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package io.ray.streaming.api.function;

import io.ray.streaming.api.context.RuntimeContext;

/**
 * An interface for all user-defined functions to define the life cycle methods of the functions,
 * and access the task context where the functions get executed.
 */
public interface RichFunction extends Function {

  /**
   * Initialization method for user function which called before the first call to the user
   * function.
   *
   * @param runtimeContext runtime context
   */
  void open(RuntimeContext runtimeContext);

  /**
   * Tear-down method for the user function which called after the last call to the user function.
   */
  void close();
}