use an in memory store for containers

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

oci/store.go

@@ -0,0 +1,28 @@
+package oci
+
+// StoreFilter defines a function to filter
+// container in the store.
+type StoreFilter func(*Container) bool
+
+// StoreReducer defines a function to
+// manipulate containers in the store
+type StoreReducer func(*Container)
+
+// Store defines an interface that
+// any container store must implement.
+type Store interface {
+	// Add appends a new container to the store.
+	Add(string, *Container)
+	// Get returns a container from the store by the identifier it was stored with.
+	Get(string) *Container
+	// Delete removes a container from the store by the identifier it was stored with.
+	Delete(string)
+	// List returns a list of containers from the store.
+	List() []*Container
+	// Size returns the number of containers in the store.
+	Size() int
+	// First returns the first container found in the store by a given filter.
+	First(StoreFilter) *Container
+	// ApplyAll calls the reducer function with every container in the store.
+	ApplyAll(StoreReducer)
+}