I know the difference between the two clearly. Concurrency is performing multiple tasks alternately, while parallelism is performing multiple tasks at once. However, there is confusion in this code because a certain instructor has a different opinion than me. Here is code: I thought that running this code on …
Tag: concurrency
Thread-safety of int field in Java
If class has field with int type (not Atomic Integer and without volatile keyword) and all access to this field happens under read/write locks – will this field thread-safe in this case? Or in some moment some thread can see not real value of this field but something from cache? Answer Get answer from @…
Stop running Java JUnit test method after predefined time without failing the test
I have a class that starts multiple threads which all run while(true) loops. Is it possible to have an Assert statements on the state of a test after it has run for a certain amount of time? The Timeout functionality would work, if it didn’t fail the test. This is a contrived example to show what I̵…
Is replacing one java object reference with another considered thread safe, or are there potential synchronicity issues I’m overlooking?
I’m rolling my own simple caching solution to improve the UX of a lengthy lookup. The basic outline is that I have a class handling all accountId lookups, and another class called AccountListCache with two variables: a timestamp indicating when it was created, and a List object containing a whole bunch …
How to use Throughput Shaping Timer from JMETER API using Java code?
enter image description here 1: https://i.stack.imgur.com/sRx3n.jpg**strong text**## I am trying to write the Java program to get the input something like this for multiple rows and process it by creating concurrency thread group which can generate number of threads from tstfeedback function and complete the …
sorting files using multithreading in java
I was given an assignment to write all ordered contents of given files into a result.txt. At first, the filenames are split into different Arraylists where each file contains a label in a format #n/N where N is the total number of files. e.g. British explorer James Clark Ross led the first expedition to reach…
Callable in ExecutorService with shared data
I have a scenario which I have somehow simulated into the following: I have a list of Callable tasks that are being executed in 4 threads. The execution should return a value(a Map<String, String>). Each task has an item attribute. If for a task I get timeout (I have a Timeout flag in a Map<> that…
Can another thread see an effectively immutable object in an inconsistent state if it is published with a volatile reference?
According to Java Concurrency in Action if we have the following class: and we initialise an instance of this class and publish it in a non-safe way (through a simple public field for example), then the assertCorrectness() might indeed throw an AssertionError, if called from another thread. In other words, th…
Android recycle view update sort list with concurrency issue
I have a sorted list I would like to use to hold objects for maintaining a recycleview as usual. The api I am interfacing with passes me updates through an interface callback using multiple threads. This api can add, remove or update object state. When the app opens there is a flurry of adds, removes and upda…
How to control child-thread lifecycle and synchonize it with main-thread?
I am trying to create another thread that processes data while main thread doing some more. Main thread must wait till another thread finishes doStuff with all elements. And my implementation is pretty straight forward. Please, take a look at processData and tell me is there some more Java-like way to do it? …