From ff5a96796c815f31bb3bf32d068568d04067ccad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Mon, 24 Feb 2025 20:24:25 +0900
Subject: [PATCH 1/9] [Chore] : delete mock file

---
 sdk/java-sdk/.idea/gradle.xml                 |  17 --
 sdk/java-sdk/.idea/misc.xml                   |  10 -
 sdk/java-sdk/.idea/vcs.xml                    |   7 -
 sdk/java-sdk/.idea/workspace.xml              | 185 ------------------
 .../src/main/java/org/lightswitch/Main.java   |   7 -
 .../java/org/lightswitch/sdk/client/.gitkeep  |   0
 .../java/org/lightswitch/sdk/config/.gitkeep  |   0
 .../java/org/lightswitch/sdk/model/.gitkeep   |   0
 8 files changed, 226 deletions(-)
 delete mode 100644 sdk/java-sdk/.idea/gradle.xml
 delete mode 100644 sdk/java-sdk/.idea/misc.xml
 delete mode 100644 sdk/java-sdk/.idea/vcs.xml
 delete mode 100644 sdk/java-sdk/.idea/workspace.xml
 delete mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/Main.java
 delete mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/.gitkeep
 delete mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/.gitkeep
 delete mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/.gitkeep

diff --git a/sdk/java-sdk/.idea/gradle.xml b/sdk/java-sdk/.idea/gradle.xml
deleted file mode 100644
index 2a65317..0000000
--- a/sdk/java-sdk/.idea/gradle.xml
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GradleMigrationSettings" migrationVersion="1" />
-  <component name="GradleSettings">
-    <option name="linkedExternalProjectsSettings">
-      <GradleProjectSettings>
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleHome" value="" />
-        <option name="modules">
-          <set>
-            <option value="$PROJECT_DIR$" />
-          </set>
-        </option>
-      </GradleProjectSettings>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/sdk/java-sdk/.idea/misc.xml b/sdk/java-sdk/.idea/misc.xml
deleted file mode 100644
index b9d0bed..0000000
--- a/sdk/java-sdk/.idea/misc.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="FrameworkDetectionExcludesConfiguration">
-    <file type="web" url="file://$PROJECT_DIR$" />
-  </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="corretto-11" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/out" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/sdk/java-sdk/.idea/vcs.xml b/sdk/java-sdk/.idea/vcs.xml
deleted file mode 100644
index fdf1fc8..0000000
--- a/sdk/java-sdk/.idea/vcs.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/sdk/java-sdk/.idea/workspace.xml b/sdk/java-sdk/.idea/workspace.xml
deleted file mode 100644
index 8befbb3..0000000
--- a/sdk/java-sdk/.idea/workspace.xml
+++ /dev/null
@@ -1,185 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="AutoImportSettings">
-    <option name="autoReloadType" value="SELECTIVE" />
-  </component>
-  <component name="ChangeListManager">
-    <list default="true" id="93157826-81e6-47b9-9661-d559d0d10a15" name="변경" comment="" />
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="ExternalProjectsData">
-    <projectState path="$PROJECT_DIR$">
-      <ProjectState />
-    </projectState>
-  </component>
-  <component name="ExternalProjectsManager">
-    <system id="GRADLE">
-      <state>
-        <task path="$PROJECT_DIR$">
-          <activation />
-        </task>
-        <projects_view>
-          <tree_state>
-            <expand>
-              <path>
-                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
-                <item name="java-sdk" type="f1a62948:ProjectNode" />
-              </path>
-              <path>
-                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
-                <item name="java-sdk" type="f1a62948:ProjectNode" />
-                <item name="Tasks" type="e4a08cd1:TasksNode" />
-              </path>
-              <path>
-                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
-                <item name="java-sdk" type="f1a62948:ProjectNode" />
-                <item name="Tasks" type="e4a08cd1:TasksNode" />
-                <item name="build" type="c8890929:TasksNode$1" />
-              </path>
-            </expand>
-            <select />
-          </tree_state>
-        </projects_view>
-      </state>
-    </system>
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-    <option name="ROOT_SYNC" value="SYNC" />
-  </component>
-  <component name="KubernetesApiPersistence">{}</component>
-  <component name="KubernetesApiProvider">{
-  &quot;isMigrated&quot;: true
-}</component>
-  <component name="ProjectColorInfo">{
-  &quot;associatedIndex&quot;: 0
-}</component>
-  <component name="ProjectId" id="2sO19BFqD4jkn1ZTKKvs5YpzDJ1" />
-  <component name="ProjectLevelVcsManager" settingsEditedManually="true">
-    <ConfirmationsSetting value="1" id="Add" />
-  </component>
-  <component name="ProjectViewState">
-    <option name="showLibraryContents" value="true" />
-  </component>
-  <component name="PropertiesComponent"><![CDATA[{
-  "keyToString": {
-    "Gradle.java-sdk [build].executor": "Run",
-    "Gradle.java-sdk [clean].executor": "Run",
-    "RunOnceActivity.ShowReadmeOnStart": "true",
-    "git-widget-placeholder": "<알 수 없음>",
-    "kotlin-language-version-configured": "true",
-    "node.js.detected.package.eslint": "true",
-    "node.js.detected.package.tslint": "true",
-    "node.js.selected.package.eslint": "(autodetect)",
-    "node.js.selected.package.tslint": "(autodetect)",
-    "nodejs_package_manager_path": "npm",
-    "project.structure.last.edited": "모듈",
-    "project.structure.proportion": "0.15",
-    "project.structure.side.proportion": "0.2",
-    "settings.editor.selected.configurable": "project.propVCSSupport.DirectoryMappings",
-    "vue.rearranger.settings.migration": "true"
-  }
-}]]></component>
-  <component name="RunManager" selected="Gradle.java-sdk [build]">
-    <configuration name="java-sdk [build]" type="GradleRunConfiguration" factoryName="Gradle" temporary="true">
-      <ExternalSystemSettings>
-        <option name="executionName" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="externalSystemIdString" value="GRADLE" />
-        <option name="scriptParameters" />
-        <option name="taskDescriptions">
-          <list />
-        </option>
-        <option name="taskNames">
-          <list>
-            <option value="build" />
-          </list>
-        </option>
-        <option name="vmOptions" />
-      </ExternalSystemSettings>
-      <ExternalSystemDebugServerProcess>true</ExternalSystemDebugServerProcess>
-      <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
-      <DebugAllEnabled>false</DebugAllEnabled>
-      <RunAsTest>false</RunAsTest>
-      <method v="2" />
-    </configuration>
-    <configuration name="java-sdk [clean]" type="GradleRunConfiguration" factoryName="Gradle" temporary="true">
-      <ExternalSystemSettings>
-        <option name="executionName" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="externalSystemIdString" value="GRADLE" />
-        <option name="scriptParameters" />
-        <option name="taskDescriptions">
-          <list />
-        </option>
-        <option name="taskNames">
-          <list>
-            <option value="clean" />
-          </list>
-        </option>
-        <option name="vmOptions" />
-      </ExternalSystemSettings>
-      <ExternalSystemDebugServerProcess>true</ExternalSystemDebugServerProcess>
-      <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
-      <DebugAllEnabled>false</DebugAllEnabled>
-      <RunAsTest>false</RunAsTest>
-      <method v="2" />
-    </configuration>
-    <recent_temporary>
-      <list>
-        <item itemvalue="Gradle.java-sdk [build]" />
-        <item itemvalue="Gradle.java-sdk [clean]" />
-      </list>
-    </recent_temporary>
-  </component>
-  <component name="SharedIndexes">
-    <attachedChunks>
-      <set>
-        <option value="bundled-jdk-9f38398b9061-18abd8497189-intellij.indexing.shared.core-IU-241.14494.240" />
-        <option value="bundled-js-predefined-1d06a55b98c1-74d2a5396914-JavaScript-IU-241.14494.240" />
-      </set>
-    </attachedChunks>
-  </component>
-  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="애플리케이션 수준" UseSingleDictionary="true" transferred="true" />
-  <component name="TaskManager">
-    <task active="true" id="Default" summary="디폴트 작업">
-      <changelist id="93157826-81e6-47b9-9661-d559d0d10a15" name="변경" comment="" />
-      <created>1738311656309</created>
-      <option name="number" value="Default" />
-      <option name="presentableId" value="Default" />
-      <updated>1738311656309</updated>
-      <workItem from="1738311657376" duration="1973000" />
-      <workItem from="1738577948591" duration="2592000" />
-    </task>
-    <servers />
-  </component>
-  <component name="TypeScriptGeneratedFilesManager">
-    <option name="version" value="3" />
-  </component>
-  <component name="Vcs.Log.Tabs.Properties">
-    <option name="TAB_STATES">
-      <map>
-        <entry key="MAIN">
-          <value>
-            <State>
-              <option name="FILTERS">
-                <map>
-                  <entry key="branch">
-                    <value>
-                      <list>
-                        <option value="origin/feat/java-sdk-setup" />
-                      </list>
-                    </value>
-                  </entry>
-                </map>
-              </option>
-            </State>
-          </value>
-        </entry>
-      </map>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/Main.java b/sdk/java-sdk/src/main/java/org/lightswitch/Main.java
deleted file mode 100644
index 0c9cbc8..0000000
--- a/sdk/java-sdk/src/main/java/org/lightswitch/Main.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package org.lightswitch;
-
-public class Main {
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
-    }
-}
\ No newline at end of file
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/.gitkeep b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/.gitkeep b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/.gitkeep b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/.gitkeep
deleted file mode 100644
index e69de29..0000000

From 2bf5ea12f43f90ac545ef1a3a169ed5e704b04a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Mon, 24 Feb 2025 20:25:16 +0900
Subject: [PATCH 2/9] [Add] implementation LightSwitchConfig

---
 .../sdk/client/LightSwitchClient.java         | 16 ++++
 .../sdk/client/LightSwitchClientImpl.java     | 92 +++++++++++++++++++
 .../sdk/config/LightSwitchConfig.java         | 88 ++++++++++++++++++
 3 files changed, 196 insertions(+)
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClient.java
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClientImpl.java
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java

diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClient.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClient.java
new file mode 100644
index 0000000..081e273
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClient.java
@@ -0,0 +1,16 @@
+package org.lightswitch.sdk.client;
+
+import org.lightswitch.sdk.user.LightSwitchUser;
+
+public interface LightSwitchClient {
+
+    boolean getBooleanFlag(String key, boolean defaultValue, LightSwitchUser user);
+
+    int getIntFlag(String key, int defaultValue, LightSwitchUser user);
+
+    String getStringFlag(String key, String defaultValue, LightSwitchUser user);
+
+    void destroy();
+
+    boolean isEnabled(String key, LightSwitchUser user);
+}
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClientImpl.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClientImpl.java
new file mode 100644
index 0000000..4791fea
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/client/LightSwitchClientImpl.java
@@ -0,0 +1,92 @@
+package org.lightswitch.sdk.client;
+
+import org.lightswitch.sdk.exception.LightSwitchCastException;
+import org.lightswitch.sdk.model.FeatureFlag;
+import org.lightswitch.sdk.user.LightSwitchUser;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class LightSwitchClientImpl implements LightSwitchClient {
+
+    // TODO develop FeatureFlagRepository, httpClient, SSEClient
+    private final Map<String, FeatureFlag> featureFlags; // Mock
+
+    public LightSwitchClientImpl() {
+        // Mock data
+        this.featureFlags = new HashMap<>();
+
+        featureFlags.put("new-dashboard", new FeatureFlag(
+                "new-dashboard",
+                false, // default
+                Map.of(
+                        Map.of("region", "US"), true // active "US" user
+                )
+        ));
+
+        featureFlags.put("beta-feature", new FeatureFlag(
+                "beta-feature",
+                false,
+                Map.of(
+                        Map.of("plan", "premium"), true // active "premium" user
+                )
+        ));
+
+        featureFlags.put("discount", new FeatureFlag(
+                "discount",
+                0, // default sale rates : 0%
+                Map.of(
+                        Map.of("region", "US"), 100,  // US user 100% sale
+                        Map.of("region", "EU"), 50   // EU user 50% sale
+                )
+        ));
+    }
+
+    private FeatureFlag getMockFlag(String key) {
+        return featureFlags.get(key);
+    }
+
+    private <T> T castValue(String key, Object value, Class<T> expectedType) {
+        if (!expectedType.isInstance(value)) {
+            throw new LightSwitchCastException(key, value, expectedType);
+        }
+        return expectedType.cast(value);
+    }
+
+    @Override
+    public boolean getBooleanFlag(String key, boolean defaultValue, LightSwitchUser user) {
+        FeatureFlag flag = getMockFlag(key);
+        if (flag == null) return defaultValue;
+
+        Object value = flag.evaluate(user);
+        return castValue(key, value, Boolean.class);
+    }
+
+    @Override
+    public int getIntFlag(String key, int defaultValue, LightSwitchUser user) {
+        FeatureFlag flag = getMockFlag(key);
+        if (flag == null) return defaultValue;
+
+        Object value = flag.evaluate(user);
+        return castValue(key, value, Integer.class);
+    }
+
+    @Override
+    public String getStringFlag(String key, String defaultValue, LightSwitchUser user) {
+        FeatureFlag flag = getMockFlag(key);
+        if (flag == null) return defaultValue;
+
+        Object value = flag.evaluate(user);
+        return castValue(key, value, String.class);
+    }
+
+    @Override
+    public void destroy() {
+        featureFlags.clear();
+    }
+
+    @Override
+    public boolean isEnabled(String key, LightSwitchUser user) {
+        return getBooleanFlag(key, false, user);
+    }
+}
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java
new file mode 100644
index 0000000..620e424
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java
@@ -0,0 +1,88 @@
+package org.lightswitch.sdk.config;
+
+import org.lightswitch.sdk.exception.LightSwitchConfigException;
+
+public class LightSwitchConfig {
+
+    private final String serverUrl;
+    private final boolean useCache;
+    private final String sdkKey;
+    private final int reconnectDelay;
+    private final int connectionTimeout;
+
+    private LightSwitchConfig(Builder builder) {
+        this.serverUrl = builder.serverUrl;
+        this.useCache = builder.useCache;
+        this.sdkKey = builder.sdkKey;
+        this.reconnectDelay = builder.reconnectDelay;
+        this.connectionTimeout = builder.connectionTimeout;
+    }
+
+    public static class Builder {
+        private String serverUrl;
+        private boolean useCache = true;
+        private String sdkKey;
+        private int reconnectDelay = 5000;
+        private int connectionTimeout = 10000;
+
+        public Builder serverUrl(String serverUrl) throws LightSwitchConfigException {
+
+            if (serverUrl == null) {
+                throw new LightSwitchConfigException("Server URL cannot be null");
+            }
+
+            this.serverUrl = serverUrl;
+            return this;
+        }
+
+        public Builder useCache(boolean useCache) {
+            this.useCache = useCache;
+            return this;
+        }
+
+        public Builder sdkKey(String sdkKey) {
+            this.sdkKey = sdkKey;
+            return this;
+        }
+
+        public Builder reconnectDelay(int reconnectDelay) {
+            this.reconnectDelay = reconnectDelay;
+            return this;
+        }
+
+        public Builder connectionTimeout(int connectionTimeout) {
+            if (connectionTimeout < 0) {
+                //TODO automatic default setting log creation
+                return this;
+            }
+
+            this.connectionTimeout = connectionTimeout;
+            return this;
+        }
+
+        public LightSwitchConfig build() {
+            return new LightSwitchConfig(this);
+        }
+    }
+
+
+    public String getServerUrl() {
+        return serverUrl;
+    }
+
+    public boolean isUseCache() {
+        return useCache;
+    }
+
+    public String getSdkKey() {
+        return sdkKey;
+    }
+
+    public int getReconnectDelay() {
+        return reconnectDelay;
+    }
+
+    public int getConnectionTimeout() {
+        return connectionTimeout;
+    }
+}

From 3c9da80947280071726987c5f34b35fbd6f9dadf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Mon, 24 Feb 2025 20:26:06 +0900
Subject: [PATCH 3/9] [Add] : implementationf feature flag model

---
 .../lightswitch/sdk/model/FeatureFlag.java    | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/FeatureFlag.java

diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/FeatureFlag.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/FeatureFlag.java
new file mode 100644
index 0000000..5dbc6f6
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/model/FeatureFlag.java
@@ -0,0 +1,56 @@
+package org.lightswitch.sdk.model;
+
+import org.lightswitch.sdk.user.LightSwitchUser;
+
+import java.util.Collections;
+import java.util.Map;
+
+public class FeatureFlag {
+
+    private final String key;
+    private final Object defaultValue;
+    private final Map<Map<String, String>, Object> filters; // filtering rules
+
+    public FeatureFlag(String key, Object defaultValue, Map<Map<String, String>, Object> filters) {
+        this.key = key;
+        this.defaultValue = defaultValue;
+        this.filters = filters != null ? filters : Collections.emptyMap();
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public Object getDefaultValue() {
+        return defaultValue;
+    }
+
+    public Map<Map<String, String>, Object> getConditions() {
+        return Collections.unmodifiableMap(filters);
+    }
+
+    /**
+     * Find and return appropriate flag values based on user properties
+     */
+    public Object evaluate(LightSwitchUser user) {
+        for (Map.Entry<Map<String, String>, Object> entry : filters.entrySet()) {
+            Map<String, String> conditions = entry.getKey();
+            boolean match = conditions.entrySet().stream()
+                    .allMatch(cond -> user.getAttributes().getOrDefault(cond.getKey(), "").equals(cond.getValue()));
+
+            if (match) {
+                return entry.getValue();
+            }
+        }
+        return defaultValue;
+    }
+
+    @Override
+    public String toString() {
+        return "FeatureFlag{" +
+                "key='" + key + '\'' +
+                ", defaultValue=" + defaultValue +
+                ", filters=" + filters +
+                '}';
+    }
+}

From fd703975f5337c547f641fb8e7c8f2531967b980 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Mon, 24 Feb 2025 20:26:51 +0900
Subject: [PATCH 4/9] [Add] : implementation LightSwitch User

---
 .../lightswitch/sdk/user/LightSwitchUser.java | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/user/LightSwitchUser.java

diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/user/LightSwitchUser.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/user/LightSwitchUser.java
new file mode 100644
index 0000000..d09e0a3
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/user/LightSwitchUser.java
@@ -0,0 +1,38 @@
+package org.lightswitch.sdk.user;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public class LightSwitchUser {
+
+    private final String userId;
+    private final Map<String, String> attributes;
+
+    public LightSwitchUser(String userId) {
+        this.userId = userId;
+        this.attributes = new HashMap<>();
+    }
+
+    public LightSwitchUser(String userId, Map<String, String> attributes) {
+        this.userId = userId;
+        this.attributes = new HashMap<>(attributes);
+    }
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public LightSwitchUser addAttribute(String key, String value) {
+        this.attributes.put(key, value);
+        return this;
+    }
+
+    public String getAttribute(String key) {
+        return attributes.get(key);
+    }
+
+    public Map<String, String> getAttributes() {
+        return Collections.unmodifiableMap(attributes);
+    }
+}

From 8d7b073abceb7b77099417b5daa5d6b6423f2435 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Mon, 24 Feb 2025 20:27:43 +0900
Subject: [PATCH 5/9] [Feat] : test code

---
 .../sdk/client/LightSwitchClientImplTest.java | 78 +++++++++++++++++++
 .../sdk/config/LightSwitchConfigTest.java     | 57 ++++++++++++++
 2 files changed, 135 insertions(+)
 create mode 100644 sdk/java-sdk/src/test/java/org/lightswitch/sdk/client/LightSwitchClientImplTest.java
 create mode 100644 sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java

diff --git a/sdk/java-sdk/src/test/java/org/lightswitch/sdk/client/LightSwitchClientImplTest.java b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/client/LightSwitchClientImplTest.java
new file mode 100644
index 0000000..5ad6ef1
--- /dev/null
+++ b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/client/LightSwitchClientImplTest.java
@@ -0,0 +1,78 @@
+package org.lightswitch.sdk.client;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.lightswitch.sdk.exception.LightSwitchCastException;
+import org.lightswitch.sdk.user.LightSwitchUser;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class LightSwitchClientImplTest {
+
+    private LightSwitchClient client;
+
+    @BeforeEach
+    public void setUp() {
+        client = new LightSwitchClientImpl();
+    }
+
+    @Test
+    public void testBooleanFlag_withMatchingCondition() {
+        LightSwitchUser user = new LightSwitchUser("user1").addAttribute("region", "US");
+        boolean flagValue = client.getBooleanFlag("new-dashboard", false, user);
+        assertTrue(flagValue, "US user must be returned TRUE flag for new-dashboard");
+    }
+
+    @Test
+    public void testBooleanFlag_withoutMatchingCondition() {
+        LightSwitchUser user = new LightSwitchUser("user2").addAttribute("region", "EU");
+        boolean flagValue = client.getBooleanFlag("new-dashboard", false, user);
+        assertFalse(flagValue, "EU user must be returned FALSE flag for new-dashboard");
+    }
+
+    @Test
+    public void testIntFlag_discount_US() {
+        LightSwitchUser user = new LightSwitchUser("user1").addAttribute("region", "US");
+        int discount = client.getIntFlag("discount", 0, user);
+        assertEquals(100, discount, "US user must be returned 100 flag for discount rate");
+    }
+
+    @Test
+    public void testIntFlag_discount_EU() {
+        LightSwitchUser user = new LightSwitchUser("user2").addAttribute("region", "EU");
+        int discount = client.getIntFlag("discount", 0, user);
+        assertEquals(50, discount, "EU user must be returned 50 flag for discount rate");
+    }
+
+    @Test
+    public void testIntFlag_discount_default() {
+        LightSwitchUser user = new LightSwitchUser("user3");
+        int discount = client.getIntFlag("discount", 0, user);
+        assertEquals(0, discount, "It must be return 0 which is default flag");
+    }
+
+    @Test
+    public void testCastException_onWrongType() {
+        LightSwitchUser user = new LightSwitchUser("user1").addAttribute("region", "US");
+        Exception exception = assertThrows(LightSwitchCastException.class, () -> {
+            client.getBooleanFlag("discount", false, user);
+        });
+        String expectedMessage = "expected type Boolean";
+        assertTrue(exception.getMessage().contains(expectedMessage));
+    }
+
+    @Test
+    public void testIsEnabled() {
+        LightSwitchUser user = new LightSwitchUser("user1").addAttribute("region", "US");
+        boolean enabled = client.isEnabled("new-dashboard", user);
+        assertTrue(enabled);
+    }
+
+    @Test
+    public void testDestroy_clearsFlags() {
+        LightSwitchUser user = new LightSwitchUser("user1").addAttribute("region", "US");
+        client.destroy();
+        boolean flagValue = client.getBooleanFlag("new-dashboard", false, user);
+        assertFalse(flagValue, "It must return default flag after destroy");
+    }
+}
\ No newline at end of file
diff --git a/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java
new file mode 100644
index 0000000..9cdcc4f
--- /dev/null
+++ b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java
@@ -0,0 +1,57 @@
+package org.lightswitch.sdk.config;
+
+import org.junit.jupiter.api.Test;
+import org.lightswitch.sdk.exception.LightSwitchConfigException;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class LightSwitchConfigTest {
+
+    @Test
+    void testValidConfig() throws LightSwitchConfigException {
+        LightSwitchConfig config = new LightSwitchConfig.Builder()
+                .serverUrl("https://api.lightswitch.com")
+                .sdkKey("test-key")
+                .useCache(false)
+                .reconnectDelay(3000)
+                .connectionTimeout(15000)
+                .build();
+
+        assertEquals("https://api.lightswitch.com", config.getServerUrl());
+        assertEquals("test-key", config.getSdkKey());
+        assertFalse(config.isUseCache());
+        assertEquals(3000, config.getReconnectDelay());
+        assertEquals(15000, config.getConnectionTimeout());
+    }
+
+    @Test
+    void testDefaultValues() throws LightSwitchConfigException {
+        LightSwitchConfig config = new LightSwitchConfig.Builder()
+                .serverUrl("https://api.lightswitch.com")
+                .sdkKey("test-key")
+                .build();
+
+        assertTrue(config.isUseCache());
+        assertEquals(5000, config.getReconnectDelay());
+        assertEquals(10000, config.getConnectionTimeout());
+    }
+
+    @Test
+    void testNegativeTimeoutUsesDefault() throws LightSwitchConfigException {
+        LightSwitchConfig config = new LightSwitchConfig.Builder()
+                .serverUrl("https://api.lightswitch.com")
+                .sdkKey("test-key")
+                .connectionTimeout(-5)
+                .build();
+
+        assertEquals(10000, config.getConnectionTimeout());
+    }
+
+    @Test
+    void testNullServerUrlThrowsException() {
+        Exception exception = assertThrows(LightSwitchConfigException.class, () ->
+                new LightSwitchConfig.Builder().serverUrl(null).sdkKey("test-key").build()
+        );
+        assertEquals("Server URL cannot be null", exception.getMessage());
+    }
+}
\ No newline at end of file

From dcf84792f631cbf1b05b251a7e1cb3c1c84954f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Fri, 28 Feb 2025 12:34:23 +0900
Subject: [PATCH 6/9] [Feat] : add test code

---
 .../sdk/model/FeatureFlagTest.java            | 54 +++++++++++++++++++
 .../sdk/user/LightSwitchUserTest.java         | 29 ++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 sdk/java-sdk/src/test/java/org/lightswitch/sdk/model/FeatureFlagTest.java
 create mode 100644 sdk/java-sdk/src/test/java/org/lightswitch/sdk/user/LightSwitchUserTest.java

diff --git a/sdk/java-sdk/src/test/java/org/lightswitch/sdk/model/FeatureFlagTest.java b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/model/FeatureFlagTest.java
new file mode 100644
index 0000000..8ab9071
--- /dev/null
+++ b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/model/FeatureFlagTest.java
@@ -0,0 +1,54 @@
+package org.lightswitch.sdk.model;
+
+import org.junit.jupiter.api.Test;
+import org.lightswitch.sdk.user.LightSwitchUser;
+
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class FeatureFlagTest {
+
+    @Test
+    public void testEvaluate_returnsVariantValue_whenConditionMatches() {
+        FeatureFlag flag = new FeatureFlag(
+                "discount",
+                0,
+                Map.of(
+                        Map.of("region", "US"), 100,
+                        Map.of("region", "EU"), 50
+                )
+        );
+
+        LightSwitchUser userUS = new LightSwitchUser("user1").addAttribute("region", "US");
+        Object result = flag.evaluate(userUS);
+        assertEquals(100, result);
+
+        LightSwitchUser userEU = new LightSwitchUser("user2").addAttribute("region", "EU");
+        result = flag.evaluate(userEU);
+        assertEquals(50, result);
+    }
+
+    @Test
+    public void testEvaluate_returnsDefaultValue_whenNoConditionMatches() {
+        FeatureFlag flag = new FeatureFlag(
+                "discount",
+                0,
+                Map.of(
+                        Map.of("region", "US"), 100
+                )
+        );
+        LightSwitchUser user = new LightSwitchUser("user3").addAttribute("region", "EU");
+        Object result = flag.evaluate(user);
+        assertEquals(0, result);
+    }
+
+    @Test
+    public void testEvaluate_returnsDefaultValue_whenNoConditionsDefined() {
+        FeatureFlag flag = new FeatureFlag("new-dashboard", false, null);
+        LightSwitchUser user = new LightSwitchUser("user1");
+        Object result = flag.evaluate(user);
+        assertEquals(false, result);
+    }
+
+}
\ No newline at end of file
diff --git a/sdk/java-sdk/src/test/java/org/lightswitch/sdk/user/LightSwitchUserTest.java b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/user/LightSwitchUserTest.java
new file mode 100644
index 0000000..fe09558
--- /dev/null
+++ b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/user/LightSwitchUserTest.java
@@ -0,0 +1,29 @@
+package org.lightswitch.sdk.user;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class LightSwitchUserTest {
+
+    @Test
+    public void testUserAttributesAdditionAndRetrieval() {
+        LightSwitchUser user = new LightSwitchUser("user1");
+        user.addAttribute("region", "US").addAttribute("plan", "premium");
+
+        assertEquals("US", user.getAttribute("region"));
+        assertEquals("premium", user.getAttribute("plan"));
+    }
+
+    @Test
+    public void testGetAttributesReturnsImmutableMap() {
+        LightSwitchUser user = new LightSwitchUser("user1");
+        user.addAttribute("region", "US");
+
+        Map<String, String> attributes = user.getAttributes();
+        assertThrows(UnsupportedOperationException.class, () -> attributes.put("plan", "basic"));
+    }
+}
\ No newline at end of file

From d6c661bddee55da8ff865ff1400765f0ba1761a8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Fri, 28 Feb 2025 12:51:31 +0900
Subject: [PATCH 7/9] [Fix] delete useCache

---
 .../lightswitch/sdk/config/LightSwitchConfig.java    | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java
index 620e424..ebae23c 100644
--- a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/config/LightSwitchConfig.java
@@ -5,14 +5,12 @@
 public class LightSwitchConfig {
 
     private final String serverUrl;
-    private final boolean useCache;
     private final String sdkKey;
     private final int reconnectDelay;
     private final int connectionTimeout;
 
     private LightSwitchConfig(Builder builder) {
         this.serverUrl = builder.serverUrl;
-        this.useCache = builder.useCache;
         this.sdkKey = builder.sdkKey;
         this.reconnectDelay = builder.reconnectDelay;
         this.connectionTimeout = builder.connectionTimeout;
@@ -20,7 +18,6 @@ private LightSwitchConfig(Builder builder) {
 
     public static class Builder {
         private String serverUrl;
-        private boolean useCache = true;
         private String sdkKey;
         private int reconnectDelay = 5000;
         private int connectionTimeout = 10000;
@@ -35,11 +32,6 @@ public Builder serverUrl(String serverUrl) throws LightSwitchConfigException {
             return this;
         }
 
-        public Builder useCache(boolean useCache) {
-            this.useCache = useCache;
-            return this;
-        }
-
         public Builder sdkKey(String sdkKey) {
             this.sdkKey = sdkKey;
             return this;
@@ -70,10 +62,6 @@ public String getServerUrl() {
         return serverUrl;
     }
 
-    public boolean isUseCache() {
-        return useCache;
-    }
-
     public String getSdkKey() {
         return sdkKey;
     }

From d615f7adcd4125d8a59ef052f6efd4b6c7345c1e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Fri, 28 Feb 2025 12:54:07 +0900
Subject: [PATCH 8/9] [Fix] : delete useCache from test code

---
 .../java/org/lightswitch/sdk/config/LightSwitchConfigTest.java | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java
index 9cdcc4f..b110634 100644
--- a/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java
+++ b/sdk/java-sdk/src/test/java/org/lightswitch/sdk/config/LightSwitchConfigTest.java
@@ -12,14 +12,12 @@ void testValidConfig() throws LightSwitchConfigException {
         LightSwitchConfig config = new LightSwitchConfig.Builder()
                 .serverUrl("https://api.lightswitch.com")
                 .sdkKey("test-key")
-                .useCache(false)
                 .reconnectDelay(3000)
                 .connectionTimeout(15000)
                 .build();
 
         assertEquals("https://api.lightswitch.com", config.getServerUrl());
         assertEquals("test-key", config.getSdkKey());
-        assertFalse(config.isUseCache());
         assertEquals(3000, config.getReconnectDelay());
         assertEquals(15000, config.getConnectionTimeout());
     }
@@ -31,7 +29,6 @@ void testDefaultValues() throws LightSwitchConfigException {
                 .sdkKey("test-key")
                 .build();
 
-        assertTrue(config.isUseCache());
         assertEquals(5000, config.getReconnectDelay());
         assertEquals(10000, config.getConnectionTimeout());
     }

From 6094fa3d6617b01d41e120258e87a7b7b9402e9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=99=8D=EC=9C=A4=EA=B8=B0?= <lion0077v@gmail.com>
Date: Fri, 28 Feb 2025 12:59:02 +0900
Subject: [PATCH 9/9] [Feat] : Add SDK Exception

---
 .../sdk/exception/LightSwitchCastException.java      |  9 +++++++++
 .../sdk/exception/LightSwitchConfigException.java    | 12 ++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchCastException.java
 create mode 100644 sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchConfigException.java

diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchCastException.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchCastException.java
new file mode 100644
index 0000000..bd4508b
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchCastException.java
@@ -0,0 +1,9 @@
+package org.lightswitch.sdk.exception;
+
+public class LightSwitchCastException extends RuntimeException {
+
+    public LightSwitchCastException(String key, Object value, Class<?> expectedType) {
+        super(String.format("Feature flag '%s' expected type %s but got value: %s (type: %s)",
+                key, expectedType.getSimpleName(), value, value.getClass().getSimpleName()));
+    }
+}
\ No newline at end of file
diff --git a/sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchConfigException.java b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchConfigException.java
new file mode 100644
index 0000000..c0b7ea9
--- /dev/null
+++ b/sdk/java-sdk/src/main/java/org/lightswitch/sdk/exception/LightSwitchConfigException.java
@@ -0,0 +1,12 @@
+package org.lightswitch.sdk.exception;
+
+public class LightSwitchConfigException extends Exception {
+
+    public LightSwitchConfigException() {
+        super();
+    }
+
+    public LightSwitchConfigException(String message) {
+        super(message);
+    }
+}