Design Patterns for e-Science by Henry Gardner, Gabriele Manduchi

By Henry Gardner, Gabriele Manduchi

This is a booklet a few code and approximately coding. The code is a case learn which has been used to teachcourses in e-Science atthe Australian NationalUniv- sity because 2001. scholars examine complicated programming abilities and strategies TM within the Java language. notably, they discover ways to observe priceless object-oriented layout styles as they steadily refactor and improve the software program. we expect our case study,EScope, is as with regards to actual lifestyles as you will get! it's a smaller model of a networked, graphical, waveform browser that's utilized in the regulate rooms of fusion power experiments all over the world. it's imperative “e-Science” within the feel of e-Science being “computer technology and data know-how within the provider of science”. it's not, speci?cally, “Grid-enabled”, yet we boost it in a fashion that would facilitate its deployment onto the Grid. the traditional model ofEScope interfaces with a specialized database for waveforms, and comparable information, identified asMDSplus. at the acc- panying CD, we have now supplied you with software program so that it will aid you installMDSplus,EScope and pattern info ?les onto home windows or Linux c- puters. there's a lot extra software program together with many models of the case learn because it will get outfitted up and gradually refactored utilizing layout styles. there'll be a house web-site for this publication on the way to include up to date information regarding the software program and different features of the case study.

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Add ( combo ) ; } public void i n i t i a l i s e () { g e t C o n t e n t P a n e ( ) . add ( c o m p o n e n t P a n e l ) ; setSize (600 ,400); setLocation (200 ,200); s e t D e f a u l t C l o s e O p e r a t i o n ( JFrame . 2 A Note on Programming Style } 45 } p u b l i c s t a t i c v o i d main ( S t r i n g [ ] a r g s ) { B i z a r r e C o m p o n e n t F r a m e o ur ESc o pe = new B i z a r r e C o m p o n e n t F r a m e ( ) ; o ur ESc o pe . 2 A Note on Programming Style In this book, we make no claim that our example programs display the bestever Java coding style, but we hope that they are reasonably clear and consistent.

1 A Remark on Exceptions All of the file handling methods described above throw exceptions when unforeseen error conditions occur. For example, your code may attempt to read 18 2 A Java Client for MDSplus DataInputStream BufferedInputStream FileInputStream Fig. 1. Schematic representation of a DataInputStream object showing the chaining to objects of type BufferedInputStream and FileInputStream. data from a file which does not exist. The block of code which contains the read method will stop executing and control will transfer to a appropriate catch block.

The unusual pattern of constructing a DataInputStream object by feeding it objects of the other classes is, in fact, a well-known design pattern known as the decorator . We will return to it much later in this book in Chapter 11. A schematic representation of the chaining involved in the pattern is shown in Fig. 1. 1 A Remark on Exceptions All of the file handling methods described above throw exceptions when unforeseen error conditions occur. For example, your code may attempt to read 18 2 A Java Client for MDSplus DataInputStream BufferedInputStream FileInputStream Fig.

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