Copyright (c) 2016-present, RxJava Contributors.
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.
/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex.internal.subscribers;

import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.internal.functions.Functions;
import io.reactivex.observers.LambdaConsumerIntrospection;
import org.reactivestreams.Subscription;

import io.reactivex.FlowableSubscriber;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.functions.*;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.plugins.RxJavaPlugins;

public final class LambdaSubscriber<T> extends AtomicReference<Subscription>
        implements FlowableSubscriber<T>, Subscription, Disposable, LambdaConsumerIntrospection {

    private static final long serialVersionUID = -7251123623727029452L;
    final Consumer<? super T> onNext;
    final Consumer<? super Throwable> onError;
    final Action onComplete;
    final Consumer<? super Subscription> onSubscribe;

    public LambdaSubscriber(Consumer<? super T> onNext, Consumer<? super Throwable> onError,
            Action onComplete,
            Consumer<? super Subscription> onSubscribe) {
        super();
        this.onNext = onNext;
        this.onError = onError;
        this.onComplete = onComplete;
        this.onSubscribe = onSubscribe;
    }

    @Override
    public void onSubscribe(Subscription s) {
        if (SubscriptionHelper.setOnce(this, s)) {
            try {
                onSubscribe.accept(this);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                s.cancel();
                onError(ex);
            }
        }
    }

    @Override
    public void onNext(T t) {
        if (!isDisposed()) {
            try {
                onNext.accept(t);
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                get().cancel();
                onError(e);
            }
        }
    }

    @Override
    public void onError(Throwable t) {
        if (get() != SubscriptionHelper.CANCELLED) {
            lazySet(SubscriptionHelper.CANCELLED);
            try {
                onError.accept(t);
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                RxJavaPlugins.onError(new CompositeException(t, e));
            }
        } else {
            RxJavaPlugins.onError(t);
        }
    }

    @Override
    public void onComplete() {
        if (get() != SubscriptionHelper.CANCELLED) {
            lazySet(SubscriptionHelper.CANCELLED);
            try {
                onComplete.run();
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                RxJavaPlugins.onError(e);
            }
        }
    }

    @Override
    public void dispose() {
        cancel();
    }

    @Override
    public boolean isDisposed() {
        return get() == SubscriptionHelper.CANCELLED;
    }

    @Override
    public void request(long n) {
        get().request(n);
    }

    @Override
    public void cancel() {
        SubscriptionHelper.cancel(this);
    }

    @Override
    public boolean hasCustomOnError() {
        return onError != Functions.ON_ERROR_MISSING;
    }
}