10、OSGi 拍卖应用开发与优化全解析

OSGi 拍卖应用开发与优化全解析

1. 拍卖应用的实现

1.1 AuctionWrapper 类

AuctionWrapper 类实现了标准的包装器设计模式，将所有方法调用委托给原始的拍卖和参与者对象实例。以下是该类的部分代码：

public AuctionWrapper(Auctioneer delegate, Collection<Auditor> auditors) {
    this.delegate = delegate;
    this.auditors = auditors;
}
public Float ask(String item, float price, Participant seller) throws InvalidOfferException {
    ask = price;
    return delegate.getAuction().ask(item, price, new ParticipantWrapper(seller));
}
public Float bid(String item, float price, Participant buyer) throws InvalidOfferException {
    List<Float> bids = bidsPerItem.get(item);
    if (bids == null) {
        bids = new LinkedList<Float>();
        bidsPerItem.put(item, bids);
    }
    bids