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Many of Subversion s APIs include references to baton objects. These are void * arguments that are passed into Subversion s functions, usually along with a callback function of some sort. The baton gives the caller a way to include a pointer to whatever kind of data the callback function will need access to. When Subversion calls the callback later on, it will pass the baton in as one of the callback s arguments. The callback then casts the baton back to whatever data type the user originally passed in and makes use of the data in whatever way is appropriate. In other APIs, these kinds of arguments are often called void *ctx or void *userdata, but in Subversion they are called batons because they re passed around a lot. A generic stream can be created with svn_stream_create(), which takes a baton argument that will be passed to the svn_read_fn_t, svn_write_fn_t, and svn_close_fn_t function pointers associated with the stream via svn_stream_set_read(), svn_stream_set_write(), and svn_stream_set_close(). If you want to reset the baton, you can use svn_stream_set_baton(). Once you have a stream, you can use functions such as svn_stream_read() and svn_stream_readline() to read data from it, svn_stream_write() and svn_stream_printf() to write to it, and svn_stream_close() to close it when you re done with it. That s probably not entirely clear, so Listing 8-10 presents an example of how to create an svn_stream_t that returns zeroed-out data when you read from it. This isn t a particularly useful type of stream, but it does show you enough of the API that it s a good example. Listing 8-10. A /dev/zero Stream static svn_error_t * dev_zero_read (void *baton, char *buffer, apr_size_t *len) { int i; for (i = 0; i < *len; ++i) { buffer[i] = 0; }

As mentioned earlier, one of the benefits of writing code as individual modules is that you can write them in parallel But it goes further than that You can debug and test them individually as well Back in the analysis phase of the software life cycle, you devised a set of benchmarks and use cases that could measure the performance of your Web site as it was built By isolating the relevant user scenarios and benchmarks, and writing some code (a test harness) that reflects the metrics you designed to test the Web site against those benchmarks, you can prove the utility of this module before you move on to the next This process is known as unit testing.

You can toggle whether or not a widget is enabled via setEnabled() and see if it is enabled via isEnabled(). One common use pattern for this is to disable some widgets based on a CheckBox or RadioButton selection. You can give a widget focus via requestFocus() and see if it is focused via isFocused(). You might use this in concert with disabling widgets, to ensure the proper widget has the focus once your disabling operation is complete. To help navigate the tree of widgets and containers that make up an activity s overall view, you can use the following: getParent(): Finds the parent widget or container. findViewById(): Finds a child widget with a certain ID. getRootView(): Gets the root of the tree (e.g., what you provided to the activity via setContentView()).

One of the more frustrating aspects of this process is that as requirements change and targets are realigned, modules that you ve already written and tested will need to be altered and retested Indeed, this cycle of rebuilding and retesting is quite short, so a few utilities now allow you to automate the unit testing process The best of these is NUnit (http://wwwnunitorg) NUnit is the standard unit testing framework for NET applications and was itself written in C# By itself, NUnit comes with a choice of a rudimentary command-line interface or a rudimentary graphical interface, which both do the job, albeit not in a particularly attractive way NUnit on its own is great for testing business rules and data access code, but it needs help to test Web pages because they can t be run inside the NUnit framework.

return SVN_NO_ERROR; } svn_stream_t * make_dev_zero_stream (apr_pool_t *pool) { /* note that we don't need to store any specific data for use by our read callback, so our baton is NULL */ svn_stream_t *stream = svn_stream_create (NULL, pool); svn_stream_set_read (stream, dev_zero_read); return stream; } This code sets up a generic stream with a read function that fills in whatever buffer you pass it with zeros. From this example, you can clearly see how to implement your own stream that returns whatever data you wish, such as reading some specialized compressed format or pulling data out of a database; and with a bit more work you can use svn_stream_set_write() and svn_stream_set_close() to add specialized behavior when the user writes data to the stream or tries to close it. If you re just looking for a way to use a function that takes an svn_stream_t, and you don t want to go through the trouble of implementing your own stream type, you can get a generic file-backed stream with svn_stream_from_aprfile(), or one that wraps an svn_stringbuf_t with svn_stream_from_stringbuf(), or one that wraps stdout with svn_stream_from_stdout(). In most cases, these should be sufficient to allow you to call a given Subversion function without having to jump through the hoops necessary to define your own stream.