DummyEmbeddingModel: add a parameter and matching test

solr/modules/llm/src/java/org/apache/solr/llm/embedding/SolrEmbeddingModel.java

@@ -19,7 +19,9 @@
 import dev.langchain4j.data.embedding.Embedding;
 import dev.langchain4j.model.embedding.DimensionAwareEmbeddingModel;
 import dev.langchain4j.model.embedding.EmbeddingModel;
+import java.lang.reflect.Method;
 import java.time.Duration;
+import java.util.ArrayList;
 import java.util.Map;
 import java.util.Objects;
 import org.apache.lucene.util.Accountable;
@@ -78,10 +80,20 @@ public static SolrEmbeddingModel getInstance(
                   .invoke(builder, ((Long) params.get(paramName)).intValue());
               break;
             default:
-              builder
-                  .getClass()
-                  .getMethod(paramName, String.class)
-                  .invoke(builder, params.get(paramName));
+              ArrayList<Method> methods = new ArrayList<>();
+              for (var method : builder.getClass().getMethods()) {
+                if (paramName.equals(method.getName()) && method.getParameterCount() == 1) {
+                  methods.add(method);
+                }
+              }
+              if (methods.size() == 1) {
+                methods.get(0).invoke(builder, params.get(paramName));
+              } else {
+                builder
+                    .getClass()
+                    .getMethod(paramName, String.class)
+                    .invoke(builder, params.get(paramName));
+              }
           }
         }
       }

solr/modules/llm/src/test-files/modelExamples/dummy-model.json

@@ -1,4 +1,7 @@
 {
   "class": "org.apache.solr.llm.embedding.DummyEmbeddingModel",
-  "name": "dummy-1"
+  "name": "dummy-1",
+  "params": {
+    "embedding": 1234
+  }
 }

solr/modules/llm/src/test/org/apache/solr/llm/embedding/DummyEmbeddingModel.java

@@ -23,17 +23,24 @@
 import java.util.List;
 
 public class DummyEmbeddingModel implements EmbeddingModel {
-  public DummyEmbeddingModel() {}
+  final float[] embedding;
+
+  public DummyEmbeddingModel(int embedding) {
+    this.embedding =
+        new float[] {
+          (embedding / 1000) % 10, (embedding / 100) % 10, (embedding / 10) % 10, embedding % 10
+        };
+  }
 
   @Override
   public Response<Embedding> embed(String text) {
-    Embedding dummy = new Embedding(new float[] {1.0f, 2.0f, 3.0f, 4.0f});
+    Embedding dummy = new Embedding(this.embedding);
     return new Response<Embedding>(dummy);
   }
 
   @Override
   public Response<Embedding> embed(TextSegment textSegment) {
-    Embedding dummy = new Embedding(new float[] {1.0f, 2.0f, 3.0f, 4.0f});
+    Embedding dummy = new Embedding(this.embedding);
     return new Response<Embedding>(dummy);
   }
 
@@ -44,18 +51,25 @@ public Response<List<Embedding>> embedAll(List<TextSegment> textSegments) {
 
   @Override
   public int dimension() {
-    return 4;
+    return embedding.length;
   }
 
   public static DummyEmbeddingModelBuilder builder() {
     return new DummyEmbeddingModelBuilder();
   }
 
   public static class DummyEmbeddingModelBuilder {
+    private int embedding = 0;
+
     public DummyEmbeddingModelBuilder() {}
 
+    public DummyEmbeddingModelBuilder embedding(Long embedding) {
+      this.embedding = embedding.intValue();
+      return this;
+    }
+
     public DummyEmbeddingModel build() {
-      return new DummyEmbeddingModel();
+      return new DummyEmbeddingModel(this.embedding);
     }
   }
 }

solr/modules/llm/src/test/org/apache/solr/llm/embedding/DummyEmbeddingModelTest.java

@@ -0,0 +1,36 @@
+/*
+ * 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.llm.embedding;
+
+import org.apache.solr.SolrTestCase;
+import org.junit.Test;
+
+public class DummyEmbeddingModelTest extends SolrTestCase {
+
+  @Test
+  public void constructAndEmbed() throws Exception {
+    assertEquals(
+        "[1.0, 2.0, 3.0, 4.0]",
+        new DummyEmbeddingModel(1234).embed("hello").content().vectorAsList().toString());
+    assertEquals(
+        "[8.0, 7.0, 6.0, 5.0]",
+        new DummyEmbeddingModel(98765).embed("world").content().vectorAsList().toString());
+    assertEquals(
+        "[0.0, 0.0, 4.0, 2.0]",
+        new DummyEmbeddingModel(42).embed("answer").content().vectorAsList().toString());
+  }
+}