org.apache.pulsar.functions.api.examples.WindowDurationFunction Maven / Gradle / Ivy

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/*
 * 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;


/**
 * This functions collects the timestamp during the window operation.
 */
public class WindowDurationFunction implements java.util.function.Function, String> {
    @Override
    public String apply(Collection integers) {
        long time = System.currentTimeMillis();
        return String.format("%s:%s", String.join(",", integers), time);
    }
}