By Dr. Peter C Dibble
Java courses have the acceptance of being gradual. functionality is assumed to be Java's exchange off for pass platform portability and better developer productiveness. Real-time structures call for on time responses and in lots of circumstances, usually are not fail. on the first glimpse, Java turns out really flawed for real-time structures. good, in the event you imagine so, you should learn Peter C. Dibble's e-book "Real-Time Java Platform Programming".
In truth, real-time specification is the 1st Java Specification Request (JSR001) within the Java neighborhood procedure and the reference implementation simply got here out in early 2002. So, this can be a very well timed booklet for this extremely important new program quarter of the Java platform.
The concentration of this publication isn't renowned Java syntax and API services. This publication spends loads of pages discussing what are real-time platforms, what are the necessities and why Java 2 normal version isn't really as much as the duty. therefore, we will research very important issues approximately real-time process layout and the philosophy in the back of the real-time Java standards. Java is simply a device. A real-time process engineer should still first understand the method layout in order that he can practice Java to the hot scenario. i locate the method of this e-book very effective.
Back to the query we raised within the first paragraph: It seems that functionality isn't THAT vital for a real-time method. we will have a gradual real-time approach however it has to offer constant and predictable effects everytime it runs. That consistency permits us to layout structures that we all know will meet the cut-off date. one in every of Java's center difficulties in real-time functions is the unpredictable habit of the rubbish collector. The publication have long discussions on new algorithms on reminiscence administration and the real-time Java method of this problem.
Of direction, rubbish collector layout and reminiscence administration is an instance of many real-time approach layout elements coated by way of this publication. different vital concerns comprise threads and synchronization. i locate this e-book very readable for either Java programmers drawn to real-time process engineering and real-time engineers drawn to Java instruments.
This e-book might be even greater if the writer can manage scattered pattern code segments right into a constant pattern program and use it to illustrate assorted usages of the real-time Java platform. additionally, the writer didn't conceal the set up and fundamentals of the reference implementation. Nor did he cover
real program situations on actual units or simulators. That makes it a section obscure the context of the examples.
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Additional resources for Real-Time Java Platform Programming
Software has the same dilemma. If it polls frequently, it does not accomplish much else; if it polls infrequently, it is unresponsive. Events. Wouldn't it be nice if the traffic light made a polite noise when it was about to turn green? You could then give most of your attention to e-mail and only switch attention to the light when it is about to change color.   The full treatment of real-world events requires the real-time Java enhancements to events and asynchronous interrupts discussed in Chapters 11 and 17.
To some extent interrupts can be predicted—not exactly when they will occur, but about how often they should be expected. This predictability lets the designer for a real-time system calculate how likely a block of code is to experience a given number of interrupts. In desperation, a program can mask interrupts. Interrupts can only be masked by system privileged code, and it increases interrupt response time (which is a critical performance figure), but interrupt masking absolutely prevents interrupt overhead while the mask is in place.
If we have a system with ten sources of interrupts, all the interrupts together will use 100 microseconds. Memory timing is worse than it looks. The specified access time for a memory chip is the best you can do. If the memory is DRAM, it needs to be refreshed from time to time. Many systems use direct memory access (DMA), which uses memory bandwidth and gets in the way of the processor. If you let it, DMA can use all the memory bandwidth. Then, the processor will not be able to access memory until the DMA completes.
Real-Time Java Platform Programming by Dr. Peter C Dibble