Home » Tag Archives: Concurrency (page 6)

Tag Archives: Concurrency

Multithreading and Concurrency Interview Questions and Answers – The ULTIMATE List (PDF Download)

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EDITORIAL NOTE: Concurrency is always a challenge for developers and writing concurrent programs can be extremely hard. There is a number of things that could potentially blow up and the complexity of systems rises considerably when concurrency is introduced. However, the ability to write robust concurrent programs is a great tool in a developer’s belt and can help build sophisticated, ...

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Beyond Thread Pools: Java Concurrency is Not as Bad as You Think

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Apache Hadoop, Apache Spark, Akka, Java 8 streams and Quasar: The classic use cases to the newest concurrency approaches for Java developers There’s a lot of chatter going around about newer concepts in concurrency, yet many developers haven’t had a chance to wrap their heads around them yet. In this post we’ll go through the things you need to know about ...

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How to Use Callable and FutureTask

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Introduction Since Java 1.5 there has been a new set of objects under java.util.concurrent.  This package has a number of different classes including thread queues.  I could have used those when I was programming with Java 1.2!  When I started looking at the new toys I became hesitant.  What is this Callable thing and what is the Future?  It turns ...

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Java Concurrency Tutorial – Locking: Intrinsic locks

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In previous posts we reviewed some of the main risks of sharing data between different threads (like atomicity and visibility) and how to design classes in order to be shared safely (thread-safe designs). In many situations though, we will need to share mutable data, where some threads will write and others will act as readers. It may be the case ...

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EJB 3.x : Lifecycle and Concurrency models (part 2)

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This is the second post of the two part series. The first part covered the life cycle and the concurrency behavior of Stateful and Stateless EJBs. I’ll cover Singleton EJBs in this post. The Singleton pattern is arguably the most used (some times misused!) pattern out there.         Java EE frees us from writing explicit code (like one on the above ...

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Java Concurrency Tutorial – Thread-safe designs

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After reviewing what the main risks are when dealing with concurrent programs (like atomicity or visibility), we will go through some class designs that will help us prevent the aforementioned bugs. Some of these designs result in the construction of thread-safe objects, allowing us to share them safely between threads. As an example, we will consider immutable and stateless objects. ...

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Java Concurrency Tutorial – Visibility between threads

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When sharing an object’s state between different threads, other issues besides atomicity come into play. One of them is visibility. The key fact is that without synchronization, instructions are not guaranteed to be executed in the order in which they appear in your source code. This won’t affect the result in a single-threaded program but, in a multi-threaded program, it ...

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Java Concurrency Tutorial – Atomicity and race conditions

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Atomicity is one of the key concepts in multi-threaded programs. We say a set of actions is atomic if they all execute as a single operation, in an indivisible manner. Taking for granted that a set of actions in a multi-threaded program will be executed serially may lead to incorrect results. The reason is due to thread interference, which means ...

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EJB 3.x : Lifecycle and Concurrency models (part 1)

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Java EE component life cycle and concurrency related details might not be new for seasoned professionals, but it is something which can take time to sink in for beginners.                 As far as EJBs are concerned, understanding their life cycle (and related concurrency scenarios) is extremely critical in order to ensure appropriate usage and solution ...

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Java’s Volatile Modifier

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A while ago I wrote a Java servlet Filter that loads configuration in its init function (based on a parameter from web.xml). The filter’s configuration is cached in a private field. I set the volatile modifier on the field. When I later checked the company Sonar to see if it found any warnings or issues in the code I was a bit ...

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