Changes to concurrency tools in Java 8 and Java 9 __java

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Some changes have been made to the concurrent packages in Java 8 and Java 9, and the changes are summarized in this article.

changes in Concurrent package in Java 8

new classes and interfaces in Java.util.concurrent

Two new interfaces and 4 new classes were added:

Interface Completablefuture.asynchronouscompletiontask

Interface Completionstage

Class Completablefuture

Class Concurrenthashmap.keysetview

Class Countedcompleter

Class Completionexception

a new method of Java.util.concurrent.ConcurrentHashMap

The collection framework has been revised in Java 8 to add a number of aggregation methods based on stream and lambda expressions. So Concurrenthashmap also introduced 30 new methods, including a variety of foreach methods (foreach, Foreachkey, Foreachvalue, and Foreachentry), search methods (searching, sea Rchkeys, Searchvalues, and searchentries) and reduction methods (reduce, reducetodouble, Reducetolong, etc.).

Some other methods have been added, such as Mappingcount and Newkeyset. and the current version of the Concurrenthashmap is more suitable for cache, because it increases the check method when the key value does not exist.

new classes in the Java.util.concurrent.atomic

In order to compute count and sum concurrently, new Doubleaccumulator, Doubleadder, Longaccumulator, Longadder classes are introduced, providing a higher throughput rate than atomic.

a new method of Java.util.concurrent.ForkJoinPool

Static Commonpool () is added to provide a universal pool for forkjointask.

Two methods Getcommonpoolparallelism () and Commonpool () provide different configurations.

New Class Java.util.concurrent.locks.StampedLock

The new class Stampedlock provides three modes (write, read, and optimistic) to improve performance.

changes in Concurrent package in Java 9

The main is Jep 266:more concurrency Updates, including publish-subscribe, completablefuture interface strengthening and so on.

Support for reactive STREAMS Publish-subscribe Framework, four interfaces Processor, Publisher, subscriber, Subscription, container class Java.util.concurrent.f Low, Java.util.concurrent.SubmissionPublisher

Completablefuture class strengthens, supports delays, timeout, subclassing, and other methods

Tuning and modifying Javadoc

reference Documentation

Concurrency Utilities Enhancements in Java SE 8

Https://docs.oracle.com/javase/8/docs/technotes/guides/concurrency/changes8.html

Java 9′s Other new enhancements, part 6:concurrency

Https://www.javaworld.com/article/3198904/learn-java/java-9s-other-new-enhancements-part-6-concurrency.html

The Essential Java 9 Feature you Probably Never Heard of

https://blog.takipi.com/the-essential-java-9-feature-you-probably-never-heard-of/

Java 9′s Other New enhancements

Https://www.infoworld.com/article/3169289/java/java-9s-other-new-enhancements-part-2.html

Jep 266:more concurrency Updates

http://openjdk.java.net/jeps/266

Java 9 Series:concurrency Updates

https://www.voxxed.com/2016/10/java-9-series-concurrency-updates/

Some changes have been made to the concurrent packages in Java 8 and Java 9, and the changes are summarized in this article.

Source: Bird's Nest

colobu.com/2018/03/12/concurrency-utilities-enhancements-in-java-8-java-9/

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