大家好,又见面了,我是全栈君。
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viewmode=contents,http://cloudtrade.top
Listing:挂牌。
比方某仅仅股票在某证券交易所挂牌交易。也就是上市交易。
老规矩,通过源代码学习:
package org.cryptocoinpartners.schema; import java.util.ArrayList; import java.util.List; import javax.persistence.Cacheable; import javax.persistence.Entity; import javax.persistence.Index; import javax.persistence.ManyToOne; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery; import javax.persistence.NoResultException; import javax.persistence.PostPersist; import javax.persistence.Table; import javax.persistence.Transient; import org.cryptocoinpartners.enumeration.FeeMethod; import org.cryptocoinpartners.util.PersistUtil; /** * Represents the possibility to trade one Asset for another */ @SuppressWarnings("UnusedDeclaration") @Entity //在数据库创建Listing这个表 @Cacheable//可缓存
//命名查询 @NamedQueries({ @NamedQuery(name = "Listing.findByQuoteBase", query = "select a from Listing a where base=?1 and quote=?2 and prompt IS NULL"), @NamedQuery(name = "Listing.findByQuoteBasePrompt", query = "select a from Listing a where base=?1 and quote=?2 and prompt=?3") }) @Table(indexes = { @Index(columnList = "base"), @Index(columnList = "quote"), @Index(columnList = "prompt") }) //@Table(name = "listing", uniqueConstraints = { @UniqueConstraint(columnNames = { "base", "quote", "prompt" }), //@UniqueConstraint(columnNames = { "base", "quote" }) }) public class Listing extends EntityBase {
<pre name="code" class="java"> protected Asset base; protected Asset quote; private Prompt prompt;
@ManyToOne(optional = false) //@Column(unique = true) public Asset getBase() { return base; } @PostPersist private void postPersist() { // PersistUtil.clear(); // PersistUtil.refresh(this); //PersistUtil.merge(this); // PersistUtil.close(); //PersistUtil.evict(this); } @ManyToOne(optional = false) //@Column(unique = true) public Asset getQuote() { return quote; } @ManyToOne(optional = true) public Prompt getPrompt() { return prompt; } /** will create the listing if it doesn't exist */ public static Listing forPair(Asset base, Asset quote) { try { Listing listing = PersistUtil.namedQueryZeroOne(Listing.class, "Listing.findByQuoteBase", base, quote); if (listing == null) { listing = new Listing(base, quote); PersistUtil.insert(listing); } return listing; } catch (NoResultException e) { final Listing listing = new Listing(base, quote); PersistUtil.insert(listing); return listing; } } public static Listing forPair(Asset base, Asset quote, Prompt prompt) { try { Listing listing = PersistUtil.namedQueryZeroOne(Listing.class, "Listing.findByQuoteBasePrompt", base, quote, prompt); if (listing == null) { listing = new Listing(base, quote, prompt); PersistUtil.insert(listing); } return listing; } catch (NoResultException e) { final Listing listing = new Listing(base, quote, prompt); PersistUtil.insert(listing); return listing; } } @Override public String toString() { return getSymbol(); } @Transient public String getSymbol() { if (prompt != null) return base.getSymbol() + '.' + quote.getSymbol() + '.' + prompt; return base.getSymbol() + '.' + quote.getSymbol(); } @Transient protected double getMultiplier() { if (prompt != null) return prompt.getMultiplier(); return getContractSize() * getTickSize(); } @Transient protected double getTickValue() { if (prompt != null) return prompt.getTickValue(); return 1; } @Transient protected double getContractSize() { if (prompt != null) return prompt.getContractSize(); return 1; } @Transient protected double getTickSize() { if (prompt != null) return prompt.getTickSize(); return getPriceBasis(); } @Transient protected Amount getMultiplierAsAmount() { return new DiscreteAmount((long) getMultiplier(), getVolumeBasis()); } @Transient protected double getVolumeBasis() { double volumeBasis = 0; if (prompt != null) volumeBasis = prompt.getVolumeBasis(); return volumeBasis == 0 ? getBase().getBasis() : volumeBasis; } @Transient public FeeMethod getMarginMethod() { FeeMethod marginMethod = null; if (prompt != null) marginMethod = prompt.getMarginMethod(); return marginMethod == null ? null : marginMethod; } @Transient public FeeMethod getMarginFeeMethod() { FeeMethod marginFeeMethod = null; if (prompt != null) marginFeeMethod = prompt.getMarginFeeMethod(); return marginFeeMethod == null ? null : marginFeeMethod; } @Transient protected double getPriceBasis() { double priceBasis = 0; if (prompt != null) priceBasis = prompt.getPriceBasis(); return priceBasis == 0 ? getQuote().getBasis() : priceBasis; } @Transient protected Asset getTradedCurrency() { if (prompt != null && prompt.getTradedCurrency() != null) return prompt.getTradedCurrency(); return getQuote(); } @Transient public FeeMethod getFeeMethod() { if (prompt != null && prompt.getFeeMethod() != null) return prompt.getFeeMethod(); return null; } @Transient public double getFeeRate() { if (prompt != null && prompt.getFeeRate() != 0) return prompt.getFeeRate(); return 0; } @Transient protected int getMargin() { if (prompt != null && prompt.getMargin() != 0) return prompt.getMargin(); return 0; } public static List<String> allSymbols() { List<String> result = new ArrayList<>(); List<Listing> listings = PersistUtil.queryList(Listing.class, "select x from Listing x"); for (Listing listing : listings) result.add((listing.getSymbol())); return result; } // JPA protected Listing() { } protected void setBase(Asset base) { this.base = base; } protected void setQuote(Asset quote) { this.quote = quote; } protected void setPrompt(Prompt prompt) { this.prompt = prompt; } public Listing(Asset base, Asset quote) { this.base = base; this.quote = quote; } public Listing(Asset base, Asset quote, Prompt prompt) { this.base = base; this.quote = quote; this.prompt = prompt; } public static Listing forSymbol(String symbol) { symbol = symbol.toUpperCase(); final int dot = symbol.indexOf('.'); if (dot == -1) throw new IllegalArgumentException("Invalid Listing symbol: \"" + symbol + "\""); final String baseSymbol = symbol.substring(0, dot); Asset base = Asset.forSymbol(baseSymbol); if (base == null) throw new IllegalArgumentException("Invalid base symbol: \"" + baseSymbol + "\""); int len = symbol.substring(dot + 1, symbol.length()).indexOf('.'); len = (len != -1) ? Math.min(symbol.length(), dot + 1 + symbol.substring(dot + 1, symbol.length()).indexOf('.')) : symbol.length(); final String quoteSymbol = symbol.substring(dot + 1, len); final String promptSymbol = (symbol.length() > len) ? symbol.substring(len + 1, symbol.length()) : null; Asset quote = Asset.forSymbol(quoteSymbol); if (quote == null) throw new IllegalArgumentException("Invalid quote symbol: \"" + quoteSymbol + "\""); if (promptSymbol == null) return Listing.forPair(base, quote); Prompt prompt = Prompt.forSymbol(promptSymbol); return Listing.forPair(base, quote, prompt); } @Override public boolean equals(Object obj) { if (obj instanceof Listing) { Listing listing = (Listing) obj; if (!listing.getBase().equals(getBase())) { return false; } if (!listing.getQuote().equals(getQuote())) { return false; } if (listing.getPrompt() != null) if (this.getPrompt() != null) { if (!listing.getPrompt().equals(getPrompt())) return false; } else { return false; } return true; } return false; } @Override public int hashCode() { return getPrompt() != null ? getQuote().hashCode() + getBase().hashCode() + getPrompt().hashCode() : getQuote().hashCode() + getBase().hashCode(); } }
protected Asset base; protected Asset quote; private Prompt prompt;
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