[英]How to pass object in arguments in RMI method?
我試圖在RMI方法中添加參數。 當我添加例如String
一切正常。 但我不確定我是否可以傳遞我創建的對象。 我是RMI的新手,所以我的代碼非常簡單:
HelloIF
public interface HelloIF extends Remote {
String greeting(Context c) throws RemoteException;
}
你好
public class Hello extends UnicastRemoteObject implements HelloIF {
public Hello() throws RemoteException {
}
public String greeting(Context c) throws RemoteException {
addToContext(c);
report(c);
return "greeting";
}
void addToContext(Context c) {
c.addID(Thread.currentThread().getId());
}
void report(Context c) {
System.out.println("Hello.greeting() thread : "
+ Thread.currentThread().getName() + " "
+ Thread.currentThread().getId());
System.out.println("Hello.greeting() context : "
+ c.getDistributedThreadName() + " " + c.getRequestType());
}
}
為RMIServer
public class RMIServer {
public static void main(String[] args) throws RemoteException, MalformedURLException {
LocateRegistry.createRegistry(1099);
HelloIF hello = new Hello();
Naming.rebind("server.Hello", hello);
System.out.println("server.RMI Server is ready.");
System.out.println("RMIServer.main() thread : " + Thread.currentThread().getName()
+ " " + Thread.currentThread().getId());
}
}
RMIClient
public class RMIClient {
public static void main(String[] args) throws RemoteException, MalformedURLException, NotBoundException {
Context context = new Context("request1", Thread.currentThread().getName()+System.currentTimeMillis());
Registry registry = LocateRegistry.getRegistry("localhost");
HelloIF hello = (HelloIF) registry.lookup("server.Hello");
System.out.println(hello.greeting(context));
System.out.println("RMIClient.mian() thread : " + Thread.currentThread().getName()
+ " " + Thread.currentThread().getId());
}
}
最后我的班級上下文
public class Context
{
private String requestType;
private String distributedThreadName;
private List<Long> IDList;
(...) getters/setters
}
我該怎么做才能使傳遞上下文成為可能?
您的對象應該實現Serializable
。 我可以看到這將是一個問題。 這是必需的,因為兩個部分之間的通信是使用序列化完成的,因此需要發送到其他部分的每個對象都需要是實現Serializable
的類的實例。
public class Context implements Serializable
{
private String requestType;
private String distributedThreadName;
private List<Long> IDList;
(...) getters/setters
}
請添加一個serialVersionUID
作為一個好習慣。 就像是:
private static final long serialVersionUID = 20120731125400L;
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