ASP.NET Web PDF Document Viewer/Editor Control Library

(Equally clearly, such a method could be defined; I mean, I think the example is legitimate) Next (to quote again): The subtype must provide all methods of its supertype;17 we refer to these as the inherited methods Comment: Another model vs implementation confusion! (and another consequence of trying to formalize preexisting notions ) I mean, the statement doesn t seem to need saying, unless there might otherwise have been some possibility that it wasn t true Let me elaborate:.

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The last section claimed data services to be a Java web application. You will see that claim reinforced by deploying a data service like any other Java web application in a Java application server (with a servlet container). Once we have deployed it successfully, we will go ahead and configure it so that we are ready to build an example application.

16. In other words, I agree with Robert Martin s remark or, at least, the general sense of his remark to the effect that inheritance is the ISA relationship (see earlier). Of course, Martin himself made that remark only in order to go on to refute it, but I reject his refutation! 17. Note the tacit assumption that a given subtype has just one supertype (more precisely, just one immediate supertype see The Third Manifesto). Liskov and Wing do say they allow multiple supertypes, but there s no serious discussion of the possibility of multiple inheritance in their paper. In The Third Manifesto, by contrast, we show that multiple inheritance is not only desirable, it s logically required (i.e., single inheritance by itself makes little sense) and we go on to examine the implications of this fact in considerable detail.

Figure 6-12. Free rotation is accomplished by dragging out the rotation handle to the length you require.

For the purposes of illustration, we will pick BlazeDS as the data service and choose JBoss Application Server (AS) as the Java application server. If the data service is LCDS and the application server is any other, such as Apache Tomcat, BEA WebLogic, IBM WebSphere, Apache Geronimo, Caucho Resin, or GlassFish, the situation is not very different. Each of these application servers has its own directory structure and styles of deployment. Deploying BlazeDS or LCDS involves the same level of complexity as deploying any other Java web application packaged as a WAR. Adobe Labs has published some notes on the specific installation instructions for a few of the popular application servers. These notes are online at http://opensource.adobe.com/wiki/display/blazeds/BlazeDS+3+Release+Notes. The first step is to get all the required software and to install it.

Throughout our database work in general, Hugh Darwen and I have always tried very hard to follow certain guiding principles (and, of course, this remark is true of our work on the Manifesto in particular). Of those principles, the most important indeed, it underpins all the rest is this: All logical differences are big differences.

license. Go to http://opensource.adobe.com/wiki/display/blazeds/BlazeDS and download the latest stable release build. You will have a choice to download the binary or the source versions. The binary version is what you should choose unless you intend to make modifications to the code. The distribution is available as a ZIP file. When you unzip the archive file, you will find a file called blazeds.war. This is the WAR file that has everything in it needed to use BlazeDS. In addition, you may find the following files:

At UC Berkeley, two students named Spencer Kimball and Peter Mattis wrote a Free Software desktop graphics application, which they released under the name General Image Manipulation Program ( the GIMP ). By 1997, it had been adopted by the GNU project and renamed the GNU Image Manipulation Program. Early GIMP user Larry Ewing designed a mascot for the Linux kernel project: a cartoon penguin named Tux (Figure 1-5). (That s how GNU/Linux came to be associated with penguins.)

This dictum is due to Ludwig Wittgenstein1 What does it mean Well, the subject matter of the Manifesto is, essentially, the relational model And the relational model is at heart a formal system: just as a DBMS is, or an operating system, or indeed any computer program, come to that Formal systems are what computers are (or can be made to be) good at And, of course, the basis of any formal system is logic It follows that with respect to formal systems in general, and hence with respect to programming in general, and with respect to database management and the relational model in particular differences that are logical in nature are very important ones, and we need to pay very careful attention to them To put it another way: Computers are very precise in their operation they don t have much tolerance for error.

blazeds-samples.war: A set of sample applications blazeds-console.war: Monitoring application for BlazeDS deployments