Blocking may or may not be the same as synchronous, depending on the context. When we talk about method calls, then a synchronous call can also be said to be blocking (I’ll get back to this in a bit), because the thread calling the method cannot proceed forward until the method returns. The antonym in … Read more
The Ruby IO documentation is not 100% clear on how this buffering works, but this is what you can extract from the documentation: Ruby IO has its own internal buffer In addition to that the underlying operating system may or may not further buffer data. The relevant methods to look at: IO.flush: Flushes IO. I … Read more
BufferedReader etc implements decorator pattern. Any Reader, e.g. FileReader or StringReader, can be decorated with the buffering feature, which is really source-oblivious. Other patterns java.util.Comparator<T> is a strategy pattern Anti-patterns To add to what others have said, these are several anti-patterns in the Java libraries: Antipattern: inheritance instead of composition From Effective Java 2nd Edition, … Read more
You have to call close() on the GZIPOutputStream before you attempt to read it. The final bytes of the file will only be written when the stream object is actually closed. (This is irrespective of any explicit buffering in the output stack. The stream only knows to compress and write the last bytes when you … Read more
The answer by @A.B. is correct, but it tries to conform to OP’s original program structure. I want to have a more readable alternative for newcomers who stumble upon this question (just like I did). use std::env; use std::fs; use std::io::{self, BufReader, BufRead}; fn main() { let input = env::args().nth(1); let reader: Box<dyn BufRead> = … Read more
Use System.setOut() (and System.setErr()) to redirect the output to an arbitrary printstream – which can be one that you read from programmatically. For example: final ByteArrayOutputStream myOut = new ByteArrayOutputStream(); System.setOut(new PrintStream(myOut)); // test stuff here… final String standardOutput = myOut.toString();
Updated Response: This seems like a bug specific to Windows – http://bugs.python.org/issue1521491. Quoting from the workaround explained at http://mail.python.org/pipermail/python-bugs-list/2005-August/029886.html the effect of mixing reads with writes on a file open for update is entirely undefined unless a file-positioning operation occurs between them (for example, a seek()). I can’t guess what you expect to happen, but … Read more
when i write import StringIO it says there is no such module. From What’s New In Python 3.0: The StringIO and cStringIO modules are gone. Instead, import the io module and use io.StringIO or io.BytesIO for text and data respectively. . A possibly useful method of fixing some Python 2 code to also work in … Read more
As commented, it’s not clear what you mean by merge. Taking available input “randomly” from either is complicated by InputStream.available not necessarily giving you a useful answer and blocking behaviour of streams. You would need two threads to be reading from the streams and then passing back data through, say, java.io.Piped(In|Out)putStream (although those classes have … Read more
Rapture IO might be worth trying. It provides some nice DSL for managing IO resources of various kinds.