Get maker reagent from PG db, rework processor (no statics)

src/main/java/database/maker/MakerInfoProvider.java

@@ -0,0 +1,28 @@
+package database.maker;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class MakerInfoProvider {
+    private final MakerDao makerDao;
+    private final Map<Integer, MakerReagent> reagents = new ConcurrentHashMap<>();
+
+    public MakerInfoProvider(MakerDao makerDao) {
+        this.makerDao = makerDao;
+    }
+
+    public Optional<MakerReagent> getMakerReagent(int itemId) {
+        final MakerReagent cachedReagent = reagents.get(itemId);
+        if (cachedReagent != null) {
+            return Optional.of(cachedReagent);
+        }
+
+        final Optional<MakerReagent> reagentFromDb = makerDao.getReagent(itemId);
+        if (reagentFromDb.isEmpty()) {
+            return Optional.empty();
+        }
+        reagents.put(itemId, reagentFromDb.get());
+        return reagentFromDb;
+    }
+}