From 77a3b3e86b06504bdf37e35d83a192806a95a63e Mon Sep 17 00:00:00 2001
From: SangTran-127 <tranquangsang12.7@gmail.com>
Date: Sat, 8 Aug 2026 11:31:29 +0700
Subject: initialize goflink module with core stream record implementation

---
 .gitignore     |  1 +
 core/record.go | 40 ++++++++++++++++++++++++++++++++++++++++
 go.mod         |  3 +++
 main.go        | 13 +++++++++++++
 4 files changed, 57 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 core/record.go
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..62c8935
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea/
\ No newline at end of file
diff --git a/core/record.go b/core/record.go
new file mode 100644
index 0000000..cb160b2
--- /dev/null
+++ b/core/record.go
@@ -0,0 +1,40 @@
+package core
+
+type RecordType byte
+
+const (
+	RecordData RecordType = iota
+	RecordWatermark
+	RecordBarrier
+)
+
+type StreamRecord[T any] struct {
+	Value     T
+	Key       string // for keyBy stateful processing
+	Timestamp int64  // epoch ms time
+	BarrierID uint64 // ID checkpoint barrier
+	Type      RecordType
+}
+
+func NewDataRecord[T any](key string, val T, timestamp int64) *StreamRecord[T] {
+	return &StreamRecord[T]{
+		Value:     val,
+		Key:       key,
+		Timestamp: timestamp,
+		Type:      RecordData,
+	}
+}
+
+func NewWatermarkRecord[T any](timestamp int64) *StreamRecord[T] {
+	return &StreamRecord[T]{
+		Type:      RecordWatermark,
+		Timestamp: timestamp,
+	}
+}
+
+func NewBarrierRecord[T any](barrierID uint64) *StreamRecord[T] {
+	return &StreamRecord[T]{
+		Type:      RecordBarrier,
+		BarrierID: barrierID,
+	}
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5d934cd
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module goflink
+
+go 1.26.3
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..25792c1
--- /dev/null
+++ b/main.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+	"goflink/core"
+	"unsafe"
+)
+
+func main() {
+
+	fmt.Printf("GoodRecord Size: %d bytes\n", unsafe.Sizeof(core.StreamRecord[int]{}))
+
+}
-- 
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