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The initialize method then invokes the protected method format and the wrapper function for format reconfigures the variables: it sets format as the current method and initialize as the caller method Because format is protected, the wrapper function checks whether format was called from another method inside the object It does this by checking the value of the caller method If the method was invoked by another method inside the object, caller will never be null In this example, the wrapper will see that the caller is initialize, and it will execute the format method as expected When we call the format method directly, the same sequence of operations is performed The wrapper function first sets format as the current method and the value of the caller method will be null, since format was called directly.

In the interest of completeness, I m presenting this topic here, even though SharePoint itself is covered more fully in the next chapter. SharePoint is a very natural complement to InfoPath. SharePoint form libraries offer a webbased repository for InfoPath form templates and data. In addition, through property promotion, key fields from an InfoPath form can be displayed in the form library interface, making it easier to find specific forms. Don t worry too much about what SharePoint is or does think of it first as a simple repository for InfoPath form data files with their associated template file. Publishing an InfoPath form template to a SharePoint site creates a form library (see Figure 5-12) and loads the form template as the default form for that library. SharePoint then provides an easy web-based way for users to fill out forms, store them, and edit them. (Microsoft Office SharePoint Server 2007 adds the capability to fill out forms through a browser interface.)

Usually, if you see the no live node contains block error, it will be in the log files for your applications. It means that the client code in your application that interfaces with HDFS was unable to find a block of a requested file. For this error to occur, the client code received a list of DataNode and block ID pairs from the NameNode, and was unable to retrieve the block from any of the DataNodes. This error commonly occurs when the application is unable to open a connection to any of the DataNodes. This may be because there are no more file descriptors available, there is a DNS resolution failure, there is a network problem, or all of the DataNodes in question are actually unavailable. The most common case is the out-of-file-descriptor situation. This may be corrected by increasing the number of file descriptors available, as described earlier in this chapter. An alternative is to minimize unclosed file descriptors in the applications. I ve seen DNS resolution failures transiently appear, and as a general rule, I now use IP addresses instead of hostnames in the configuration files. It is very helpful if the DNS reverse lookup returns the same name as the hostname of the machine.

Since a protected method like format can only be called by another method of the object, the wrapper function will throw an error when it sees that the value of the caller method is null You ll fully understand how this all works when you look at the wrapper function that we saw in the previous chapter Right before and just after the invocation of the actual method are a set of declarations that set the values of the current and the caller methods It is these values that enable the class system to.

If there are insufficient DataNodes available to allow full replication of a newly written block, the write will not be allowed to complete. This may result in a zero-length or incomplete file, which will need to be manually removed.