java gs1-128

java gs1-128

java gs1 128

java ean 128

java gs1 128

java ean 128,

java gs1-128,

java gs1-128,
java ean 128,
java barcode ean 128,
java gs1 128,
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java gs1-128,
java gs1-128,
java gs1 128,
java barcode ean 128,
java barcode ean 128,
java barcode ean 128,

java gs1-128,
java ean 128,
java gs1-128,
java gs1-128,
java barcode ean 128,
java gs1 128,
java barcode ean 128,
java ean 128,
java gs1 128,
java barcode ean 128,
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java barcode ean 128,
java gs1 128,
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java ean 128,
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java ean 128,
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java barcode ean 128,
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java gs1-128,
java gs1-128,
java gs1 128,
java ean 128,
java gs1-128,
java barcode ean 128,
java barcode ean 128,

For active replication, the standard strongly recommends the use of a gateway for accessing the active replica group This gateway plays the role of a relay for method calls it broadcasts the method calls to all replicas that have to execute them in the same order The basic building blocks in the infrastructure are the Replication Manager, the Fault Noti er, and the Fault Monitor The Replication Manager implements interfaces that provide operations for setting group properties, managing replicated groups by the application, as well as creating groups2 on demand, and handling failover The Fault Noti er interface contains methods for registering fault consumers, for announcing faults, as well as for creating event lters Fault consumers are those nodes in the application or the infrastructure that have to know about the occurrence of faults.

When you first learned the basics of object oriented programming, you were probably told to think of objects making requests of each other When you invoke a method on an object to which you have a handle, you are basically asking the other object, "Hey, could you do something for me " As you've seen so far in this book, making such requests is not so simple when you are designing a distributed application You have to worry about how you find the remote object, how you communicate with it, and how it will get the response back to you At this point, you've seen lots of alternatives for running an enterprise application You can build applications that use servlets, JSPs, or EJBs.

You can instead choose to create a distributed application written in Java on both the server and the client that uses RMI (or Jini on top of RMI) At the other end of the spectrum, you can create a language independent approach using CORBA The idea of Web services is one that goes back to your first experiences with object oriented programming If you want to invoke a method in a remote Web service, or just send it information that might elicit a response, you send it a request Often, you send this request in the form of a Simple Object Access Protocol (SOAP) message Although you'll learn the details of this type of message in this chapter, the most important characteristic is that it is an XML message and so is easily read by both people and machines.

If a response is required, it too can be sent in the form of a SOAP message By agreeing on the protocol, you free yourself from wondering what language the service you are using is written in Likewise, the service doesn't care about the language in which the client contacting it is written In this chapter, you'll begin by writing a simple Web service that just returns the String you send it This elementary application will enable you to explore several different ways of deploying your Web service You can also take a look at the actual message being sent from client to server and also the message being sent from server to client The examples in this chapter use the Apache open source application Axis to serve your Web services from inside Tomcat These are open source offerings that are available for free from the Apache Software Foundation.

An event lter is related to a fault consumer and is used to send a fault noti cation exactly to those parties that are interested in it To be able to manage large applications, the notion of fault tolerance domains is introduced Each fault tolerance domain contains several hosts and object groups and a separate pair of Replication Manager and Fault Noti er is associated with it On every host, there has to be one Object Factory and one Fault Monitor The Object Factory creates group replicas on demand The Fault Monitor has to detect failures of group members running on its host Every application object has to implement interfaces for failure detection and checkpointing Logging and recovery mechanisms, needed for passive stateful replication, are automatically used when infrastructure-controlled consistency and membership is chosen by the application.

When you create a Web service that you would like others to use, you need to get the word out somehow You can use a registry that uses a protocol called Universal Discover, Description, and Integration (UDDI) This process is generally known as publishing your Web service As a developer, you can also use the registry to find other Web services Once you've found these other services, you can look around for information that will enable you to connect to the service and use it In this chapter you'll see what's involved in these last two steps, commonly known as find and bind In the final section you'll look at serializing a JavaBean and sending it as part of the SOAP message..