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reactive4java developed by David Karnok

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/*
 * Copyright 2011-2013 David Karnok
 *
 * 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 hu.akarnokd.reactive4java.util;

import hu.akarnokd.reactive4java.base.Action1;
import hu.akarnokd.reactive4java.base.Observable;
import hu.akarnokd.reactive4java.base.Observer;

import java.io.Closeable;

/**
 * Observable which wraps an observable and manages a reference counting closeable.
 * @author akarnokd, 2013.01.16.
 * @since 0.97
 * @param  the element type
 */
public class RefCountObservable extends Producer {
    /** The wrapped observable. */
    protected final Observable source;
    /** The reference counter. */
    protected final RefCountCloseable refCount;
    /**
     * Constructor.
     * @param source the source observable
     * @param refCount the reference counting closeable
     */
    public RefCountObservable(Observable source, RefCountCloseable refCount) {
        this.source = source;
        this.refCount = refCount;
    }

    @Override
    protected Closeable run(Observer observer, Closeable cancel,
            Action1 setSink) {
        
        CompositeCloseable c = new CompositeCloseable(refCount.getCloseable(), cancel);
        
        DefaultSink s = new DefaultSink(observer, c);
        setSink.invoke(s);
        
        return Observers.registerSafe(source, s);
    }

}