I came across the following e example to implement custom suspend and wait from some website. I am more concerned about the ob1.mysuspend() and ob1.myresume() calls. When my suspend is called then ob1 will be placed into the blocking queue associated with the runnable object it is using. When ob1 calls myresu…
Tag: multithreading
Immutable class while using a cache
While going through JCIP, I came across the below code snippet which was considered as Immutable. However the explanation provided makes me confused. OneValueCache wouldn’t be immutable without the copyOf calls in the constructor and getter. Arrays.copyOf was added as a convenience in Java 6; clone woul…
What happens at runtime when we have multiple Java threads?
I am trying to understand what happens when you have multiple thread objects and you call start on them. To this end, I have written the following code: So the output I get involves Thread-x, where x is from 0 to 99, but they are in different order than the natural order (i.e. 0,1,2,3,…). I expected thi…
Spring controller how to serve only 1 request each time, and discard other requests received for the same method until first request has finished
So as the title describes I want to achieve the following I want the code to be executed only for 1 request that comes at a time. The execution of the code inside the synchronized block can last about 1 hour. In the mean time I would like each other request that arrives to that method to be cancelled. Is
Spring Boot Batch – Stop and Start a multithreaded step with CompositeItemWriter
I am trying to stop and start a multithreaded step through Scheduler. But I am getting exception as If I understand correctly we wont be able to restart an multithreaded step. But I am not restarting. I stop the job by stepExecution.setTerminateOnly() through ChunkListener() and trying to start this by jobLau…
Why does wait(100) cause synchronized method to fail in multi threaded?
I am referencing from Baeldung.com. Unfortunately, the article does not explain why this is not a thread safe code. Article My goal is to understand how to create a thread safe method with the …
OptaPlanner Multithreading: Can I retrieve internally resolved “moveThreadCount” for reproducibility?
OptaPlanner v8.0.0.Final I want to set my OptaPlanner engine configs’ moveThreadCounts to AUTO, but I need to be able to reproduce runs even if it means I must take the moveThreadCount value from the logs/stdout/whatever (that is the plan). I see the value is resolved in DefaultSolverFactory::buildSolve…
isInterrupted() still returns “false” even after the Thread.State is “TERMINATED” in Java’s Thread – why?
When thread gets terminated (Thread.State.TERMINATED) it is still not interrupted. Why? I found this, and I found this, but neither answers my question.I have tried this out on OpenJDK 11 and Oracle JDK 16 – no difference, same result. I have been working with Java for more than 10 years now, and multit…
creating multiple threads with a unique id (threads do not overlap)
UPDATE I’m solving a producer / consumer problem, and I want to create a few producers and consumers (several threads) and I have a question how can I create several threads correctly so that one task is not performed by two threads (each thread does a different task). code: I tried to do it just in a l…
Java 11 hashmap deadlock [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question Here are a few lines of code which I wrote to test hashmap’s performance in a multi-thr…