CompletableFuture isan extension to Java's Future APIwhich was introduced in Java. A Future is used as a reference to the result of an asynchronous computation. It provides an isDone() method to check whether the computation is done or not, and a get() method to retrieve the result of th...
Future<User> u = getUser(int id); Boolean hasAddress = u.get().hasAddress(); The Java 8 CompletableFuture takes Java multithreading to new heights. For the example above, now you can rewrite it like below. The CompletableFuture.thenApply() method allows you to transform a Future<T> to...
public void testCompletableFuture() { // 四、CompletableFuture API /* * Returns a new CompletableFuture that is asynchronously completed by a task * running in the given executor with the value obtained by calling the given Supplier. */ CompletableFuture.supplyAsync(list.stream().mapToInt(Intege...
4、使用Optional作为方法返回值,就不需要判断什么时候返回值是不存在。 个人观点:目前还是很少用JAVA 8的Optional对象,需要进一步学习。但是非常赞同作者这个建议,null会导致很多NPE问题 建议4、“Unlift” methods whenever possible(使用空容器代表null值) 需要避免方法如下 // AVOID: CompletableFuture<T>method(Comple...
java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:646) at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ...
APM Insight Java agent now includes CompletableFuture for tracking asynchronous functions.February 28, 2023 ServerEnhancement CPU Utility monitoring In addition to CPU utilization, it is now possible to monitor CPU utility% of your servers with Site24x7. View the ever growing list of server perform...
This Context Map reflects the current state of affairs, not what will be in the future. It is necessary to avoid formalities in the process of creating the map. Too much detail only hinders the creation process. The natural course of events is the coincidence of context boundaries with the ...
Java A variable of primitive type or type String, that is final and initialized with a compile-time constant expression, is called a constant variable. publicfinalintA_CONSTANT=5; All compile-time constants are inlined during compile time i.e. their references will be replaced with their values...
Java Starting from JDK 5 a new feature known as JVM Ergonomics was added. The feature is self turning of JVM based on underlying system resources. JVM determines some of the options values automatically. It is an attempt to provide a good performance from the JVM with a minimum of command ...
针对线程池任务Future接口,FutureTask类,CompletionService接口,CompletableFuture类的分析 Future模式 【1】Future模式是多线程开发中常见的设计模式,它的核心思想是异步调用。对于Future模式来说,它无法立即返回你需要的数据,但是它会返回一个契约,将来你可以凭借这个契约去获取你需要的信息。