remove and add comment

Signed-off-by: xinyual <xinyual@amazon.com>

Author: xinyual

plugin/src/main/java/org/opensearch/ml/action/models/DeleteModelTransportAction.java

@@ -16,15 +16,18 @@
 import static org.opensearch.ml.utils.MLNodeUtils.createXContentParserFromRegistry;
 import static org.opensearch.ml.utils.RestActionUtils.getFetchSourceContext;
 
+import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Deque;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Function;
 
+import org.apache.commons.lang3.tuple.Pair;
 import org.opensearch.OpenSearchStatusException;
 import org.opensearch.ResourceNotFoundException;
 import org.opensearch.action.ActionRequest;
@@ -290,21 +293,21 @@ private void checkAgentBeforeDeleteModel(String modelId, ActionListener<Boolean>
     private void checkIngestPipelineBeforeDeleteModel(String modelId, ActionListener<Boolean> actionListener) {
         GetPipelineRequest getPipelineRequest = new GetPipelineRequest();
         client.execute(GetPipelineAction.INSTANCE, getPipelineRequest, ActionListener.wrap(ingestPipelineResponse -> {
-            List<String> allRelevantPipelineIds = findRelevantPipelines(
+            List<String> allDependentPipelineIds = findDependentPipelines(
                 ingestPipelineResponse.pipelines(),
                 modelId,
                 org.opensearch.ingest.PipelineConfiguration::getConfigAsMap,
                 org.opensearch.ingest.PipelineConfiguration::getId
             );
-            if (allRelevantPipelineIds.isEmpty()) {
+            if (allDependentPipelineIds.isEmpty()) {
                 actionListener.onResponse(true);
             } else {
                 actionListener
                     .onFailure(
                         new OpenSearchStatusException(
-                            allRelevantPipelineIds.size()
+                            allDependentPipelineIds.size()
                                 + " ingest pipelines are still using this model, please delete or update the pipelines first: "
-                                + Arrays.toString(allRelevantPipelineIds.toArray(new String[0])),
+                                + Arrays.toString(allDependentPipelineIds.toArray(new String[0])),
                             RestStatus.CONFLICT
                         )
                     );
@@ -320,21 +323,21 @@ private void checkIngestPipelineBeforeDeleteModel(String modelId, ActionListener
     private void checkSearchPipelineBeforeDeleteModel(String modelId, ActionListener<Boolean> actionListener) {
         GetSearchPipelineRequest getSearchPipelineRequest = new GetSearchPipelineRequest();
         client.execute(GetSearchPipelineAction.INSTANCE, getSearchPipelineRequest, ActionListener.wrap(searchPipelineResponse -> {
-            List<String> allRelevantPipelineIds = findRelevantPipelines(
+            List<String> allDependentPipelineIds = findDependentPipelines(
                 searchPipelineResponse.pipelines(),
                 modelId,
                 org.opensearch.search.pipeline.PipelineConfiguration::getConfigAsMap,
                 org.opensearch.search.pipeline.PipelineConfiguration::getId
             );
-            if (allRelevantPipelineIds.isEmpty()) {
+            if (allDependentPipelineIds.isEmpty()) {
                 actionListener.onResponse(true);
             } else {
                 actionListener
                     .onFailure(
                         new OpenSearchStatusException(
-                            allRelevantPipelineIds.size()
+                            allDependentPipelineIds.size()
                                 + " search pipelines are still using this model, please delete or update the pipelines first: "
-                                + Arrays.toString(allRelevantPipelineIds.toArray(new String[0])),
+                                + Arrays.toString(allDependentPipelineIds.toArray(new String[0])),
                             RestStatus.CONFLICT
                         )
                     );
@@ -475,40 +478,57 @@ private Boolean isModelNotDeployed(MLModelState mlModelState) {
             && !mlModelState.equals(MLModelState.PARTIALLY_DEPLOYED);
     }
 
-    private <T> List<String> findRelevantPipelines(
+    private <T> List<String> findDependentPipelines(
         List<T> pipelineConfigurations,
         String candidateModelId,
         Function<T, Map<String, Object>> getConfigFunction,
         Function<T, String> getIdFunction
     ) {
-        List<String> relevantPipelineConfigurations = new ArrayList<>();
+        List<String> dependentPipelineConfigurations = new ArrayList<>();
         for (T pipelineConfiguration : pipelineConfigurations) {
             Map<String, Object> config = getConfigFunction.apply(pipelineConfiguration);
             if (searchThroughConfig(config, candidateModelId, "")) {
-                relevantPipelineConfigurations.add(getIdFunction.apply(pipelineConfiguration));
+                dependentPipelineConfigurations.add(getIdFunction.apply(pipelineConfiguration));
             }
         }
-        return relevantPipelineConfigurations;
+        return dependentPipelineConfigurations;
     }
 
+    // This method is to go through the pipeline configs and only when the key is model id and value is
+    // 1. String and equal to candidate id 2. A list of String containing candidate id We will return True. Otherwise False
     private Boolean searchThroughConfig(Object searchCandidate, String candidateId, String targetModelKey) {
-        boolean flag = false;
-        if (searchCandidate instanceof String
-            && Objects.equals(targetModelKey, PIPELINE_TARGET_MODEL_KEY)
-            && Objects.equals(candidateId, searchCandidate)) {
-            return true;
-        } else if (searchCandidate instanceof List<?>) {
-            for (Object v : (List<?>) searchCandidate) {
-                flag = flag || searchThroughConfig(v, candidateId, targetModelKey);
-            }
-        } else if (searchCandidate instanceof Map<?, ?>) {
-            for (Map.Entry<String, Object> entry : ((Map<String, Object>) searchCandidate).entrySet()) {
-                String key = entry.getKey();
-                Object value = entry.getValue();
-                flag = flag || searchThroughConfig(value, candidateId, key);
+        // Use a stack to store the elements to be processed
+        Deque<Pair<String, Object>> stack = new ArrayDeque<>();
+        stack.push(Pair.of(targetModelKey, searchCandidate));
+
+        while (!stack.isEmpty()) {
+            // Pop an item from the stack
+            Pair<String, Object> current = stack.pop();
+            String currentKey = current.getLeft();
+            Object currentCandidate = current.getRight();
+
+            if (currentCandidate instanceof String) {
+                // Check for a match
+                if (Objects.equals(currentKey, PIPELINE_TARGET_MODEL_KEY) && Objects.equals(candidateId, currentCandidate)) {
+                    return true;
+                }
+            } else if (currentCandidate instanceof List<?>) {
+                // Push all elements in the list onto the stack
+                for (Object v : (List<?>) currentCandidate) {
+                    stack.push(Pair.of(currentKey, v));
+                }
+            } else if (currentCandidate instanceof Map<?, ?>) {
+                // Push all values in the map onto the stack
+                for (Map.Entry<?, ?> entry : ((Map<?, ?>) currentCandidate).entrySet()) {
+                    String key = (String) entry.getKey();
+                    Object value = entry.getValue();
+                    stack.push(Pair.of(key, value));
+                }
             }
         }
-        return flag;
+
+        // If no match is found
+        return false;
     }
 
     // this method is only to stub static method.

plugin/src/test/java/org/opensearch/ml/action/models/DeleteModelTransportActionTests.java

@@ -749,7 +749,7 @@ private void prepare() throws IOException {
             return null;
         }).when(client).execute(eq(GetSearchPipelineAction.INSTANCE), any(), any());
         configDataMap = Map
-            .of("model_id", "test_id", "list_model_id", List.of("test_list_id"), "test_map_id", Map.of("test_key", "test_map_id"));
+            .of("single_model_id", "test_id", "list_model_id", List.of("test_id"), "test_map_id", Map.of("model_id", "test_id"));
         doAnswer(invocation -> new SearchRequest()).when(agentModelsSearcher).constructQueryRequest(any());
 
         GetResponse getResponse = prepareMLModel(MLModelState.REGISTERED, null, false);

spi/src/main/java/org/opensearch/ml/common/spi/tools/Tool.java

@@ -130,6 +130,10 @@ interface Factory<T extends Tool> {
          */
         String getDefaultVersion();
 
+        /**
+         * Get model id related field names
+         * @return the list of all model id related field names
+         */
         List<String> getAllModelKeys();
     }
 }