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cc file can correctly route the execution to the implementation of the SHOW DISK_USAGE command Notice also that I placed this code at the start of the show: definition and used the vertical bar symbol (|) in front of the previous SHOW syntax statement The vertical bar is used as an or for the syntax switch Thus, the statement is valid if and only if it meets one of the syntax statement definitions Feel free to look around in this file and get a feel for how the code works Don t sweat over learning every nuance What I have shown you is the minimum of what you need to know to create a new command If you decide to implement more complex commands, study the examples of similar commands to see how they handle tokens and variables.

async { // Check the limit if visited.Count < limit then // Wait for a URL... let! url = self.Receive() if not (visited.Contains(url)) then // Spawn off a new task for the new url. Each collects // links and posts them back to the urlCollector. do! Async.SpawnChild (async { let! links = collectLinks url for link in links do do self <-- link }) // Recurse into the waiting state return! waitForUrl(visited.Add(url)) } // This is the initial state. waitForUrl(Set.empty)) We 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 ... The key techniques shown in Listing 13-13 are as follows: The type RequestGate encapsulates the logic needed to ensure that we place a global limit on the number of active web requests occurring at any one 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 Shared-Memory Concurrency. The RequestGate type ensures that web requests sitting in the request queue do not 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). Once 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.

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Some of the foundational data structures of F# coding are tuples, lists, and options. The following sections discuss these and some related topics by example.

Next, you need to add the source code to the large command statement switch in sql_parsecc Open the file and add a new case to the switch statement as shown in Listing 8-21 Listing 8-21 Adding a Case for the New Command .. case SQLCOM_SHOW_AUTHORS: res= mysqld_show_authors(thd); break; /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command */ case SQLCOM_SHOW_DISK_USAGE: res = show_disk_usage_command(thd); break; /* END CAB MODIFICATION */.

The urlCollector is the only message-processing program. It is 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, we recurse to the waiting state, having added the fresh URL to the overall set of URLs we have 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 AcquireAsync method of the RequestGate type uses a design pattern called a holder. The object returned by this method is an IDisposable object that represents the acquisition of a resource. This holder object is bound using use, and this ensures the resource is released when the computation completes or when the computation ends with an exception. Listing 13-13 shows that it is relatively easy to create sophisticated, scalable asynchronous programs using a mix of message passing and asynchronous I/O techniques. Modern web crawlers have thousands of outstanding open connections, indicating the importance of using asynchronous techniques in modern scalable web-based programming.

F# lists are a common data structure used in functional programming. You saw some examples of concrete lists in 2. Table 3-8 shows the primitive constructs for building lists. Table 3-8. Some List-Related Language Constructs and Operators

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