4.x: Langchain4j - adds support for Langchain4j Cohere provider.

all/pom.xml

@@ -795,6 +795,10 @@
             <groupId>io.helidon.integrations.langchain4j.providers</groupId>
             <artifactId>helidon-integrations-langchain4j-providers-open-ai</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.helidon.integrations.langchain4j.providers</groupId>
+            <artifactId>helidon-integrations-langchain4j-providers-cohere</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.helidon.integrations.langchain4j.providers</groupId>
             <artifactId>helidon-integrations-langchain4j-providers-ollama</artifactId>

bom/pom.xml

@@ -1053,6 +1053,11 @@
                 <artifactId>helidon-integrations-langchain4j-providers-open-ai</artifactId>
                 <version>${helidon.version}</version>
             </dependency>
+            <dependency>
+                <groupId>io.helidon.integrations.langchain4j.providers</groupId>
+                <artifactId>helidon-integrations-langchain4j-providers-cohere</artifactId>
+                <version>${helidon.version}</version>
+            </dependency>
             <dependency>
                 <groupId>io.helidon.integrations.langchain4j.providers</groupId>
                 <artifactId>helidon-integrations-langchain4j-providers-ollama</artifactId>

integrations/langchain4j/langchain4j/src/main/java/io/helidon/integrations/langchain4j/Ai.java

@@ -51,6 +51,10 @@ public final class Ai {
      * Name that is used to qualify moderation models.
      */
     public static final String MODERATION_MODEL_NAME = "moderation-model";
+    /**
+     * Name that is used to qualify scoring models.
+     */
+    public static final String SCORING_MODEL_NAME = "scoring-model";
 
     private Ai() {
     }

integrations/langchain4j/providers/cohere/pom.xml

@@ -0,0 +1,166 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2025 Oracle and/or its affiliates.
+
+    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.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>io.helidon.integrations.langchain4j.providers</groupId>
+        <artifactId>helidon-integrations-langchain4j-providers-project</artifactId>
+        <version>4.2.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>helidon-integrations-langchain4j-providers-cohere</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.helidon.common</groupId>
+            <artifactId>helidon-common-config</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.common</groupId>
+            <artifactId>helidon-common-types</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.common</groupId>
+            <artifactId>helidon-common</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.service</groupId>
+            <artifactId>helidon-service-registry</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.builder</groupId>
+            <artifactId>helidon-builder-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.integrations.langchain4j</groupId>
+            <artifactId>helidon-integrations-langchain4j</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-cohere</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.common.features</groupId>
+            <artifactId>helidon-common-features-api</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.config</groupId>
+            <artifactId>helidon-config</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.config</groupId>
+            <artifactId>helidon-config-yaml</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>io.helidon.config.metadata</groupId>
+                            <artifactId>helidon-config-metadata-codegen</artifactId>
+                            <version>${helidon.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.helidon.codegen</groupId>
+                            <artifactId>helidon-codegen-apt</artifactId>
+                            <version>${helidon.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.helidon.builder</groupId>
+                            <artifactId>helidon-builder-codegen</artifactId>
+                            <version>${helidon.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.helidon.service</groupId>
+                            <artifactId>helidon-service-codegen</artifactId>
+                            <version>${helidon.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.helidon.codegen</groupId>
+                            <artifactId>helidon-codegen-helidon-copyright</artifactId>
+                            <version>${helidon.version}</version>
+                        </path>
+                        <path>
+                            <groupId>io.helidon.common.features</groupId>
+                            <artifactId>helidon-common-features-processor</artifactId>
+                            <version>${helidon.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>io.helidon.config.metadata</groupId>
+                        <artifactId>helidon-config-metadata-codegen</artifactId>
+                        <version>${helidon.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>io.helidon.codegen</groupId>
+                        <artifactId>helidon-codegen-apt</artifactId>
+                        <version>${helidon.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>io.helidon.builder</groupId>
+                        <artifactId>helidon-builder-codegen</artifactId>
+                        <version>${helidon.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>io.helidon.service</groupId>
+                        <artifactId>helidon-service-codegen</artifactId>
+                        <version>${helidon.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>io.helidon.codegen</groupId>
+                        <artifactId>helidon-codegen-helidon-copyright</artifactId>
+                        <version>${helidon.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>io.helidon.common.features</groupId>
+                        <artifactId>helidon-common-features-processor</artifactId>
+                        <version>${helidon.version}</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+        </plugins>
+    </build>
+</project>

integrations/langchain4j/providers/cohere/src/main/java/io/helidon/integrations/langchain4j/providers/cohere/Cohere.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2025 Oracle and/or its affiliates.
+ *
+ * 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 io.helidon.integrations.langchain4j.providers.cohere;
+
+import io.helidon.common.Weighted;
+import io.helidon.integrations.langchain4j.Ai;
+import io.helidon.service.registry.Qualifier;
+
+final class Cohere {
+    static final String COHERE = "cohere";
+    static final String SCORING_MODEL = COHERE + "." + Ai.SCORING_MODEL_NAME;
+    static final Qualifier COHERE_QUALIFIER = Qualifier.createNamed(COHERE);
+    static final double WEIGHT = Weighted.DEFAULT_WEIGHT - 20;
+
+    private Cohere() {
+    }
+}

integrations/langchain4j/providers/cohere/src/main/java/io/helidon/integrations/langchain4j/providers/cohere/CohereCommonConfig.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2025 Oracle and/or its affiliates.
+ *
+ * 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 io.helidon.integrations.langchain4j.providers.cohere;
+
+import java.time.Duration;
+import java.util.Map;
+import java.util.Optional;
+
+import io.helidon.builder.api.Option;
+
+interface CohereCommonConfig {
+    /**
+     * If set to {@code false} (default), Cohere model will not be available even if configured.
+     *
+     * @return whether Cohere model is enabled, defaults to {@code false}
+     */
+    @Option.Configured
+    boolean enabled();
+
+    /**
+     * The base URL for the Cohere API.
+     *
+     * @return the base URL
+     */
+    @Option.Configured
+    Optional<String> baseUrl();
+
+    /**
+     * The API key used to authenticate requests to the Cohere API.
+     *
+     * @return an {@link java.util.Optional} containing the API key
+     */
+    @Option.Configured
+    Optional<String> apiKey();
+
+    /**
+     * Whether to log API requests.
+     *
+     * @return an {@link java.util.Optional} containing true if requests should be logged, false otherwise
+     */
+    @Option.Configured
+    Optional<Boolean> logRequests();
+
+    /**
+     * Whether to log API responses.
+     *
+     * @return an {@link java.util.Optional} containing true if responses should be logged, false otherwise
+     */
+    @Option.Configured
+    Optional<Boolean> logResponses();
+
+    /**
+     * A map containing custom headers.
+     *
+     * @return custom headers map
+     */
+    @Option.Configured
+    @Option.Singular
+    Map<String, String> customHeaders();
+
+    /**
+     * The timeout setting for API requests.
+     *
+     * @return the timeout setting in {@link java.time.Duration#parse} format
+     */
+    @Option.Configured
+    Optional<Duration> timeout();
+
+    /**
+     * The model name to use (e.g., "gpt-3.5-turbo").
+     *
+     * @return the model name
+     */
+    @Option.Configured
+    Optional<String> modelName();
+}

integrations/langchain4j/providers/cohere/src/main/java/io/helidon/integrations/langchain4j/providers/cohere/CohereEmbeddingModelConfigBlueprint.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2025 Oracle and/or its affiliates.
+ *
+ * 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 io.helidon.integrations.langchain4j.providers.cohere;
+
+import java.util.Optional;
+
+import io.helidon.builder.api.Option;
+import io.helidon.builder.api.Prototype;
+
+/**
+ * Configuration for the Cohere embedding model, {@link dev.langchain4j.model.cohere.CohereEmbeddingModel}.
+ *
+ * @see dev.langchain4j.model.cohere.CohereEmbeddingModel
+ */
+@Prototype.Configured(CohereEmbeddingModelConfigBlueprint.CONFIG_ROOT)
+@Prototype.Blueprint
+interface CohereEmbeddingModelConfigBlueprint extends CohereCommonConfig {
+    /**
+     * Default configuration prefix.
+     */
+    String CONFIG_ROOT = "langchain4j.cohere.embedding-model";
+
+    /**
+     * Gets the input type.
+     *
+     * @return an {@link java.util.Optional} containing the input type
+     */
+    @Option.Configured
+    Optional<String> inputType();
+
+    /**
+     * Gets the maximum number of segments per batch.
+     *
+     * @return an {@link java.util.Optional} containing the maximum number of segments per batch
+     */
+    @Option.Configured
+    Optional<Integer> maxSegmentsPerBatch();
+}