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// Get the response stream use reader = new StreamReader(response.GetResponseStream()) // Read the response stream (note: a synchronous read) return reader.ReadToEnd() } // Compute the links, synchronously let links = getLinks html // Report, synchronously do printfn "finished reading %s, got %d links" url (List.length links) // We're done return links } /// 'urlCollector' is a single agent that receives URLs as messages. It creates new /// asynchronous tasks that post messages back to this object. let urlCollector = MailboxProcessor.Start(fun self -> // This is the main state of the urlCollector let rec waitForUrl (visited : Set<string>) = async { // Check the limit if visited.Count < limit then // Wait for a URL... let! url = self.Receive() if not (visited.Contains(url)) then // Start off a new task for the new url. Each collects // links and posts them back to the urlCollector. do! Async.StartChild (async { let! links = collectLinks url for link in links do self.Post link }) |> Async.Ignore // Recurse into the waiting state return! waitForUrl(visited.Add(url)) } // This is the initial state. waitForUrl(Set.empty)) You can initiate a web crawl from a particular URL as follows: > urlCollector <-- "http://news.google.com";; finished reading http://news.google.com, got 191 links finished reading http://news.google.com/ output=rss, got 0 links finished reading http://www.ktvu.com/politics/13732578/detail.html, got 14 links finished reading http://www.washingtonpost.com/wp-dyn/content/art..., got 218 links finished reading http://www.newsobserver.com/politics/story/646..., got 56 links finished reading http://www.foxnews.com/story/0,2933,290307,0...l, got 22 links ...

Tip You can also set the current database in the prompt by using the \d option. For example, to set the prompt in the client connected to the experimental server, issue the command prompt DBXP:\d->. This sets the prompt to indicate you are connected to the experimental server and the current database (specified by the last use command) separated by a colon (e.g., DBXP:Test->).

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The key techniques shown in Listing 13-13 are as follows: The type RequestGate encapsulates the logic needed to ensure that you place a global limit on the number of active web requests occurring at any point in time. This is instantiated to the particular instance webRequestGate with limit 5. This uses a System.Threading.Semaphore object to coordinate access to this shared resource. Semaphores are discussed in more detail in the section Using SharedMemory Concurrency. The RequestGate type ensures that web requests sitting in the request queue don t block threads but rather wait asynchronously as callback items in the thread pool until a slot in the webRequestGate becomes available. The collectLinks function is a regular asynchronous computation. It first enters the RequestGate (that is, acquires one of the available entries in the Semaphore). After a response has been received, it reads off the HTML from the resulting reader, scrapes the HTML for links using regular expressions, and returns the generated set of links. The urlCollector is the only message-processing program. It s written using a MailboxProcessor. In its main state, it waits for a fresh URL and spawns a new asynchronous computation to call collectLinks once one is received. For each collected link, a new message is sent back to the urlCollector s mailbox. Finally, you recurse to the waiting state, having added the fresh URL to the overall set of URLs you ve traversed so far. The operator <-- is used as shorthand for posting a message to an agent. This is a recommended abbreviation in F# asynchronous programming.

The loading phase involves loading any view state (in case of a postback request) from the page request and loading it in into the server controls. When the view state is restored, the PreLoad event is triggered, followed by the Load event. This is where you normally put your page processing logic that runs on every page request. Following this event, loading the view state is executed again to catch any dynamically added controls (for instance, those created in the Load event handler). Then any control change events and postback events are handled, and finally the LoadComplete event is raised. The rendering phase starts with performing all data binding (which involves the DataBinding and DataBound events for each data-bound control), and then the PreRender event is triggered. Next, any asynchronous tasks (registered via RegisterAsyncTask) are fired off, and the PreRenderComplete event is called. Before the actual rendering takes place, the view state is saved back to the page (by default to the default hidden input field). Finally, the page s Render method is called that produces HTML by recursively invoking the same method on each server control. Before this HTML is passed to the client, the Unload event is triggered and every object involved in the page creation is disposed.

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