不兼容类型：单个<HttpServer>无法转换为可组合

Question

我正在尝试在眩晕中使用 Vert.x 中的RxJava2：

import io.reactivex.Completable;
import io.vertx.core.Promise;
public class MainVerticle extends io.vertx.reactivex.core.AbstractVerticle {

@Override
public Completable rxStart() {
return vertx.createHttpServer().requestHandler(req -> {
req.response()
.putHeader("content-type", "text/plain")
.end("Hello from Vert.x!");
})
.rxListen(8080);
}
}

编译抱怨：

error: incompatible types: Single<HttpServer> cannot be converted to Completable
.rxListen(8080);
^
1 error
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

我不知道，我应该调用哪种方法。

Answer 1

Single<HttpServer> rxListen(int port,String host)

从问题中返回单个实例 不兼容 不清楚您要做什么，但是如果您想在端口上侦听，则需要执行以下操作

public class MyVerticle extends AbstractVerticle {
private HttpServer server;
public void start(Future<Void> startFuture) {
server = vertx.createHttpServer().requestHandler(req -> {
req.response()
.putHeader("content-type", "text/plain")
.end("Hello from Vert.x!");
});
// Now bind the server:
server.listen(8080, res -> {
if (res.succeeded()) {
startFuture.complete();
} else {
startFuture.fail(res.cause());
}
});
}
}

如果要使用 Completable，则需要订阅服务器并调用方法rxClose

Completable single = server.rxClose();
// Subscribe to bind the server
single.
subscribe(
() -> {
// Server is closed
},
failure -> {
// Server closed but encoutered issue
}
);