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Datadog core library

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package com.datadoghq.trace.writer;

import com.datadoghq.trace.DDBaseSpan;
import com.datadoghq.trace.Service;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;

/** List writer used by tests mostly */
public class ListWriter extends CopyOnWriteArrayList>> implements Writer {

  public List>> getList() {
    return this;
  }

  public List> firstTrace() {
    return get(0);
  }

  @Override
  public void write(final List> trace) {
    add(trace);
  }

  @Override
  public void writeServices(final Map services) {
    throw new UnsupportedOperationException();
  }

  @Override
  public void start() {
    clear();
  }

  @Override
  public void close() {
    clear();
  }
}