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Complete article "Java Singleton Pattern Explained" Four different ways to implement singleton in Java "Ways to implement singleton in Java" Book extract: Implementing the Singleton Pattern in C# by Jon Skeet; Singleton at Microsoft patterns & practices Developer Center; IBM article "Double-checked locking and the Singleton pattern" by Peter Haggar
In software engineering, the initialization-on-demand holder (design pattern) idiom is a lazy-loaded singleton. In all versions of Java, the idiom enables a safe, highly concurrent lazy initialization of static fields with good performance. [1] [2]
In software engineering, double-checked locking (also known as "double-checked locking optimization" [1]) is a software design pattern used to reduce the overhead of acquiring a lock by testing the locking criterion (the "lock hint") before acquiring the lock.
Java provides the keyword synchronized to lock code blocks, methods or objects [11] and libraries featuring concurrency-safe data structures. Objective-C provides the keyword @synchronized [ 12 ] to put locks on blocks of code and also provides the classes NSLock, [ 13 ] NSRecursiveLock, [ 14 ] and NSConditionLock [ 15 ] along with the ...
Synchronization has several aspects. The most well-understood is mutual exclusion—only one thread can hold a monitor at once, so synchronizing on a monitor means that once one thread enters a synchronized block protected by a monitor, no other thread can enter a block protected by that monitor until the first thread exits the synchronized block.
See Singleton pattern. A singleton is also a variable that is only used once in a program, usually indicating a programming mistake. See singleton variable. From the start of the term 'Singleton pattern': In software engineering, the singleton design pattern is designed to restrict instantiation of a class to one (or a few) objects.
Software design patterns offer finer granularity compared to software architecture patterns and software architecture styles, as design patterns focus on solving detailed, low-level design problems within individual components or subsystems. Examples include Singleton, Factory Method, and Observer. [35] [36] [37]
In computer science, a ticket lock is a synchronization mechanism, or locking algorithm, that is a type of spinlock that uses "tickets" to control which thread of execution is allowed to enter a critical section.