Package rx.observables

Class GroupedObservable<K,T>

java.lang.Object

rx.Observable<T>

rx.observables.GroupedObservable<K,T>

Type Parameters:

K - the type of the key

T - the type of the items emitted by the GroupedObservable

Direct Known Subclasses:

OperatorGroupBy.GroupedUnicast

public class GroupedObservable<K,T>
extends Observable<T>

An Observable that has been grouped by key, the value of which can be obtained with getKey().

Note: A GroupedObservable will cache the items it is to emit until such time as it is subscribed to. For this reason, in order to avoid memory leaks, you should not simply ignore those GroupedObservables that do not concern you. Instead, you can signal to them that they may discard their buffers by applying an operator like take(0) to them.

See Also:

• Observable.groupBy(Func1)
• ReactiveX documentation: GroupBy

Nested Class Summary

Nested classes/interfaces inherited from class rx.Observable

Observable.OnSubscribe<T>, Observable.Operator<R,T>, Observable.Transformer<T,R>

Field Summary

Fields

Modifier and Type	Field	Description
private final K	key

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	GroupedObservable(K key, Observable.OnSubscribe<T> onSubscribe)

Method Summary

Modifier and Type	Method	Description
static <K, T> GroupedObservable<K,T>	create(K key, Observable.OnSubscribe<T> f)	Returns an Observable that will execute the specified function when a Subscriber subscribes to it.
static <K, T> GroupedObservable<K,T>	from(K key, Observable<T> o)	Converts an Observable into a GroupedObservable with a particular key.
K	getKey()	Returns the key that identifies the group of items emitted by this GroupedObservable

Methods inherited from class rx.Observable

all, amb, amb, amb, amb, amb, amb, amb, amb, amb, ambWith, asObservable, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, cache, cache, cacheWithInitialCapacity, cast, collect, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatestDelayError, compose, concat, concat, concat, concat, concat, concat, concat, concat, concat, concatDelayError, concatDelayError, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatMap, concatMapDelayError, concatMapEager, concatMapEager, concatMapEager, concatMapIterable, concatWith, contains, count, countLong, create, create, create, debounce, debounce, debounce, defaultIfEmpty, defer, delay, delay, delay, delay, delaySubscription, delaySubscription, delaySubscription, delaySubscription, dematerialize, distinct, distinct, distinctUntilChanged, distinctUntilChanged, distinctUntilChanged, doAfterTerminate, doOnCompleted, doOnEach, doOnEach, doOnError, doOnNext, doOnRequest, doOnSubscribe, doOnTerminate, doOnUnsubscribe, elementAt, elementAtOrDefault, empty, error, exists, extend, filter, finallyDo, first, first, firstOrDefault, firstOrDefault, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMapIterable, flatMapIterable, flatMapIterable, flatMapIterable, forEach, forEach, forEach, from, from, from, from, from, fromAsync, fromCallable, groupBy, groupBy, groupBy, groupJoin, ignoreElements, interval, interval, interval, interval, isEmpty, join, just, just, just, just, just, just, just, just, just, just, last, last, lastOrDefault, lastOrDefault, lift, limit, map, materialize, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeWith, nest, never, observeOn, observeOn, observeOn, observeOn, ofType, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureDrop, onBackpressureDrop, onBackpressureLatest, onErrorResumeNext, onErrorResumeNext, onErrorReturn, onExceptionResumeNext, onTerminateDetach, publish, publish, range, range, rebatchRequests, reduce, reduce, repeat, repeat, repeat, repeat, repeatWhen, repeatWhen, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, retry, retry, retry, retryWhen, retryWhen, sample, sample, sample, scan, scan, sequenceEqual, sequenceEqual, serialize, share, single, single, singleOrDefault, singleOrDefault, skip, skip, skip, skipLast, skipLast, skipLast, skipUntil, skipWhile, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, subscribe, subscribe, subscribe, subscribe, subscribe, subscribe, subscribeOn, switchIfEmpty, switchMap, switchMapDelayError, switchOnNext, switchOnNextDelayError, take, take, take, takeFirst, takeLast, takeLast, takeLast, takeLast, takeLast, takeLastBuffer, takeLastBuffer, takeLastBuffer, takeLastBuffer, takeLastBuffer, takeUntil, takeUntil, takeWhile, throttleFirst, throttleFirst, throttleLast, throttleLast, throttleWithTimeout, throttleWithTimeout, timeInterval, timeInterval, timeout, timeout, timeout, timeout, timeout, timeout, timeout, timeout, timer, timer, timer, timer, timestamp, timestamp, toBlocking, toCompletable, toList, toMap, toMap, toMap, toMultimap, toMultimap, toMultimap, toMultimap, toSingle, toSortedList, toSortedList, toSortedList, toSortedList, unsafeSubscribe, unsubscribeOn, using, using, window, window, window, window, window, window, window, window, window, window, window, window, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zipWith, zipWith

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

key

private final K key

Constructor Details

GroupedObservable

protected GroupedObservable(K key,
 Observable.OnSubscribe<T> onSubscribe)

Method Details

from

public static <K,
T> GroupedObservable<K,T> from(K key,
 Observable<T> o)

Converts an Observable into a GroupedObservable with a particular key.

Type Parameters:

K - the key type

T - the value type

Parameters:

key - the key to identify the group of items emitted by this GroupedObservable

o - the Observable to convert

Returns:

a GroupedObservable representation of o, with key key

create

public static <K,
T> GroupedObservable<K,T> create(K key,
 Observable.OnSubscribe<T> f)

Returns an Observable that will execute the specified function when a Subscriber subscribes to it.

Write the function you pass to create so that it behaves as an Observable: It should invoke the Subscriber's onNext, onError, and onCompleted methods appropriately.

A well-formed Observable must invoke either the Subscriber's onCompleted method exactly once or its onError method exactly once.

See Rx Design Guidelines (PDF) for detailed information.

Scheduler:

create does not operate by default on a particular Scheduler.

Type Parameters:

K - the type of the key

T - the type of the items that this Observable emits

Parameters:

key - the key value

f - a function that accepts an Subscriber<T>, and invokes its onNext, onError, and onCompleted methods as appropriate

Returns:

a GroupedObservable that, when a Subscriber subscribes to it, will execute the specified function

getKey

public K getKey()

Returns the key that identifies the group of items emitted by this GroupedObservable

Returns:

the key that the items emitted by this GroupedObservable were grouped by