Add SyncStore which implements the Storer interface

SyncStore implements the Storer interface and supplies a NewSyncStore
factory function.

- Uuid increment is handled internally by SyncStore Create
- Read will return an empty Puppy struct if provided uuid doesn't exist
- Update returns a bool whether a matching identifier was modified
- Destroy returns a bool whether a matching identifier was modified

Lab 06 (#537)

06_puppy/patrickmarabeas/store_test.go

@@ -83,4 +83,5 @@ func (suite *StoreSuite) TestIdIncrementOnDelete() {
 
 func TestStore(t *testing.T) {
 	suite.Run(t, &StoreSuite{store: NewMapStore()})
+	suite.Run(t, &StoreSuite{store: NewSyncStore()})
 }

06_puppy/patrickmarabeas/syncStore.go

@@ -0,0 +1,50 @@
+package main
+
+// NewSyncStore returns a pointer to a new instance of the SyncStore struct which implements the Storer interface.
+func NewSyncStore() Storer {
+	return &SyncStore{
+		uuid: 0,
+	}
+}
+
+// Create increments the uuid and adds the provided Puppy struct to the store with this identifier.
+func (store *SyncStore) Create(puppy Puppy) int {
+	puppy.ID = store.uuid
+	store.Store(puppy.ID, puppy)
+	store.uuid++
+
+	return puppy.ID
+}
+
+// Read returns the puppy matching the provided uuid.
+// An empty Puppy struct is returned if the identifier does not exist.
+func (store *SyncStore) Read(id int) Puppy {
+	if value, ok := store.Load(id); ok {
+		return value.(Puppy)
+	}
+
+	return Puppy{}
+}
+
+// Update modifies the puppy matching the provided uuid in the store with the provided Puppy struct.
+// It returns a bool whether a matching identifier was modified or not.
+func (store *SyncStore) Update(id int, puppy Puppy) bool {
+	if _, ok := store.Load(id); !ok {
+		return false
+	}
+
+	puppy.ID = id
+	store.Store(id, puppy)
+	return true
+}
+
+// Destroy removes the puppy matching the provided uuid from the store.
+// It returns a bool whether a matching identifier was deleted or not.
+func (store *SyncStore) Destroy(id int) bool {
+	if _, ok := store.Load(id); !ok {
+		return false
+	}
+
+	store.Delete(id)
+	return true
+}

06_puppy/patrickmarabeas/types.go

@@ -1,5 +1,9 @@
 package main
 
+import (
+	"sync"
+)
+
 type Puppy struct {
 	ID    int
 	Breed string
@@ -18,3 +22,8 @@ type MapStore struct {
 	uuid  int
 	store map[int]Puppy
 }
+
+type SyncStore struct {
+	uuid int
+	sync.Map
+}