Question

我在域中配置了两个Wildfly服务器，我需要创建一个与HA一起运行的单例。我需要它只在一台服务器上运行，如果该服务器出现故障，它应该在从服务器中启动。我正在使用defult配置，我只在WAR中创建了“/META-INF/singleton-deployment.xml”。当我部署WAR时，它会在两个服务器中启动！不仅仅是一个。缺什么？我是否需要在domain.xml中编辑某些内容？

我的单身人士只将文本写入日志文件和控制台，仅用于测试：

import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.ejb.ConcurrencyManagement;
import javax.ejb.ConcurrencyManagementType;
import javax.ejb.Schedule;
import javax.ejb.Singleton;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)
@Singleton
public class TesteAPP {

    final Logger logger = LogManager.getLogger(TesteAPP.class);

    @Schedule(second = "*/1", minute = "*", hour = "*", persistent = false)
public void executaTarefa() {
    try {
        logger.log(Level.INFO, "Tarefa executada com sucesso! Nome da         máquina: {} Endereço da máquina: {}",
                InetAddress.getLocalHost().getHostName(),
                InetAddress.getLocalHost().getHostAddress());
        System.out.println(String.format("Tarefa executada com sucesso! Nome da máquina: %s Endereço da máquina: %s",
                InetAddress.getLocalHost().getHostName(),
                InetAddress.getLocalHost().getHostAddress()));
    } catch (UnknownHostException e) {
        logger.log(Level.ALL, "Tarefa executada com sucesso!");
        System.out.println(String.format("Tarefa executada com sucesso!"));
    }
}


}

Answer 1

在https://stackoverflow.com/a/27956003/653069

中得到了解答

根据EJB 3.1规范，@Singleton只是每个JVM而不是每个群集。

如果容器分布在许多虚拟机上，则每个应用程序将为每个JVM配备一个Singleton的bean实例。

尽管如此，您可以使用JBoss特定的方式。看一下cluster-ha-singleton quickstart - EAP 7.0，它也适用于WildFly 10.x.

Wildfly 10.1.0 Singleton不起作用

1 个答案: