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Operator GroupJoin v2
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‎rxjava-core/src/main/java/rx/Observable.java

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import rx.operators.OperationFirstOrDefault;
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import rx.operators.OperationGroupBy;
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import rx.operators.OperationGroupByUntil;
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import rx.operators.OperationGroupJoin;
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import rx.operators.OperationInterval;
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import rx.operators.OperationJoin;
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import rx.operators.OperationJoinPatterns;
@@ -5099,6 +5100,27 @@ public <K> Observable<GroupedObservable<K, T>> groupBy(final Func1<? super T, ?
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return create(OperationGroupBy.groupBy(this, keySelector));
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}
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/**
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* Return an Observable which correlates two sequences when they overlap and groups the results.
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*
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* @param right the other Observable to correlate values of this observable to
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* @param leftDuration function that returns an Observable which indicates the duration of
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* the values of this Observable
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* @param rightDuration function that returns an Observable which indicates the duration of
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* the values of the right Observable
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* @param resultSelector function that takes a left value, the right observable and returns the
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* value to be emitted
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* @return an Observable that emits grouped values based on overlapping durations from this and
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* another Observable
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*
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* @see <a href="http://msdn.microsoft.com/en-us/library/hh244235.aspx">MSDN: Observable.GroupJoin</a>
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*/
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public <T2, D1, D2, R> Observable<R> groupJoin(Observable<T2> right, Func1<? super T, ? extends Observable<D1>> leftDuration,
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Func1<? super T2, ? extends Observable<D2>> rightDuration,
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Func2<? super T, ? super Observable<T2>, ? extends R> resultSelector) {
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return create(new OperationGroupJoin<T, T2, D1, D2, R>(this, right, leftDuration, rightDuration, resultSelector));
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}
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/**
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* Returns an {@link Observable} that emits <code>true</code> if the source
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* {@link Observable} is empty, otherwise <code>false</code>.

‎rxjava-core/src/main/java/rx/operators/OperationGroupJoin.java

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/**
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* Copyright 2013 Netflix, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package rx.operators;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import rx.Observable;
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import rx.Observable.OnSubscribeFunc;
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import rx.Observer;
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import rx.Subscription;
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import rx.subjects.PublishSubject;
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import rx.subjects.Subject;
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import rx.subscriptions.CompositeSubscription;
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import rx.subscriptions.RefCountSubscription;
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import rx.subscriptions.SerialSubscription;
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import rx.util.functions.Func1;
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import rx.util.functions.Func2;
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/**
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* Corrrelates two sequences when they overlap and groups the results.
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*
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* @see <a href="http://msdn.microsoft.com/en-us/library/hh244235.aspx">MSDN: Observable.GroupJoin</a>
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*/
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public class OperationGroupJoin<T1, T2, D1, D2, R> implements OnSubscribeFunc<R> {
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protected final Observable<T1> left;
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protected final Observable<T2> right;
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protected final Func1<? super T1, ? extends Observable<D1>> leftDuration;
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protected final Func1<? super T2, ? extends Observable<D2>> rightDuration;
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protected final Func2<? super T1, ? super Observable<T2>, ? extends R> resultSelector;
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public OperationGroupJoin(
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Observable<T1> left,
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Observable<T2> right,
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Func1<? super T1, ? extends Observable<D1>> leftDuration,
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Func1<? super T2, ? extends Observable<D2>> rightDuration,
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Func2<? super T1, ? super Observable<T2>, ? extends R> resultSelector
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) {
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this.left = left;
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this.right = right;
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this.leftDuration = leftDuration;
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this.rightDuration = rightDuration;
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this.resultSelector = resultSelector;
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}
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@Override
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public Subscription onSubscribe(Observer<? super R> t1) {
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ResultManager ro = new ResultManager(t1);
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ro.init();
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return ro;
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}
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/** Manages sub-observers and subscriptions. */
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class ResultManager implements Subscription {
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final RefCountSubscription cancel;
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final Observer<? super R> observer;
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final CompositeSubscription group;
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final Object guard = new Object();
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int leftIds;
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int rightIds;
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final Map<Integer, Observer<T2>> leftMap = new HashMap<Integer, Observer<T2>>();
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final Map<Integer, T2> rightMap = new HashMap<Integer, T2>();
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boolean leftDone;
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boolean rightDone;
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public ResultManager(Observer<? super R> observer) {
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this.observer = observer;
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this.group = new CompositeSubscription();
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this.cancel = new RefCountSubscription(group);
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}
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public void init() {
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SerialSubscription s1 = new SerialSubscription();
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SerialSubscription s2 = new SerialSubscription();
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group.add(s1);
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group.add(s2);
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s1.setSubscription(left.subscribe(new LeftObserver(s1)));
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s2.setSubscription(right.subscribe(new RightObserver(s2)));
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}
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@Override
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public void unsubscribe() {
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cancel.unsubscribe();
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}
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void groupsOnCompleted() {
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List<Observer<T2>> list = new ArrayList<Observer<T2>>(leftMap.values());
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leftMap.clear();
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rightMap.clear();
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for (Observer<T2> o : list) {
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o.onCompleted();
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}
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}
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/** Observe the left source. */
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class LeftObserver implements Observer<T1> {
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final Subscription tosource;
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public LeftObserver(Subscription tosource) {
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this.tosource = tosource;
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}
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@Override
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public void onNext(T1 args) {
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try {
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int id;
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Subject<T2, T2> subj = PublishSubject.create();
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synchronized (guard) {
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id = leftIds++;
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leftMap.put(id, subj);
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}
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Observable<T2> window = Observable.create(new WindowObservableFunc<T2>(subj, cancel));
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Observable<D1> duration = leftDuration.call(args);
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SerialSubscription sduration = new SerialSubscription();
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group.add(sduration);
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sduration.setSubscription(duration.subscribe(new LeftDurationObserver(id, sduration, subj)));
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R result = resultSelector.call(args, window);
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synchronized (guard) {
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observer.onNext(result);
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for (T2 t2 : rightMap.values()) {
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subj.onNext(t2);
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}
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}
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} catch (Throwable t) {
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onError(t);
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}
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}
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@Override
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public void onCompleted() {
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synchronized (guard) {
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leftDone = true;
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if (rightDone) {
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groupsOnCompleted();
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observer.onCompleted();
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cancel.unsubscribe();
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}
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}
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}
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@Override
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public void onError(Throwable e) {
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synchronized (guard) {
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for (Observer<T2> o : leftMap.values()) {
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o.onError(e);
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}
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observer.onError(e);
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cancel.unsubscribe();
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}
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}
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}
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/** Observe the right source. */
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class RightObserver implements Observer<T2> {
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final Subscription tosource;
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public RightObserver(Subscription tosource) {
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this.tosource = tosource;
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}
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@Override
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public void onNext(T2 args) {
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try {
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int id;
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synchronized (guard) {
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id = rightIds++;
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rightMap.put(id, args);
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}
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Observable<D2> duration = rightDuration.call(args);
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SerialSubscription sduration = new SerialSubscription();
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group.add(sduration);
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sduration.setSubscription(duration.subscribe(new RightDurationObserver(id, sduration)));
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synchronized (guard) {
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for (Observer<T2> o : leftMap.values()) {
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o.onNext(args);
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}
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}
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} catch (Throwable t) {
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onError(t);
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}
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}
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@Override
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public void onCompleted() {
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// tosource.unsubscribe();
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synchronized (guard) {
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rightDone = true;
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if (leftDone) {
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groupsOnCompleted();
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observer.onCompleted();
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cancel.unsubscribe();
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}
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}
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}
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@Override
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public void onError(Throwable e) {
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synchronized (guard) {
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for (Observer<T2> o : leftMap.values()) {
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o.onError(e);
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}
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observer.onError(e);
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cancel.unsubscribe();
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}
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}
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}
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/** Observe left duration and apply termination. */
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class LeftDurationObserver implements Observer<D1> {
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final int id;
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final Subscription sduration;
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final Observer<T2> gr;
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public LeftDurationObserver(int id, Subscription sduration, Observer<T2> gr) {
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this.id = id;
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this.sduration = sduration;
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this.gr = gr;
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}
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@Override
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public void onCompleted() {
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synchronized (guard) {
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if (leftMap.remove(id) != null) {
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gr.onCompleted();
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}
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}
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group.remove(sduration);
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}
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@Override
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public void onError(Throwable e) {
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synchronized (guard) {
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observer.onError(e);
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}
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cancel.unsubscribe();
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}
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@Override
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public void onNext(D1 args) {
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onCompleted();
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}
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}
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/** Observe right duration and apply termination. */
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class RightDurationObserver implements Observer<D2> {
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final int id;
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final Subscription sduration;
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public RightDurationObserver(int id, Subscription sduration) {
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this.id = id;
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this.sduration = sduration;
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}
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@Override
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public void onCompleted() {
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synchronized (guard) {
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rightMap.remove(id);
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}
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group.remove(sduration);
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}
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@Override
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public void onError(Throwable e) {
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synchronized (guard) {
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observer.onError(e);
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}
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cancel.unsubscribe();
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}
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@Override
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public void onNext(D2 args) {
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onCompleted();
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}
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}
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}
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/**
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* The reference-counted window observable.
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* Subscribes to the underlying Observable by using a reference-counted
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* subscription.
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*/
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static class WindowObservableFunc<T> implements OnSubscribeFunc<T> {
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final RefCountSubscription refCount;
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final Observable<T> underlying;
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public WindowObservableFunc(Observable<T> underlying, RefCountSubscription refCount) {
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this.refCount = refCount;
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this.underlying = underlying;
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}
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@Override
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public Subscription onSubscribe(Observer<? super T> t1) {
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CompositeSubscription cs = new CompositeSubscription();
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cs.add(refCount.getSubscription());
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WindowObserver wo = new WindowObserver(t1, cs);
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cs.add(underlying.subscribe(wo));
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return cs;
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}
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/** Observe activities on the window. */
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class WindowObserver implements Observer<T> {
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final Observer<? super T> observer;
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final Subscription self;
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public WindowObserver(Observer<? super T> observer, Subscription self) {
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this.observer = observer;
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this.self = self;
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}
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@Override
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public void onNext(T args) {
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observer.onNext(args);
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}
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@Override
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public void onError(Throwable e) {
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observer.onError(e);
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self.unsubscribe();
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}
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@Override
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public void onCompleted() {
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observer.onCompleted();
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self.unsubscribe();
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}
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}
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}
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}

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