aruggero commented on code in PR #4375:
URL: https://github.com/apache/solr/pull/4375#discussion_r3159860946


##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/model/SolrLanguageModel.java:
##########
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.languagemodels.model;
+
+import java.util.Map;
+
+/**
+ * Base class for Solr-managed wrappers around langchain4j used in {@code 
language-models} module

Review Comment:
   Abstract base class



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/model/package-info.java:
##########
@@ -16,4 +16,4 @@
  */
 

Review Comment:
   Is this still a "store" related package?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/rest/ManagedModelStore.java:
##########
@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.languagemodels.store.rest;
+
+import java.lang.invoke.MethodHandles;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import net.jcip.annotations.ThreadSafe;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.core.SolrResourceLoader;
+import org.apache.solr.languagemodels.model.SolrLanguageModel;
+import org.apache.solr.languagemodels.store.LanguageModelException;
+import org.apache.solr.languagemodels.store.LanguageModelStore;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.rest.BaseSolrResource;
+import org.apache.solr.rest.ManagedResource;
+import org.apache.solr.rest.ManagedResourceStorage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Abstract base class for {@link ManagedResource} wrappers that expose a 
{@link LanguageModelStore}
+ * via the REST API. Concrete subclasses supply the REST endpoint and the 
model instantiation logic.
+ */
+@ThreadSafe
+public abstract class ManagedModelStore<M extends SolrLanguageModel> extends 
ManagedResource
+    implements ManagedResource.ChildResourceSupport {
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  private static final String MODELS_JSON_FIELD = "models";
+
+  protected static final String CLASS_KEY = "class";
+  protected static final String NAME_KEY = "name";
+  protected static final String PARAMS_KEY = "params";
+
+  private final LanguageModelStore<M> store;
+  private Object managedData;
+
+  protected ManagedModelStore(
+      String resourceId, SolrResourceLoader loader, 
ManagedResourceStorage.StorageIO storageIO)
+      throws SolrException {
+    super(resourceId, loader, storageIO);
+    store = new LanguageModelStore<>();
+  }
+
+  /**
+   * Creates a model instance from the JSON map persisted in the managed 
resource storage.
+   *
+   * @param loader the resource loader for the current core
+   * @param modelMap a map containing {@code "class"}, {@code "name"}, and 
{@code "params"} keys
+   * @return the instantiated model
+   */
+  protected abstract M fromModelMap(SolrResourceLoader loader, Map<String, 
Object> modelMap);

Review Comment:
   Why registerManagedTextToVectorModelStore and getManagedModelStore are not 
abstract like this method?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/textvectorisation/store/rest/ManagedTextToVectorModelStore.java:
##########
@@ -70,21 +45,9 @@ public static ManagedTextToVectorModelStore 
getManagedModelStore(SolrCore core)
     return (ManagedTextToVectorModelStore) 
core.getRestManager().getManagedResource(REST_END_POINT);
   }
 
-  /**
-   * Returns the available models as a list of Maps objects. After an update 
the managed resources
-   * needs to return the resources in this format in order to store in json 
somewhere (zookeeper,
-   * disk...)
-   *
-   * @return the available models as a list of Maps objects
-   */
-  private static List<Object> 
modelsAsManagedResources(List<SolrTextToVectorModel> models) {
-    return models.stream()
-        .map(ManagedTextToVectorModelStore::toModelMap)
-        .collect(Collectors.toList());
-  }
-
+  @Override
   @SuppressWarnings("unchecked")
-  public static SolrTextToVectorModel fromModelMap(
+  protected SolrTextToVectorModel fromModelMap(

Review Comment:
   Why?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/textvectorisation/model/SolrTextToVectorModel.java:
##########


Review Comment:
   Would it be worth also moving the common part of this logic to 
SolrLanguageModel and generalizing it?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/rest/ManagedModelStore.java:
##########
@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.languagemodels.store.rest;
+
+import java.lang.invoke.MethodHandles;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import net.jcip.annotations.ThreadSafe;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.core.SolrResourceLoader;
+import org.apache.solr.languagemodels.model.SolrLanguageModel;
+import org.apache.solr.languagemodels.store.LanguageModelException;
+import org.apache.solr.languagemodels.store.LanguageModelStore;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.rest.BaseSolrResource;
+import org.apache.solr.rest.ManagedResource;
+import org.apache.solr.rest.ManagedResourceStorage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Abstract base class for {@link ManagedResource} wrappers that expose a 
{@link LanguageModelStore}
+ * via the REST API. Concrete subclasses supply the REST endpoint and the 
model instantiation logic.
+ */
+@ThreadSafe
+public abstract class ManagedModelStore<M extends SolrLanguageModel> extends 
ManagedResource
+    implements ManagedResource.ChildResourceSupport {
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

Review Comment:
   Why is the logger here, while for SolrLanguageModel it is in the classes 
that extend the abstract class?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/rest/package-info.java:
##########
@@ -0,0 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+/** Contains model store related classes. */

Review Comment:
   Isn't this rest specific?



##########
solr/modules/language-models/src/test/org/apache/solr/languagemodels/textvectorisation/store/rest/TestModelManagerPersistence.java:
##########
@@ -39,12 +39,12 @@ public void cleanup() throws Exception {
   }
 
   @Test
-  public void testModelAreStoredCompact() throws Exception {
+  public void testModelAreStored() throws Exception {

Review Comment:
   What does this mean?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/rest/ManagedModelStore.java:
##########
@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.languagemodels.store.rest;
+
+import java.lang.invoke.MethodHandles;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import net.jcip.annotations.ThreadSafe;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.core.SolrResourceLoader;
+import org.apache.solr.languagemodels.model.SolrLanguageModel;
+import org.apache.solr.languagemodels.store.LanguageModelException;
+import org.apache.solr.languagemodels.store.LanguageModelStore;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.rest.BaseSolrResource;
+import org.apache.solr.rest.ManagedResource;
+import org.apache.solr.rest.ManagedResourceStorage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Abstract base class for {@link ManagedResource} wrappers that expose a 
{@link LanguageModelStore}
+ * via the REST API. Concrete subclasses supply the REST endpoint and the 
model instantiation logic.
+ */
+@ThreadSafe
+public abstract class ManagedModelStore<M extends SolrLanguageModel> extends 
ManagedResource

Review Comment:
   Is there a better name variable instead of "M"?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/rest/ManagedModelStore.java:
##########
@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.solr.languagemodels.store.rest;
+
+import java.lang.invoke.MethodHandles;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import net.jcip.annotations.ThreadSafe;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.core.SolrResourceLoader;
+import org.apache.solr.languagemodels.model.SolrLanguageModel;
+import org.apache.solr.languagemodels.store.LanguageModelException;
+import org.apache.solr.languagemodels.store.LanguageModelStore;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.rest.BaseSolrResource;
+import org.apache.solr.rest.ManagedResource;
+import org.apache.solr.rest.ManagedResourceStorage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Abstract base class for {@link ManagedResource} wrappers that expose a 
{@link LanguageModelStore}
+ * via the REST API. Concrete subclasses supply the REST endpoint and the 
model instantiation logic.
+ */
+@ThreadSafe
+public abstract class ManagedModelStore<M extends SolrLanguageModel> extends 
ManagedResource
+    implements ManagedResource.ChildResourceSupport {
+  private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
+  private static final String MODELS_JSON_FIELD = "models";
+
+  protected static final String CLASS_KEY = "class";
+  protected static final String NAME_KEY = "name";
+  protected static final String PARAMS_KEY = "params";
+
+  private final LanguageModelStore<M> store;
+  private Object managedData;
+
+  protected ManagedModelStore(
+      String resourceId, SolrResourceLoader loader, 
ManagedResourceStorage.StorageIO storageIO)
+      throws SolrException {
+    super(resourceId, loader, storageIO);
+    store = new LanguageModelStore<>();
+  }
+
+  /**
+   * Creates a model instance from the JSON map persisted in the managed 
resource storage.
+   *
+   * @param loader the resource loader for the current core
+   * @param modelMap a map containing {@code "class"}, {@code "name"}, and 
{@code "params"} keys
+   * @return the instantiated model
+   */
+  protected abstract M fromModelMap(SolrResourceLoader loader, Map<String, 
Object> modelMap);
+
+  private static LinkedHashMap<String, Object> toModelMap(SolrLanguageModel 
model) {
+    final LinkedHashMap<String, Object> modelMap = new LinkedHashMap<>(3, 
1.0f);
+    modelMap.put(NAME_KEY, model.getName());
+    modelMap.put(CLASS_KEY, model.getModelClassName());
+    modelMap.put(PARAMS_KEY, model.getParams());
+    return modelMap;
+  }
+
+  @Override
+  protected void onManagedDataLoadedFromStorage(NamedList<?> managedInitArgs, 
Object managedData)
+      throws SolrException {
+    store.clear();
+    this.managedData = managedData;
+  }
+
+  public void loadStoredModels() {
+    log.info("------ managed models ~ loading ------");
+    if ((managedData != null) && (managedData instanceof List)) {
+      @SuppressWarnings("unchecked")
+      final List<Map<String, Object>> models = (List<Map<String, Object>>) 
managedData;
+      for (final Map<String, Object> model : models) {
+        addModelFromMap(model);
+      }
+    }
+  }
+
+  private void addModelFromMap(Map<String, Object> modelMap) {
+    try {
+      addModel(fromModelMap(solrResourceLoader, modelMap));
+    } catch (final LanguageModelException e) {
+      throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
+    }
+  }
+
+  public void addModel(M model) throws SolrException {
+    try {
+      if (log.isInfoEnabled()) {
+        log.info("adding model {}", model.getName());
+      }
+      store.addModel(model);
+    } catch (final LanguageModelException e) {
+      throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  @Override
+  protected Object applyUpdatesToManagedData(Object updates) {
+    if (updates instanceof List) {
+      final List<Map<String, Object>> models = (List<Map<String, Object>>) 
updates;
+      for (final Map<String, Object> model : models) {
+        addModelFromMap(model);
+      }
+    }
+    if (updates instanceof Map) {
+      addModelFromMap((Map<String, Object>) updates);
+    }
+    return modelsAsManagedResources(store.getModels());
+  }
+
+  @Override
+  public void doDeleteChild(BaseSolrResource endpoint, String childId) {
+    store.delete(childId);
+    storeManagedData(applyUpdatesToManagedData(null));
+  }
+
+  @Override
+  public void doGet(BaseSolrResource endpoint, String childId) {
+    final SolrQueryResponse response = endpoint.getSolrResponse();
+    response.add(MODELS_JSON_FIELD, 
modelsAsManagedResources(store.getModels()));
+  }
+
+  public M getModel(String modelName) {
+    return store.getModel(modelName);
+  }
+
+  private static List<Object> modelsAsManagedResources(List<? extends 
SolrLanguageModel> models) {
+    return 
models.stream().map(ManagedModelStore::toModelMap).collect(Collectors.toList());
+  }
+
+  @Override
+  public String toString() {
+    return getClass().getSimpleName() + " [store=" + store + "]";

Review Comment:
   Why do we not have "ManagedLargeLanguageModelStore" anymore here? or 
something similar



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/LanguageModelStore.java:
##########
@@ -14,53 +14,52 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.solr.languagemodels.textvectorisation.store;
+package org.apache.solr.languagemodels.store;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import 
org.apache.solr.languagemodels.textvectorisation.model.SolrTextToVectorModel;
+import org.apache.solr.languagemodels.model.SolrLanguageModel;
 
-/** Simple store to manage CRUD operations on the {@link 
SolrTextToVectorModel} */
-public class TextToVectorModelStore {
+/** Generic store to manage CRUD operations on models that extend {@link 
SolrLanguageModel} */

Review Comment:
   Is this class necessary? Can't we just have ManagedModelStore with 
everything inside?



##########
solr/modules/language-models/src/java/org/apache/solr/languagemodels/store/LanguageModelStore.java:
##########
@@ -14,53 +14,52 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.solr.languagemodels.textvectorisation.store;
+package org.apache.solr.languagemodels.store;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import 
org.apache.solr.languagemodels.textvectorisation.model.SolrTextToVectorModel;
+import org.apache.solr.languagemodels.model.SolrLanguageModel;
 
-/** Simple store to manage CRUD operations on the {@link 
SolrTextToVectorModel} */
-public class TextToVectorModelStore {
+/** Generic store to manage CRUD operations on models that extend {@link 
SolrLanguageModel} */
+public class LanguageModelStore<M extends SolrLanguageModel> {

Review Comment:
   Again, a better name instead of "M"?



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