implement search providers memory cache

src/profile/search/memory.rs

@@ -0,0 +1,39 @@
+use super::database::Row;
+use std::cell::RefCell;
+
+/// Reduce disk usage by cache Bookmarks index in memory
+pub struct Memory {
+    index: RefCell<Vec<Row>>,
+}
+
+impl Memory {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn init() -> Self {
+        Self {
+            index: RefCell::new(Vec::new()),
+        }
+    }
+
+    // Actions
+
+    /// Add new record
+    pub fn push(&self, id: i64, query: String, is_default: bool) {
+        self.index.borrow_mut().push(Row {
+            id,
+            query,
+            is_default,
+        })
+    }
+
+    /// Clear all records
+    pub fn clear(&self) {
+        self.index.borrow_mut().clear()
+    }
+
+    /// Get record by `ID`
+    pub fn records(&self) -> Vec<Row> {
+        self.index.borrow().clone()
+    }
+}