/*
* Copyright � 2016 TIBCO Software,Inc.All rights reserved.
* http://community.jaspersoft.com/project/jaspermobile-android
*
* Unless you have purchased a commercial license agreement from TIBCO Jaspersoft,
* the following license terms apply:
*
* This program is part of TIBCO Jaspersoft Mobile for Android.
*
* TIBCO Jaspersoft Mobile is free software:you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation,either version 3of the License,or
* (at your option)any later version.
*
* TIBCO Jaspersoft Mobile is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY;without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with TIBCO Jaspersoft Mobile for Android.If not,see
* <http://www.gnu.org/licenses/lgpl>.
*/
package com.jaspersoft.android.jaspermobile.domain.interactor;
import android.support.annotation.NonNull;
import com.jaspersoft.android.jaspermobile.domain.executor.PostExecutionThread;
import com.jaspersoft.android.jaspermobile.domain.executor.PreExecutionThread;
import rx.Observable;
import rx.Subscriber;
import rx.Subscription;
import rx.subscriptions.Subscriptions;
/**
* @author Tom Koptel
* @since 2.3
*/
public abstract class AbstractUseCase2<Result, Argument> implements UseCase2<Result, Argument> {
private Subscription mSubscription = Subscriptions.empty();
private Observable<Result> mCommand;
/**
* Builds an {@link rx.Observable} which will be used when executing the current {@link AbstractSimpleUseCase}.
*/
protected abstract Observable<Result> buildUseCaseObservable(Argument argument);
private final PreExecutionThread mPreExecutionThread;
private final PostExecutionThread mPostExecutionThread;
protected AbstractUseCase2(PreExecutionThread preExecutionThread, PostExecutionThread postExecutionThread) {
mPreExecutionThread = preExecutionThread;
mPostExecutionThread = postExecutionThread;
}
/**
* Executes the current use case.
*
* @param useCaseSubscriber The guy who will be listen to the observable build with {@link #buildUseCaseObservable(Argument)}.
*/
@Override
public Subscription execute(@NonNull Argument argument, @NonNull Subscriber<? super Result> useCaseSubscriber) {
mCommand = this.buildUseCaseObservable(argument);
return createSubscription(useCaseSubscriber);
}
/**
* Rebinds subscriber to already executed action
*
* @param useCaseSubscriber The guy who will be listen to the observable build with {@link #buildUseCaseObservable(Argument)}.
*/
@Override
public Subscription subscribe(Subscriber<? super Result> useCaseSubscriber) {
if (mCommand == null) {
return Subscriptions.empty();
}
return createSubscription(useCaseSubscriber);
}
/**
* Unsubscribes from current {@link rx.Subscription}.
*/
@Override
public void unsubscribe() {
if (!mSubscription.isUnsubscribed()) {
mSubscription.unsubscribe();
}
}
private Subscription createSubscription(@NonNull Subscriber<? super Result> useCaseSubscriber) {
mSubscription = mCommand
.subscribeOn(mPreExecutionThread.getScheduler())
.observeOn(mPostExecutionThread.getScheduler())
.subscribe(useCaseSubscriber);
return mSubscription;
}
}