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update java8
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‎04fx/Java8inAction/.gitignore‎

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/ThinkingJava/ThinkingJava.iml
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/.idea
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*.class
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target/
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.jar
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*.war
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*.ear
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*

‎04fx/Java8inAction/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<groupId>io.kimmking</groupId>
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<version>1.0-SNAPSHOT</version>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>java8inaction</artifactId>
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<name>java8inaction</name>
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<properties>
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<maven.compiler.target>1.8</maven.compiler.target>
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<maven.compiler.source>1.8</maven.compiler.source>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-core</artifactId>
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<version>1.19</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-annprocess</artifactId>
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<version>1.19</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.13</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>${maven.compiler.source}</source>
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<target>${maven.compiler.target}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎04fx/Java8inAction/src/main/java/lambdasinaction/appa/Author.java‎

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package lambdasinaction.appa;
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import java.lang.annotation.Repeatable;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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@Repeatable(Authors.class)
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@Retention(RetentionPolicy.RUNTIME)
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public @interface Author {
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String name();
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}

‎04fx/Java8inAction/src/main/java/lambdasinaction/appa/Authors.java‎

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package lambdasinaction.appa;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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@Retention(RetentionPolicy.RUNTIME)
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public @interface Authors {
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Author[] value();
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}

‎04fx/Java8inAction/src/main/java/lambdasinaction/appa/Book.java‎

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package lambdasinaction.appa;
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import java.util.Arrays;
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@Author(name = "Raoul")
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@Author(name = "Mario")
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@Author(name = "Alan")
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public class Book {
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public static void main(String[] args) {
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Author[] authors = Book.class.getAnnotationsByType(Author.class);
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Arrays.asList(authors).stream().forEach(a -> {
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System.out.println(a.name());
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});
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}
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}

‎04fx/Java8inAction/src/main/java/lambdasinaction/appc/StreamForker.java‎

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package lambdasinaction.appc;
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.function.*;
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import java.util.stream.*;
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/**
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* Adapted from http://mail.openjdk.java.net/pipermail/lambda-dev/2013-November/011516.html
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*/
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public class StreamForker<T> {
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private final Stream<T> stream;
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private final Map<Object, Function<Stream<T>, ?>> forks = new HashMap<>();
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public StreamForker(Stream<T> stream) {
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this.stream = stream;
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}
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public StreamForker<T> fork(Object key, Function<Stream<T>, ?> f) {
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forks.put(key, f);
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return this;
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}
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public Results getResults() {
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ForkingStreamConsumer<T> consumer = build();
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try {
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stream.sequential().forEach(consumer);
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} finally {
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consumer.finish();
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}
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return consumer;
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}
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private ForkingStreamConsumer<T> build() {
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List<BlockingQueue<T>> queues = new ArrayList<>();
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Map<Object, Future<?>> actions =
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forks.entrySet().stream().reduce(
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new HashMap<Object, Future<?>>(),
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(map, e) -> {
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map.put(e.getKey(),
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getOperationResult(queues, e.getValue()));
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return map;
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},
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(m1, m2) -> {
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m1.putAll(m2);
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return m1;
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});
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return new ForkingStreamConsumer<>(queues, actions);
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}
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private Future<?> getOperationResult(List<BlockingQueue<T>> queues, Function<Stream<T>, ?> f) {
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BlockingQueue<T> queue = new LinkedBlockingQueue<>();
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queues.add(queue);
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Spliterator<T> spliterator = new BlockingQueueSpliterator<>(queue);
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Stream<T> source = StreamSupport.stream(spliterator, false);
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return CompletableFuture.supplyAsync( () -> f.apply(source) );
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}
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public static interface Results {
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public <R> R get(Object key);
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}
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private static class ForkingStreamConsumer<T> implements Consumer<T>, Results {
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static final Object END_OF_STREAM = new Object();
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private final List<BlockingQueue<T>> queues;
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private final Map<Object, Future<?>> actions;
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ForkingStreamConsumer(List<BlockingQueue<T>> queues, Map<Object, Future<?>> actions) {
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this.queues = queues;
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this.actions = actions;
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}
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@Override
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public void accept(T t) {
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queues.forEach(q -> q.add(t));
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}
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@Override
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public <R> R get(Object key) {
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try {
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return ((Future<R>) actions.get(key)).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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void finish() {
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accept((T) END_OF_STREAM);
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}
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}
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private static class BlockingQueueSpliterator<T> implements Spliterator<T> {
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private final BlockingQueue<T> q;
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BlockingQueueSpliterator(BlockingQueue<T> q) {
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this.q = q;
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}
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@Override
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public boolean tryAdvance(Consumer<? super T> action) {
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T t;
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while (true) {
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try {
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t = q.take();
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break;
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}
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catch (InterruptedException e) {
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}
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}
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if (t != ForkingStreamConsumer.END_OF_STREAM) {
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action.accept(t);
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return true;
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}
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return false;
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}
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@Override
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public Spliterator<T> trySplit() {
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return null;
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}
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@Override
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public long estimateSize() {
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return 0;
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}
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@Override
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public int characteristics() {
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return 0;
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}
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}
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}

‎04fx/Java8inAction/src/main/java/lambdasinaction/appc/StreamForkerExample.java‎

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package lambdasinaction.appc;
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import lambdasinaction.chap6.*;
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import static java.util.stream.Collectors.*;
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import static lambdasinaction.chap6.Dish.menu;
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import java.util.*;
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import java.util.stream.*;
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public class StreamForkerExample {
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public static void main(String[] args) throws Exception {
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processMenu();
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}
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private static void processMenu() {
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Stream<Dish> menuStream = menu.stream();
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StreamForker.Results results = new StreamForker<Dish>(menuStream)
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.fork("shortMenu", s -> s.map(Dish::getName).collect(joining(", ")))
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.fork("totalCalories", s -> s.mapToInt(Dish::getCalories).sum())
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.fork("mostCaloricDish", s -> s.reduce((d1, d2) -> d1.getCalories() > d2.getCalories() ? d1 : d2)
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.get())
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.fork("dishesByType", s -> s.collect(groupingBy(Dish::getType)))
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.getResults();
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String shortMeny = results.get("shortMenu");
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int totalCalories = results.get("totalCalories");
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Dish mostCaloricDish = results.get("mostCaloricDish");
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Map<Dish.Type, List<Dish>> dishesByType = results.get("dishesByType");
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System.out.println("Short menu: " + shortMeny);
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System.out.println("Total calories: " + totalCalories);
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System.out.println("Most caloric dish: " + mostCaloricDish);
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System.out.println("Dishes by type: " + dishesByType);
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}
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}

‎04fx/Java8inAction/src/main/java/lambdasinaction/appd/InnerClass.java‎

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package lambdasinaction.appd;
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import java.util.function.Function;
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public class InnerClass {
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Function<Object, String> f = new Function<Object, String>() {
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@Override
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public String apply(Object obj) {
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return obj.toString();
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}
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};
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}

‎04fx/Java8inAction/src/main/java/lambdasinaction/appd/Lambda.java‎

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package lambdasinaction.appd;
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import java.util.function.Function;
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public class Lambda {
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Function<Object, String> f = obj -> obj.toString();
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}

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