first assignment

src/main/java/com/scaler/lld/design/assignments/builder/DatabaseConfigurationBuilder.java

@@ -1,6 +1,78 @@
 package com.scaler.lld.design.assignments.builder;
 
+import lombok.Getter;
+
 @WithBuilder
+@Getter
 public class DatabaseConfigurationBuilder {
 
+    private String databaseUrl;
+    private String username;
+    private String password;
+    private int maxConnections;
+    private boolean enableCache;
+    private boolean isReadOnly;
+
+    private DatabaseConfigurationBuilder(){
+    }
+
+    public static DBConfigBuilder builder(){
+        return new DBConfigBuilder();
+    }
+
+    public static class DBConfigBuilder {
+        public String databaseUrl;
+        private String username;
+        private String password;
+        private int maxConnections;
+        private boolean enableCache;
+        private boolean isReadOnly;
+
+        // Creating fluent interfaces for setter
+        public DBConfigBuilder setDatabaseUrl(String databaseUrl){
+            this.databaseUrl = databaseUrl;
+            return this;
+        }
+        public DBConfigBuilder setUsername(String username){
+            this.username = username;
+            return this;
+        }
+        public DBConfigBuilder setPassword(String password){
+            this.password = password;
+            return this;
+        }
+        public DBConfigBuilder setMaxConnections(int maxConnections){
+            this.maxConnections = maxConnections;
+            return this;
+        }
+        public DBConfigBuilder setEnableCache(boolean enableCache){
+            this.enableCache = enableCache;
+            return this;
+        }
+        public DBConfigBuilder setIsReadOnly(boolean isReadOnly){
+            this.isReadOnly = isReadOnly;
+            return this;
+        }
+
+        public DatabaseConfigurationBuilder build(){
+//            if (!isValid()){
+//                throw new IllegalArgumentException("Ivalid Database Configuration");
+//            }
+            DatabaseConfigurationBuilder databaseConfigurationBuilder = new DatabaseConfigurationBuilder();
+            databaseConfigurationBuilder.databaseUrl = this.databaseUrl;
+            databaseConfigurationBuilder.username = this.username;
+            databaseConfigurationBuilder.password = this.password;
+            databaseConfigurationBuilder.maxConnections = this.maxConnections;
+            databaseConfigurationBuilder.enableCache = this.enableCache;
+            databaseConfigurationBuilder.isReadOnly = this.isReadOnly;
+            return databaseConfigurationBuilder;
+        }
+
+//        public Boolean isValid(){
+//            if (this.databaseUrl == null){
+//                return false;
+//            }
+//            return true;
+//        }
+    }
 }

src/main/java/com/scaler/lld/design/assignments/prototype/Configuration.java

@@ -1,6 +1,6 @@
 package com.scaler.lld.design.assignments.prototype;
 
-public class Configuration {
+public class Configuration implements ClonableObject{
     private String themeColor;
     private Boolean autoSave;
     private String language;
@@ -46,4 +46,10 @@ public String getFontFamily() {
     public ConfigurationType getType() {
         return type;
     }
+
+    @Override
+    public Object cloneObject() {
+        Configuration configuration = new Configuration(this.themeColor, this.autoSave, this.language, this.darkMode, this.fontSize, this.fontFamily, this.type);
+        return configuration;
+    }
 }

src/main/java/com/scaler/lld/design/assignments/prototype/ConfigurationRegistry.java

@@ -0,0 +1,23 @@
+package com.scaler.lld.design.assignments.prototype;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class ConfigurationRegistry implements ConfigurationPrototypeRegistry{
+    private Map<ConfigurationType, Configuration> registy = new HashMap<>();
+    @Override
+    public void addPrototype(Configuration user) {
+        registy.put(user.getType(), user);
+    }
+
+    @Override
+    public Configuration getPrototype(ConfigurationType type) {
+        return registy.get(type);
+    }
+
+    @Override
+    public Configuration clone(ConfigurationType type) {
+        Configuration config = registy.get(type);
+        return (Configuration) config.cloneObject();
+    }
+}

src/main/java/com/scaler/lld/design/assignments/singleton/FileBasedConfigurationManagerImpl.java

@@ -1,50 +1,80 @@
 package com.scaler.lld.design.assignments.singleton;
 
+import java.util.HashMap;
+import java.util.Map;
+
 public class FileBasedConfigurationManagerImpl extends FileBasedConfigurationManager {
 
+    private static FileBasedConfigurationManager INSTANCE = null;
+//    public Map<String, String> config = new HashMap<>();
+//    public Map<String, > configDiffType = new HashMap<>();
+
+    private FileBasedConfigurationManagerImpl(){}
+
     @Override
     public String getConfiguration(String key) {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+//        // TODO Auto-generated method stub
+//        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        String rvalue = null;
+        if (properties.containsKey(key)){
+            rvalue = (String) properties.get(key);
+        }
+        return rvalue;
     }
 
     @Override
     public <T> T getConfiguration(String key, Class<T> type) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+//        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        T rValue = null;
+        if (properties.containsKey(key)){
+            String value =  (String) properties.get(key);
+            rValue = (T) convert(value, type);
+        }
+        return rValue;
     }
 
     @Override
     public void setConfiguration(String key, String value) {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+//        // TODO Auto-generated method stub
+//        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        properties.put(key, value);
     }
 
     @Override
     public <T> void setConfiguration(String key, T value) {
         // TODO Auto-generated method stub
         throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+
     }
 
     @Override
     public void removeConfiguration(String key) {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+//        // TODO Auto-generated method stub
+//        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+        properties.remove(key);
     }
 
     @Override
     public void clear() {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'clear'");
+//        // TODO Auto-generated method stub
+//        throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        properties.clear();
     }
 
     public static FileBasedConfigurationManager getInstance() {
-        // TODO Auto-generated method stub
-        return null;
+        if (INSTANCE == null){
+            synchronized (FileBasedConfigurationManagerImpl.class){
+                if (INSTANCE == null){
+                    INSTANCE = new FileBasedConfigurationManagerImpl();
+                }
+            }
+        }
+        return INSTANCE;
     }
 
     public static void resetInstance() {
-        // TODO Auto-generated method stub
+        INSTANCE = null;
     }
 
 }