
+	default:
+		ctx.Close()
+	}
+}
+
+func (this *ContextPool) IsUsing() bool {
+	return len(this.ch) != this.maxSize
+}
+
+func (this *ContextPool) Close() {
+Loop:
+	for {
+		select {
+		case ctx := <-this.ch:
+			ctx.Close()
+		default:
+			break Loop
+		}
+	}
+}