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Because we use the StartNew method to create those tasks, the tasks will start running after they are created task4 depends on task1 When we create task4, we use the static TaskFactoryContinueWhenAll method The first parameter to the ContinueWhenAll method is an array of tasks that task4 depends on The second parameter is the delegate that represents the actions we want task4 to perform Because we use the ContinueWhenAll method to create task4, task4 won t start executing until task1 is done Similarly, task5 depends on task2; task6 on task4; task 7 on task2, task4 and task5; and finally task8 on task3 and task5 Every time you run the code in Listing 9-15, you will likely see task 1 , task 2 , task 3 , and so on printed on the screen in different order.

When a node of your node type is submitted, your module will be called via hook_validate(). Thus, when the user submits the form to create or edit a job post, the invocation of hook_validate() will look for the function job_post_validate() so that you can validate the input in your custom field(s). You can make changes to the data after submission see form_set_value(). Errors should be set with form_set_error(), as follows: /** * Implements hook_validate(). */ function job_post_validate($node) { // Enforce a minimum character count of 2 on company names. if (isset($node->job_post_company) && strlen($node->job_post_company['und'][0]['value']) < 2) { form_set_error('job_post_company', t('The company name is too short. It must be atleast 2 characters.'), $limit_validation_errors = NULL); } } Notice that you already defined a minimum word count for the body field in hook_node_info(), and Drupal will validate that for you automatically. However, the punchline field is an extra field you added to the node type form, so you are responsible for validating (and loading and saving) it.

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NOTE Systems that participate in a TCP/IP network are known as hosts. This applies to NAS storage devices, workstations, printers, and any other device that requires an IP address.

Saving Our Data with hook_insert()

One thing you can count on is that task 4 will never be printed before task 1 because task4 won t start to run until task1 is done Listing 9-15 Tasks That Have Dependencies among Them private static { Task task1 Task task2 Task task3 void RunTaskDependencyExample() = TaskFactoryStartNew(() => { ConsoleWriteLine("task 1"); }); = TaskFactoryStartNew(() => { ConsoleWriteLine("task 2"); }); = TaskFactoryStartNew(() => { ConsoleWriteLine("task 3"); }); TaskFactoryContinueWhenAll(new[] {task1}, { ConsoleWriteLine("task 4"); }); TaskFactoryContinueWhenAll(new[] { task2 }, { ConsoleWriteLine("task 5"); });.

When a new node is saved, hook_insert() is called. This is the place to handle any custom processing of the node s content before the node is saved. This hook is called only for the module that is defined in the node type metadata. This information is defined in the base key of hook_node_info() (see the Providing Information About Our Node Type section). For example, if the base key is job_post, then job_post_insert() is called. If you enabled the book module and created a new node of type book, job_post_insert() would not be called; book_insert() would be called instead because book.module defines its node type with a base key of book.

An old analogy (but a good one) likens an IP address to a street address. The street address uniquely identifies the house, allowing mail to (mostly) be delivered from anywhere in the world. The same follows suit on a network: every system must be uniquely identifiable from every other; otherwise, data wouldn t get to where it s supposed to go. The conventions for formatting host addresses must be followed closely, especially if the host system will be connecting to the Internet. In most cases when you connect to the Internet, your ISP will allocate your IP address. ISPs maintain large pools of IP addresses and subsequently allocate these to their clients on connection.

Note If you need to do something with a node of a different type when it s inserted, use a node hook to hook into the general node submittal process. See the Manipulating Nodes That Are Not Our Type with hook_node_insert() section.

NOTE IP addresses assigned by an ISP can change each time you connect. This is because they are allocated from the pool held by the ISP. When your connection terminates, you lose your address, and someone else may end up using it. The next time you connect, you get the next available address from the pool.

Task task6 = tasks => Task task7 = tasks => Task task8 = tasks => }

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