[Java][Vertx] Add option to generate methods that return Futures

Author: RickyRister

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java

@@ -101,6 +101,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     public static final String WEBCLIENT_BLOCKING_OPERATIONS = "webclientBlockingOperations";
     public static final String USE_ENUM_CASE_INSENSITIVE = "useEnumCaseInsensitive";
     public static final String FAIL_ON_UNKNOWN_PROPERTIES = "failOnUnknownProperties";
+    public static final String SUPPORT_VERTX_FUTURE = "supportVertxFuture";
 
     public static final String SERIALIZATION_LIBRARY_GSON = "gson";
     public static final String SERIALIZATION_LIBRARY_JACKSON = "jackson";
@@ -243,6 +244,7 @@ public JavaClientCodegen() {
         cliOptions.add(CliOption.newBoolean(SUPPORT_URL_QUERY, "Generate toUrlQueryString in POJO (default to true). Available on `native`, `apache-httpclient` libraries."));
         cliOptions.add(CliOption.newBoolean(USE_ENUM_CASE_INSENSITIVE, "Use `equalsIgnoreCase` when String for enum comparison", useEnumCaseInsensitive));
         cliOptions.add(CliOption.newBoolean(FAIL_ON_UNKNOWN_PROPERTIES, "Fail Jackson de-serialization on unknown properties", this.failOnUnknownProperties));
+        cliOptions.add(CliOption.newBoolean(SUPPORT_VERTX_FUTURE, "Also generate api methods that return a vertx Future instead of taking a callback. Only `vertx` supports this option. Requires vertx 4 or greater."));
 
         supportedLibraries.put(JERSEY2, "HTTP client: Jersey client 2.25.1. JSON processing: Jackson 2.17.1");
         supportedLibraries.put(JERSEY3, "HTTP client: Jersey client 3.1.1. JSON processing: Jackson 2.17.1");

modules/openapi-generator/src/main/resources/Java/libraries/vertx/api.mustache

@@ -5,6 +5,10 @@ import {{invokerPackage}}.ApiClient;
 {{/imports}}
 import io.vertx.core.AsyncResult;
 import io.vertx.core.Handler;
+{{#supportVertxFuture}}
+import io.vertx.core.Future;
+import io.vertx.core.Promise;
+{{/supportVertxFuture}}
 import io.vertx.core.json.JsonObject;
 
 import java.util.*;
@@ -18,11 +22,33 @@ public interface {{classname}} {
     {{/isDeprecated}}
     void {{operationId}}({{#allParams}}{{>nullable_var_annotations}} {{{dataType}}} {{paramName}}, {{/allParams}}Handler<AsyncResult<{{{returnType}}}{{^returnType}}Void{{/returnType}}>> handler);
 
+    {{#supportVertxFuture}}
+    {{#isDeprecated}}
+    @Deprecated
+    {{/isDeprecated}}
+    default Future<{{{returnType}}}{{^returnType}}Void{{/returnType}}> {{operationId}}({{#allParams}}{{>nullable_var_annotations}} {{{dataType}}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}){
+        Promise<{{{returnType}}}{{^returnType}}Void{{/returnType}}> promise = Promise.promise();
+        {{operationId}}({{#allParams}}{{paramName}}, {{/allParams}}promise);
+        return promise.future();
+    }
+
+    {{/supportVertxFuture}}
     {{#isDeprecated}}
     @Deprecated
     {{/isDeprecated}}
     void {{operationId}}({{#allParams}}{{>nullable_var_annotations}} {{{dataType}}} {{paramName}}, {{/allParams}}ApiClient.AuthInfo authInfo, Handler<AsyncResult<{{{returnType}}}{{^returnType}}Void{{/returnType}}>> handler);
 
+    {{#supportVertxFuture}}
+    {{#isDeprecated}}
+    @Deprecated
+    {{/isDeprecated}}
+    default Future<{{{returnType}}}{{^returnType}}Void{{/returnType}}> {{operationId}}({{#allParams}}{{>nullable_var_annotations}} {{{dataType}}} {{paramName}}, {{/allParams}}ApiClient.AuthInfo authInfo){
+        Promise<{{{returnType}}}{{^returnType}}Void{{/returnType}}> promise = Promise.promise();
+        {{operationId}}({{#allParams}}{{paramName}}, {{/allParams}}authInfo, promise);
+        return promise.future();
+    }
+
+    {{/supportVertxFuture}}
     {{/operation}}
     {{/operations}}
 }

modules/openapi-generator/src/main/resources/Java/libraries/vertx/build.gradle.mustache

@@ -32,7 +32,7 @@ ext {
     swagger_annotations_version = "1.5.21"
     jackson_version = "2.17.1"
     jackson_databind_version = "2.17.1"
-    vertx_version = "3.5.2"
+    vertx_version = "{{#supportVertxFuture}}4.0.0{{/supportVertxFuture}}{{^supportVertxFuture}}3.5.2{{/supportVertxFuture}}"
     junit_version = "5.10.3"
     {{#openApiNullable}}
     jackson_databind_nullable_version = "0.2.6"

modules/openapi-generator/src/main/resources/Java/libraries/vertx/pom.mustache

@@ -299,7 +299,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <vertx-version>3.5.2</vertx-version>
+        <vertx-version>{{#supportVertxFuture}}4.0.0{{/supportVertxFuture}}{{^supportVertxFuture}}3.5.2{{/supportVertxFuture}}</vertx-version>
         {{#swagger1AnnotationLibrary}}
         <swagger-annotations-version>1.6.6</swagger-annotations-version>
         {{/swagger1AnnotationLibrary}}