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1.x: Implements BlockingSingle #3286

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merged 1 commit into from Nov 11, 2015
Merged

1.x: Implements BlockingSingle #3286

merged 1 commit into from Nov 11, 2015

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hyleung
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@hyleung hyleung commented Sep 2, 2015

Adds BlockingSingle (issue #3252), the blocking version of rx.Single.

BlockingSingle has the following methods:

  • from(Single) -- factory method for creating a BlockingSingle from a
    Single
  • value() -- returns the value emitted from the Single
  • toFuture() -- returns a java.util.concurrent.Future

Couldn't actually think of any other useful operations to perform on BlockingSingle - in comparison to BlockingObservable, there's not much to this class (at the moment).

hyleung
hyleung reviewed Sep 2, 2015
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src/test/java/rx/observables/BlockingSingleTest.java
}


private static class ThrowableWithCause extends BaseMatcher<Throwable> {
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Sorry, this is gross - what I wanted to do was (in testSingleErrorChecked()) use exception.expectCause(...) from Junit 4.11, but didn't want to touch the version of that library (I tried, to upgrade, but there are a half a dozen failures in the test suite that occur).

Could get rewrite the test to try/catch and to the assertion on the caught exception, I suppose.

@hyleung
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hyleung commented Sep 2, 2015

Hmmm...got a test failure that I can't reproduce locally: (fixed by #3285)

rx.observables.SyncOnSubscribeTest > testSubscribeOn FAILED
    java.lang.AssertionError: expected:<4> but was:<3>
        at org.junit.Assert.fail(Assert.java:93)
        at org.junit.Assert.failNotEquals(Assert.java:647)
        at org.junit.Assert.assertEquals(Assert.java:128)
        at org.junit.Assert.assertEquals(Assert.java:472)
        at org.junit.Assert.assertEquals(Assert.java:456)
        at rx.observables.SyncOnSubscribeTest.testSubscribeOn(SyncOnSubscribeTest.java:734

@akarnokd akarnokd mentioned this pull request Sep 2, 2015
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@stealthcode
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This test failure should be resolved now.

@artem-zinnatullin artem-zinnatullin mentioned this pull request Oct 8, 2015
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@abersnaze
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@hyleung is this ready to be reviewed/merged?

@hyleung
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hyleung commented Oct 9, 2015

@abersnaze Not quite yet. There are a couple of things from @artem-zinnatullin's PR (#3416) that I want to pull in (splitting out a separate BlockingUtils class to hold awaitComplete, for example) Also, I'm going to rebase it against head of 1.x since it's been about a month...

@hyleung hyleung changed the title Implements BlockingSingle 1.x: Implements BlockingSingle Oct 9, 2015
hyleung
hyleung reviewed Oct 9, 2015
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src/main/java/rx/observables/BlockingSingle.java
* @return a {@link Future} that returns the value
*/
public Future<T> toFuture() {
return BlockingOperatorToFuture.toFuture(single.toObservable());
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Is this "appropriate"? Could add BlockingOperatorToFuture.toFuture(Single) - wonder if it would/should behave any differently.

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hyleung commented Oct 10, 2015

@abersnaze the PR is ready for review, btw. I'll keep the commits separate as I incorporate the feedback and squash it down at the end.

artem-zinnatullin
artem-zinnatullin reviewed Oct 10, 2015
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src/main/java/rx/Single.java
@@ -1801,6 +1802,10 @@ public void onNext(T t) {
return lift(new OperatorTimeout<T>(timeout, timeUnit, asObservable(other), scheduler));
}

public final BlockingSingle<T> toBlocking() {
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Javadoc + @Experimental, you can grab javadoc from my PR.

@artem-zinnatullin
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Maybe move BlockingSingle from rx.observables to rx.singles?

@hyleung
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hyleung commented Oct 10, 2015

@artem-zinnatullin re. rx.singles - that would be a new package then? Don't have a particular option either way, tbh - anybody else? Ah, I see what you're getting at....moved to rx.singles. Which other operators are you thinking of adding to Single, btw?

artem-zinnatullin
artem-zinnatullin reviewed Oct 10, 2015
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src/test/java/rx/internal/util/BlockingUtilsTest.java
import rx.schedulers.Schedulers;

/**
* Created with IntelliJ IDEA.
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Remove this header please, we have git history :)

artem-zinnatullin
artem-zinnatullin reviewed Oct 10, 2015
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src/test/java/rx/observables/BlockingSingleTest.java
blockingSingle.value();
fail("Expecting an exception to be thrown");
} catch (Exception caughtException) {
assertNotNull(caughtException);
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It's impossible :) You can remove this check.

@artem-zinnatullin
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LGTM, just a few nits left 👍

@hyleung hyleung force-pushed the blocking-single branch 3 times, most recently from 89fcbfb to d80d70a Compare October 15, 2015 04:33
stealthcode
stealthcode reviewed Nov 10, 2015
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src/main/java/rx/singles/BlockingSingle.java
*
* @return the value emitted by this {@code BlockingSingle}
*/
public T value() {
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Please add @Experimental to public methods.

@stealthcode
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I'm ready to merge this as long as we can add the necessary @Experimental annotations and rebase onto 1.x.

@hyleung
Implements BlockingSingle
d55cd40 
This commit adds BlockingSingle, the blocking version of rx.Single.

BlockingSingle has the following methods:

i `from(Single)` -- factory method for creating a `BlockingSingle` from a
`Single`
- `get()` -- returns the value emitted from the Single
- `get(Func1<T,Boolean> predicate)` -- returns the value if it matches
  the provided predicate
- `toFuture()` -- returns a `java.util.concurrent.Future`

Adds Single.toBlocking
@hyleung
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hyleung commented Nov 11, 2015

@stealthcode done!

@artem-zinnatullin
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👍

@akarnokd
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👍

Thanks for contributing.

akarnokd added a commit that referenced this pull request Nov 11, 2015
@akarnokd
Merge pull request #3286 from hyleung/blocking-single
4b29429 
1.x: Implements BlockingSingle
@akarnokd akarnokd merged commit 4b29429 into ReactiveX:1.x Nov 11, 2015
@hyleung hyleung deleted the blocking-single branch November 12, 2015 05:28
@hyleung hyleung mentioned this pull request Nov 12, 2015
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@DavidMGross DavidMGross mentioned this pull request Dec 2, 2015
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@hyleung @stealthcode @abersnaze @artem-zinnatullin @akarnokd