feat: 메모리 캐싱 프로토콜, 실 구현체 구현

Author: opficdev

Application/DevLogData/Sources/Protocol/MemoryCacheStore.swift

@@ -0,0 +1,13 @@
+//
+//  MemoryCacheStore.swift
+//  DevLogData
+//
+//  Created by opfic on 6/9/26.
+//
+
+import Foundation
+
+public protocol MemoryCacheStore {
+    func value<T: Codable>(forKey key: String) -> T?
+    func setValue<T: Codable>(_ value: T?, forKey key: String)
+}

Application/DevLogPersistence/Sources/Cache/MemoryCacheStoreImpl.swift

@@ -0,0 +1,38 @@
+//
+//  MemoryCacheStoreImpl.swift
+//  DevLogPersistence
+//
+//  Created by opfic on 6/9/26.
+//
+
+import Foundation
+import DevLogData
+
+final class MemoryCacheStoreImpl: MemoryCacheStore {
+    private let queue = DispatchQueue(
+        label: "devlog.memory-cache-store",
+        qos: .utility
+    )
+    private var values = [String: Data]()
+
+    func value<T: Codable>(forKey key: String) -> T? {
+        queue.sync {
+            let decoder = JSONDecoder()
+            guard let data = self.values[key] else { return nil }
+            return try? decoder.decode(T.self, from: data)
+        }
+    }
+
+    func setValue<T: Codable>(_ value: T?, forKey key: String) {
+        queue.sync {
+            let encoder = JSONEncoder()
+            guard let value else {
+                self.values.removeValue(forKey: key)
+                return
+            }
+
+            guard let data = try? encoder.encode(value) else { return }
+            self.values[key] = data
+        }
+    }
+}

Application/DevLogPersistence/Sources/PersistenceAssembler.swift

@@ -17,6 +17,10 @@ public final class PersistenceAssembler: Assembler {
             UserDefaultsStoreImpl()
         }
 
+        container.register(MemoryCacheStore.self) {
+            MemoryCacheStoreImpl()
+        }
+
         container.register(ThemeStore.self) {
             ThemeStoreImpl()
         }