tweak Nullable annotations

Signed-off-by: neo <1100909+neowu@users.noreply.github.com>

Author: neowu

buildSrc/src/main/kotlin/frontend.gradle.kts

@@ -6,7 +6,7 @@ tasks.named("mkdir") {
 
 interface Context {
     @get:Inject
-    val operation: ExecOperations
+    val exec: ExecOperations
 
     @get:Inject
     val fs: FileSystemOperations
@@ -24,15 +24,15 @@ afterEvaluate {
     tasks.register("buildFrontend") {
         group = "build"
         doLast {
-            context.operation.exec {
+            context.exec.exec {
                 workingDir(frontendDir)
                 commandLine(Frontend.commandLine(listOf("pnpm", "install")))
             }
 
             val command = mutableListOf("pnpm", "run", "build")
             if (env != null) command.addAll(listOf("--env", env))
 
-            context.operation.exec {
+            context.exec.exec {
                 workingDir(frontendDir)
                 commandLine(Frontend.commandLine(command))
             }

core-ng/src/main/java/core/framework/internal/log/ActionLog.java

@@ -117,7 +117,7 @@ public String errorCode() {
         return null;
     }
 
-    public void context(String key, Object... values) {
+    public void context(String key, @Nullable Object... values) {
         List<String> contextValues = context.computeIfAbsent(key, k -> new ArrayList<>(Math.max(2, values.length)));    // at least use 2 as init capacity, 0 capacity will result in size 10 array after adding
         for (Object value : values) {
             String contextValue = String.valueOf(value);

core-ng/src/main/java/core/framework/log/ActionLogContext.java

@@ -31,7 +31,7 @@ public static List<String> get(String key) {
         return values;
     }
 
-    public static void put(String key, Object... values) {
+    public static void put(String key, @Nullable Object... values) {
         ActionLog actionLog = LogManager.CURRENT_ACTION_LOG.get();
         if (actionLog != null) {    // here to check null is for unit testing the logManager.begin may not be called
             actionLog.context(key, values);

core-ng/src/test/java/core/framework/log/ActionLogContextTest.java

@@ -31,11 +31,14 @@ void withCurrentActionLog() {
 
         assertThat(ActionLogContext.id()).isNotNull();
 
-        ActionLogContext.get("key");
         assertThat(ActionLogContext.get("key")).isEmpty();
         ActionLogContext.put("key", "value");
         assertThat(ActionLogContext.get("key")).contains("value");
 
+        String value = null;
+        ActionLogContext.put("nullValue", value);
+        assertThat(ActionLogContext.get("nullValue")).contains("null");
+
         assertThat(ActionLogContext.track("db", 100)).isEqualTo(1);
         assertThat(ActionLogContext.track("db", 100)).isEqualTo(2);