List/Grid Tag Archives: Concurrency

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Throttling Task Submission with a BlockingExecutor

The JDK’s java.util.concurrent.ThreadPoolExecutor allows you to submit tasks to a thread pool and uses a BlockingQueue to hold submitted tasks. If you have thousands of tasks ...
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Java final fields on x86 a no-op?

I have always enjoyed digging in to the details of multi-threaded programming, and always enjoy that despite reading for years about CPU memory consistency models, wait-free and lock-free ...
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How is ThreadLocal implemented?

This is a follow-up to my last week post, where I explained the motivation behind ThreadLocal usage. From the post we could recall that ThreadLocal is indeed a cool concept if you wish ...
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What are Reentrant Locks?

In Java 5.0 a new addition was made to enhance the intrinsic locking capabilities, called as Reentrant Lock. Prior to this, ‘synchronized’ and ‘volatile’ were the means for ...
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When and how to use a ThreadLocal

As our readers might already have guessed, I deal with memory leaks on a daily basis. A particular type of the OutOfMemoryError messages has recently started catching my attention – ...
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Non-Blocking Asynchronous Java 8 and Scala’s Try/Success/Failure

Inspired by a recent newsletter from Heinz Kabutz as well as Scala’s Futures which I investigated in my recent book, I set about using Java 8 to write an example of how to submit ...
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Ahoy There Callbacks!

Because it’s my bag, I like JavaScript. In fact, I’ve grown to love JavaScritp’s asynchronous callback oriented style of programming. Consequently, when I find myself in a non-JavaScript ...
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Fine-Grained Concurrency with the Guava Striped Class

This post is going to cover how to use the Striped class from Guava to achieve finer-grained concurrency. The ConcurrentHashMap uses a striped locked approach to increase concurrency ...
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Scalable Counters For Multi Core

Counters are required everywhere , for e.g. to find key KPI of application, load on application, total number of request served, some KPI for finding throughput of application & ...
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Simple and lightweight pool implementation

Object pools are containers which contain a specified amount of objects. When an object is taken from the pool, it is not available in the pool until it is put back. Objects in the ...
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