modules/flume-ext/src/main/java/org/apache/ignite/stream/flume/EventTransformer.java

/*
 * 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.ignite.stream.flume;

import java.util.List;
import java.util.Map;
import org.jetbrains.annotations.Nullable;

/**
 * Flume event transformer to convert a list of Flume Events to cache entries.
 */
public interface EventTransformer<Event, K, V> {

    /**
     * Transforms a list of Flume Events to cache entries.
     *
     * @param events List of Flume events to transform.
     * @return Cache entries to be written into the grid.
     */
    @Nullable Map<K, V> transform(List<Event> events);
}