没有远程出站连接的Wildfly到Wildfly EJB客户端 [英] Wildfly to Wildfly EJB client without remote-outbound-connections

问题描述

我希望能够有两个Wildfly(或JBoss 7)实例，其中一台服务器与另一台服务器上的EJB进行通信.棘手的部分是根据文档，需要创建带有出站套接字绑定的远程出站连接.对于我们的运营团队而言，这是一个很大的麻烦，尤其是当我们要扩展时.

I'd like to be able to have two Wildfly (or JBoss 7) instances where one of the servers talks to EJBs on the other server. The tricky part is that according to documentation, remote-outbound-connections with outbound-socket-bindings need to be created. This is a big hassle for our Operations team, especially when we want to scale out.

Wildfly实例是否可以通过编程方式指定远程主机来在另一个Wildfly实例上调用EJB?

Is there any way for a Wildfly instance to call EJB's on another Wildfly instance by programmatically specifying the remote host?

我已经能够让Tomcat 7调用Wildfly EJB.我对org.jboss.as:jboss-as-ejb-client-bom:7.5.0.Final-redhat-21添加了Maven依赖关系，并根据

I've been able to have Tomcat 7 invoke Wildfly EJB's. I added a Maven dependency on org.jboss.as:jboss-as-ejb-client-bom:7.5.0.Final-redhat-21 and set up connection settings according to this documentation.

谢谢！

编辑

当我尝试在Tomcat 7(使用jboss-ejb-client库)中使用的相同代码时，当我的代码尝试执行EJBClientContext.setSelector( selector )时，出现错误EJBCLIENT000021: EJB client context selector may not be changed.我正在以编程方式设置远程连接主机和端口，而不是使用jboss-ejb-client.properties.

When I try the same code that worked in Tomcat 7 (which uses the jboss-ejb-client library), I get the error EJBCLIENT000021: EJB client context selector may not be changed when my code tries to do EJBClientContext.setSelector( selector ). I am setting the remote connection host and port programmatically instead of using jboss-ejb-client.properties.

推荐答案

jgitter的答案为我提供了大部分帮助.这就是我最终得到的:

jgitter's answer got me most of the way there. Here's what I ended up with:

  /**
   * @return a reference to the EJB
   * @throws EjbLookupException
   */
  @NotNull
  public T lookup ()
     throws EjbLookupException
  {
     String path = createJndiPath();
     Context initialContext = null;
     try
     {
        initialContext = createInitialContext();

        //noinspection unchecked
        final T ejb = (T)initialContext.lookup( path );

        if( m_apiVersion != null )
        {
           ( (RemoteAPI)ejb ).validateClientCompatibility( m_apiVersion );
        }

        return ejb;
     }
     catch( NamingException | RuntimeException e )
     {
        throw new EjbLookupException( "Unable to find the JBoss EJB at " + path, e );
     }
     finally
     {
        if( initialContext != null )
        {
           //noinspection ThrowableResultOfMethodCallIgnored
           Closer.close( initialContext );
        }
     }
  }

  /**
   * There are a lot of ways to do JBoss 7 / Wildfly EJB lookups.  Using this method, we don't have to create
   * outbound socket bindings whenever we want to use a remote EJB.
   *
   * @throws NamingException
   */
  @NotNull
  private Context createInitialContext ()
     throws NamingException
  {
     Properties properties = new Properties();

     properties.put( Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming" );
     properties.put( "org.jboss.ejb.client.scoped.context", "true" );
     properties.put( "remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED", "false" );
     properties.put( "remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS", "false" );
     properties.put( "remote.connections", "default" );

     properties.put( "remote.connection.default.host", m_host );
     properties.put( "remote.connection.default.port", String.valueOf( m_port ) );

     if( m_username != null )
     {
        properties.put( "remote.connection.default.username", m_username );
     }
     if( m_password != null )
     {
        properties.put( "remote.connection.default.password", m_password );
     }

     return new InitialContext( properties );
  }

  public static class EjbLookupException
     extends Exception
  {
     EjbLookupException (
        @NotNull String message,
        @NotNull Throwable cause )
     {
        super( message, cause );
     }
  }

我不确定是否需要作用域上下文，并且我可能无法正确关闭连接.我将根据发现的情况更新此答案.

I'm not sure if I need a scoped context, and I may not be closing the connection properly. I'll update this answer based on what I find out.

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