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DATAMONGO-2089 - Add fluent change stream API to ReactiveMongoTemplate. #751

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christophstrobl
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We now offer a fluent API for more intuitive change stream interaction.

Flux<ChangeStreamEvent<User>> flux = reactiveTemplate.changeStream()
    .watchCollection("persons")
    .filter(where("age").gte(38))
    .as(User.class)
    .listen();

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Let's also add Kotlin extensions for reified generics and for the as -> asType method.

*
* @return new instance of {@link ReactiveFind}. Never {@literal null}.
*/
ReactiveChangeStream<Document> changeStream();
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Should we drop this method in favor of changeStream(Document.class)?

* @see ChangeStreamOptionsBuilder#resumeAt(BsonTimestamp)
* @throws IllegalArgumentException if the given beacon is neither {@link Instant} nor {@link BsonTimestamp}.
*/
TerminatingChangeStream<T> resumeAt(Object beacon);
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Nit: token, not beacon.

* Consider limiting events be defining a {@link ChangeStreamWithCollection#watchCollection(String) collection} and/or
* {@link ChangeStreamWithFilter#filter(CriteriaDefinition) filter}.
*
* @return new instance of {@link ReactiveFind}. Never {@literal null}.
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Nit: ReactiveChangeStream instead of ReactiveFind.

/**
* Result type override (optional).
*/
interface ChangeStreamWithProjection<T> extends ChangeStreamWithFilter<T> {
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Probably we should inline this interface into ChangeStreamWithFilter. ChangeStreamWithFilter.filter returns ChangeStreamWithProjection and as(…) returns ChangeStreamWithFilter.

We now offer a fluent API for more intuitive change stream interaction.

Flux<ChangeStreamEvent<User>> flux = reactiveTemplate.changeStream()
    .watchCollection("persons")
    .filter(where("age").gte(38))
    .as(User.class)
    .listen();
mp911de pushed a commit that referenced this pull request Jul 3, 2019
We now offer a fluent API for more intuitive change stream interaction.

Flux<ChangeStreamEvent<User>> flux = reactiveTemplate.changeStream(User.class)
    .watchCollection("people")
    .filter(where("age").gte(38))
    .listen();

Original pull request: #751.
mp911de added a commit that referenced this pull request Jul 3, 2019
Add watchCollection(…) accepting an entity class. Use static import for assertions. Tweak javadoc.

Original pull request: #751.
@mp911de
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mp911de commented Jul 3, 2019

That's merged and polished now.

@mp911de mp911de closed this Jul 3, 2019
@mp911de mp911de deleted the issue/DATAMONGO-2089 branch July 3, 2019 09:25
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2 participants