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value class V : ValueType, IA { }; ref class B : IB, Base { };

Listing 5-3. Creating Quota Files [root@server ~]# quotacheck -cugv /home quotacheck: Scanning /dev/hda3 [/home] done quotacheck: Checked 11 directories and 12 files The quota files will be stored as aquota.user and aquota.group in the filesystem. Users should be able to read these files so that they can check their quotas themselves by running the quota command. To make these files readable, just issue the commands chmod o+r aquota.user and chmod o+r aquota.group.

// OK. Base class need not appear first (as in C#).

The next step is setting up quota settings for each user. To edit the quota of a user, we use the edquota utility. Simply issue the command edquota <username> to edit the quota of a particular user. Doing so will enable you to view and edit the quota file of user in vi mode, as shown in Listing 5-4. Listing 5-4. Quota File of a User Disk quotas for user chivas (uid 500): Filesystem blocks soft hard inodes /dev/hda3 72 0 0 soft 9 hard 0 0

Figure 8-8. Creating a new BizTalk application 3. Name your application chapter8, and then click OK. 4. Expand the chapter8 directory. 5. Right-click Receive Ports and select New One-Way Receive Port, as shown in Figure 8-9.

The first column specifies the filesystem where quota is enabled. The second column specifies the number of blocks, in kilobytes, that have already been used by the user. The third and fourth columns specify the soft and hard limits for disk usage in kilobytes. Zero values denote no limitation. When the soft limit is exceeded, the system will warn the user, but disk consumption will still be allowed until it reaches the hard limit, or grace period. The grace period can be set in any combination of seconds, minutes, hours, days, weeks, and months. The fifth column specifies the number of inodes that have already been used. Each file is represented with a unique inode, therefore, this column also represents the number of files the user had in this filesystem. The sixth and seventh columns represent soft and hard limits of inodes this user can use. Again, zero values denote no limitations. For example, if you want this user to have a soft limit of 10 MB of disk usage, a hard limit of 15 MB of disk usage, a soft limit of 100 inodes, and a hard limit of 120 inodes, you would change the settings as shown in Listing 5-5. Listing 5-5. Sample Quota Management for a User Disk quotas for user chivas (uid 500): Filesystem blocks soft /dev/hda3 72 10000 15000 hard 9 inodes 100 soft 120 hard

An interface declaration may itself call for the implementation of other interfaces. When this construct is used, it means that the class implementing the interface must implement all the methods declared in the interface body, as well as any methods declared in interfaces added to the base class list. Listing 9-4 illustrates this pattern.

Tip: If the quota settings will be consistent across users, you may copy the quota settings of one user and apply them to other users by issuing the command edquota up <source_user> <user1> <user2> <user..> <usern>.

Listing 9-4. Interface Inheritance // interfaces_implementing_interfaces.cpp interface class IA { void f(); }; interface class IB : IA { void g(); }; ref class R : IB { public: virtual void f() {} virtual void g() {} }; When interfaces inherit from other interfaces, the new and override specifiers are not used on the method declarations. These specifiers are only applicable to class inheritance. In fact, an interesting case is the one of a class that inherits a method from a base class and also implements a method with the same name from an interface. In that case, new would indicate that the method is different from the base class method (see Listing 9-5). Listing 9-5. Using new to Implement an Interface Method // base_and_interface.cpp using namespace System; ref class B { public: virtual void f() { Console::WriteLine("B::f"); } virtual void g() { Console::WriteLine("B::g"); } }; interface class I { void f(); void g(); }; ref class C : B, I { public:

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