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The official Couchbase JVM Core IO Library

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/**
 * Copyright (c) 2015 Couchbase, Inc.
 *
 * 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 DEALING
 * IN THE SOFTWARE.
 */
package com.couchbase.client.core.event;

import rx.Observable;
import rx.Scheduler;
import rx.subjects.PublishSubject;
import rx.subjects.Subject;

/**
 * The default event bus implementation.
 *
 * @author Michael Nitschinger
 * @since 1.1.0
 */
public class DefaultEventBus implements EventBus {

    private final Subject bus;
    private final Scheduler scheduler;

    public DefaultEventBus(final Scheduler scheduler) {
        bus = PublishSubject.create();
        this.scheduler = scheduler;
    }

    @Override
    public Observable get() {
        return bus.onBackpressureDrop().observeOn(scheduler);
    }

    @Override
    public void publish(final CouchbaseEvent event) {
        if (bus.hasObservers()) {
            bus.onNext(event);
        }
    }

}