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As you can see in Figure 8-1, you have a receive port and a receive location. So what exactly is the difference A port is a logical container for the physical receive location. Imagine that you re sailing to Paradise Island on your brand-new boat, for a welldeserved vacation. You re going to be pulling into Paradise Island International Port and docking at Pier 13. The international port of arrival is your receive port, and the pier is a receive location. Is it possible that your port could be made up of many piers Yes, it s highly probable that there are multiple locations for other vacationers to dock their boats. And such is the case with BizTalk ports. Ultimately, this becomes excruciatingly important when you design and implement your routing structure. A port is essentially a container of locations where you can obtain data. A receive port could be made up of as many locations as you want limited by your system resources, of course.

Since a value type is also sealed (as discussed in the next section), such a class would be abstract and sealed It would not be possible to create an instance of such a type, and although you could call static methods on it, you would have to provide an implementation of these methods There are many ways in which abstract classes are different from interfaces Abstract classes can inherit from nonabstract classes Instance functions (including properties) and instance fields may be defined, not just declared, in abstract classes None of that is possible in an interface class This difference has big implications for the choice between abstract classes and interfaces when designing a library, especially a library that you intend to update with a new version Abstract classes are more easily changed in subsequent versions.

Traditionally on the Intel x86 platform, hard disks have only been able to support four primary partitions. It was possible to increase this number using extended partitions and logical partitions, but though workable, this solution wasn t the most elegant. Unfortunately, you simply couldn t fix the problem, as it would require a fundamental change to the platform, which would break compatibility. For the most part, people just lived with it and with tools available to handle the low level details, it wasn t too much of a problem.

Unfortunately, having a limited number of fixed partitions started to become a real nightmare as disk size and usage increased. For example, traditionally users files would be stored on a separate partition mounted on /home. Now, if that partition was 20GB and was starting to get full, we would have to find some space. The problem is that this space will come in the form of another partition, and that s just not very useful. There s no way for us to simply increase the size of /home. Instead, we have to mess about splitting home directories across these two partitions. Apart from the obvious nuisance of having to manage two separate disks, we also need to be aware of how we share the space. For example, it might seem perfectly logical if we decided to put all users whose names begin with A to M on the first partition and then N to Z on the second partition. But what if there are more users in one half than the other Worse, what if there are only a handful of users that use a large amount of disk space, and they all coincidentally end up on the same disk These issues are the key problems that LVM was designed to solve. The main features that LVM provides over traditional partitioning schemes are online resizing of partitions and the ability to add and remove disks as well as create partitions on the fly. If this sounds pretty neat, that s because it is! LVM is one of those technologies that, once you start using it, you ll wonder how you managed to get by without it.

If you add a method to an interface, all the classes that implement that interface must implement the new method If you add a method to an abstract class, you can provide an implementation in the class You just add a nonabstract method to the abstract class..

Note: During the install process, CentOS will, by default, set up the disk using LVM. The installer will create a small boot partition (it s not currently possible to boot from an LVM device) and will assign the rest of the space to LVM to create the other partitions that CentOS needs. We will look at this process in more depth later in the chapter.

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