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Furthermore, unlike sockets, the data sent using Datagrams is considered to be unreliable in that if a packet is lost it is not resent automatically by the protocol implementation, and when multiple packets are sent there is no guarantee that the packets will arrive in the same order they were sent Datagrams do not provide support for reassembling data packets into the order in which they were sent For these reasons, Datagrams are termed to be an unreliable data transport mechanism The term unreliable in this case is not necessarily a negative term It simply means that the protocol does not inherently support mechanisms to guarantee that data arrives in the order it was sent or that the data arrives at all There is nothing stopping an application from implementing these features itself, however So why use Datagrams Speed is one primary reason.

As you can see, XFA separates data from the XFA template, which allows greater flexibility in the structure of the data supported and allows data to be packaged separately from the form. Can I use iText to change the properties and appearance of an XFA form Yes and no. In the previous sections of this chapter, you ve used iText to manipulate the appearance of AcroForm fields, but none of these examples will change the XML definition inside the XFA stream. Changing an XFA form has to be done using XML tools. First extract the XFA XML from the PDF. Then add, remove, and update the tags and attributes between the <template> and </template> tags. Once this is done, use iText to replace the existing XFA stream with the updated one.

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difficult to verify in seven years when the certificate has expired, or when it has been revoked (the validation data may not be available in the future). The idea is to add new validation data and a new document timestamp to a Document Security Store in the PDF before the last document timestamp expires. This can be repeated multiple times, always before the expiration of the last document timestamp. This way, PAdES LTV makes it possible to extend the lifetime of protection for the document. Note that the DSS isn t part of ISO-32000-1 and it s not available in iText yet; it will be introduced in ISO-32000-2. We ll find out more about ISO-32000-2 in the next part of this book, but first let s summarize what we ve learned in this chapter.

Datagrams do not incur the overhead of ensuring that packets arrive in the correct order or that they arrive at all In some applications, such as audio streaming, a missing data packet may appear as static Raw speed is more important in this case than data integrity There are several datagram protocols available The most common is User Datagram Protocol (UDP) This is the protocol implementation provided by the reference implementation of the Generic Connection Framework However, the Datagram and DatagramConnection interfaces of the Generic Connection Framework are designed to allow implementations of different types of datagram protocols Other such protocols include IP and WDP along with proprietary beaming protocols that take advantage of the packet nature of datagrams for transmitting data.

12.5 Summary

When to use datagrams At first glance, datagrams seem to have a lot of marks against their use, especially since there is no reliability of data delivery, flow-control and error handling However, the raw speed benefits of datagrams may outweigh the data integrity issues for some applications Applications that stream real-time audio or video may be more concerned with speed than getting every byte of data transported and in a certain order If data is missing there may be some static over the speaker or on the screen momentarily Although static is not a desirable feature in such applications, the alternative would require the application to wait for all the data to arrive and to place it into the correct receiving order based on how the packets were sent before the data could be.

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