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➔ Software developer - Team lead ➔ Java Champion ➔ Medellin Java Users Group Leader ➔ hibernate/hibernate-validator Contributor ➔ Duke’s Choice Award Winner ➔ Eclipse Collections contributor

➔ Professional with 10+ years ➔ Principal Software Engineer - NY ➔ NYJavaSIG Leader ➔ graciano.dev ➔ Twitter: @rodrigograciano

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● Concurrency when we have many task, largely independent, and we use the same resource to do them at a time ● Parallelism is when we want to do one task, and we split up in multiple subtasks

A Thread is an independent path of execution that allows a program to operate more efficiently by doing multiple things at the same time. Threads can be used to perform complicated tasks in the background without interrupting the main program.

● Synchronous: when we wait to finish a task before moving to the next one ● Asynchronous: when we move to another task before it finishes

● Thread t = new Thread( ()-> this.doSomething( thing )); t.start(); ● ExecutorService executor = Executors.newFixedThreadPool( 10 ); Future> future = executor.submit( ()-> this.doSomething( thing )); ● CompletableFuture.runAsync( ()-> this.doSomething( thing )); ● Thread.builder().virtual().name("name").task(() -> this.doSomething( thing )).start();

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Stream API CompletableFuture Creation Chained operations Return forEach runAsync thenAccept / thenRun void map supplyAsync thenApply CompletableFuture

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CompletableFuture::runAsync (Runnable runnable) CompletableFuture::supplyAsync (Supplier supplier) CompletableFuture::runAsync (Runnable runnable, Executor executor) CompletableFuture::supplyAsync (Supplier supplier, Executor executor)

static ExecutorService newCachedThreadPool() static ExecutorService newFixedThreadPool (int nThreads) static ScheduledExecutorService newScheduledThreadPool (int corePoolSize) static ExecutorService newSingleThreadExecutor() static ScheduledExecutorService newSingleThreadScheduledExecutor() static ExecutorService newWorkStealingPool()

T::get () throws InterruptedException , ExecutionException T::get (long timeout, TimeUnit unit) throws InterruptedException , ExecutionException , TimeoutException T::getNow (T valueIfAbsent) T::join()

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