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Version 1.5
Version 1.4
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OpenTop Version 1.4


The following notes give an insight into the new features of OpenTop 1.4. For further information we recommend taking a look at the Version 1.4 API Reference.

New HTTP Client

Many applications make use of OpenTop's HTTP client stack, even though some of them may be unaware of it due to the fact that they employ the polymorphic URLConnection class. The new HTTP client framework has greatly extended the original mechanism with 7 fully-documented classes within a new ot::web namespace, giving applications the ability to control and further extend the HTTP client stack.

The ot::web namespace provides classes which enable applications to:-

  • use (and re-use) persistent HTTP connections
  • communicate via configurable HTTP proxy servers
  • transparently support secure (HTTPS) connections using SSL/TLS, including secure proxy tunnelling
  • be RFC-compliant with both HTTP/1.0 and HTTP/1.1
  • use memory-efficient streaming of both input and output (POST) entities
  • modify and extend the framework classes through the use of customized request handlers

Simply recompiling existing OpenTop applications will allow them to enjoy the performance benefit of persistent connections and support for secure (HTTPS) URLs. For a more complete picture of the new HTTP client framework, refer to the ot::web namespace API Reference.

Secure communications using SSL/TLS

The 21st century has seen a rapid growth in the use of secure communication protocols. This trend has been most evident in the securing of HTTP transactions over the World Wide Web, but secure network protocols are increasingly being employed by other client-server and peer-peer applications. This trend has been recognized by the OpenTop designers, who have carefully integrated support for the SSL/TLS protocols into the fabric of OpenTop.

OpenTop's SSL/TLS support comprises 14 new documented classes in the new ot::ssl namespace. Like much of the OpenTop API, these classes are based on equivalent interfaces from the Java API, resulting in a tried, tested and widely understood design which can easily be integrated into both new and existing OpenTop applications.

64-bit Integer and large file support

Most processors in today's desktop and server machines support 64-bit integers and the associated arithmetic operations. OpenTop now provides the Int64Type typedef, which provides cross-platform support for native 64-bit integers.

Over recent years, the move to 64-bit quantities has been echoed in the size of data files used by applications. OpenTop has been extended in version 1.4 to recognize, interrogate and manipulate large files.

Random-access and fixed-format data files

Two important new features added to the ot::io namespace are support for random-access files and interfaces to provide fixed-format I/O.

The RandomAccessFile class allows a file to be opened and dynamically positioned to any byte offset. In addition to reading and writing arrays of bytes, RandomAccessFile supports the new DataInput and DataOutput interfaces for fixed-format I/O.

Fixed-format I/O involves writing numeric and string data in a fixed-size platform-independent manner so that the same data can be written and read on different platforms, perhaps employing different physical architectures. The new DataInput and DataOutput classes provide the necessary interface and these are implemented in both the RandomAccessFile already mentioned and two new filter stream classes: DataInputStream and DataOutputStream.

Availability

OpenTop 1.4 was released in February 2004. Online ordering, secure purchasing and immediate download are available from our online purchasing page.

OpenTop 1.4 is a commercial product developed by ElCel Technology.


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