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Adding eager concats to Single #5976

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merged 7 commits into from
Apr 29, 2018
Merged

Adding eager concats to Single #5976

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2d15e07
Adding eager concats to Single
Desislav-Petrov Apr 28, 2018
210b224
Removing unnecessary class - the utility already exists
Desislav-Petrov Apr 28, 2018
3eeab3c
Covering publisher sequence
Desislav-Petrov Apr 28, 2018
66a8c3b
Correcting javadoc
Desislav-Petrov Apr 28, 2018
1625f62
Correcting javadoc
Desislav-Petrov Apr 28, 2018
4e27c83
Fixing javadoc "Single sources" -> "SingleSources"
Desislav-Petrov Apr 28, 2018
0fc54dd
Fixing javadoc "Maybe sources" -> "MaybeSources"
Desislav-Petrov Apr 28, 2018
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6 changes: 3 additions & 3 deletions src/main/java/io/reactivex/Maybe.java
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@
public abstract class Maybe<T> implements MaybeSource<T> {

/**
* Runs multiple Maybe sources and signals the events of the first one that signals (cancelling
* Runs multiple MaybeSources and signals the events of the first one that signals (cancelling
* the rest).
* <dl>
* <dt><b>Scheduler:</b></dt>
Expand All @@ -68,7 +68,7 @@ public static <T> Maybe<T> amb(final Iterable<? extends MaybeSource<? extends T>
}

/**
* Runs multiple Maybe sources and signals the events of the first one that signals (cancelling
* Runs multiple MaybeSources and signals the events of the first one that signals (cancelling
* the rest).
* <dl>
* <dt><b>Scheduler:</b></dt>
Expand Down Expand Up @@ -412,7 +412,7 @@ public static <T> Flowable<T> concatEager(Iterable<? extends MaybeSource<? exten
}

/**
* Concatenates a Publisher sequence of Publishers eagerly into a single stream of values.
* Concatenates a Publisher sequence of MaybeSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* emitted source Publishers as they are observed. The operator buffers the values emitted by these
Expand Down
88 changes: 81 additions & 7 deletions src/main/java/io/reactivex/Single.java
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@
public abstract class Single<T> implements SingleSource<T> {

/**
* Runs multiple Single sources and signals the events of the first one that signals (cancelling
* Runs multiple SingleSources and signals the events of the first one that signals (cancelling
* the rest).
* <dl>
* <dt><b>Scheduler:</b></dt>
Expand All @@ -80,7 +80,7 @@ public static <T> Single<T> amb(final Iterable<? extends SingleSource<? extends
}

/**
* Runs multiple Single sources and signals the events of the first one that signals (cancelling
* Runs multiple SingleSources and signals the events of the first one that signals (cancelling
* the rest).
* <dl>
* <dt><b>Scheduler:</b></dt>
Expand All @@ -106,7 +106,7 @@ public static <T> Single<T> ambArray(final SingleSource<? extends T>... sources)
}

/**
* Concatenate the single values, in a non-overlapping fashion, of the Single sources provided by
* Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by
* an Iterable sequence.
* <dl>
* <dt><b>Backpressure:</b></dt>
Expand All @@ -127,7 +127,7 @@ public static <T> Flowable<T> concat(Iterable<? extends SingleSource<? extends T
}

/**
* Concatenate the single values, in a non-overlapping fashion, of the Single sources provided by
* Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by
* an Observable sequence.
* <dl>
* <dt><b>Scheduler:</b></dt>
Expand All @@ -147,7 +147,7 @@ public static <T> Observable<T> concat(ObservableSource<? extends SingleSource<?
}

/**
* Concatenate the single values, in a non-overlapping fashion, of the Single sources provided by
* Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by
* a Publisher sequence.
* <dl>
* <dt><b>Backpressure:</b></dt>
Expand All @@ -169,7 +169,7 @@ public static <T> Flowable<T> concat(Publisher<? extends SingleSource<? extends
}

/**
* Concatenate the single values, in a non-overlapping fashion, of the Single sources provided by
* Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by
* a Publisher sequence and prefetched by the specified amount.
* <dl>
* <dt><b>Backpressure:</b></dt>
Expand Down Expand Up @@ -299,7 +299,7 @@ public static <T> Flowable<T> concat(
}

/**
* Concatenate the single values, in a non-overlapping fashion, of the Single sources provided in
* Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided in
* an array.
* <dl>
* <dt><b>Backpressure:</b></dt>
Expand All @@ -320,6 +320,80 @@ public static <T> Flowable<T> concatArray(SingleSource<? extends T>... sources)
return RxJavaPlugins.onAssembly(new FlowableConcatMap(Flowable.fromArray(sources), SingleInternalHelper.toFlowable(), 2, ErrorMode.BOUNDARY));
}

/**
* Concatenates a sequence of SingleSource eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source SingleSources. The operator buffers the value emitted by these SingleSources and then drains them
* in order, each one after the previous one completes.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The operator honors backpressure from downstream.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of Single that need to be eagerly concatenated
* @return the new Flowable instance with the specified concatenation behavior
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@BackpressureSupport(BackpressureKind.FULL)
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Flowable<T> concatArrayEager(SingleSource<? extends T>... sources) {
return Flowable.fromArray(sources).concatMapEager(SingleInternalHelper.<T>toFlowable());
}

/**
* Concatenates a Publisher sequence of SingleSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* emitted source Publishers as they are observed. The operator buffers the values emitted by these
* Publishers and then drains them in order, each one after the previous one completes.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>Backpressure is honored towards the downstream and the outer Publisher is
* expected to support backpressure. Violating this assumption, the operator will
* signal {@link io.reactivex.exceptions.MissingBackpressureException}.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of Publishers that need to be eagerly concatenated
* @return the new Publisher instance with the specified concatenation behavior
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@BackpressureSupport(BackpressureKind.FULL)
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Flowable<T> concatEager(Publisher<? extends SingleSource<? extends T>> sources) {
return Flowable.fromPublisher(sources).concatMapEager(SingleInternalHelper.<T>toFlowable());
}

/**
* Concatenates a sequence of SingleSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source SingleSources. The operator buffers the values emitted by these SingleSources and then drains them
* in order, each one after the previous one completes.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>Backpressure is honored towards the downstream.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of SingleSource that need to be eagerly concatenated
* @return the new Flowable instance with the specified concatenation behavior
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@BackpressureSupport(BackpressureKind.FULL)
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Flowable<T> concatEager(Iterable<? extends SingleSource<? extends T>> sources) {
return Flowable.fromIterable(sources).concatMapEager(SingleInternalHelper.<T>toFlowable());
}

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There is another overload you missed:

public static <T> Flowable<T> concatEager(Publisher<? extends SingleSource<? extends T>> sources)

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Oops - thanks for the review, will update shortly

/**
* Provides an API (via a cold Completable) that bridges the reactive world with the callback-style world.
* <p>
Expand Down
60 changes: 60 additions & 0 deletions src/test/java/io/reactivex/internal/operators/single/SingleConcatTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,12 @@
package io.reactivex.internal.operators.single;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.Arrays;

import io.reactivex.processors.PublishProcessor;
import io.reactivex.subscribers.TestSubscriber;
import org.junit.Test;

import io.reactivex.*;
Expand Down Expand Up @@ -67,6 +70,63 @@ public void concatArray() {
}
}

@SuppressWarnings("unchecked")
@Test
public void concatArrayEagerTest() {
PublishProcessor<String> pp1 = PublishProcessor.create();
PublishProcessor<String> pp2 = PublishProcessor.create();

TestSubscriber<String> ts = Single.concatArrayEager(pp1.single("1"), pp2.single("2")).test();

assertTrue(pp1.hasSubscribers());
assertTrue(pp2.hasSubscribers());

pp2.onComplete();
ts.assertEmpty();
pp1.onComplete();

ts.assertResult("1", "2");
ts.assertComplete();
}

@SuppressWarnings("unchecked")
@Test
public void concatEagerIterableTest() {
PublishProcessor<String> pp1 = PublishProcessor.create();
PublishProcessor<String> pp2 = PublishProcessor.create();

TestSubscriber<String> ts = Single.concatEager(Arrays.asList(pp1.single("2"), pp2.single("1"))).test();

assertTrue(pp1.hasSubscribers());
assertTrue(pp2.hasSubscribers());

pp2.onComplete();
ts.assertEmpty();
pp1.onComplete();

ts.assertResult("2", "1");
ts.assertComplete();
}

@SuppressWarnings("unchecked")
@Test
public void concatEagerPublisherTest() {
PublishProcessor<String> pp1 = PublishProcessor.create();
PublishProcessor<String> pp2 = PublishProcessor.create();

TestSubscriber<String> ts = Single.concatEager(Flowable.just(pp1.single("1"), pp2.single("2"))).test();

assertTrue(pp1.hasSubscribers());
assertTrue(pp2.hasSubscribers());

pp2.onComplete();
ts.assertEmpty();
pp1.onComplete();

ts.assertResult("1", "2");
ts.assertComplete();
}

@SuppressWarnings("unchecked")
@Test
public void concatObservable() {
Expand Down