/*
 *  Copyright 2016-2019 Netflix, Inc.
 *
 *     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.netflix.hollow.api.producer.listener;

import com.netflix.hollow.api.producer.HollowProducer;
import com.netflix.hollow.api.producer.Status;
import java.time.Duration;

/**
 * A listener of announcement events associated with the producer announcement stage.
 * <p>
 * A announcement listener instance may be registered when building a {@link HollowProducer producer}
 * (see {@link HollowProducer.Builder#withListener(HollowProducerEventListener)}} or by
 * registering on the producer itself
 * (see {@link HollowProducer#addListener(HollowProducerEventListener)}.
 */
public interface AnnouncementListener extends HollowProducerEventListener {
    /**
     * Called when the {@code HollowProducer} has begun announcing the {@code HollowBlob} published this cycle.
     *
     * @param version of {@code HollowBlob} that will be announced.
     */
    void onAnnouncementStart(long version);

    /**
     * Called when the {@code HollowProducer} has begun announcing the {@code HollowBlob} published this cycle.
     * This method is useful for cases where the read state passed from upstream can be used to compute added,
     * removed and updated ordinals.
     *
     * @param readState the read state
     *
     */
    void onAnnouncementStart(HollowProducer.ReadState readState);

    /**
     * Called after the announcement stage finishes normally or abnormally. A {@code SUCCESS} status indicates
     * that the {@code HollowBlob} published this cycle has been announced to consumers.
     *
     * @param status CycleStatus of the announcement stage. {@link Status#getType()} will return {@code SUCCESS}
     * when the announce was successful; @{code FAIL} otherwise.
     * @param readState the read state
     * @param version of {@code HollowBlob} that was announced.
     * @param elapsed duration of the announcement stage in {@code unit} units
     */
    void onAnnouncementComplete(Status status, HollowProducer.ReadState readState, long version, Duration elapsed);
}

@@ -1867,32 +1867,40 @@
   *%0A     */%0A    
+default 
 void onAnnouncem
@@ -1943,16 +1943,20 @@
 adState)
+ %7B %7D
 ;%0A%0A    /

Make the newly added endpoint in AnnouncementListener a default method for backwards compatibility