RMI

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RMI

• J2EE I
• ?? / 2006-02-25

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??????

• ?????????????????
• RMI ?????????

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??URL

• JavaTM Remote Method Invocation (RMI)
• http//java.sun.com/j2se/1.5.0/ja/docs/ja/guide/rm
  i/index.html
• Sun Microsystems ??? RMI ??????

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????????
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????????

• ??????????????????????????????????

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??????????

• CORBA
• DCOM
• RPC ?
• Java RMI
• Peer to Peer (P2P) ?
• ????

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RMI ????
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RMI ??

• Remote Method Invocation (??????????) ??
• ?? Java Virtual Machine ?????????????????
• Java Virtula Machine ????????????????
• ????????????????

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???Java????????

• Hello ????????????????
• ????????? sayHello ??????????

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RMI???
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RMI ???

• ??????? Hello ????????????????
• ????????????????? sayHello ??????????
• Hello ???????????????
• ???? sayHello ?????????????????????????

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RMI ??????????

• Hello ???????????????????????????????????????
• ??????????????????????????????????

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RMI????
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??????????

• ??????????????????????????????
• ??????????????????????????????

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?????????

• RMI ??????????????????????????????????????
• ???????????????????????? or??????????

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rmiregistry

• ????????????????????????
• ??????? rmiregistry ???????????????????

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RPC (Remote Procedure Call)

• RMI ?????????
• Sun Microsystems ??????????
• ????????????????????????
• Unix, Windows ??????????

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RMI ??????????
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Remote??????? (1)

• import java.rmi.Remote
• import java.rmi.RemoteException
• public interface Hello extends Remote
• public String sayHello()
• throws RemoteException

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Remote??????? (2)

• ???????????????????????
• ????????????????????
• ??????????????????????????
• java.rmi.Remote ??????
• ???????????RemoteException ????????????

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?????????? (1)??????

• public class Server implements Hello
• ......

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?????????? (2)??????

• Hello ?????????????

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?????????? (3)????

• public String sayHello()
• return "Hello world!"

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?????????? (4)????

• ???????????????????????

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?????????? (6)main???? (1)

• // ?????????
• Server obj new Server()
• // ??????
• Hello stub (Hello)
• UnicastRemoteObject.exportObject(obj, 0)

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?????????? (7)main???? (2)

• // rmiregistry ?????????
• Registry registry
• LocateRegistry.getRegistry()
• registry.bind("Hello", stub)

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????????????? (1)

• // rmiregistry ???????????
• Registry registry
• LocateRegistry.getRegistry(host)
• Hello stub (Hello) registry.lookup("Hello")

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????????????? (2)

• // ???? sayHello ?????????
• String response stub.sayHello()

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RMI ????
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???????????

• javac Hello.java
• javac Server.java
• javac Client.java

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??????????????????????

• ????
• Hello.class
• Server.class

• ???????
• Hello.class
• Client.class

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rmiregistry ???

• start rmiregistry
• ??????? rmiregistry ???
• ??????????????????????

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??????

• java Server

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?????????

• java Client

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?????????????
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??????????main????????

• // ?????????????????
• if (System.getSecurityManager() null)
• System.setSecurityManager(
• new RMISecurityManager()
• )

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??? (??????)???

• rmic Server
• ?????????????2????????????
• Server_Stub.class
• rmic keep Server ??????????????????????????????

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??????????????????????

• ????
• Hello.class
• Server.class
• ???
• policy.txt (??)

• ???????
• Hello.class
• Client.class
• policy.txt (??)

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?????? (1)???????

• java -Djava.rmi.server.codebase
• file///C\Home\rmi\
• -Djava.security.policypolicy.txt Server
  localhost

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?????? (2)codebase (1)

• java.rmi.server.codebase
• file///C\Home\rmi\
• codebase ??????????????????
• ??????C\Home\rmi\ ???????????

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?????? (3)codebase (2)

• C\Home\rmi\
• ??? \ ?????
• Codebase ?? Web?? URL ????????????
• http//www.wakhok.ac.jp/tomoharu/
• ?? URL ??????????

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?????? (4)codebase (3)

• ??????????????codebase ?????? URL
  ????????????????????????????????????????????

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?????? (5)???????????

• java.security.policypolicy.txt
• policy.txt ????????????????????

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?????? (6)policy.txt ???

• grant
• // Allow everything for now
• permission java.security.AllPermission
• ???????????????????

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?????????

• java -Djava.security.policypolicy.txt Client
  localhost

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???

• Cygwin ??????????? (?????)?
• ?????????????????????????????
• ??????????????????????????????????????????????????
  ?????????