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package datadog.trace.api.experimental;

import java.util.Collections;
import java.util.Map.Entry;
import java.util.Set;

/** An interface representing the context carrier. Typically, message headers. */
public interface DataStreamsContextCarrier {
  /** @return A set of key value pairs, such as message headers. */
  Set> entries();

  /**
   * @param key parameter to be set
   * @param value to be set
   */
  void set(String key, String value);

  final class NoOp implements DataStreamsContextCarrier {
    public static final DataStreamsContextCarrier INSTANCE = new NoOp();

    private NoOp() {}

    @Override
    public Set> entries() {
      return Collections.emptySet();
    }

    @Override
    public void set(String key, String value) {}
  }
}