In the current snapshot (3.1), Hessian has a Locale Serializer for
exactly the reasons you've given. 3.1.1 is expected by the end of
next week, so the updates will be available soon.
-- Scott
On Apr 27, 2007, at 2:44 PM, Alex Cruikshank wrote:
> We've begun localizing an application that uses BurlapProxyFactory to
> transport objects between servers. As part of this process, we've
> added a java.util.Locale property to all of the objects.
> Unfortunately, the Locale object has no no-arg constructor, and all
> the other constructors throw NPE's when provided null arguments. I
> tried having the getter methods wrap the locale in an object that is
> burlap friendly, but the Locale class has been marked final.
>
> I've written LocaleSerializer and LocaleDeserializer classes based on
> the SqlDateDeserializer that solve this problem. They are included
> along with a test at the bottom of this message. Unfortunately, there
> does not seem to be a way to augment the SerializerFactory used by the
> BurlapOutput or BurlapInput objects in the proxy. I recognize that
> including serializers for all classes that are incompatible with
> Hessian/Burlap is not feasible, but I would argue this is a special
> case because:
>
> 1) The Locale class is in the java.util package, and could not be
> more standard.
> 2) Localization is a common development task, and - no matter what you
> might think of it's implementation - the Locale object is the right
> way to encapsulate localization information.
> 3) The fact that the Locale class is final makes it very difficult to
> work around the absence of a custom serializer.
>
> Regardless of whether LocaleSerializer is added to the default
> SerializerFactory, it would be handy to be able to map additional
> serializers when using the BurlapProxyFactory API. It appears that
> adding a serializerFactory property to the BurlapProxyFactory and
> setting the property in the getBurlapInput() and getBurlapOutput()
> methods would be all that is necessary to allow developers to
> customize the serialization from proxy classes.
>
> At any rate, I hope you will consider adding Locale serialization and
> deserialization in the next release Hessian/Burlap release.
>
> Thanks,
> Alex Cruikshank
> Carbon Five
>
> ................................
> LocaleSerializer.....................................
> package com.caucho.hessian.io;
>
> import java.io.IOException;
> import java.util.Date;
> import java.util.Locale;
>
> /**
> * Serializing a java.util.Locale object.
> */
> public class LocaleSerializer extends AbstractSerializer
> {
> public void writeObject(Object obj, AbstractHessianOutput out)
> throws IOException
> {
> if (obj == null)
> out.writeNull();
> else {
> Class cl = obj.getClass();
>
> int ref = out.writeObjectBegin(cl.getName());
>
> if (ref < 0) {
> out.writeString("language");
> out.writeString( ((Locale) obj).getLanguage() );
> out.writeString("country");
> out.writeString( ((Locale) obj).getCountry() );
> out.writeString("variant");
> out.writeString( ((Locale) obj).getVariant() );
> out.writeMapEnd();
> }
> else {
> if (ref == 0)
> {
> out.writeInt(3);
> out.writeString("language");
> out.writeString("country");
> out.writeString("variant");
> }
> out.writeString( ((Locale) obj).getLanguage() );
> out.writeString( ((Locale) obj).getCountry() );
> out.writeString( ((Locale) obj).getVariant() );
> }
> }
> }
> }
>
>
> ................................ LocaleDeserializer
> .....................................
> package com.caucho.hessian.io;
>
> import java.io.IOException;
> import java.util.Locale;
>
> /**
> * Deserializing a string valued Locale object
> */
> public class LocaleDeserializer extends AbstractDeserializer {
>
> public LocaleDeserializer()
> {
> }
>
> public Class getType()
> {
> return Locale.class;
> }
>
> public Object readMap(AbstractHessianInput in)
> throws IOException
> {
> String language = null;
> String country = null;
> String variant = null;
>
> while (! in.isEnd()) {
> String key = in.readString();
>
> if (key.equals("language"))
> language = in.readString();
> else if (key.equals("country"))
> country = in.readString();
> else if (key.equals("variant"))
> variant = in.readString();
> else
> in.readString();
> }
>
> in.readMapEnd();
>
> return create(language,country,variant);
> }
>
> public Object readObject(AbstractHessianInput in, String []
> fieldNames)
> throws IOException
> {
> String language = null;
> String country = null;
> String variant = null;
>
> for (int i = 0; i < fieldNames.length; i++) {
> String key = fieldNames[i];
>
> if (key.equals("language"))
> language = in.readString();
> else if (key.equals("country"))
> country = in.readString();
> else if (key.equals("variant"))
> variant = in.readString();
> else
> in.readObject();
> }
>
> return create(language,country,variant);
> }
>
> private Object create( String language, String country, String
> variant )
> throws IOException
> {
> if (language == null)
> throw new IOException("Locale expects language.");
>
> try {
> return new Locale(language, country, variant);
> } catch (Exception e) {
> throw new IOExceptionWrapper(e);
> }
> }
> }
>
> ................................ LocaleSeserializerTest
> .....................................
> package com.caucho.hessian.io;
>
> import com.caucho.burlap.io.*;
>
> import java.io.*;
> import java.util.*;
>
> import junit.framework.TestCase;
>
> public class LocaleSerializerTest extends TestCase
> {
> public void testLocaleInBurlap() throws Exception
> {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> BurlapOutput out = new BurlapOutput(baos);
> out.writeObject(new Locale("en"));
> out.writeObject(new Locale("en","US"));
> out.writeObject(new Locale("en","US","drawl"));
>
> ByteArrayInputStream bain = new ByteArrayInputStream
> (baos.toByteArray());
> BurlapInput in = new BurlapInput(bain);
>
> assertEquals( Locale.ENGLISH, in.readObject() );
> assertEquals( Locale.US, in.readObject() );
> assertEquals( new Locale("en","US","drawl"), in.readObject() );
> }
>
> public void testLocaleInHessian() throws Exception
> {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> HessianOutput out = new HessianOutput(baos);
> out.writeObject(new Locale("en"));
> out.writeObject(new Locale("en","US"));
> out.writeObject(new Locale("en","US","drawl"));
>
> ByteArrayInputStream bain = new ByteArrayInputStream
> (baos.toByteArray());
> HessianInput in = new HessianInput(bain);
>
> assertEquals( Locale.ENGLISH, in.readObject() );
> assertEquals( Locale.US, in.readObject() );
> assertEquals( new Locale("en","US","drawl"), in.readObject() );
> }
>
> public void testLocaleInHessian2() throws Exception
> {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> Hessian2Output out = new Hessian2Output(baos);
> out.writeObject(new Locale("en"));
> out.writeObject(new Locale("en","US"));
> out.writeObject(new Locale("en","US","drawl"));
> out.flush();
>
> ByteArrayInputStream bain = new ByteArrayInputStream
> (baos.toByteArray());
> Hessian2Input in = new Hessian2Input(bain);
>
> assertEquals( Locale.ENGLISH, in.readObject() );
> assertEquals( Locale.US, in.readObject() );
> assertEquals( new Locale("en","US","drawl"), in.readObject() );
> }
> }
>
>
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