2016-12-21 11:06:49 -08:00
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// concurrent/CompletablePizza.java
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// (c)2016 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.*;
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import java.util.concurrent.*;
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import java.util.stream.*;
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import onjava.Timer;
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public class CompletablePizza {
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static int QUANTITY = 5;
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public static CompletableFuture<Pizza>
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makeCF(Pizza za) {
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return CompletableFuture
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.completedFuture(za)
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.thenApplyAsync(Pizza::roll)
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.thenApplyAsync(Pizza::sauce)
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.thenApplyAsync(Pizza::cheese)
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.thenApplyAsync(Pizza::toppings)
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.thenApplyAsync(Pizza::bake)
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.thenApplyAsync(Pizza::slice)
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.thenApplyAsync(Pizza::box);
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}
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public static void
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show(CompletableFuture<Pizza> cf) {
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try {
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System.out.println(cf.get());
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} catch(Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static void main(String[] args) {
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Timer timer = new Timer();
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List<CompletableFuture<Pizza>> pizzas =
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IntStream.range(0, QUANTITY)
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.mapToObj(Pizza::new)
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.map(CompletablePizza::makeCF)
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.collect(Collectors.toList());
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System.out.println(timer.duration());
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pizzas.forEach(CompletablePizza::show);
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System.out.println(timer.duration());
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}
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}
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/* Output:
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2016-12-25 12:36:49 -08:00
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56
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Pizza 0: ROLLED
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Pizza 1: ROLLED
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Pizza 4: ROLLED
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Pizza 2: ROLLED
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Pizza 3: ROLLED
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Pizza 0: SAUCED
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Pizza 3: SAUCED
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Pizza 2: SAUCED
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Pizza 4: SAUCED
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Pizza 1: SAUCED
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Pizza 0: CHEESED
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Pizza 4: CHEESED
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Pizza 2: CHEESED
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Pizza 3: CHEESED
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Pizza 1: CHEESED
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Pizza 0: TOPPED
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Pizza 4: TOPPED
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Pizza 1: TOPPED
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Pizza 3: TOPPED
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Pizza 2: TOPPED
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Pizza 0: BAKED
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Pizza 4: BAKED
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Pizza 3: BAKED
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Pizza 1: BAKED
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Pizza 2: BAKED
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Pizza 0: SLICED
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Pizza 2: SLICED
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Pizza 4: SLICED
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Pizza 1: SLICED
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Pizza 3: SLICED
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Pizza 0: BOXED
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Pizza0: complete
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Pizza 4: BOXED
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Pizza 3: BOXED
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Pizza 2: BOXED
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Pizza 1: BOXED
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Pizza1: complete
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Pizza2: complete
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Pizza3: complete
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Pizza4: complete
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1659
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2016-12-21 11:06:49 -08:00
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*/
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