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/*
* Copyright 2014 Prateek Srivastava
*
* 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 com.f2prateek.couchpotato.data.rx;
import android.app.Activity;
public class ActivitySubscriptionManager extends SubscriptionManager<Activity> {
public ActivitySubscriptionManager(Activity instance) {
super(instance);
}
@Override protected boolean validate(final Activity activity) {
return !activity.isFinishing();
}
}
public class BaseFragment extends Fragment {
private final SubscriptionManager<Fragment> = new FragmentSubscriptionManger(this);
...
@Override public void onPause() {
subscriptionManager.unsubscribeAll();
super.onPause();
}
}
/*
* Copyright 2014 Prateek Srivastava
*
* 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 com.f2prateek.couchpotato.data.rx;
import android.app.Fragment;
public class FragmentSubscriptionManager extends SubscriptionManager<Fragment> {
public FragmentSubscriptionManager(Fragment instance) {
super(instance);
}
@Override protected boolean validate(final Fragment fragment) {
return fragment.isAdded() && !fragment.getActivity().isFinishing();
}
}
/*
* Copyright 2014 Prateek Srivastava
*
* 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 com.f2prateek.couchpotato.data.rx;
import rx.Observable;
import rx.Observer;
import rx.Subscription;
import rx.android.observables.Assertions;
import rx.functions.Func1;
import rx.operators.OperatorConditionalBinding;
import rx.subscriptions.CompositeSubscription;
import static rx.android.schedulers.AndroidSchedulers.mainThread;
/**
* A class to help manage subscriptions. It will automatically unsubscribe any subscription if the
* predicate does not validate.
*/
public abstract class SubscriptionManager<T> {
private final T instance;
private final Func1<T, Boolean> predicate = new Func1<T, Boolean>() {
@Override
public Boolean call(T object) {
return validate(object);
}
};
private final CompositeSubscription subscriptions = new CompositeSubscription();
public SubscriptionManager(T instance) {
this.instance = instance;
}
public <O> void subscribe(final Observable<O> source, final Observer<O> observer) {
Assertions.assertUiThread();
Subscription subscription = source.observeOn(mainThread())
.lift(new OperatorConditionalBinding<O, T>(instance, predicate))
.subscribe(observer);
subscriptions.add(subscription);
}
public void unsubscribe() {
subscriptions.unsubscribe();
}
/**
* Return a {@link rx.functions.Func1} implementation that will be a predicate for {@link
* OperatorConditionalBinding}. If the predicate fails to validate, the sequence unsubscribes
* itself and releases the bound reference.
*/
protected abstract boolean validate(final T object);
}
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