I am using Guava’s LoadingCache into my project to handle thread-{safe,friendly} cache loading and it works wonderfully well. However, there is a limitation. The current code defining the cache looks like this: I don’t specify an expiry time. The problem is that according to the values of the key, some associated values may expire and others may not. And CacheLoader
Tag: multithreading
Updating the JavaFx Gui with threads and or Tasks
I am creating a chat program that contains a GUI that I have created in the new version of the JavaFx Scene builder. I have a main method that extends application and i have a simpleController (that …
Distribute Range of Numbers between each threads
Config File I have a config file above in which I have number of threads I want to use and the client instance is able to use ID range from 1 to 1000 and suppose the client threads is set at 10, so each thread would have range of 100 id’s(basically by dividing end range with thread size) that it
why using volatile with synchronized block?
I saw some examples in java where they do synchronization on a block of code to change some variable while that variable was declared volatile originally .. I saw that in an example of singleton class …
Eclipse (Helios) debugger – getting different Results in Debug mode and Run mode
I am debugging RCP( multi-threaded GUI application) using Eclipse Helios. When I am executing the same method, I get a null pointer exception in run mode, but in debug mode, I don’t get any …
Thread Safe Singletons in Java
The wikipedia article on Singletons mentions a few thread safe ways to implement the structure in Java. For my questions, let’s consider Singletons that have lengthy initialization procedures and are …
What are the main uses of yield(), and how does it differ from join() and interrupt()?
I am a little bit confused about the use of Thread.yield() method in Java, specifically in the example code below. I’ve also read that yield() is ‘used to prevent execution of a thread’. My questions are: I believe the code below result in the same output both when using yield() and when not using it. Is this correct? What are,
Does any JVM implement blocking with spin-waiting?
In Java Concurrency in Practice, the authors write: When locking is contended, the losing thread(s) must block. The JVM can implement blocking either via spin-waiting (repeatedly trying to acquire the lock until it succeeds) or by suspending the blocked thread through the operating system. Which is more efficient depends on the relationship between context switch overhead and the time until
“Java DateFormat is not threadsafe” what does this leads to?
Everybody cautions regarding Java DateFormat not being thread safe and I understand the concept theoretically. But I’m not able to visualize what actual issues we can face due to this. Say, I’ve a …
wait() and notify() method , always IllegalMonitorStateException is happen and tell me current Thread is not Owner Why?
Answer You need to hold the lock on the object you want to wait on (you can only call it within a synchronized block). Also, calling wait on a Thread is very unusual and probably not what you want. I am not sure what you are trying to do, but could you be confusing wait with sleep? If you want