reverting litmus client to java 11

Signed-off-by: chandresh pancholi <chandresh.pancholi@navi.com>

.gitignore

@@ -28,4 +28,6 @@ litmus-proxy/target
 litmus-util/litmus-util.iml
 litmus-util/target
 
-target
+target
+log
+.descriptions.json

litmus-client/src/main/java/com/navi/medici/strategy/FlexibleRolloutStrategy.java

@@ -33,17 +33,25 @@ public class FlexibleRolloutStrategy implements Strategy {
     }
 
     private Optional<String> resolveStickiness(String stickiness, LitmusContext context) {
-        return switch (stickiness) {
-            case "userId" -> context.getUserId();
-            case "sessionId" -> context.getSessionId();
-            case "deviceId" -> context.getDeviceId();
-            case "appVersionCode" -> context.getAppVersionCode();
-            case "osType" -> context.getOsType();
-            case "random" -> Optional.of(randomGenerator.get());
-            case "default" -> Optional.of(context.getUserId()
-                .orElse(context.getSessionId().orElse(this.randomGenerator.get())));
-            default -> context.getByName(stickiness);
-        };
+        switch (stickiness) {
+            case "userId":
+                return context.getUserId();
+            case "sessionId":
+                return context.getSessionId();
+            case "deviceId":
+                return context.getDeviceId();
+            case "appVersionCode":
+                return context.getAppVersionCode();
+            case "osType":
+                return context.getOsType();
+            case "random":
+                return Optional.of(randomGenerator.get());
+            case "default":
+                return Optional.of(context.getUserId()
+                    .orElse(context.getSessionId().orElse(this.randomGenerator.get())));
+            default:
+                return context.getByName(stickiness);
+        }
     }
 
     @Override

litmus-client/src/main/java/com/navi/medici/util/VariantUtil.java

@@ -12,104 +12,119 @@ import java.util.function.Predicate;
 import org.apache.commons.lang3.StringUtils;
 
 public final class VariantUtil {
-        private VariantUtil() {}
 
-        private static Predicate<VariantOverride> overrideMatchesContext(LitmusContext context) {
-            return (override) -> {
-                Optional<String> contextValue;
-                switch (override.getContextName()) {
-                    case "userId" -> contextValue = context.getUserId();
-                    case "sessionId" -> contextValue = context.getSessionId();
-                    case "remoteAddress" -> contextValue = context.getRemoteAddress();
-                    case "appVersionCode" -> contextValue = context.getAppVersionCode();
-                    case "osType" -> contextValue = context.getOsType();
-                    case "deviceId" -> contextValue = context.getDeviceId();
-                    default -> contextValue = Optional.ofNullable(context.getProperties().get(override.getContextName()));
-                }
-                return override.getValues().contains(contextValue.orElse(""));
-            };
-        }
+    private VariantUtil() {
+    }
 
-        private static Optional<VariantDefinition> getOverride(
-            List<VariantDefinition> variants, LitmusContext context) {
-            return variants.stream()
-                .filter(
-                    variant ->
-                        variant.getOverrides().stream()
-                            .anyMatch(overrideMatchesContext(context)))
-                .findFirst();
-        }
-
-        private static String getIdentifier(LitmusContext context) {
-            return context.getUserId()
-                .orElse(
-                    context.getSessionId()
-                        .orElse(
-                            context.getRemoteAddress()
-                                .orElse(context.getAppVersionCode()
-                                    .orElse(context.getOsType()
-                                        .orElse(context.getDeviceId()
-                                            .orElse(Double.toString(Math.random())))))
-                        ));
-        }
-
-        private static String randomString() {
-            int randSeed = new Random().nextInt(100000);
-            return "" + randSeed;
-        }
-
-        private static String getSeed(LitmusContext litmusContext, Optional<String> stickiness) {
-            return stickiness
-                .map(s -> litmusContext.getByName(s).orElse(randomString()))
-                .orElse(getIdentifier(litmusContext));
-        }
-
-        public static Variant selectVariant(LitmusExperiment litmusExperiment, LitmusContext context, Variant defaultVariant) {
-            if (litmusExperiment == null || StringUtils.isBlank(litmusExperiment.getVariants())) {
-                return defaultVariant;
-            }
-            List<VariantDefinition> variants = JacksonUtils.stringToListObject(litmusExperiment.getVariants(), VariantDefinition.class);
-            int totalWeight = variants.stream().mapToInt(VariantDefinition::getWeight).sum();
-            if (totalWeight == 0) {
-                return defaultVariant;
+    private static Predicate<VariantOverride> overrideMatchesContext(LitmusContext context) {
+        return (override) -> {
+            Optional<String> contextValue;
+            switch (override.getContextName()) {
+                case "userId":
+                    contextValue = context.getUserId();
+                    break;
+                case "sessionId":
+                    contextValue = context.getSessionId();
+                    break;
+                case "remoteAddress":
+                    contextValue = context.getRemoteAddress();
+                    break;
+                case "appVersionCode":
+                    contextValue = context.getAppVersionCode();
+                    break;
+                case "osType":
+                    contextValue = context.getOsType();
+                    break;
+                case "deviceId":
+                    contextValue = context.getDeviceId();
+                    break;
+                default:
+                    contextValue = Optional.ofNullable(context.getProperties().get(override.getContextName()));
             }
+            return override.getValues().contains(contextValue.orElse(""));
+        };
+    }
 
-            Optional<VariantDefinition> variantOverride = getOverride(variants, context);
-            if (variantOverride.isPresent()) {
-                var variantDefinition = variantOverride.get();
-                return Variant.builder()
-                    .name(variantDefinition.getName())
-                    .payload(variantDefinition.getPayload())
-                    .enabled(true)
-                    .stickiness(variantDefinition.getStickiness())
-                    .build();
-            }
-            Optional<String> customStickiness =
-                variants.stream()
-                    .filter(f -> f.getStickiness() != null)
-                    .map(VariantDefinition::getStickiness)
-                    .findFirst();
-            int target =
-                StrategyUtils.getNormalizedNumber(
-                    getSeed(context, customStickiness), litmusExperiment.getName(), totalWeight);
+    private static Optional<VariantDefinition> getOverride(
+        List<VariantDefinition> variants, LitmusContext context) {
+        return variants.stream()
+            .filter(
+                variant ->
+                    variant.getOverrides().stream()
+                        .anyMatch(overrideMatchesContext(context)))
+            .findFirst();
+    }
 
-            int counter = 0;
-            for (final VariantDefinition definition : variants) {
-                if (definition.getWeight() != 0) {
-                    counter += definition.getWeight();
-                    if (counter >= target) {
-                        return Variant.builder()
-                            .name(definition.getName())
-                            .payload(definition.getPayload())
-                            .enabled(true)
-                            .stickiness(definition.getStickiness())
-                            .build();
-                    }
-                }
-            }
+    private static String getIdentifier(LitmusContext context) {
+        return context.getUserId()
+            .orElse(
+                context.getSessionId()
+                    .orElse(
+                        context.getRemoteAddress()
+                            .orElse(context.getAppVersionCode()
+                                .orElse(context.getOsType()
+                                    .orElse(context.getDeviceId()
+                                        .orElse(Double.toString(Math.random())))))
+                    ));
+    }
 
-            // Should not happen
+    private static String randomString() {
+        int randSeed = new Random().nextInt(100000);
+        return "" + randSeed;
+    }
+
+    private static String getSeed(LitmusContext litmusContext, Optional<String> stickiness) {
+        return stickiness
+            .map(s -> litmusContext.getByName(s).orElse(randomString()))
+            .orElse(getIdentifier(litmusContext));
+    }
+
+    public static Variant selectVariant(LitmusExperiment litmusExperiment, LitmusContext context, Variant defaultVariant) {
+        if (litmusExperiment == null || StringUtils.isBlank(litmusExperiment.getVariants())) {
+            return defaultVariant;
+        }
+        List<VariantDefinition> variants = JacksonUtils.stringToListObject(litmusExperiment.getVariants(), VariantDefinition.class);
+        int totalWeight = variants.stream().mapToInt(VariantDefinition::getWeight).sum();
+        if (totalWeight == 0) {
             return defaultVariant;
         }
 
+        Optional<VariantDefinition> variantOverride = getOverride(variants, context);
+        if (variantOverride.isPresent()) {
+            var variantDefinition = variantOverride.get();
+            return Variant.builder()
+                .name(variantDefinition.getName())
+                .payload(variantDefinition.getPayload())
+                .enabled(true)
+                .stickiness(variantDefinition.getStickiness())
+                .build();
+        }
+        Optional<String> customStickiness =
+            variants.stream()
+                .filter(f -> f.getStickiness() != null)
+                .map(VariantDefinition::getStickiness)
+                .findFirst();
+        int target =
+            StrategyUtils.getNormalizedNumber(
+                getSeed(context, customStickiness), litmusExperiment.getName(), totalWeight);
+
+        int counter = 0;
+        for (final VariantDefinition definition : variants) {
+            if (definition.getWeight() != 0) {
+                counter += definition.getWeight();
+                if (counter >= target) {
+                    return Variant.builder()
+                        .name(definition.getName())
+                        .payload(definition.getPayload())
+                        .enabled(true)
+                        .stickiness(definition.getStickiness())
+                        .build();
+                }
+            }
+        }
+
+        // Should not happen
+        return defaultVariant;
+    }
+
 }

litmus-proxy/src/main/java/com/navi/medici/container/LitmusProxyContainer.java

@@ -11,13 +11,11 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.stereotype.Component;
 
 @Component
-@RequiredArgsConstructor
-public class LitmusProxyContainer {
-    private final LitmusProxyConfig litmusProxyConfig;
+public record LitmusProxyContainer(LitmusProxyConfig litmusProxyConfig) {
 
     @Bean
     public Litmus litmus(RequestMetadata requestMetadata) {
-        var litmusConfig =  LitmusConfig.builder()
+        var litmusConfig = LitmusConfig.builder()
             .litmusAPI(litmusProxyConfig.getLitmusEndpoint())
             .appName("litmus-proxy")
             .instanceId("test-instance")

litmus-proxy/src/main/java/com/navi/medici/controller/LitmusProxyController.java

@@ -12,10 +12,8 @@ import org.springframework.web.bind.annotation.RestController;
 
 @RestController
 @RequestMapping("/v1/proxy")
-@RequiredArgsConstructor
 @Log4j2
-public class LitmusProxyController {
-    private final Litmus litmus;
+public record LitmusProxyController(Litmus litmus) {
 
     @GetMapping(value = "/experiment", produces = MediaType.APPLICATION_JSON_VALUE)
     public ResponseEntity<?> fetch(@RequestParam("name") String experimentName) {
@@ -24,4 +22,11 @@ public class LitmusProxyController {
         return ResponseEntity.ok(result);
     }
 
+    @GetMapping(value = "/variant", produces = MediaType.APPLICATION_JSON_VALUE)
+    public ResponseEntity<?> fetchVariants(@RequestParam("name") String variantName) {
+        var variant = litmus.getVariant(variantName);
+
+        return ResponseEntity.ok(variant);
+    }
+
 }

litmus-proxy/src/main/java/com/navi/medici/provider/CustomLitmusProxyContextProvider.java

@@ -1,5 +1,6 @@
 package com.navi.medici.provider;
 
+import com.navi.medici.config.LitmusConfig;
 import com.navi.medici.context.LitmusContext;
 import com.navi.medici.interceptor.RequestMetadata;
 import lombok.extern.log4j.Log4j2;
@@ -9,17 +10,12 @@ import org.springframework.web.context.annotation.RequestScope;
 @Component
 @RequestScope
 @Log4j2
-public class CustomLitmusProxyContextProvider implements LitmusContextProvider {
-
-    private final RequestMetadata requestMetadata;
-
-    public CustomLitmusProxyContextProvider(RequestMetadata requestMetadata) {
-        this.requestMetadata = requestMetadata;
-    }
+public record CustomLitmusProxyContextProvider(RequestMetadata requestMetadata) implements LitmusContextProvider {
 
     @Override
     public LitmusContext getContext() {
         return LitmusContext.builder()
+            .userId(requestMetadata.customerId().orElseGet(() -> ""))
             .clickStreamPayload(requestMetadata.getClickStreamData())
             .appVersionCode(requestMetadata.getAppVersionCode().orElse(""))
             .osType(requestMetadata.getOsVersion().orElse(""))