docs: function calling example

openai-java-example/src/main/java/com/openai/example/FunctionCallingAsyncExample.java

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+package com.openai.example;
+
+import static com.openai.core.ObjectMappers.jsonMapper;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.openai.client.OpenAIClientAsync;
+import com.openai.client.okhttp.OpenAIOkHttpClientAsync;
+import com.openai.core.JsonObject;
+import com.openai.core.JsonValue;
+import com.openai.models.*;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+public final class FunctionCallingAsyncExample {
+    private FunctionCallingAsyncExample() {}
+
+    public static void main(String[] args) {
+        // Configures using one of:
+        // - The `OPENAI_API_KEY` environment variable
+        // - The `AZURE_OPENAI_ENDPOINT` and `AZURE_OPENAI_KEY` environment variables
+        OpenAIClientAsync client = OpenAIOkHttpClientAsync.fromEnv();
+
+        ChatCompletionCreateParams createParams = ChatCompletionCreateParams.builder()
+                .model(ChatModel.GPT_3_5_TURBO)
+                .maxCompletionTokens(2048)
+                .addTool(ChatCompletionTool.builder()
+                        .function(FunctionDefinition.builder()
+                                .name("get-sdk-quality")
+                                .description("Gets the quality of the given SDK.")
+                                .parameters(FunctionParameters.builder()
+                                        .putAdditionalProperty("type", JsonValue.from("object"))
+                                        .putAdditionalProperty(
+                                                "properties", JsonValue.from(Map.of("name", Map.of("type", "string"))))
+                                        .putAdditionalProperty("required", JsonValue.from(List.of("name")))
+                                        .putAdditionalProperty("additionalProperties", JsonValue.from(false))
+                                        .build())
+                                .build())
+                        .build())
+                .addUserMessage("How good are the following SDKs: OpenAI Java SDK, Unknown Company SDK")
+                .build();
+
+        client.chat()
+                .completions()
+                .create(createParams)
+                .thenAccept(completion -> completion.choices().stream()
+                        .map(ChatCompletion.Choice::message)
+                        .flatMap(message -> {
+                            message.content().ifPresent(System.out::println);
+                            return message.toolCalls().stream().flatMap(Collection::stream);
+                        })
+                        .forEach(toolCall -> System.out.println(callFunction(toolCall.function()))))
+                .join();
+    }
+
+    private static String callFunction(ChatCompletionMessageToolCall.Function function) {
+        if (!function.name().equals("get-sdk-quality")) {
+            throw new IllegalArgumentException("Unknown function: " + function.name());
+        }
+
+        JsonValue arguments;
+        try {
+            arguments = JsonValue.from(jsonMapper().readTree(function.arguments()));
+        } catch (JsonProcessingException e) {
+            throw new IllegalArgumentException("Bad function arguments", e);
+        }
+
+        String sdkName = ((JsonObject) arguments).values().get("name").asStringOrThrow();
+        if (sdkName.contains("OpenAI")) {
+            return sdkName + ": It's robust and polished!";
+        }
+
+        return sdkName + ": *shrug*";
+    }
+}

openai-java-example/src/main/java/com/openai/example/FunctionCallingExample.java

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+package com.openai.example;
+
+import static com.openai.core.ObjectMappers.jsonMapper;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.openai.client.OpenAIClient;
+import com.openai.client.okhttp.OpenAIOkHttpClient;
+import com.openai.core.JsonObject;
+import com.openai.core.JsonValue;
+import com.openai.models.*;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+public final class FunctionCallingExample {
+    private FunctionCallingExample() {}
+
+    public static void main(String[] args) {
+        // Configures using one of:
+        // - The `OPENAI_API_KEY` environment variable
+        // - The `AZURE_OPENAI_ENDPOINT` and `AZURE_OPENAI_KEY` environment variables
+        OpenAIClient client = OpenAIOkHttpClient.fromEnv();
+
+        ChatCompletionCreateParams createParams = ChatCompletionCreateParams.builder()
+                .model(ChatModel.GPT_3_5_TURBO)
+                .maxCompletionTokens(2048)
+                .addTool(ChatCompletionTool.builder()
+                        .function(FunctionDefinition.builder()
+                                .name("get-sdk-quality")
+                                .description("Gets the quality of the given SDK.")
+                                .parameters(FunctionParameters.builder()
+                                        .putAdditionalProperty("type", JsonValue.from("object"))
+                                        .putAdditionalProperty(
+                                                "properties", JsonValue.from(Map.of("name", Map.of("type", "string"))))
+                                        .putAdditionalProperty("required", JsonValue.from(List.of("name")))
+                                        .putAdditionalProperty("additionalProperties", JsonValue.from(false))
+                                        .build())
+                                .build())
+                        .build())
+                .addUserMessage("How good are the following SDKs: OpenAI Java SDK, Unknown Company SDK")
+                .build();
+
+        client.chat().completions().create(createParams).choices().stream()
+                .map(ChatCompletion.Choice::message)
+                .flatMap(message -> {
+                    message.content().ifPresent(System.out::println);
+                    return message.toolCalls().stream().flatMap(Collection::stream);
+                })
+                .forEach(toolCall -> System.out.println(callFunction(toolCall.function())));
+    }
+
+    private static String callFunction(ChatCompletionMessageToolCall.Function function) {
+        if (!function.name().equals("get-sdk-quality")) {
+            throw new IllegalArgumentException("Unknown function: " + function.name());
+        }
+
+        JsonValue arguments;
+        try {
+            arguments = JsonValue.from(jsonMapper().readTree(function.arguments()));
+        } catch (JsonProcessingException e) {
+            throw new IllegalArgumentException("Bad function arguments", e);
+        }
+
+        String sdkName = ((JsonObject) arguments).values().get("name").asStringOrThrow();
+        if (sdkName.contains("OpenAI")) {
+            return sdkName + ": It's robust and polished!";
+        }
+
+        return sdkName + ": *shrug*";
+    }
+}