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lthough most of your interactions with Django s template language will be in the role of template author, you may want to customize and extend the template engine either to make it do something it doesn t already do, or to make your job easier in some other way. This chapter delves deep into the guts of Django s template system. It covers what you need to know if you plan to extend the system or if you re just curious about how it works. If you re looking to use the Django template system as part of another application (i.e., without the rest of the framework), make sure to read the Configuring the Template System in Standalone Mode section later in the chapter.

We don t need to know the private details of how object references are stored internally to a specific type of collection in order to use the collection properly; we only need to know a collection s public features in particular, its public method headers in order to choose an appropriate collection type for a particular situation and to use it effectively. Virtually all collections, regardless of type and regardless of the programming language in which they are implemented, provide, at a minimum, methods for Adding objects Removing objects Retrieving specific individual objects Iterating through the objects in some predetermined order Getting a count of the number of objects presently referenced by the collection Answering a true/false question as to whether a particular object s reference is in the collection or not

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The Oracle RDBMS does not lock any data for retrieval. This means that readers never block readers. Moreover, this also means that writers never need to wait for readers, and vice versa.

Throughout this chapter, we ll talk casually about manipulating objects in collections, but please remember that, with Java, what we really mean is that we re manipulating object references.

First, let s quickly review a number of terms introduced in 4: A template is a text document, or a normal Python string, that is marked up using the Django template language. A template can contain block tags and variables. A block tag is a symbol within a template that does something. This definition is deliberately vague. For example, a block tag can produce content, serve as a control structure (an if statement or for loop), grab content from a database, or enable access to other template tags. Block tags are surrounded by {% and %}: {% if is_logged_in %} Thanks for logging in! {% else %} Please log in. {% endif %} A variable is a symbol within a template that outputs a value. Variable tags are surrounded by {{ and }}: My first name is {{ first_name }}. My last name is {{ last_name }}.

Note The Oracle RDBMS s handling of data locking does not mean that readers and writers do not hinder each other in any way. Readers and writers can cause delays for each other by contending for certain system resources, such as CPU.

// Constructor. public Student(String n) { setName(n); setMajor("TBD"); // default value // etc. // This would be a problem - we'd be resetting // the value of totalStudents to 0 with each // new Student object that we create. nextAvailableStudentIdNo = 10000; setStudentIDNo(nextAvailableStudentIdNo++); // etc. } // etc. } It s possible to define initialization code that will get performed only once in a given application invocation specifically, when the class s bytecode of which it is a part is first loaded into the JVM by enclosing it in what is known as a static code block, thus creating a static initializer. The general syntax for doing so is as follows: public class Student { private String name; private String major; private int studentIDNo; private static int nextAvailableStudentIDNo; // etc. // A static initializer. static { // Whatever code is enclosed within this block // will be executed once, when the enclosing // class (Student, in this case) is loaded into // the JVM's memory. nextAvailableStudentIDNo = 10000; } // Constructor. public Student(String n) { setName(n); setMajor("TBD"); // default value // etc. setStudentIDNo(nextAvailableStudentIdNo++); // etc. } // etc. }

We can, of course, do anything that makes good sense within a static initializer; in addition to initializing static variables, we can establish resources for an application, such as a file or database connection, that need only be performed once per application session. We ll use this technique in 15 in building the SRS.

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