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Dealing with exceptions is part of any program, but software that makes use of external services (such as HTTP services) must pay additional attention to exceptions because the potential for errors is magnified There are several types of exceptions that you can expect while making use of HTTP services These include transport exceptions, protocol exceptions, and timeouts You should understand when these exceptions could occur Transport exceptions can occur due to a number of reasons, but the most likely scenario (with a mobile device) is poor network connectivity Protocol exceptions are exceptions at the HTTP protocol layer These include authentication errors, invalid cookies, and so on You can expect to see protocol exceptions if, for example, you have to supply login credentials as part of your HTTP request but fail to do so Timeouts, with respect to HTTP calls, come in two flavors: connection timeouts and socket timeouts.

Content providers offer two ways of passing a where clause: Through the URI Through the combination of a string clause and a set of replaceable string-array arguments We will cover both of these approaches through some sample code.

Imagine you want to retrieve a note whose ID is 23 from the Google notes database. You d use the code in Listing 3 23 to retrieve a cursor containing one row corresponding to row 23 in the notes table.

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DSLs are programming languages that are focused on one problem domain. That problem domain can be anything: text processing, image manipulation, configuration, page layout, and so on. This focus on a single domain is what separates DSLs from general-purpose programming languages such as OCaml. OCaml is designed to be able to solve problems in a variety of problem domains. DSLs can be a real boon in complicated programs. These languages are often called extension languages because they are designed to extend some core functionality. The Emacs text editor, with its extension language Emacs Lisp, is probably one of the best examples of how powerful having an extension language can be. Another is Microsoft Excel with Visual Basic for Applications. These two applications have a programming language embedded within them that enables a user to extend the functionality of the application in ways that the original programmer did not do. However, DSLs are not restricted to extension languages. SQL, for example, is a DSL. Many report generators use their own DSL to describe reports. Make is another application that uses a DSL to accomplish its goals. When writing a complicated application that might have complex customization or actions, consider writing a DSL for it, thus allowing extension to be done this way rather than via code changes. One of the biggest questions to ask when making this decision is this: is it worth it Writing a small language is not hard to do using tools such as ocamllex and ocamlyacc, but writing a good language is always hard no matter which tools you use.

Listing 3 23. Passing SQL WHERE Clauses Through the URI Activity someActivity; //..initialize someActivity String noteUri = "content://com.google.provider.NotePad/notes/23"; Cursor managedCursor = someActivity.managedQuery( noteUri, projection, //Which columns to return. null, // WHERE clause null); // Order-by clause.

A connection timeout can occur if the HttpClient is not able to connect to the HTTP server if, for example, the URL is not correct or the server is not available A socket timeout can occur if the HttpClient fails to receive a response within a defined time period In other words, the HttpClient was able to connect to the server, but the server failed to return a response within the allocated time limit Now that you understand the types of exceptions that might occur, how do you deal with them Fortunately, the HttpClient is a robust framework that takes most of the burden off your shoulders In fact, the only exception types that you ll have to worry about are the ones that you ll be able to manage easily.

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