/*
* 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.contrib.streaming;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.minicluster.LocalFlinkMiniCluster;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.util.TestStreamEnvironment;
import org.apache.flink.util.TestLogger;
import org.junit.Test;
import java.util.Iterator;
import static org.junit.Assert.*;
/**
* This test verifies the behavior of DataStreamUtils.collect.
*/
public class CollectITCase extends TestLogger {
@Test
public void testCollect() throws Exception {
final LocalFlinkMiniCluster cluster = new LocalFlinkMiniCluster(new Configuration(), false);
try {
cluster.start();
TestStreamEnvironment.setAsContext(cluster, 1);
final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
final long N = 10;
DataStream<Long> stream = env.generateSequence(1, N);
long i = 1;
for (Iterator<Long> it = DataStreamUtils.collect(stream); it.hasNext(); ) {
long x = it.next();
assertEquals("received wrong element", i, x);
i++;
}
assertEquals("received wrong number of elements", N + 1, i);
}
finally {
TestStreamEnvironment.unsetAsContext();
cluster.stop();
}
}
}