org.apache.pulsar.functions.api.examples.AddWindowFunction Maven / Gradle / Ivy
/*
* 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.pulsar.functions.api.examples;
import java.util.Collection;
import java.util.function.Function;
import lombok.extern.slf4j.Slf4j;
/**
* Example Function that acts on a window of tuples at a time rather than per tuple basis.
*/
@Slf4j
public class AddWindowFunction implements Function, Integer> {
@Override
public Integer apply(Collection integers) {
return integers.stream().reduce(0, (x, y) -> x + y);
}
}