/*
 * Copyright 2019 Ververica GmbH
 *
 * Licensed 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 com.ververica.flinktraining.examples.datastream_java.utils;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction;

import java.util.Random;

public class RandomLongSource extends RichParallelSourceFunction<Long> {

	private volatile boolean cancelled = false;
	private Random random;

	@Override
	public void open(Configuration parameters) throws Exception {
		super.open(parameters);
		random = new Random();
	}

	@Override
	public void run(SourceContext<Long> ctx) throws Exception {
		while (!cancelled) {
			Long nextLong = random.nextLong();
			synchronized (ctx.getCheckpointLock()) {
				ctx.collect(nextLong);
			}
		}
	}

	@Override
	public void cancel() {
		cancelled = true;
	}
}
