Critique of the IO monad being viewed as a state monad operating on the world
The IO monad in Haskell is often explained as a state monad where the state is the world. So a value of type IO a monad is viewed as something like worldState -> (a, worldState).
What is preferred for file I/O in Java? [closed]
Closed 9 years ago.
What is preferred for file I/O in Java? [closed]
Closed 9 years ago.
How are Java ByteBuffer’s limit and position variable’s updated?
There are two scenarios: writing and reading
Writing:
Whenever I write something to the ByteBuffer by calling its put(byte[]) method the position variable is incremented as: current position + size of byte[] and limit stays at the max.
If, however, I put the data in a view buffer then I will have to, manually, calculate and update the position
Before I call the write(ByteBuffer) method of the channel to write something, I will have to flip() the Bytebuffer so that
position points to zero and limit points to the last byte that was written to the ByteBuffer.
Reading:
Whenever I call the read(ByteBuffer) method of a channel to read something, the position variable stays at 0 and the limit variable of the ByteBuffer points to the last byte that was read. So, if the ByteBuffer is smaller than the file being read, the limit variable is pushed to max
This means that the ByteBuffer is already flipped and I can proceed to extracting the values from the ByteBuffer.
Please, correct me where I am wrong 🙂
Where do you use Java Channels?
I have only used Java Channels and BufferedOutputStream and the input counter part for reading and writing simple integers and some strings here and there to the file.
However I do not understand the use of all these classes when there is java.util.Scanner class that provides easy ways to read and write to the files.
Java veterans please tell me the use of Channels and Streams over Scanner.
At what point is asynchronous reading of disk I/O more efficient than synchronous?
Assuming there is some bit of code that reads files for multiple consumers, and the files are of any arbitrary size: At what size does it become more efficient to read the file asynchronously? Or to put it another way, how small must a file be for it to be faster just to read it synchronously?
Model-View-Controller (MVC) Which component handles save/load operations?
In a traditional MVC application, which component (model, view, or controller) is responsible for reading/writing the model to/from disk?
Need some input on storing stdin, stdout, stderr information for debugging
I am working with a legacy system that is not too bad, but I thought of making some improvements to it, and I wanted to solicit your feedback to help me make good decisions. The platform is Linix (different flavors of it).
Using assembly to write to a file
I am working with a trading application (reading data from the exchange) which generates a bucket load of data on a per second basis. We have different “log-levels” but even the minimal log-level generates so much data ! This process of log creation is quite I/O intensive.
creating simple states for a stateless input
Given an input device (basically a keyboard) that reports keyup and keydown, how may I most efficiently store and retrieve information about which keys are currently depressed? My first thought was a dynamic array, but maintaining and searching a dynamic array seems like a serious drain on resources.