org.apache.flink.streaming.api.datastream.DataStreamSource 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.flink.streaming.api.datastream;
import org.apache.flink.annotation.Public;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.operators.StreamSource;
import org.apache.flink.streaming.api.transformations.SourceTransformation;
/**
* The DataStreamSource represents the starting point of a DataStream.
*
* @param Type of the elements in the DataStream created from the this source.
*/
@Public
public class DataStreamSource extends SingleOutputStreamOperator {
boolean isParallel;
public DataStreamSource(StreamExecutionEnvironment environment,
TypeInformation outTypeInfo, StreamSource operator,
boolean isParallel, String sourceName) {
super(environment, new SourceTransformation<>(sourceName, operator, outTypeInfo, environment.getParallelism()));
this.isParallel = isParallel;
if (!isParallel) {
setParallelism(1);
}
}
public DataStreamSource(SingleOutputStreamOperator operator) {
super(operator.environment, operator.getTransformation());
this.isParallel = true;
}
@Override
public DataStreamSource setParallelism(int parallelism) {
if (parallelism != 1 && !isParallel) {
throw new IllegalArgumentException("Source: " + transformation.getId() + " is not a parallel source");
} else {
super.setParallelism(parallelism);
return this;
}
}
}