Caltech, CS 141

Excerpt: ... Review of Last Class Contracts and Inheritance Let me discuss contracts and inheritance now (partially a repeat from last class). We approach this issue from a purely theoretical viewpoint first: the viewpoint of refinement Later, we'll approach this problem from a practical viewpoint: that of code reuse An action s' is a refinement of action s if and only if s' can be used in place of s at any point in a program text. CS 141b - Distributed Computation Laboratory http:/www.cs.caltech.edu/~cs141/ Remote Method Invocation 20 January 2004 1 Review: Contracts & Inheritance class B { . / precondition p, postcondition q for method s: {p} s {q} /@ require p; /@ ensure q; public Object s(.) {.} } class C extends B { . / precondition p', postcondition q' for method s: {p'} s {q'} /@ require p'; /@ ensure q'; public Object s(.) {.} } CS 141b - Distributed Computation Laboratory http:/www.cs.caltech.edu/~cs141/ Remote Method Invocation 20 January 2004 2 Contracts and Inheritance If class C ...

University of Louisiana at Lafayette, FDD 360

Excerpt: ... Remote Method Invocation 1 Example RMI Project Using NetBeans 1) go to Tools -> Update Center and download the RMI package 2) select the template for the Remote interface 3) create the interface method headers (for the remote methods) 4) example: / file RMIInterface.java import java.rmi.*; public interface RMIInterface extends java.rmi.Remote { public int ComputeSquare(int n) throws java.rmi.RemoteException; } Remote Method Invocation 2 Example RMI Project Using NetBeans (continued) 5) select the template UnicastRemoteObject, implementing the remote interface created in step #1 6) implement the interface methods 7) example: / file RMIServer.java import java.rmi.*; import java.rmi.server.*; import java.rmi.registry.*; import java.net.MalformedURLException; public class RMIServer extends java.rmi.server.UnicastRemoteObject implements RMIInterface { Remote Method Invocation 3 Example RMI Project Using NetBeans (continued) 7) example (continued): public static void registerToRegistry (String name, Rem ...

Princeton, CS 597

Excerpt: ... ager, Solaris sunburst design, Solstice, SunCore, SolarNet, SunWeb, Sun Workstation, The Network Is The Computer, ToolTalk, Ultra, Ultracomputing, Ultraserver, Where The Network Is Going, Sun WorkShop, XView, Java WorkShop, the Java Coffee Cup logo, and Visual Java are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. Page ii Jini Technology Glossary1.0 Jini Technology Glossary activation: The process of transforming a passive object into an active object. Activation requires that an object be associated with a Java Virtual Machine (JVM), which may entail loading the class for that object into a JVM and the object restoring its persistent state (if any). (Java Remote Method Invocation Specication, Section 7.1.1) activation descriptor: A class instance which holds an activatable objects group identier (species the JVM in which it is activated), the objects class name, a location from where to load the objects class code, an ...

Old Dominion, CS 775

Excerpt: ... CS 775/875: Fall 2001 Chapter 5: Distributed Objects and Remote Invocation Terminology Remote procedure call (RPC) Remote method invocation (RMI) Middleware: RMI,RPC,RR, XDR Interface definition language (IDL) CORBA IDL: struct Person { string name; string place; long year;} interface PersonList { readonly attribute string listname; void addPerson(in Person p); void getperson(in string name, out Person p); long number(); }; Communication between distributed objects The object model: Object reference, interfaces, actions, exceptions, garbage collection Distributed objects: Client-server or other architectures Distributed object model: Remote method invocation (when invoker is in a different process than the object), remote object references, remote interfaces, actions (RMI), garbage collection, exceptions Design Issues for RMI Local invocations are always exactly-once; but RMI has other options-maybe, at-least-once, atmost-once Transparency-no distinction between local and remote in ...

CSU LA, CS 420

Excerpt: ... Submitted by Shabana Hoque Based on lecture on 01/22/2007 RMI vs. CORBA Client HTTP, RMI, CORBA Application Server RMI, CORBA are like Remote Procedure Calls. The concept may be the same; one program calls another to execute some service, but RPCs function more like a program calling a function in the same machine, only done remotely. RPCs also tend to be language and platform specific. RMI stands for Remote Method Invocation , is an object-oriented implementation of the Remote procedure Call model. It is an API for Java programs only. RMI allows developers to invoke object methods and execute them on remote java virtual machines (JVMs). Under RMI entire objects can be passed and returned as parameters. RMI also supports a registry, which allows clients to perform lookups for a particular service. The object provides remote methods, which can be invoked in client programs. Remote object must be written in java. Remote object are accessed through their interfaces only. CORBA stands for Common Object Request ...

University of Illinois, Urbana Champaign, CS 425

Excerpt: ... N45 File bad.mp3 with key K42 stored here Lecture 14-13 Bank Database Example How are transactions executed between a client ATM and a bank server? Bank Database: Think of two simultaneous deposits of $10,000 into your bank account, each from one ATM. Both ATMs read initial amount of $1000 concurrently from the bank server Both ATMs add $10,000 to this amount (locally at the ATM) Both write the final amount to the server Whats wrong? The ATMs need mutually exclusive access to your account entry at the server 2002, M. T. Harandi and J. Hou (Modified K. Nahrstedt) Lecture 14-14 Middleware Layers Applications RPCs and RMIs, e.g., CORBA Request reply protocol External data representation Operating System Middleware layers= Provide support to the application RMI= Remote Method Invocation CORBA=Common Object Request Brokerage Architecture 2002, M. T. Harandi and J. Hou (Modified K. Nahrstedt) Lecture 14-15 Local Objects Object consists of a set of data and a ...

Toledo, EECS 4980

Excerpt: ... Tentative Timetable EECS 4980: Java Spring 2003 Note: This schedule is subject to frequent change. The dates will certainly change as we go along in the term. It is only a rough estimate of the timing of topics in the course. Date Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Week 14 Week 15 May 5 Topic(s) Java Basics I/O Basics Events and GUIs Applets Threads Networking - Basics Remote Method Invocation Servlets and JSP Java Beans JDBC IDL/Corba TBD TBD Examination 5-7PM Flanigan Chap. 1, 2 Chap. 3 Chap. 10, 11 Chap. 15 Chap. 4 Chap. 5 Chap. 16 Chap. 18 Chap. 15 Chap. 17 Reilly Chap. 2 Chap. 4 Chap. 7 Chap. 5,6 Chap. 11 Chap. 10 Chap. 12 ...

CSU Fullerton, JAC 444

Excerpt: ... Timeline for JAC444 (Winter 2009) Instructor: Peter Liu email: peter.liu@senecac.on.ca office hours: http:/cs.senecac.on.ca/~pliu Week 1: Getting started with Java 2 JDK, Java API, bytecode, the basic structure of a Java class, object references, the lifetime of a Java object, parameter passing, static variables, wiki-based learning Week 2: Java arrays and Java strings, extraction of tokens, the ArrayList class, inheritance Week 3: Java packages, unit testing with JUnit and Ant Week 4: Exception Handling in Java, the wrapper classes, the Random class Week 5: GUI programming in Java, Java interfaces Week 6: GUI programming and Graphics in Java Week 7: Test #1, Java collections Study Week Week 8: Thread progrramming Week 9: Java input/output, object serialization Week 10: Socket-based network programming in Java Week 11: Remote method invocation (RMI) Week 12: Test #2, Java databse connectivity(JDBC) Week 13: Review Examination Week ...

Temple, CIS 307

Excerpt: ... Remote method invocation from Tanenbaum. 1. Compile all .java files 2. Start the registry On Unix:rmiregistry & On Windows:start rmiregistry 3. Create an instance of the remote object java RemoteDateImpl 4. Reference the remote object java RMIClient ...

CSU LA, CS 420

Excerpt: ... CS420 1/22/2006 CLASS NOTES by Uma Dharmapuri Brief Introduction to RMI and CORBA: The Java Remote Method Invocation (RMI) mechanism and the Common Object Request Broker Architecture (CORBA) are the two most important and widely used distributed object systems. Each system has its own features and shortcomings. Remote Method Invocation (RMI) Java RMI is a Java application-programming interface for performing the object equivalent of remote procedure calls. The original implementation depends on Java Virtual Machine (JVM) class representation mechanisms and it thus only supports making calls from one JVM to another. The protocol underlying this Java-only implementation is known as Java Remote Method Protocol (JRMP). In order to support code running in a non-JVM context, a CORBA version was later developed. Usage of the term RMI may denote solely the programming interface or may signify both the API and JRMP. Java Remote Method Invocation (Java RMI) enables the programmer to create distributed Java technolog ...

East Los Angeles College, CS 3052

Excerpt: ... ); long number(); }; 17 16-Feb-07 COMP30052 Lecture 5 18 Syntax of interface but commonly with extra information (e.g. in, out, inout) about reference parameters 16-Feb-07 COMP30052 Lecture 5 3 Remote Method Invocation (RMI) Java includes RMI in its API Marshalling is simpler: Java <=> Java It requires that objects sent as arguments or results be serializable, i.e. there is a standard external form for them. This allows arbitrarily complex structures (not possible with copy/restore parameters) 16-Feb-07 COMP30052 Lecture 5 19 Remote Object References A major difference between RMI and RPC is that there are, in RMI, references to remote objects! 16-Feb-07 COMP30052 Lecture 5 20 What are Remote Object References? They must be system-wide not reused for other objects Figure 4.13 Representation of a remote object reference 32 bits 32 bits 32 bits 32 bits If objects don't move (only references) they can identify the machine (e.g. by internet address) and process (by port number and t ...

Brookdale, CS 3171

Excerpt: ... OSI Layers, interfaces, and protocols in the OSI model. 2-1 TvS 2.2 7 Middleware Protocols 2-5 An adapted reference model for networked communication. TvS 2.6 8 Middleware A software layer that masks the heterogeneity of systems provides a convenient programming abstraction provides protocols for providing general-purpose services to more specific applications, eg. authentication protocols authorization protocols distributed commit protocols distributed locking protocols high-level communication protocols remote procedure calls (RPC) remote method invocation (RMI) 9 Middleware General structure of a distributed system as middleware. 1-22 TvS 1.24 10 Middleware and Openness 1.23 In an open middleware-based distributed system, the protocols used by each middleware layer should be the same, as well as the interfaces they offer to applications. TvS 1.25 11 Middleware programming models Remote Calls remote Procedure Calls (RPC) distributed obj ...