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Have you ever needed to share processing between two or more computers running programs written in different languages on different operating systems? Or have you ever wanted to publish information on the Web so that programs other than browsers could work with it? XML-RPC, a system for remote procedure calls built on XML and the ubiquitous HTTP protocol, is the solution you've been looking for.Programming Web Services with XML-RPC introduces the simple but powerful capabilities of XML-RPC, which lets you connect...
Have you ever needed to share processing between two or more computers running programs written in different languages on different operating systems? Or have you ever wanted to publish information on the Web so that programs other than browsers could work with it? XML-RPC, a system for remote procedure calls built on XML and the ubiquitous HTTP protocol, is the solution you've been looking for.Programming Web Services with XML-RPC introduces the simple but powerful capabilities of XML-RPC, which lets you connect programs running on different computers with a minimum of fuss, by wrapping procedure calls in XML and establishing simple pathways for calling functions. With XML-RPC, Java programs can talk to Perl scripts, which can talk to Python programs, ASP applications, and so on. You can provide access to procedure calls without having to worry about the system on the other end, so it's easy to create services that are available on the Web.XML-RPC isn't the only solution for web services; the Simple Object Access Protocol (SOAP) is another much-hyped protocol for implementing web services. While XML-RPC provides fewer capabilities than SOAP, it also has far fewer interoperability problems and its capabilities and limitations are much better understood. XML-RPC is also stable, with over 30 implementations on a wide variety of platforms, so you can start doing real work with it immediately.Programming Web Services with XML-RPC covers the details of five XML-RPC implementations, so you can get started developing distributed applications in Java, Perl, Python, ASP, or PHP. The chapters on these implementations contain code examples that you can use as the basis for your own work. This book also provides in-depth coverage of the XML-RPC specification, which is helpful for low-level debugging of XML-RPC clients and servers. And if you want to build your own XML-RPC implementation for another environment, the detailed explanations in this book will serve as a foundation for that work.
You already have a wide variety of Java-based XML and HTTP tools to choose from, but you can also take advantage of a prepackaged set of XML-RPC tools. Although understanding the foundations of XML-RPC is very useful for debugging and for establishing connections between systems in different environments, you can treat XML-RPC much like you do any other Java feature. There's some setup work to do, especially for XML-RPC servers, but most of this work is simple and needs to be done only once in the course of a program.
This chapter looks at how XML-RPC fits into Java's many network options. It demonstrates how to build a variety of different XML-RPC clients, servers, and handlers. Some of these examples take advantage of built-in functionality for setting up simple XML-RPC servers and handlers; others explore the possibilities opened up by handling more of the processing directly. The examples cover different styles of XML-RPC programming, from simple library function calls to more complex calls that manipulate information on the server.
Despite Java's built-in network computing prowess, XML-RPC offers a few kinds of functionality that Java can't match. XML-RPC is far more lightweight than Java's built in RMI support, passing only parameters rather than objects. Java programs can use XML-RPC to connect directly to any other system supporting XML-RPC, rather than limiting connections to fellow RMI systems or having to use complex (and expensive) CORBA object request brokers.
As illustrated in Figure 3-1, XML-RPC can bring the direct connections RMI makes possible for strictly Java applications to applications that integrate multiple environmentsXML-RPC's use of HTTP as a transport substrate makes it relatively simple to integrate XML-RPC with the web-enabled applications that are already spreading across the computing landscape. At the same time, XML-RPC uses such a tiny subset of HTTP that Java applications can easily avoid the overhead of full-scale HTTP processing, working with a more minimal--and more efficient--driver that takes advantage of Java's built-in understanding of TCP/IP.
XML-RPC also offers you a shorter compilation and testing cycle. Unlike RMI, which requires recompilation of interfaces to register method signatures, XML-RPC allows the client to specify which method it wants to use and then looks for a handler. Because the reference is done by name, there aren't any stubs to manage or include, and changes can be made much more easily at runtime.
On the other hand, XML-RPC is definitely not appropriate in plenty of Java application situations. Much of the Enterprise JavaBeans (EJB) work already relies on RMI, and rewriting it to use XML-RPC would be a remarkable waste of time. Although a snippet of XML-RPC code might be useful as a simple bridge between an EJB-based application and code written for other environments, XML-RPC isn't designed explicitly to support the many demands of complex enterprise-scale design. Similarly, if you need to pass objects, rather than parameters, betweensystems, you should look into a more sophisticated set of tools than XML-RPC. XML-RPC lets you pass sets of parameters, not complex nested structures with associated method information, back and forth. As explained later in this chapter, XML-RPC's approach doesn't match cleanly with JavaBeans, either.
Figure 3-1. XML-RPC makes it possible to connect a wide array of programming environments...
...Although most Java programs aren't designed for use in the procedural framework that XML-RPC uses, an enormous amount of code in the typical Java program could conceivably be exposed as an XML-RPC procedure, with or without some degree of modification. Although Java is very object-focused, it retains enough links with procedural environments for developers to take advantage of "traditional" features, such as function calls, in the midst of complex object interactions. Although some of XML-RPC's rules, like its lack of support for void return values, make integrating XML-RPC with Java difficult, most of the integration process is pretty simple, limited only by the narrow range of data types and structures XML-RPC supports.
The XML-RPC library for Java does not require the methods it uses be static, but in some ways static methods fit the basic architecture of XML-RPC very well. Static methods are the closest things Java offers to procedural function calls, commonly used for utility functions (such as those in the Math class) for which the function itself is important, but there may not be any surrounding context. If you've built libraries of these kinds of methods, implementing key algorithms for processing arguments, you may find it especially easy to convert your old work to XML-RPC handlers.
You can also use XML-RPC servers in a larger Java framework to answer client requests while using those requests to modify their own information set. Rather than thinking about XML-RPC handlers as "mere" procedures, you can treat XML-RPC handlers as regular Java methods, limited only by difficulties in transferring objects between the routine making the method call and the routine performing processing. In every other way, XML-RPC can become a natural part of Java programming, providing yet another way to get information into and out of Java environments. Using XML-RPC can make connecting Java programs to programs written in other environments much simpler, and may be appropriate for some simple Java-to-Java cases, as well.
As of this writing, the XML-RPC library for Java in still in beta, at Version 1.0 beta 4. Although it is unlikely that there will be major changes to the API, you should check the index.html file and documentation that come with the library if you encounter problems.
The XML-RPC Library for Java web site is
http://classic.helma.at/hannes/xmlrpc/, and additional resources (including a mailing list with archives) are also available there. The examples in the current chapter use the helma.xmlrpc library, which is available at that site....
Chapter 1: Introduction
Chapter 2: The XML-RPC Protocol
Chapter 3: Client-Server Communication: XML-RPC in Java
Chapter 4: XML-RPC and Perl
Chapter 5: Integrating Web Applications: XML-RPC in PHP
Chapter 6: XML-RPC and Python
Chapter 7: Bridging XML-RPC and COM: XML-RPC in ASP
Chapter 8: XML-RPC and the Web Services Landscape
The XML You Need for XML-RPC
The HTTP You Need for XML-RPC
Posted March 5, 2014
Posted March 5, 2014
Posted March 5, 2014
Posted March 5, 2014
((Nuu the last few chapters! These last few chapters is gonn be Edd from his POV)) I quickly yet quietly closed the door to my house. Swooning over Claire, I went to my room and layed in the same spot I was before. I decided to text Claire. 'Miss ya! ;)' Then, hit send. I got a quick reply. 'Same. Just wondering, are we official?' I thought about it. We did kiss and confess our love for each other. 'I think so.' I texted back. 'Good. Cause after all that from last night and NOT saying we are official would be crazy! Amanda is begging me to walk her to Tom's. Love ya!' I smiled. 'Bye, love ya 2.' I typed. 'Maybe we can hangout later?' I texted. For a while I didn't get a text. 'Sure! At your house.' The doorbell rang and I smiled, racing downstairs. I swung open the door and quickly hugged Claire. I picked her up by the waist from behind and swung her around. She laughed and I let go. "Ready?" I asked. She nodded and we were on our way. "So, what first?" "Candy shop!" She pointed at the local candy shop and I smiled. "Let's go!" She raced to it and I followed. She gazed at all the candy. But one caught her eye. "Gummy bears." She drooled. "Wanna get some?" She nodded like a child and i grabbed a bag and poured some in. I gave it to her and she looked around. "I'm done here." She stated and handed the cashier the gummy bears. I noticed he was glancing up at Claire from time to time. He was a bit nerdy, acne, big thick rimmed glasses, and head gear. I pulled her closer and wrapped an arm around her waist. She didn't pay attention and gazed around our little town. Once he handed us our gummy bears, she tore open the bag. "Thank you!" "Call me?" He asked. She walked off. "Listen, she's in a relationship with me. Back off." I said. He snorted and helped snotty kids. Claire ate the gummy bears and walked around. "He wasn't my type." She said. I smiled and held her hand. "Frozen!" She said, pointing at a movie poster. "I have money." She dragged me inside after I said that. "Two adult tickets to see Frozen." I said. The woman handed us our tickets and we bought popcorn. As we sat down, the movie started. It was actually quite interesting. Claire seemed so into Elsa and Anna. They're bond as sisters. After the movie, we walked home. "Let it go, Let it go." Claire sung quietly. I smiled and spun her around. "Can't hold it back anymore." I sang back to her. We laughed and sung as rain soon greeted us. We laughed more. I stopped laughing to admire Claire. The rain made her blonde hair seem brunette and her eyes looked more green than hazel. "Claire." I said. She stopped and faced me. Being inches apart, I couldn't resist but lean in and kiss her. Not too rough, not too soft. In the middle. I kissed her lips with passion yet with gentleness. As we pulled away, we stayed close to each other. "I fell in love with you like I fall asleep. One bit at a time, then all at once." She whispered. ((If you know what thats from leave a comment saying where!)) I smiled and held her hands. The rain kept pelting us, getting us drenched. We didn't care. "I could hug you all day. In the rain, snow, hail, any weather. I'll protect you." I said, scopping her up bridal style. She blushed and snuggled close. I walked to her house and knocked. Matt opened up and glanced at Claire. He smirked and let me in. I walked up to the guest room and layed her on the bed. She yawned. "Out. I gotta change." She said, shoving me out. I smiled. ((Wrap!))Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.