/*
 * 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.flink.test.util;

import org.apache.flink.api.common.io.GenericInputFormat;
import org.apache.flink.api.java.tuple.Tuple2;

import java.io.IOException;

/** Generates an infinite series of integer 2-tuples elements with optional read delay. */
public class InfiniteIntegerTupleInputFormat extends GenericInputFormat<Tuple2<Integer, Integer>> {
    private static final long serialVersionUID = 1L;
    private static final int DELAY = 20;
    private final boolean delay;

    public InfiniteIntegerTupleInputFormat(boolean delay) {
        this.delay = delay;
    }

    @Override
    public boolean reachedEnd() throws IOException {
        return false;
    }

    @Override
    public Tuple2<Integer, Integer> nextRecord(Tuple2<Integer, Integer> reuse) throws IOException {
        if (delay) {
            try {
                Thread.sleep(DELAY);
            } catch (InterruptedException iex) {
                // do nothing
            }
        }
        return new Tuple2<>(1, 1);
    }
}