rx.joins.Plan2 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava-joins Show documentation
rxjava-joins
The newest version!
/**
 * Copyright 2014 Netflix, Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package rx.joins;

import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;

import rx.Observer;
import rx.functions.Action0;
import rx.functions.Action1;
import rx.functions.Action2;
import rx.functions.Func2;

/**
 * Represents an execution plan for join patterns.
 */
public final class Plan2 extends Plan0 {
    protected final Pattern2 expression;
    protected final Func2 selector;

    public Plan2(Pattern2 expression, Func2 selector) {
        this.expression = expression;
        this.selector = selector;
    }

    @Override
    public ActivePlan0 activate(Map externalSubscriptions,
            final Observer observer, final Action1 deactivate) {
        Action1 onError = onErrorFrom(observer);

        final JoinObserver1 jo1 = createObserver(externalSubscriptions, expression.o1(), onError);
        final JoinObserver1 jo2 = createObserver(externalSubscriptions, expression.o2(), onError);

        final AtomicReference> self = new AtomicReference>();

        ActivePlan2 activePlan = new ActivePlan2(jo1, jo2, new Action2() {
            @Override
            public void call(T1 t1, T2 t2) {
                R result;
                try {
                    result = selector.call(t1, t2);
                } catch (Throwable t) {
                    observer.onError(t);
                    return;
                }
                observer.onNext(result);
            }
        },
                new Action0() {
                    @Override
                    public void call() {
                    	ActivePlan0 ap = self.get();
                        jo1.removeActivePlan(ap);
                        jo2.removeActivePlan(ap);
                        deactivate.call(ap);
                    }
                });

        self.set(activePlan);

        jo1.addActivePlan(activePlan);
        jo2.addActivePlan(activePlan);

        return activePlan;
    }

}