diff --git a/.gitignore b/.gitignore
index 66fd13c..e3d7614 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+.vscode/
diff --git a/extensions/lock/lock.go b/extensions/lock/lock.go
new file mode 100644
index 0000000..1e74f65
--- /dev/null
+++ b/extensions/lock/lock.go
@@ -0,0 +1,76 @@
+package lock
+
+import (
+	"errors"
+	"io/fs"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/AzureAD/microsoft-authentication-extensions-for-go/flock"
+)
+
+type Lock struct {
+	retries    int
+	retryDelay time.Duration
+
+	fLock *flock.Flock
+	mu    sync.Mutex
+}
+
+type Option func(l *Lock)
+
+func WithRetries(n int) Option {
+	return func(l *Lock) {
+		l.retries = n
+	}
+}
+func WithRetryDelay(t time.Duration) Option {
+	return func(l *Lock) {
+		l.retryDelay = t
+	}
+}
+
+func New(lockFileName string, options ...Option) (*Lock, error) {
+	l := &Lock{}
+	for _, o := range options {
+		o(l)
+	}
+	l.fLock = flock.New(lockFileName)
+	return l, nil
+}
+
+func (l *Lock) Lock() error {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	for tryCount := 0; tryCount < l.retries; tryCount++ {
+		locked, err := l.fLock.TryLock()
+		if err != nil || !locked {
+			time.Sleep(l.retryDelay * time.Millisecond)
+			continue
+		} else if locked {
+			// commenting this till we have flock merged in and ready to use with changes
+			// otherwise it would not compile
+			//l.fLock.Fh.WriteString(fmt.Sprintf("{%d} {%s}", os.Getpid(), os.Args[0]))
+			//l.fLock.Fh.Sync()
+			return nil
+		}
+	}
+	return errors.New("failed to acquire lock")
+}
+
+func (l *Lock) UnLock() error {
+	if l.fLock != nil {
+		if err := l.fLock.Unlock(); err != nil {
+			return err
+		}
+		err := os.Remove(l.fLock.Path())
+		if err != nil {
+			errVal := err.(*fs.PathError)
+			if errVal != fs.ErrNotExist || errVal != fs.ErrPermission {
+				return err
+			}
+		}
+	}
+	return nil
+}
diff --git a/extensions/lock/lock_test.go b/extensions/lock/lock_test.go
new file mode 100644
index 0000000..3d7ca78
--- /dev/null
+++ b/extensions/lock/lock_test.go
@@ -0,0 +1,121 @@
+package lock
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/AzureAD/microsoft-authentication-extensions-for-go/internal"
+)
+
+const cacheFile = "cache.txt"
+
+func TestLocking(t *testing.T) {
+
+	tests := []struct {
+		desc          string
+		concurrency   int
+		sleepInterval time.Duration
+		cacheFile     string
+	}{
+		{"Normal", 4, 50 * time.Millisecond, "cache_normal"},
+		{"High", 40, 50 * time.Millisecond, "cache_high"},
+	}
+
+	for _, test := range tests {
+		tmpfile, err := ioutil.TempFile("", test.cacheFile)
+		defer os.Remove(tmpfile.Name())
+		if err != nil {
+			t.Fatalf("TestLocking(%s): Could not create cache file", test.desc)
+		}
+		err = spin(test.concurrency, time.Duration(test.sleepInterval), tmpfile.Name())
+		if err != nil {
+			t.Fatalf("TestLocking(%s): %s", test.desc, err)
+		}
+	}
+
+}
+func acquire(threadNo int, sleepInterval time.Duration, cacheFile string) {
+	cacheAccessor := internal.NewFileAccessor(cacheFile)
+	lockfileName := cacheFile + ".lockfile"
+	l, err := New(lockfileName, WithRetries(60), WithRetryDelay(100))
+	if err := l.Lock(); err != nil {
+		log.Println("Couldn't acquire lock", err.Error())
+		return
+	}
+	defer l.UnLock()
+	data, err := cacheAccessor.Read()
+	if err != nil {
+		log.Println(err)
+	}
+	var buffer bytes.Buffer
+	buffer.Write(data)
+	buffer.WriteString(fmt.Sprintf("< %d \n", threadNo))
+	time.Sleep(sleepInterval)
+	buffer.WriteString(fmt.Sprintf("> %d \n", threadNo))
+	cacheAccessor.Write(buffer.Bytes())
+}
+
+func spin(concurrency int, sleepInterval time.Duration, cacheFile string) error {
+	var wg sync.WaitGroup
+	wg.Add(concurrency)
+	for i := 0; i < concurrency; i++ {
+		go func(i int) {
+			defer wg.Done()
+			acquire(i, sleepInterval, cacheFile)
+		}(i)
+	}
+	wg.Wait()
+	i, err := validate(cacheFile)
+	if err != nil {
+		return err
+	}
+	if i != concurrency*2 {
+		return fmt.Errorf("should have seen %d line entries, found %d", concurrency*2, i)
+	}
+	return nil
+}
+
+func validate(cacheFile string) (int, error) {
+	var (
+		count               int
+		prevProc, tag, proc string
+	)
+	data, err := os.ReadFile(cacheFile)
+	if err != nil {
+		log.Println(err)
+	}
+	temp := strings.Split(string(data), "\n")
+
+	for _, s := range temp {
+		if strings.TrimSpace(s) == "" {
+			continue
+		}
+		count += 1
+		split := strings.Split(s, " ")
+		tag = split[0]
+		proc = split[1]
+		if prevProc == "" {
+			if tag != "<" {
+				return 0, errors.New("opening bracket not found")
+			}
+			prevProc = proc
+			continue
+		}
+		if proc != prevProc {
+			return 0, errors.New("process overlap found")
+		}
+		if tag != ">" {
+			return 0, errors.New("process overlap found")
+		}
+		prevProc = ""
+	}
+	return count, nil
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2ead327
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module github.com/AzureAD/microsoft-authentication-extensions-for-go
+
+go 1.14
+
+require (
+	github.com/AzureAD/microsoft-authentication-library-for-go v0.3.0
+	github.com/billgraziano/dpapi v0.4.0
+	github.com/gofrs/flock v0.8.1
+
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..241840d
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,197 @@
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+github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
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+github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
+github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
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+github.com/AzureAD/microsoft-authentication-library-for-go v0.3.0/go.mod h1:5aEdWF4KzHyRg5i5ItqNcv12iMQr/kYTYaX+GpdEcj8=
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diff --git a/internal/accessor/accessor.go b/internal/accessor/accessor.go
new file mode 100644
index 0000000..81b2a8b
--- /dev/null
+++ b/internal/accessor/accessor.go
@@ -0,0 +1 @@
+package accessor
diff --git a/internal/accessor/file/file.go b/internal/accessor/file/file.go
new file mode 100644
index 0000000..b691ba5
--- /dev/null
+++ b/internal/accessor/file/file.go
@@ -0,0 +1 @@
+package file
diff --git a/internal/accessor/windows/windows.go b/internal/accessor/windows/windows.go
new file mode 100644
index 0000000..e69de29
diff --git a/internal/cache_accessor.go b/internal/cache_accessor.go
new file mode 100644
index 0000000..ed5195b
--- /dev/null
+++ b/internal/cache_accessor.go
@@ -0,0 +1,50 @@
+package internal
+
+import (
+	"io/ioutil"
+	"os"
+)
+
+type cacheAccessor interface {
+	Read() ([]byte, error)
+	Write(data []byte)
+	Delete()
+}
+
+type FileAccessor struct {
+	cacheFilePath string
+}
+
+func NewFileAccessor(cacheFilePath string) *FileAccessor {
+	return &FileAccessor{cacheFilePath: cacheFilePath}
+}
+
+func (f *FileAccessor) Read() ([]byte, error) {
+	var data []byte
+	file, err := os.Open(f.cacheFilePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	data, err = ioutil.ReadAll(file)
+	if err != nil {
+		return nil, err
+	}
+	return data, nil
+}
+
+func (f *FileAccessor) Write(data []byte) error {
+	err := ioutil.WriteFile(f.cacheFilePath, data, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (f *FileAccessor) WriteAtomic(data []byte) {
+	// Not implemented yet
+}
+
+func (f *FileAccessor) Delete() {
+
+}
diff --git a/internal/windows_persistence.go b/internal/windows_persistence.go
new file mode 100644
index 0000000..3980a0e
--- /dev/null
+++ b/internal/windows_persistence.go
@@ -0,0 +1,60 @@
+//go:build windows
+// +build windows
+
+package internal
+
+import (
+	"io/ioutil"
+	"os"
+	"runtime"
+
+	"github.com/billgraziano/dpapi"
+)
+
+type WindowsAccessor struct {
+	cacheFilePath string
+}
+
+func NewWindowsAccessor(cacheFilePath string) *WindowsAccessor {
+	return &WindowsAccessor{cacheFilePath: cacheFilePath}
+}
+
+func (w *WindowsAccessor) Read() ([]byte, error) {
+	var data []byte
+	file, err := os.Open(w.cacheFilePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	data, err = ioutil.ReadAll(file)
+	if err != nil {
+		return nil, err
+	}
+	if data != nil && len(data) != 0 && runtime.GOOS == "windows" {
+		data, err = dpapi.DecryptBytes(data)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return data, nil
+}
+
+func (w *WindowsAccessor) Write(data []byte) error {
+	data, err := dpapi.EncryptBytes(data)
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(w.cacheFilePath, data, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (w *WindowsAccessor) WriteAtomic(data []byte) {
+	// Not implemented yet
+}
+
+func (w *WindowsAccessor) Delete() {
+
+}
diff --git a/persistence_token_cache_access_aspect.go b/persistence_token_cache_access_aspect.go
new file mode 100644
index 0000000..92cab3f
--- /dev/null
+++ b/persistence_token_cache_access_aspect.go
@@ -0,0 +1,130 @@
+//go:build windows
+// +build windows
+
+package main
+
+import (
+	"log"
+	"os"
+	"time"
+
+	"github.com/AzureAD/microsoft-authentication-extensions-for-go/internal"
+	"github.com/AzureAD/microsoft-authentication-library-for-go/apps/cache"
+)
+
+type FileTokenCache struct {
+	lock                               CrossPlatLock
+	filename                           string
+	lastSeenCacheFileModifiedTimestamp time.Time
+	fileAccessor                       internal.FileAccessor
+}
+
+func NewFileCache(file string) *FileTokenCache {
+	os.Create(file)
+	lock, err := NewLock(file+".lock", 60, 100)
+	if err != nil {
+		return &FileTokenCache{}
+	}
+	return &FileTokenCache{
+		lock:                               lock,
+		filename:                           file,
+		fileAccessor:                       *internal.NewFileAccessor(file),
+		lastSeenCacheFileModifiedTimestamp: time.Time{},
+	}
+}
+
+func (t *FileTokenCache) Replace(cache cache.Unmarshaler, key string) {
+	info, err := os.Stat(t.filename)
+	if err != nil {
+		log.Println(err)
+	}
+	currentCacheFileModifiedTime := info.ModTime()
+	if currentCacheFileModifiedTime != t.lastSeenCacheFileModifiedTimestamp {
+		if err := t.lock.Lock(); err != nil {
+			log.Println(err)
+		}
+		defer t.lock.UnLock()
+		data, err := t.fileAccessor.Read()
+		if err != nil {
+			log.Println(err)
+		}
+		err = cache.Unmarshal(data)
+		if err != nil {
+			log.Println(err)
+		}
+	}
+}
+
+func (t *FileTokenCache) Export(cache cache.Marshaler, key string) {
+	if err := t.lock.Lock(); err != nil {
+		log.Println(err)
+	}
+	defer t.lock.UnLock()
+	data, err := cache.Marshal()
+	if err != nil {
+		log.Println(err)
+	}
+	t.fileAccessor.Write(data)
+	info, err := os.Stat(t.filename)
+	if err != nil {
+		log.Println(err)
+	}
+	t.lastSeenCacheFileModifiedTimestamp = info.ModTime()
+}
+
+type WindowsTokenCache struct {
+	lock                               CrossPlatLock
+	filename                           string
+	lastSeenCacheFileModifiedTimestamp time.Time
+	windowsAccessor                    internal.WindowsAccessor
+}
+
+func NewWindowsCache(file string) *WindowsTokenCache {
+	os.Create(file)
+	lock, err := NewLock(file+".lock", 60, 100)
+	if err != nil {
+		return &WindowsTokenCache{}
+	}
+	return &WindowsTokenCache{
+		lock:                               lock,
+		filename:                           file,
+		windowsAccessor:                    *internal.NewWindowsAccessor(file),
+		lastSeenCacheFileModifiedTimestamp: time.Time{},
+	}
+}
+
+func (t *WindowsTokenCache) Replace(cache cache.Unmarshaler, key string) {
+	info, err := os.Stat(t.filename)
+	if err != nil {
+		log.Println(err)
+	}
+	currentCacheFileModifiedTime := info.ModTime()
+	if currentCacheFileModifiedTime != t.lastSeenCacheFileModifiedTimestamp {
+		t.lock.Lock()
+		defer t.lock.UnLock()
+		data, err := t.windowsAccessor.Read()
+		if err != nil {
+			log.Println(err)
+		}
+		err = cache.Unmarshal(data)
+		if err != nil {
+			log.Println(err)
+		}
+	}
+}
+
+func (t *WindowsTokenCache) Export(cache cache.Marshaler, key string) {
+	t.lock.Lock()
+	defer t.lock.UnLock()
+	data, err := cache.Marshal()
+	if err != nil {
+		log.Println(err)
+	}
+	t.windowsAccessor.Write(data)
+
+	info, err := os.Stat(t.filename)
+	if err != nil {
+		log.Println(err)
+	}
+	t.lastSeenCacheFileModifiedTimestamp = info.ModTime()
+}