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package io.vertx.core.eventbus.impl;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author Tim Fox
 */
public class Handlers {

  private final AtomicInteger pos = new AtomicInteger(0);
  public final List list = new CopyOnWriteArrayList<>();

  public HandlerHolder choose() {
    while (true) {
      int size = list.size();
      if (size == 0) {
        return null;
      }
      int p = pos.getAndIncrement();
      if (p >= size - 1) {
        pos.set(0);
      }
      try {
        return list.get(p);
      } catch (IndexOutOfBoundsException e) {
        // Can happen
        pos.set(0);
      }
    }
  }
}