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The showPic.js file now contains five functions: addLoadEvent insertAfter preparePlaceholder prepareGallery showPic Both addLoadEvent and insertAfter are general-purpose functions that you can use in many situations. The preparePlaceholder function creates an image element and a paragraph element. The function then inserts these newly created elements into the node tree, immediately after the image gallery list. The prepareGallery function handles events. The function loops through all the links in the image gallery list. When one of these links is activated, the showPic function is called. The showPic swaps out the placeholder image for one of the images linked from the gallery list. To initiate the functionality, the two functions preparePlaceholder and prepareGallery are called using the addLoadEvent function: addLoadEvent(preparePlaceholder); addLoadEvent(prepareGallery); This is how the finished showPic.js file looks: function addLoadEvent(func) { var oldonload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else { window.onload = function() { oldonload(); func(); } } } function insertAfter(newElement,targetElement) { var parent = targetElement.parentNode; if (parent.lastChild == targetElement) { parent.appendChild(newElement);

Listing 9-6 shows the implementation of the workflow builder for Attempt workflows; this is the simplest definition for AttemptBuilder. Listing 9-6. Defining a Workflow Builder let let let let let succeed x = (fun () -> Some(x)) fail = (fun () -> None) runAttempt (a:Attempt<'a>) = a() bind p rest = match runAttempt p with None -> fail | Some r -> (rest r) delay f = (fun () -> runAttempt (f ()))

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One important lesson to be learned from the days of COM and MTS/COM+ is that it isn t wise to expose large numbers of classes and methods from a server. When a server exposes dozens or even hundreds of objects, the client must be aware of all of them in order to function. Having the client aware of every server-side object results in tight coupling and fragility. A change to the server typically changes the server s public API, breaking all clients often even those that aren t even using the object that was changed. One way to avoid this fragility is to add a layer of abstraction. Specifically, you can implement the server to have a single point of entry that exposes a limited number of methods. This keeps the server s API very clear and concise, minimizing the need for a server API change. The data portal will expose just the five methods listed in Table 4-2. Table 4-2. Methods Exposed by the Data Portal Server

type AttemptBuilder() = /// Wraps an ordinary value into an Attempt value. /// Used to de-sugar uses of 'return' inside computation expressions. member b.Return(x) = succeed x /// Composes two attempt values. If the first returns Some(x) then the result /// is the result of running rest(x). /// Used to de-sugar uses of 'let!' inside computation expressions. member b.Bind(p,rest) = bind p rest

Creates a new object, loading it with default values from the database Retrieves an existing object, first loading it with data from the database Inserts, updates, or deletes data in the database corresponding to an existing object Deletes data in the database corresponding to an existing object Executes a command object (subclass of CommandBase as described in 5) on the server

/// Delays the construction of an attempt until just before it is executed member b.Delay(f) = delay f /// Used to de-sugar uses of 'let' inside computation expressions. member b.Let(p,rest) : Attempt<'a> = rest p let attempt = new AttemptBuilder() The inferred types here are as follows: type AttemptBuilder = new : unit -> AttemptBuilder member Bind : Attempt<'a> * ('a -> Attempt<'b>) -> Attempt<'b> member Delay : (unit -> Attempt<'a>) -> Attempt<'a> member Let : 'a * ('a -> Attempt<'b>) -> Attempt<'b> member Return : 'a -> Attempt<'a> val attempt : AttemptBuilder F# implements workflows by de-sugaring computation expressions using a builder. For example, given the previous AttemptBuilder, the following workflow: attempt { let! n1 = failIfBig inp1 let! n2 = failIfBig inp2 let sum = n1 + n2 return sum };; de-sugars to this: attempt.Bind( failIfBig inp1,(fun n1 -> attempt.Bind(failIfBig inp2,(fun n2 -> attempt.Let(n1 + n2,(fun sum -> attempt.Return(sum))))))) One purpose of the F# workflow syntax is to make sure you don t have to write this sort of thing by hand. The de-sugaring of the workflow syntax is implemented by the F# compiler. Table 9-3 shows some of the typical signatures that a workflow builder needs to implement.

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