private void functionCallGeminiWithREST()

in ai-patterns/langchain4j-function-calling/src/main/java/services/gemini/Langchain4JFunctionCallingApplication.java [135:165]

• 24 lines of code
• 1 McCabe index (conditional complexity)

	private void  functionCallGeminiWithREST(String userMessage) {
			long start = System.currentTimeMillis();

			VertexAI vertexAi = new VertexAI.Builder().setProjectId(project).setLocation(location).setTransport(Transport.REST).build();
			GenerativeModel generativeModel = new GenerativeModel(chatModel, vertexAi);
			GenerationConfig generationConfig = GenerationConfig.newBuilder().setTemperature(0.2f).setMaxOutputTokens(1000).build();

			// ChatLanguageModel model = new VertexAiGeminiChatModel(generativeModel, generationConfig, 1);
		ChatLanguageModel model = VertexAiGeminiChatModel. builder()
				.project(project)
				.location(location)
				.modelName(chatModel)
				.temperature(0.2f)
				.maxOutputTokens(1000)
				.logRequests(true)
				.logResponses(true)
				.build();


			FunctionCallingService service = new FunctionCallingService();

			Assistant assistant = AiServices.builder(Assistant.class)
					.chatLanguageModel(model)
					.chatMemory(MessageWindowChatMemory.withMaxMessages(10))
					.tools(service)
					.build();

			System.out.println("User message: " + userMessage);
			System.out.println(assistant.chat(userMessage));
			System.out.println("VertexAI Gemini call using REST took " + (System.currentTimeMillis() - start) + " ms");
	}