io.scalecube.examples.orderbook.service.engine.PriceLevel Maven / Gradle / Ivy

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package io.scalecube.examples.orderbook.service.engine;

import io.scalecube.examples.orderbook.service.engine.events.MatchOrder;
import io.scalecube.examples.orderbook.service.engine.events.Side;

import java.util.ArrayList;

import reactor.core.publisher.EmitterProcessor;

public class PriceLevel {

  private Side side;

  private long price;

  private ArrayList orders;

  public PriceLevel(Side side, long price) {
    this.side = side;
    this.price = price;
    this.orders = new ArrayList<>();
  }

  public Side side() {
    return side;
  }

  public long price() {
    return price;
  }

  public boolean isEmpty() {
    return orders.isEmpty();
  }

  public Order add(long orderId, long size) {
    Order order = new Order(this, orderId, size);
    orders.add(order);
    return order;
  }

  public long match(long orderId, Side side, long size, EmitterProcessor matchEmmiter) {
    long quantity = size;
    while (quantity > 0 && !orders.isEmpty()) {
      Order order = orders.get(0);
      long orderQuantity = order.size();
      if (orderQuantity > quantity) {
        order.reduce(quantity);
        matchEmmiter.onNext(new MatchOrder(order.id(), orderId, side, price, quantity, order.size()));
        quantity = 0;
      } else {
        orders.remove(0);
        matchEmmiter.onNext(new MatchOrder(order.id(), orderId, side, price, orderQuantity, 0));
        quantity -= orderQuantity;
      }
    }
    return quantity;
  }

  public void delete(Order order) {
    orders.remove(order);
  }

}