Java RMI - 客户端超时
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Java RMI - Client Timeout
提问by Joao Guilherme
I'm building a Distributed System using Java RMI and it must support a server loss.
我正在使用 Java RMI 构建分布式系统，它必须支持服务器丢失。
If my client is connected to a Server using RMI, if this server goes down (cable problems for example), my client should get an exception so it can connect to other server.
如果我的客户端使用 RMI 连接到服务器，如果该服务器出现故障（例如电缆问题），我的客户端应该得到一个异常，以便它可以连接到其他服务器。
But when the server goes down, nothing happens to my client, he keeps waiting for the reply. How can I set a timeout for that?
但是当服务器出现故障时，我的客户没有任何反应，他一直在等待回复。如何为此设置超时？
回答by oxbow_lakes
There is a system property that you can set.
Something like sun.rmi.transport.connectionTimeout
您可以设置一个系统属性。
就像是sun.rmi.transport.connectionTimeout
They are detailed here:
https://docs.oracle.com/javase/7/docs/technotes/guides/rmi/sunrmiproperties.html
它们在此处详细说明：https:
//docs.oracle.com/javase/7/docs/technotes/guides/rmi/sunrmiproperties.html
回答by ZZ Coder
For socket read timeout, you can set your own factory like this,
对于套接字读取超时，您可以像这样设置自己的工厂，
RMISocketFactory.setSocketFactory( new RMISocketFactory()
{
public Socket createSocket( String host, int port )
throws IOException
{
Socket socket = new Socket();
socket.setSoTimeout( timeoutMillis );
socket.setSoLinger( false, 0 );
socket.connect( new InetSocketAddress( host, port ), timeoutMillis );
return socket;
}
public ServerSocket createServerSocket( int port )
throws IOException
{
return new ServerSocket( port );
}
} );
回答by Noky
I recently encountered this problem as well and found that I needed to set the following Java property in order for an RMI call to timeout on the client side:
我最近也遇到了这个问题，发现我需要设置以下 Java 属性，以便 RMI 调用在客户端超时：
sun.rmi.transport.tcp.responseTimeout
Here is the full scoop on these params in newer versions of Java:
以下是在较新版本的 Java 中对这些参数的完整介绍：
回答by user3399000
You can use custom socket factories. It works fine , It is not static and deprecated and against the system property, it does not apply to the whole JVM. But the point is that the code is on the server side.
您可以使用自定义套接字工厂。它工作正常，它不是静态的和不推荐使用的，并且不符合系统属性，它不适用于整个 JVM。但关键是代码在服务器端。
回答by shirin
tomcat config: go to vmoptions set -Dsun.rmi.transport.tcp.responseTimeout=30000 (milliseconds)
tomcat 配置：转到 vmoptions 设置 -Dsun.rmi.transport.tcp.responseTimeout=30000（毫秒）
websphere config: go to Application servers > server1 > Process definition > Java Virtual Machine set -Dsun.rmi.transport.tcp.responseTimeout=30000 in Generic JVM arguments section
websphere 配置：转到应用程序服务器 > server1 > 进程定义 > Java 虚拟机 set -Dsun.rmi.transport.tcp.responseTimeout=30000 在通用 JVM 参数部分
