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FroussiosFroussios
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Examples 4.3 Coincidence
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‎tests/java/itrx/chapter4/coincidence/GroupJoinTest.java‎

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package itrx.chapter4.coincidence;
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import java.util.Arrays;
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import java.util.concurrent.TimeUnit;
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import org.junit.Test;
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import rx.Observable;
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import rx.observers.TestSubscriber;
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import rx.schedulers.Schedulers;
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import rx.schedulers.TestScheduler;
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public class GroupJoinTest {
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private static class Tuple<T1, T2> {
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public final T1 item1;
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public final T2 item2;
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public Tuple(T1 item1, T2 item2) {
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this.item1 = item1;
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this.item2 = item2;
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}
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public static <T1,T2> Tuple<T1,T2> create(T1 item1, T2 item2) {
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return new Tuple<T1,T2>(item1, item2);
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}
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof Tuple<?,?>) {
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Tuple<?,?> other = (Tuple<?,?>) obj;
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return this.item1.equals(other.item1) &&
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this.item2.equals(other.item2);
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}
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return false;
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}
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@Override
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public String toString() {
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return "(" + item1 + ", " + item2 + ")";
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}
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}
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public void example() {
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Observable<String> left =
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Observable.interval(100, TimeUnit.MILLISECONDS)
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.map(i -> "L" + i)
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.take(6);
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Observable<String> right =
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Observable.interval(200, TimeUnit.MILLISECONDS)
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.map(i -> "R" + i)
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.take(3);
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left
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.groupJoin(
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right,
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i -> Observable.never(),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS),
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(l, rs) -> rs.toList().subscribe(list -> System.out.println(l + ": " + list))
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)
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.subscribe();
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// L0: [R0, R1, R2]
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// L1: [R0, R1, R2]
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// L2: [R1, R2]
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// L3: [R1, R2]
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// L4: [R2]
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// L5: [R2]
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}
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//
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// Test
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//
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@Test
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public void test() {
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TestSubscriber<Object> tester = new TestSubscriber<>();
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TestScheduler scheduler = Schedulers.test();
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Observable<Long> left =
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Observable.interval(100, TimeUnit.MILLISECONDS, scheduler)
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.take(6);
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Observable<Long> right =
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Observable.interval(200, TimeUnit.MILLISECONDS, scheduler)
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.take(3);
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left
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.groupJoin(
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right,
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i -> Observable.never(),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS, scheduler),
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(l, rs) -> rs.toList().map(rl -> Tuple.create(l, rl))
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)
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.flatMap(i -> i)
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.subscribe(tester);
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scheduler.advanceTimeTo(600, TimeUnit.MILLISECONDS);
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tester.assertReceivedOnNext(Arrays.asList(
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Tuple.create(0L, Arrays.asList(0L, 1L, 2L)),
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Tuple.create(1L, Arrays.asList(0L, 1L, 2L)),
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Tuple.create(2L, Arrays.asList(1L, 2L)),
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Tuple.create(3L, Arrays.asList(1L, 2L)),
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Tuple.create(4L, Arrays.asList(2L)),
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Tuple.create(5L, Arrays.asList(2L))
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));
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}
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@Test
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public void exampleEquivalence() {
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TestScheduler scheduler = Schedulers.test();
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TestSubscriber<Object> testerJoin = new TestSubscriber<>();
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TestSubscriber<Object> testerGroupJoin = new TestSubscriber<>();
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Observable<Long> left =
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Observable.interval(100, TimeUnit.MILLISECONDS, scheduler);
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Observable<Long> right =
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Observable.interval(100, TimeUnit.MILLISECONDS, scheduler);
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left.join(
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right,
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i -> Observable.timer(150, TimeUnit.MILLISECONDS, scheduler),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS, scheduler),
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(l,r) -> Tuple.create(l, r)
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)
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.take(10)
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.subscribe(testerJoin);
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left.groupJoin(
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right,
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i -> Observable.timer(150, TimeUnit.MILLISECONDS, scheduler),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS, scheduler),
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(l, rs) -> rs.map(r -> Tuple.create(l, r))
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)
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.flatMap(i -> i)
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.take(10)
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.subscribe(testerGroupJoin);
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scheduler.advanceTimeTo(600, TimeUnit.MILLISECONDS);
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testerJoin.assertReceivedOnNext(testerGroupJoin.getOnNextEvents());
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}
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}

‎tests/java/itrx/chapter4/coincidence/JoinTest.java‎

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package itrx.chapter4.coincidence;
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import java.util.Arrays;
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import java.util.concurrent.TimeUnit;
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import org.junit.Test;
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import rx.Observable;
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import rx.observers.TestSubscriber;
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import rx.schedulers.Schedulers;
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import rx.schedulers.TestScheduler;
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public class JoinTest {
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private static class Tuple<T1, T2> {
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public final T1 item1;
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public final T2 item2;
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public Tuple(T1 item1, T2 item2) {
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this.item1 = item1;
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this.item2 = item2;
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}
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public static <T1,T2> Tuple<T1,T2> create(T1 item1, T2 item2) {
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return new Tuple<T1,T2>(item1, item2);
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}
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof Tuple<?,?>) {
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Tuple<?,?> other = (Tuple<?,?>) obj;
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return this.item1.equals(other.item1) &&
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this.item2.equals(other.item2);
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}
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return false;
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}
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}
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public void exampleJoinSimple() {
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Observable<String> left =
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Observable.interval(100, TimeUnit.MILLISECONDS)
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.map(i -> "L" + i);
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Observable<String> right =
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Observable.interval(200, TimeUnit.MILLISECONDS)
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.map(i -> "R" + i);
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left
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.join(
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right,
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i -> Observable.never(),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS),
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(l,r) -> l + " - " + r
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)
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.take(10)
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.subscribe(System.out::println);
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// L0 - R0
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// L1 - R0
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// L0 - R1
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// L1 - R1
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// L2 - R1
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// L3 - R1
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// L0 - R2
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// L1 - R2
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// L2 - R2
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// L3 - R2
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}
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public void exampleJoin2Way() {
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Observable<String> left =
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Observable.interval(100, TimeUnit.MILLISECONDS)
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.map(i -> "L" + i);
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Observable<String> right =
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Observable.interval(100, TimeUnit.MILLISECONDS)
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.map(i -> "R" + i);
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left
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.join(
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right,
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i -> Observable.timer(150, TimeUnit.MILLISECONDS),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS),
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(l,r) -> l + " - " + r
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)
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.take(10)
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.subscribe(System.out::println);
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// L0 - R0
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// L0 - R1
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// L1 - R1
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// L1 - R2
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// L2 - R2
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// L2 - R3
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// L3 - R3
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// L3 - R4
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// L4 - R4
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// L4 - R5
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}
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//
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// Tests
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//
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@Test
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public void testJoinSimple() {
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TestSubscriber<Tuple<Long,Long>> tester = new TestSubscriber<>();
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TestScheduler scheduler = Schedulers.test();
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Observable<Long> left =
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Observable.interval(100, TimeUnit.MILLISECONDS, scheduler);
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Observable<Long> right =
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Observable.interval(200, TimeUnit.MILLISECONDS, scheduler);
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left
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.join(
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right,
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i -> Observable.never(),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS, scheduler),
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(l,r) -> Tuple.create(l, r)
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)
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.take(10)
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.subscribe(tester);
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scheduler.advanceTimeTo(1000, TimeUnit.MILLISECONDS);
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tester.assertReceivedOnNext(Arrays.asList(
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Tuple.create(0L, 0L),
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Tuple.create(1L, 0L),
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Tuple.create(0L, 1L),
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Tuple.create(1L, 1L),
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Tuple.create(2L, 1L),
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Tuple.create(3L, 1L),
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Tuple.create(0L, 2L),
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Tuple.create(1L, 2L),
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Tuple.create(2L, 2L),
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Tuple.create(3L, 2L)
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));
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}
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@Test
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public void testJoin2Way() {
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TestSubscriber<Tuple<Long,Long>> tester = new TestSubscriber<>();
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TestScheduler scheduler = Schedulers.test();
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Observable<Long> left =
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Observable.interval(100, TimeUnit.MILLISECONDS, scheduler);
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Observable<Long> right =
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Observable.interval(100, TimeUnit.MILLISECONDS, scheduler);
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left
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.join(
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right,
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i -> Observable.timer(150, TimeUnit.MILLISECONDS, scheduler),
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i -> Observable.timer(0, TimeUnit.MILLISECONDS, scheduler),
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(l,r) -> Tuple.create(l, r)
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)
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.take(10)
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.subscribe(tester);
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scheduler.advanceTimeTo(1000, TimeUnit.MILLISECONDS);
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tester.assertReceivedOnNext(Arrays.asList(
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Tuple.create(0L, 0L),
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Tuple.create(0L, 1L),
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Tuple.create(1L, 1L),
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Tuple.create(1L, 2L),
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Tuple.create(2L, 2L),
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Tuple.create(2L, 3L),
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Tuple.create(3L, 3L),
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Tuple.create(3L, 4L),
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Tuple.create(4L, 4L),
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Tuple.create(4L, 5L)
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));
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}
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}

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