org.apache.flink.api.common.functions.StoppableFunction Java Examples

The following examples show how to use org.apache.flink.api.common.functions.StoppableFunction. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: StreamExecutionEnvironment.java    From Flink-CEPplus with Apache License 2.0 5 votes vote down vote up 
/**
 * Ads a data source with a custom type information thus opening a
 * {@link DataStream}. Only in very special cases does the user need to
 * support type information. Otherwise use
 * {@link #addSource(org.apache.flink.streaming.api.functions.source.SourceFunction)}
 *
 * @param function
 * 		the user defined function
 * @param sourceName
 * 		Name of the data source
 * @param <OUT>
 * 		type of the returned stream
 * @param typeInfo
 * 		the user defined type information for the stream
 * @return the data stream constructed
 */
@SuppressWarnings("unchecked")
public <OUT> DataStreamSource<OUT> addSource(SourceFunction<OUT> function, String sourceName, TypeInformation<OUT> typeInfo) {

	if (typeInfo == null) {
		if (function instanceof ResultTypeQueryable) {
			typeInfo = ((ResultTypeQueryable<OUT>) function).getProducedType();
		} else {
			try {
				typeInfo = TypeExtractor.createTypeInfo(
						SourceFunction.class,
						function.getClass(), 0, null, null);
			} catch (final InvalidTypesException e) {
				typeInfo = (TypeInformation<OUT>) new MissingTypeInfo(sourceName, e);
			}
		}
	}

	boolean isParallel = function instanceof ParallelSourceFunction;

	clean(function);
	StreamSource<OUT, ?> sourceOperator;
	if (function instanceof StoppableFunction) {
		sourceOperator = new StoppableStreamSource<>(cast2StoppableSourceFunction(function));
	} else {
		sourceOperator = new StreamSource<>(function);
	}

	return new DataStreamSource<>(this, typeInfo, sourceOperator, isParallel, sourceName);
}
Example #2
Source File: StreamExecutionEnvironment.java    From Flink-CEPplus with Apache License 2.0 2 votes vote down vote up 
/**
 * Casts the source function into a SourceFunction implementing the StoppableFunction.
 *
 * <p>This method should only be used if the source function was checked to implement the
 * {@link StoppableFunction} interface.
 *
 * @param sourceFunction Source function to cast
 * @param <OUT> Output type of source function
 * @param <T> Union type of SourceFunction and StoppableFunction
 * @return The casted source function so that it's type implements the StoppableFunction
 */
@SuppressWarnings("unchecked")
private <OUT, T extends SourceFunction<OUT> & StoppableFunction> T cast2StoppableSourceFunction(SourceFunction<OUT> sourceFunction) {
	return (T) sourceFunction;
}