Streaming and decorator construction in java i/o, JAVA Programming

Assignment Help:

Java output and input is described in terms of an abstract concept named a "stream", which is a sequence of data.

There are 2 types of streams.

1.      Byte streams (8 bit bytes)  Abstract classes are: OutputStream and InputStream

2. Character streams (16 bit UNICODE) Abstract classes are: Writer and Reader

 java.io.* classes need the decorator design pattern. The decorator design pattern added responsibilities to objects at runtime. Decorators are more reliable than inheritance because the inheritance added responsibility to classes at compile time. The java.io.* classes access the decorator pattern to construct different combinations of behavior at runtime based on some basic classes.

 

 The new I/O (NIO) offers better performance and better scalability?

 

Java has long been not suited for deploying programs that perform a lot of I/O functions. Furthermore, commonly needed tasks such as non-blocking, file locking and asynchronous I/O operations and ability to map file to memory were not require. Non-blocking I/O operations were found through work around such as multithreading or using JNI. The New I/O API in J2SE 1.4 has modified this situation.

A server's ability to handle several client requests effectively depends on how it performs I/O streams. When a server has to communicate hundreds of clients simultaneously, it has to be able to use I/O services frequently. One way to cater for this scenario in Java is to use threads but having almost one-to-one ratio of threads (100 clients will have 100 threads) is prone to enormous thread overhead and may give in scalability and performance problems due to consumption of memory stacks and CPU context switching. To overcome this situation, a new set of non-blocking I/O classes have been produced to the Java platform in java.nio package.

The non-blocking I/O mechanism is making around Channels and Selectors. Channels, Selectors and Buffers are the core of the NIO.

 

 

885_Untitled.png

 

A Channel class presents a bi-directional communication channel in between datasources such as a file, a socket, or an application component, which is capable of producing one or more I/O operations such as writing or reading. Channels may be non-blocking, which means, no I/O operation can wait for data to be written or read to the network. The nice thing about NIO channels is that they may be closed and asynchronously interrupted. So if a thread is blocked in an I/O operation on a channel, another thread may interrupt that blocked thread.

 


Related Discussions:- Streaming and decorator construction in java i/o

Implement a driver program to test out all constructors, Implement a class ...

Implement a class  Book  (Book.java). A book will have three instance variables: a  title  (a String, for example: "Big Java" or "The Hitchhiker's Guide to the Galaxy"), an  author

Explain booleans in java, Explain Booleans in java? Booleans are named ...

Explain Booleans in java? Booleans are named after George Boole, a nineteenth century logician. Every boolean variable has one of two values, true or false. These are not the s

What is casting, What is casting? There are two types of casting, casti...

What is casting? There are two types of casting, casting among primitive numeric types and casting among object references. Casting among numeric types is used to convert large

What are checked and unchecked exception, What are Checked and UnChecked Ex...

What are Checked and UnChecked Exception? A checked exception is some subclass of Exception (or Exception itself), excluding class RuntimeException and its subclasses. Making a

Need professional framework coder with coding experience, Need Professional...

Need Professional Framework Coder with Video Coding Experience? Project Description: Professional Framework Coder with Video Coding experience. You must know API, Java, C++,

Use array to store values in a program, 1) Listing of the source code ( nam...

1) Listing of the source code ( named Rainfall.java ) for your program 2) Two sample output/execution/runs of your program Optional Group Work: This assignment may be done in

Socket in java networking and rmi, What Is a Socket in Java Networking and ...

What Is a Socket in Java Networking and RMI? Ans) A socket is one end-point of a two-way communication link among two programs running on the network. A socket is bound to a por

GUI, I have a GUI assignment due Friday noon and i can''t get my hand on it...

I have a GUI assignment due Friday noon and i can''t get my hand on it will anyone be able to solve it to me and what is the cost?

Rest client, Modify both of the above clients (to write separate clients) t...

Modify both of the above clients (to write separate clients) to extract the exchange rate from a live web service that performs currency conversion. You can choose a Java or a .NET

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd