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// ============================================================================
// Copyright (c) 2017-2019 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.promise;

import static java.util.Objects.requireNonNull;

import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;

import functionalj.result.Result;

public class SubscriptionHolder extends SubscriptionRecord {
    
    private final AtomicReference>> consumer = new AtomicReference>>(null);
    private final SubscriptionRecord subscription;
    
    SubscriptionHolder(boolean isEavesdropping, Wait wait, Promise promise) {
        super(promise);
        this.subscription = promise.doSubscribe(isEavesdropping, requireNonNull(wait), result -> {
            Consumer> consumer = this.consumer.get();
            if (consumer != null)
                consumer.accept(result);
        });
    }
    
    public Consumer> getConsumer() {
        return this.consumer.get();
    }
    
    public SubscriptionHolder assign(Consumer> consumer) {
        Result result = subscription.getPromise().getCurrentResult();
        this.consumer.set(consumer);
        if (result.isReady()) {
            consumer.accept(result);
        }
        return this;
    }
    
    public SubscriptionHolder unsubscribe() {
        subscription.unsubscribe();
        return this;
    }
    
}