adds layer utils

Author: bhanvimenghani

src/main/java/com/autotune/analyzer/kruizeLayer/utils/LayerUtils.java

@@ -0,0 +1,125 @@
+/*******************************************************************************
+ * Copyright (c) 2025 Red Hat, IBM Corporation and others.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *******************************************************************************/
+
+package com.autotune.analyzer.kruizeLayer.utils;
+
+import com.autotune.analyzer.kruizeLayer.KruizeLayer;
+import com.autotune.analyzer.kruizeLayer.presence.QueryBasedPresence;
+import com.autotune.database.service.ExperimentDBService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Utility class for layer detection operations
+ */
+public class LayerUtils {
+    private static final Logger LOGGER = LoggerFactory.getLogger(LayerUtils.class);
+
+    /**
+     * Detects which layers are present for a given container in a namespace
+     *
+     * @param containerName The container name
+     * @param workloadName The workload name
+     * @param namespace The Kubernetes namespace
+     * @return Map of detected layers (layer name -> KruizeLayer), or null if inputs are invalid
+     */
+    public static Map<String, KruizeLayer> detectLayers(String containerName,
+                                                         String workloadName,
+                                                         String namespace) {
+        // Validate inputs
+        if (containerName == null || containerName.isBlank()) {
+            LOGGER.warn("Container name is null or empty, cannot detect layers");
+            return null;
+        }
+        if (namespace == null || namespace.isBlank()) {
+            LOGGER.warn("Namespace is null or empty, cannot detect layers");
+            return null;
+        }
+
+        LOGGER.info("Detecting layers for container '{}' in namespace '{}'", containerName, namespace);
+
+        // Load all available layers from database
+        ExperimentDBService experimentDBService = new ExperimentDBService();
+        Map<String, KruizeLayer> allLayersMap = new HashMap<>();
+
+        try {
+            experimentDBService.loadAllLayers(allLayersMap);
+        } catch (Exception e) {
+            LOGGER.error("Failed to load layers from database: {}", e.getMessage());
+            return null;
+        }
+
+        if (allLayersMap.isEmpty()) {
+            LOGGER.warn("No layers found in database");
+            return null;
+        }
+
+        LOGGER.debug("Loaded {} layers from database", allLayersMap.size());
+
+        // Detect which layers are present
+        Map<String, KruizeLayer> detectedLayers = new HashMap<>();
+
+        for (KruizeLayer layer : allLayersMap.values()) {
+            try {
+                boolean isDetected = false;
+
+                // Use the layer's presence detector
+                if (layer.getLayerPresence() != null && layer.getLayerPresence().getDetector() != null) {
+                    // For query-based detection, pass container name as well
+                    if (layer.getLayerPresence().getDetector() instanceof QueryBasedPresence) {
+                        QueryBasedPresence queryDetector = (QueryBasedPresence) layer.getLayerPresence().getDetector();
+                        isDetected = queryDetector.detectPresence(namespace, workloadName, containerName);
+                    } else {
+                        // For other detector types (Always, Label)
+                        isDetected = layer.getLayerPresence().getDetector()
+                                .detectPresence(namespace, workloadName);
+                    }
+
+                    if (isDetected) {
+                        detectedLayers.put(layer.getLayerName(), layer);
+                        LOGGER.info("Detected layer: '{}' for container '{}'",
+                                layer.getLayerName(), containerName);
+                    } else {
+                        LOGGER.debug("Layer '{}' not detected for container '{}'",
+                                layer.getLayerName(), containerName);
+                    }
+                } else {
+                    LOGGER.warn("Layer '{}' has no presence detector configured, skipping",
+                            layer.getLayerName());
+                }
+            } catch (Exception e) {
+                LOGGER.error("Error detecting layer '{}': {}",
+                        layer.getLayerName(), e.getMessage(), e);
+                // Continue to next layer instead of failing completely
+            }
+        }
+
+        if (detectedLayers.isEmpty()) {
+            LOGGER.info("No layers detected for container '{}' in namespace '{}'",
+                    containerName, namespace);
+            return null;
+        }
+
+        LOGGER.info("Detected {} layer(s) for container '{}': {}",
+                detectedLayers.size(), containerName, detectedLayers.keySet());
+
+        return detectedLayers;
+    }
+}