For this example I have a different method for updating an existing album in Java

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class AlbumAssembler public void updateAlbum(String id, AlbumDTO source) { Album current = RegistryfindAlbum(id); if (current == null) throw new RuntimeException("Album does not exist: " + sourcegetTitle()); if (sourcegetTitle() != currentgetTitle()) currentsetTitle(sourcegetTitle()); if (sourcegetArtist() != currentgetArtist()getName()) { Artist artist = RegistryfindArtistNamed(sourcegetArtist()); if (artist == null) throw new RuntimeException("No artist named " + sourcegetArtist()); currentsetArtist(artist); }
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updateTracks(source, current); } private void updateTracks(AlbumDTO source, Album current) { for (int i = 0; i < sourcegetTracks()length; i++) { currentgetTrack(i)setTitle(sourcegetTrackDTO(i)getTitle()); currentgetTrack(i)clearPerformers(); createPerformers(currentgetTrack(i), sourcegetTrackDTO(i)getPerformers()); } }
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As for updates you can decide to either update the existing domain object or destroy it and replace it with a new one The question here is whether you have other objects referring to the object you want to update In this code I'm updating the album since I have other objects referring to it and its tracks However, for the title and performers of a track I just replace the objects that are there
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Another question concerns an artist changing Is this changing the name of the existing artist or changing the artist the album is linked to Again, these questions have to be settled on a case-by-use case basis, and I'm handling it by linking to a new artist
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In this example I've used native binary serialization, which means I have to be careful that the Data Transfer Object classes on both sides of the wire are kept in sync If I make a change to the data structure of the server Data Transfer Object and don't change the client, I'll get errors in the transfer I can make the transfer more tolerant by using a map as my serialization
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class TrackDTO public Map writeMap() { Map result = new HashMap(); resultput("title", title); resultput("performers", performers); return result; } public static TrackDTO readMap(Map arg) { TrackDTO result = new TrackDTO(); resulttitle = (String) argget("title"); resultperformers = (String[]) argget("performers"); return result; }
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Now, if I add a field to the server and use the old client, although the new field won't be picked up by the client, the rest of the data will transfer correctly
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Of course, writing the serialization and deserialization routines like this is tedious I can avoid much of this tedium by using a reflective routine such as this on the Layer Supertype (475):
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class DataTransferObject public Map writeMapReflect() { Map result = null; try { Field[] fields = thisgetClass()getDeclaredFields(); result = new HashMap(); for (int i = 0; i < fieldslength; i++) resultput(fields[i]getName(), fields[i]get(this)); }catch (Exception e) {throw new ApplicationException (e); } return result; }
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public static TrackDTO readMapReflect(Map arg) { TrackDTO result = new TrackDTO(); try { Field[] fields = resultgetClass()getDeclaredFields(); for (int i = 0; i < fieldslength; i++) fields[i]set(result, argget(fields[i]getName())); }catch (Exception e) {throw new ApplicationException (e); } return result; }
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Such a routine will handle most cases pretty well (although you'll have to add extra code to handle primitives)
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Example: Serializing Using XML (Java)
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As I write this, Java's XML handling is very much in flux and APIs, still volatile, are generally getting better By the time you read it this section may be out of date or completely irrelevant, but the basic concept of converting to XML is pretty much the same
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First I get the data structure for the Data Transfer Object; then I need to decide how to serialize it In Java you get free binary serialization simply by using a marker interface This works completely automatically for a Data Transfer Object so it's my first choice However, text-based serialization is often necessary For this example then, I'll use XML
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For this example, I'm using JDOM since that makes working with XML much easier than using the W3C standard interfaces I write methods to read and write an XML element to represent that class each Data Transfer Object class
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class AlbumDTO Element toXmlElement() { Element root = new Element("album"); rootsetAttribute("title", title); rootsetAttribute("artist", artist); for (int i = 0; i < trackslength; i++) rootaddContent(tracks[i]toXmlElement()); return root; } static AlbumDTO readXml(Element source) { AlbumDTO result = new AlbumDTO(); resultsetTitle(sourcegetAttributeValue("title")); resultsetArtist(sourcegetAttributeValue("artist")); List trackList = new ArrayList(); Iterator it = sourcegetChildren("track")iterator(); while (ithasNext()) trackListadd(TrackDTOreadXml((Element) itnext())); resultsetTracks((TrackDTO[]) trackListtoArray(new TrackDTO[0])); return result; } class TrackDTO Element toXmlElement() { Element result = new Element("track"); resultsetAttribute("title", title); for (int i = 0; i < performerslength; i++) { Element performerElement = new Element("performer"); performerElementsetAttribute("name", performers[i]); resultaddContent(performerElement); }
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return result; } static TrackDTO readXml(Element arg) { TrackDTO result = new TrackDTO(); resultsetTitle(arggetAttributeValue("title")); Iterator it = arggetChildren("performer")iterator(); List buffer = new ArrayList(); while (ithasNext()) { Element eachElement = (Element) itnext(); bufferadd(eachElementgetAttributeValue("name")); } resultsetPerformers((String[]) buffertoArray(new String[0])); return result; }
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Of course, these methods only create the elements in the XML DOM To perform the serialization I need to read and write text Since the track is transferred only in the context of the album, I just need to write this album code
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class AlbumDTO public void toXmlString(Writer output) { Element root = toXmlElement(); Document doc = new Document(root); XMLOutputter writer = new XMLOutputter(); try { writeroutput(doc, output); }catch (IOException e) { eprintStackTrace(); } } public static AlbumDTO readXmlString(Reader input) { try { SAXBuilder builder = new SAXBuilder(); Document doc = builderbuild(input); Element root = docgetRootElement(); AlbumDTO result = readXml(root); return result; }catch (Exception e) { eprintStackTrace(); throw new RuntimeException(); } }
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