From dc25bdab2f2d8ffbf06acbc6d4488e23f0632919 Mon Sep 17 00:00:00 2001
From: dudaodong <lanliddd.2007@163.com>
Date: Fri, 15 Apr 2022 15:56:06 +0800
Subject: [PATCH] feat: add Generate chan function in concurrency package

---
 concurrency/channel.go      | 34 ++++++++++++++++++++++++++++++++++
 concurrency/channel_test.go | 24 ++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 concurrency/channel.go
 create mode 100644 concurrency/channel_test.go

diff --git a/concurrency/channel.go b/concurrency/channel.go
new file mode 100644
index 0000000..86cdf6e
--- /dev/null
+++ b/concurrency/channel.go
@@ -0,0 +1,34 @@
+// Copyright 2021 dudaodong@gmail.com. All rights reserved.
+// Use of this source code is governed by MIT license
+
+// Package concurrency contain some functions to support concurrent programming. eg, goroutine, channel, async.
+package concurrency
+
+// Channel is a logic object which implemented by go chan
+// all methods of channel are in the book tiled《Concurrency in Go》
+type Channel struct {
+}
+
+// NewChannel return a Channel instance
+func NewChannel() *Channel {
+	return &Channel{}
+}
+
+// Generate a data of type any chan
+func (c *Channel) Generate(done <-chan any, datas ...any) <-chan any {
+	dataStream := make(chan any)
+
+	go func() {
+		defer close(dataStream)
+
+		for _, v := range datas {
+			select {
+			case <-done:
+				return
+			case dataStream <- v:
+			}
+		}
+	}()
+
+	return dataStream
+}
diff --git a/concurrency/channel_test.go b/concurrency/channel_test.go
new file mode 100644
index 0000000..c1d3396
--- /dev/null
+++ b/concurrency/channel_test.go
@@ -0,0 +1,24 @@
+package concurrency
+
+import (
+	"testing"
+
+	"github.com/duke-git/lancet/v2/internal"
+)
+
+func TestGenerate(t *testing.T) {
+	assert := internal.NewAssert(t, "TestToChar")
+
+	done := make(chan any)
+	defer close(done)
+
+	c := NewChannel()
+	intStream := c.Generate(done, 1, 2, 3)
+
+	// for v := range intStream {
+	// 	t.Log(v)
+	// }
+	assert.Equal(1, <-intStream)
+	assert.Equal(2, <-intStream)
+	assert.Equal(3, <-intStream)
+}