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转载需注明出处：http://blog.csdn.net/minimicall，http://cloudtrade.top
Tick：什么是Tick，在交易平台中很常见，事实上就 单笔交易时某仅仅证券的基本数据。
我们通过代码来学习吧：
package org.cryptocoinpartners.schema;
import javax.annotation.Nullable;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import javax.persistence.Transient;
import org.joda.time.Instant;
/**
* A Tick is a point-in-time snapshot of a Market's last price, volume and most recent Book
*一个Tick是某一时刻某个交易品的最新交易价格、量和最新的报价单列表
* @author Tim Olson
*/
@Entity//在数据库中会创建数据表Tick
public class Tick extends PriceData implements Spread {
//继承自PriceData，一些市场的数据就包括了。
public Instant getStartInstant() {
return startInstant;
}
@Transient
public Instant getEndInstant() {
return getTime();
}
@ManyToOne
public Book getLastBook() {
return lastBook;
}
/** @return null if no book was found prior to the window */
@Override
@Transient
public @Nullable
Offer getBestBid() {
return lastBook == null ? null : lastBook.getBestBid();
}
/** @return null if no book was found prior to the window */
@Override
@Transient
public @Nullable
Offer getBestAsk() {
return lastBook == null ? null : lastBook.getBestAsk(); } public Tick(Market market, Instant startInstant, Instant endInstant, @Nullable Long lastPriceCount, @Nullable Long volumeCount, Book lastBook) { super(endInstant, null, market, lastPriceCount, volumeCount); this.startInstant = startInstant; this.lastBook = lastBook; } @Override public String toString() { return String.format("Tick{%s last:%g@%g bid:%s ask:%s}", getMarket(), getVolumeAsDouble(), getPriceAsDouble(), getBestBid(), getBestAsk()); } // JPA protected Tick() { } protected void setStartInstant(Instant startInstant) { this.startInstant = startInstant; } protected void setLastBook(Book lastBook) { this.lastBook = lastBook; } private Instant startInstant; private Book lastBook;//报价单}
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/116329.html原文链接：https://javaforall.net
