Posts about Java concurrent utils package. Concurrent collections. blocking queues, non-blocking queues, synchronizers.
Java programming language provides two ways to implement a class whose instances are to be executed by a thread. By implementing Runnable interface By implementing Callable interface Since there are two options so they must have some differences in the features they offer, that’s what we’ll discuss in this post;…
In this post we’ll learn about CompletableFuture class in Java along with examples to understand the functionalities this class provides. CompletableFuture in Java CompletableFuture is used for asynchronous computation of the task where the task is executed by a separate thread and the result is returned when it is ready.…
ConcurrentLinkedDeque in Java is an unbounded concurrent deque which is thread-safe. It stores its elements as linked nodes where each node stores a reference to both previous and next nodes. ConcurrentLinkedDeque in Java implements Deque interface and is part of java.util.concurrent package. How ConcurrentLinkedDeque differs from the blocking Deque implementations…
CopyOnWriteArraySet in Java extends the AbstractSet which in turn implements the Set interface and is part of java.util.concurrent package. How CopyOnWriteArraySet differs from other Set implementations in Java Collections framework is that it is thread-safe. Table of contents CopyOnWriteArraySet internal implementation in Java Features of the CopyOnWriteArraySet Java CopyOnWriteArraySet constructors…
ConcurrentSkipListSet in Java is a sorted set just like TreeSet but it is also scalable and concurrent so ConcurrentSkipListSet is thread-safe and can be accessed by multiple threads safely. In ConcurrentSkipListSet operations like add and remove are done atomically using compare and swap (CAS). These are lock-free so overhead of…
This post talks about the ConcurrentSkipListMap class from the java.util.concurrent package and the interface ConcurrentNavigableMap this class implements. ConcurrentSkipListMap in Java ConcurrentSkipListMap is a thread-safe, scalable Map that stores its elements in sorted manner. By default map is sorted according to the natural ordering of its keys, or by a…
In this post we’ll see two of the interesting features of the concurrent API, Callable and Future in Java. Table of contents Callable in Java Callable interface Running a Callable task using ExecutorService Java Callable and Future example Future in Java Callable and Future example Callable in Java Consider a…
LinkedBlockingQueue in Java is an implementation of BlockingQueue interface and is part of java.util.concurrent package. LinkedBlockingQueue has the features of both ArrayBlockingQueue and DelayQueue. ArrayBlockingQueue is a bounded blocking queue where as DelayQueue is an unbounded blocking queue. LinkedBlockingQueue sits in the middle as it is an optionally-bounded blocking queue…
ConcurrentLinkedQueue in Java is an unbounded queue which is thread-safe. It stores its elements as linked nodes where each node stores a reference to the next node. ConcurrentLinkedQueue class implements Queue interface and is part of java.util.concurrent package. How ConcurrentLinkedQueue differs from the BlockingQueue implementations like ArrayBlockingQueue, PriorityBlockingQueue is that…
ArrayBlockingQueue is a bounded blocking queue which internally uses an array to store elements. This queue orders elements FIFO (first-in-first-out). The head of the queue is the element that has been on the queue the longest time. The tail of the queue is that element that has been on the…
