75 lines
2.1 KiB
Java
75 lines
2.1 KiB
Java
// concurrent/CompletableOperations.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.concurrent.*;
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import static onjava.CompletableUtilities.*;
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public class CompletableOperations {
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static CompletableFuture<Integer> cfi(int i) {
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return
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CompletableFuture.completedFuture(
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Integer.valueOf(i));
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}
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public static void main(String[] args) {
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showr(cfi(1)); // Basic test
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voidr(cfi(2).runAsync(() ->
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System.out.println("runAsync")));
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voidr(cfi(3).thenRunAsync(() ->
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System.out.println("thenRunAsync")));
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voidr(CompletableFuture.runAsync(() ->
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System.out.println("runAsync is static")));
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showr(CompletableFuture.supplyAsync(() -> 99));
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voidr(cfi(4).thenAcceptAsync(i ->
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System.out.println("thenAcceptAsync: " + i)));
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showr(cfi(5).thenApplyAsync(i -> i + 42));
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showr(cfi(6).thenComposeAsync(i -> cfi(i + 99)));
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CompletableFuture<Integer> c = cfi(7);
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c.obtrudeValue(111);
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showr(c);
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showr(cfi(8).toCompletableFuture());
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c = new CompletableFuture<>();
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c.complete(9);
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showr(c);
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c = new CompletableFuture<>();
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c.cancel(true);
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System.out.println("cancelled: " +
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c.isCancelled());
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System.out.println("completed exceptionally: " +
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c.isCompletedExceptionally());
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System.out.println("done: " + c.isDone());
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System.out.println(c);
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c = new CompletableFuture<>();
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System.out.println(c.getNow(777));
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c = new CompletableFuture<>();
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c.thenApplyAsync(i -> i + 42)
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.thenApplyAsync(i -> i * 12);
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System.out.println("dependents: " +
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c.getNumberOfDependents());
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c.thenApplyAsync(i -> i / 2);
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System.out.println("dependents: " +
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c.getNumberOfDependents());
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}
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}
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/* Output:
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1
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runAsync
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thenRunAsync
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runAsync is static
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99
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thenAcceptAsync: 4
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47
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105
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111
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8
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9
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cancelled: true
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completed exceptionally: true
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done: true
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java.util.concurrent.CompletableFuture@6d311334[Completed
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exceptionally]
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777
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dependents: 1
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dependents: 2
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*/
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