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package io.ray.streaming.api.function.impl;

import io.ray.streaming.api.function.Function;

/**
 * Interface of Source functions.
 *
 * @param  Type of the data output by the source.
 */
public interface SourceFunction extends Function {

  void init(int parallel, int index);

  void run(SourceContext ctx) throws Exception;

  void close();

  interface SourceContext {

    void collect(T element) throws Exception;

  }
}