Succeeded in deploying verticle but I get this error : Result is already complete: succeeded

Question

我成功部署了垂直，但我仍然收到此错误：结果已经完成：成功。我不明白为什么，我需要一些解释这是我的 Deploy class :

public class Deploy {
private static Logger logger = LogManager.getLogger(Deploy.class);

private static void deployAsynchronousVerticalByIndex(Vertx vertx, int indexCurrentDeploy, JsonArray verticalArray, Future<Void> startFuture, JsonObject jsonObjectConfig) {
    JsonObject currentVertical = verticalArray.getJsonObject(indexCurrentDeploy);
    currentVertical.forEach(entry -> {
        logger.debug("Starting deploy of class: " + entry.getKey() + ", With the config: " + entry.getValue() + ".");

        DeploymentOptions optionsDeploy = new DeploymentOptions().setConfig(jsonObjectConfig);
        ObservableFuture<String> observable = RxHelper.observableFuture();
        vertx.deployVerticle(entry.getKey(), optionsDeploy, observable.toHandler());

        observable.subscribe(id -> {
            logger.info("Class " + entry.getKey() + " deployed.");
            if (indexCurrentDeploy + 1 < verticalArray.size()) {
                deployAsynchronousVerticalByIndex(vertx, indexCurrentDeploy + 1, verticalArray, startFuture, jsonObjectConfig);
            } else {
                logger.info("ALL classes are deployed.");
                startFuture.complete();
            }
        }, err -> {
            logger.error(err, err);
            startFuture.fail(err.getMessage());
        });
    });
}

public static void deployAsynchronousVertical(Vertx vertx, JsonArray verticalArray, Future<Void> startFuture, JsonObject jsonObjectConfig) {
    deployAsynchronousVerticalByIndex(vertx, 0, verticalArray, startFuture, jsonObjectConfig);
}

}

Answer 1

那是因为你在 Verticle 之间重用了你的 future，并且那里存在竞争条件。

最简单的解决方法是：

if (startFuture.isComplete()) {
   startFuture.complete();    
}

但这实际上只会掩盖问题。

将您的可观察对象从循环中提取出来，因此它实际上只会为每个顶点侦听一次。

    JsonObject currentVertical = verticalArray.getJsonObject(indexCurrentDeploy);
    ObservableFuture<String> observable = RxHelper.observableFuture();
    currentVertical.forEach(entry -> {
    logger.debug("Starting deploy of class: " + entry.getKey() + ", With the config: " + entry.getValue() + ".");

        DeploymentOptions optionsDeploy = new DeploymentOptions().setConfig(jsonObjectConfig);

        vertx.deployVerticle(entry.getKey(), optionsDeploy, observable.toHandler());
    });

    observable.subscribe(id -> {
        logger.info("Class " + id + " deployed.");
        if (indexCurrentDeploy + 1 < verticalArray.size()) {
            deployAsynchronousVerticalByIndex(vertx, indexCurrentDeploy + 1, verticalArray, startFuture, jsonObjectConfig);
        } else {
            logger.info("ALL classes are deployed.");

            if (startFuture.isComplete()) {
                startFuture.complete();
            }
        }
    }, err -> {
        logger.error(err, err);
        startFuture.fail(err.getMessage());
    });

Answer 2

并且除了从循环中提取您的可观察对象之外，使用 io.vertx.core.Promise 代替 io.vertx.core.Future 是个好主意。并使用 promise.tryXXXX()

根据 io.vertx.core.Promise.java 文档：

Future is @deprecated. instead use Promise.

tryFail is Like fail but returns false when the promise is already completed instead of throwing IllegalStateException. and it returns true otherwise.

所以... 而不是

if (startFuture.isComplete()) 
    startFuture.complete();
if (startFuture.isFail()) 
    startFuture.fail(err.getMessage());

使用

promise.tryComplete()
promise.tryFail(err.getMessage());

Succeeded in deploying verticle but I get this error : Result is already complete: succeeded

Succeeded in deploying verticle but I get this error : Result is already complete: succeeded

java

vert.x