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Take note that the $name property isn t taken from the identifier of the function itself, but from the key we used when we declared the method The main purpose of the wrapper function is to keep track of which method is currently called When we call a method from an instance, the wrapped method sets the internal $caller property of the instance to itself The $caller property is used to determine which current function is running When we call tibbsgetName() for example, the $caller property will be set to the getName method Now when we call thisparent() inside a method, the function checks the $caller property to determine which of the methods invoked it If there s no $caller property, it will throw an error, preventing parent from being called from outside a method.

There are a number of ways to start designing a new form there may already be a schema defined (including the schema for a web service), and the form must be designed against that schema. Alternatively, the form may be the first part of a new solution, so the form will, in effect, define what the remainder of the solution looks like (or the form may be designed with the intent that it be stand-alone rendering user data into XML is the entire intent of the current solution). Of course, the form you re designing may be an intersection of the two a business process may exist with a currently defined schema, and you might be designing an electronic version of a paper form to integrate with the process. Whenever possible, I strongly recommend designing a schema first. The main reason is that from a schema, all things can flow. There are tools that can take an XML schema and render a database schema (such as Altova s XMLSpy). Microsoft s BizTalk Server uses the schema as its common denominator for XML document translation. Obviously, InfoPath works with XML

The unit test, shown in Listing 7-16, writes a string to a newly created file in the virtual cluster HDFS, and then reads the string back from the file to verify that the same string can be read back. The test has the standard stylized framework you will see in all of the sample code. Any code that allocates objects that hold system-level file descriptors is done in a try block. The try block has a finally clause where the system-level file descriptors are closed. This pattern, if rigorously applied, will greatly reduce job failures when the jobs are running at large scales. listing 7-16. The Actual Test Code with the JUnit 4 @Test Annotation /** A very simple unit test that uses the virtual cluster. * * The test case writes a single file to HDFS and reads it back, verifying the file contents. * * @throws Exception */ @Test public void createFileInHdfs() throws Exception { final FileSystem fs = getFs(); assertEquals( "File System is hdfs", "hdfs", fs.getUri().getScheme()); Path testFile = new Path("testFile"); FSDataOutputStream out = null; FSDataInputStream in = null; final String testData = "HelloWorld";

If there s a $caller, though, the parent method will store its $name property to determine the name of the method and then access the superclass using $ownerparent The method then checks whether there s an overridden method from the superclass and invokes it, returning the arguments Let s trace how it all works with this example:.

Summary