/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.cassandra.cdc.api;

import java.util.function.Consumer;

import org.apache.cassandra.cdc.msg.CdcEvent;

public interface EventConsumer extends Consumer<CdcEvent>
{
    /**
     * Flush any pending events to the transport layer.
     * Called after each micro-batch and before CDC state is persisted, to ensure
     * all events have been durably delivered before the commit-log position advances.
     * If delivery fails, implementations must throw so that state is NOT persisted
     * and the micro-batch will be retried on the next run.
     *
     * @throws InterruptedException if the calling thread is interrupted while flushing
     */
    default void flush() throws InterruptedException
    {
        // no-op by default
    }
}
