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There are three basic permissions for operations on nodes: view, update, and delete. When one of these operations is about to take place, the module providing the node type gets first say with its hook_access() implementation. If that module doesn t take a position on whether the access is allowed (that is, it returns NULL instead of TRUE or FALSE), Drupal asks all modules that are interested in node access to respond to the question of whether the operation ought to be allowed. They do this by responding to hook_node_grants() with a list of grant IDs for each realm for the current user.

If the input expression parameter of the Execute method does represent a call to the Where<T> method of the Queryable class, we use an expression visitor to visit the MethodCallExpression and its descendant expressions The expression visitor is an instance of QueryExpressionVisitor<T>, whose code is shown Listing 8-16 The expression visitor s job is to retrieve the lambda function that makes up the where clause of our query In our query, that lambda function is c => cFirstNameEquals(firstName) and it is stored as a descendant expression under the MethodCallExpression Once the visitor retrieves the expression representing the lambda function, in line 39 of Listing 8-15 we get that expression from the visitor s Predicate property and use the expression to find matching objects in the class member variable records Because the LINQ component of the .

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When you surf the Web, you tend to type the universal resource locator (URL) for the address of the system, the first part of which is the DNS name of the server you are trying to contact. Domain names consist of two or more parts separated by dots, with the piece on the left being the most specific, and the piece on the right being the most general for example, Microsoft.com. Because IP addresses are numbers but humans work better with real names, some method was required to translate the numerical IP address into a more easily recognizable name the domain name.

A realm is an arbitrary string that allows multiple node access modules to share the node_access table. For example, acl.module is a contributed module that manages node access via access control lists (ACLs). Its realm is acl. Another contributed module is taxonomy_access.module, which restricts access to nodes based on taxonomy terms. It uses the term_access realm. So, the realm is something that identifies your module s space in the node_access table; it s like a namespace. When your module is asked to return grant IDs, you ll do so for the realm your module defines.

A grant ID is an identifier that provides information about node access permissions for a given realm For example, a node access module such as forum_accessmodule, which manages access to nodes of type forum by user role may use role IDs as grant IDs A node access module that manages access to nodes by US zip code could use zip codes as grant IDs.

The sole purpose of DNS is to turn readable names into IP addresses so network systems can contact each other using the correct address. The deluge of computers that flood the Internet use a distributed database of domain names that maps all names to corresponding IP addresses. This database is available to all computers and users of the Internet, allowing your local business systems to perform DNS lookups anytime they need.

NET Framework comes with a LINQ query provider called LINQ to Objects for executing LINQ queries against IEnumerable<T> collections such as the class member variable records, line 39 simply uses the LINQ to Objects query provider to find the matching objects This might strike you as a little absurd because we could have used the LINQ to Objects query provider directly without building a custom query provider that uses the LINQ to Objects provider internally That s true, except that if we had used the LINQ to Objects query provider directly, I wouldn t be able to use our custom query provider as a typical example of how DLR Expression is used as a metaprogramming technique Besides, you can think of this use of the LINQ to Objects provider as simplification of a more practical case where we would have more complex logic for querying the data store.

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