Feature/add parameter to ignore methods by annotation packages

test2code/src/main/kotlin/com/epam/drill/agent/test2code/Test2Code.kt

@@ -148,16 +148,33 @@ class Test2Code(
             return
         }
         var classCount = 0
-        var methodCount = 0
+        var totalMethodsCount = 0
+        var filteredMethodsCount = 0
+
+        val excludeMethodsByAnnotationPackage =
+            configuration.parameters[Test2CodeParameterDefinitions.EXCLUDE_METHODS_BY_ANNOTATION_PACKAGE]  as List<String>
+        val hasAnnotationsExclusions = excludeMethodsByAnnotationPackage.isNotEmpty()
+
         scanClasses { classes ->
             classes
                 .also { classCount += it.size }
-                .flatMap { parseAstClass(it.entityName(), it.bytes()) }
-                .also { methodCount += it.size }
-                .chunked(configuration.parameters[Test2CodeParameterDefinitions.METHODS_SEND_PAGE_SIZE])
+                .asSequence()
+                .flatMap { parseAstClass(it.entityName(), it.bytes()).asSequence() }
+                .onEach { totalMethodsCount++ }
+                .filter { method ->
+                    !hasAnnotationsExclusions ||
+                            method.annotations?.keys?.none { key ->
+                                excludeMethodsByAnnotationPackage.any { key.contains(it) }
+                            } ?: false
+                }
+                .onEach { filteredMethodsCount++ }
+                .chunkedLazy(configuration.parameters[Test2CodeParameterDefinitions.METHODS_SEND_PAGE_SIZE])
                 .forEach(::sendClassMetadata)
         }
-        logger.info { "Scanned $classCount classes with $methodCount methods" }
+        logger.info { """Scanned $classCount classes with $filteredMethodsCount methods
+            | total methods: ${totalMethodsCount + filteredMethodsCount};
+            | methods excluded by annotations: ${totalMethodsCount - filteredMethodsCount}
+            | packages for annotations-based exclusion are specified in ${Test2CodeParameterDefinitions.EXCLUDE_METHODS_BY_ANNOTATION_PACKAGE.name} parameter """.trimMargin() }
     }
 
     private val classMetadataDestination = AgentMessageDestination("PUT", "methods")
@@ -174,5 +191,16 @@ class Test2Code(
         logger.debug { "sendClassMetadata: Sending methods: $message" }
         sender.send(classMetadataDestination, message, ClassMetadata.serializer())
     }
+}
 
+private fun <T> Sequence<T>.chunkedLazy(size: Int): Sequence<List<T>> = sequence {
+    val buffer = mutableListOf<T>()
+    for (item in this@chunkedLazy) {
+        buffer += item
+        if (buffer.size == size) {
+            yield(buffer.toList())
+            buffer.clear()
+        }
+    }
+    if (buffer.isNotEmpty()) yield(buffer.toList())
 }

test2code/src/main/kotlin/com/epam/drill/agent/test2code/configuration/Test2CodeParameterDefinitions.kt

@@ -21,6 +21,7 @@ import com.epam.drill.agent.common.configuration.AgentParameterDefinitionCollect
 import com.epam.drill.agent.common.configuration.BaseAgentParameterDefinition
 import com.epam.drill.agent.common.configuration.ValidationType
 import com.epam.drill.agent.configuration.isNotBlank
+import com.epam.drill.agent.configuration.isValidPackage
 import com.epam.drill.agent.configuration.minDuration
 
 object Test2CodeParameterDefinitions : AgentParameterDefinitionCollection() {
@@ -68,5 +69,23 @@ object Test2CodeParameterDefinitions : AgentParameterDefinitionCollection() {
         description = "Enable/disable application classes scanning",
         defaultValue = true
     ).register()
+    val EXCLUDE_METHODS_BY_ANNOTATION_PACKAGE = AgentParameterDefinition.forList(
+        name = "excludeMethodsByAnnotationPackage",
+        description = """
+            Excludes methods with annotations from the specified packages from code scanning process.
+            Matches exact packages and descendants.
+
+            Package names must be delimited with / (forward slash) and separated by ;
+
+            Example: exclude methods autogenerated by SLF4J and Lombok
+            org/slf4j;lombok
+        """.trimIndent(),
+        defaultValue = emptyList(),
+        parser = { it.split(";") },
+        validation = ValidationType.SOFT,
+        itemValidator = {
+            isValidPackage()
+        }
+    ).register()
 
 }