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Exception propagation is added for free: If an exception is raised during an asynchronous step, then the exception terminates the entire asynchronous computation and cleans up any resources declared using use, and the exception value is then handed to a continuation. Exceptions may also be caught and managed within the asynchronous workflow by using try/with/finally. Cancellation checking is added for free: The execution of an Async<'T> workflow automatically checks a cancellation flag at each asynchronous operation. Cancellation can be controlled through the use of cancellation tokens.

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Modifications to the schema_tables Array ST_SCHEMA_TABLE schema_tables[]= { .. {"ENGINES", engines_fields_info, create_schema_table, fill_schema_engines, make_old_format, 0, -1, -1, 0}, /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command */ {"DISKUSAGE", disk_usage_fields_info, create_schema_table, fill_disk_usage, make_old_format, 0, -1, -1, 0}, /* END CAB MODIFICATION */ {"EVENTS", events_fields_info, create_schema_table, fill_schema_events, make_old_format, 0, -1, -1, 0}, .. OK, we re on the home stretch All that is left is to implement the fill_disk_usage() function Scroll up from the schema_tables array5 and insert the implementation for the fill_disk_usage() function as shown in Listing 8-32 Listing 8-32 The fill_disk_usage Function Implementation /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds the code to call the new SHOW DISK_USAGE command.

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Responses can be a verbatim copy of a resource found on the web server (most often a static file such as an image, a style sheet, or a media file) or can be generated on the fly. In this section, we show how you can use F# to serve content directly. Listing 14-1 shows a simple web server written directly in F#. Listing 14-1. A Simple Web Server #light open open open open open open System.Net System.Net.Sockets System.IO System.Text.RegularExpressions Microsoft.FSharp.Text.Printf System.Text

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Resource lifetime management is fairly simple: You can protect resources across parts of an asynchronous computation by using use inside the workflow syntax. If you put aside the question of cancellation, values of type Async<'T> are effectively identical to the following type: type Async<'T> = Async of ('T -> unit) * (exn -> unit) -> unit Here, the functions are the success continuation and exception continuations, respectively. Each value of type Async<'T> should eventually call one of these two continuations. The async object is of type AsyncBuilder and supports the following methods, among others: type AsyncBuilder with member Return : 'T -> Async<'T> member Delay : (unit -> Async<'T>) -> Async<'T> member Using: 'T * ('T -> Async<'U>) -> Async<'U> when 'T :> System.IDisposable member Bind: Async<'T> * ('T -> Async<'U>) -> Async<'U> The full definition of Async<'T> values and the implementations of these methods for the async object are given in the F# library source code. As you saw in 9, builder objects such as async containing methods like those shown previously mean that you can use the syntax async { ... } as a way of building Async<'T> values. Table 13-2 shows the common constructs used in asynchronous workflow expressions. For example, the following asynchronous workflow async { let req = WebRequest.Create("http://moma.org/") let! resp = req.AsyncGetResponse() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let! html = reader.AsyncReadToEnd() html } is shorthand for the following code: async.Delay(fun () -> let req = WebRequest.Create("http://moma.org/") async.Bind(req.AsyncGetResponse(), (fun resp -> let stream = resp.GetResponseStream() let reader = new StreamReader(stream) async.Bind(reader.AsyncReadToEnd(), (fun html -> async.Return html))) As you saw in 9, the key to understanding the F# workflow syntax is always to understand the meaning of let!. In the case of async workflows, let! executes one asynchronous computation and

*/ int fill_disk_usage(THD *thd, TABLE_LIST *tables, COND *cond) { TABLE *table= tables->table; CHARSET_INFO *scs= system_charset_info; List<Item> field_list; List<char> dbs; char *db_name; char *path; MY_DIR *dirp;.

schedules the next computation for execution after the first asynchronous computation completes. This is syntactic sugar for the Bind operation on the async object. Table 13-2. Common Constructs Used in async { ... } Workflow Expressions

/// A table of MIME content types let mimeTypes = dict [".html", "text/html"; ".htm", "text/html"; ".txt", "text/plain"; ".gif", "image/gif"; ".jpg", "image/jpeg"; ".png", "image/png"] /// Compute a MIME type from a file extension let getMimeType(ext) = if mimeTypes.ContainsKey(ext) then mimeTypes.[ext] else "binary/octet" /// The pattern Regex1 uses a regular expression to match /// one element let (|Regex1|_|) (patt: string) (inp: string) = try Some(Regex.Match(inp, patt).Groups.Item(1).Captures.Item(0).Value) with _ -> None /// The root for the data we serve let root = @"c:\inetpub\wwwroot" /// Handle a TCP connection for an HTTP GET let handleClient(client: TcpClient) = use stream = client.GetStream() let out = new StreamWriter(stream) let inp = new StreamReader(stream) match inp.ReadLine() with

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