Serialization optimization for UUID keys.

[joval]

Hi Jan,

This is a change from a user who follows my clone of JDBM. I think it looks like a good change; you might want to consider merging it yourself.

Here is the diff ignoring whitespace changes:

diff --git a/src/main/java/org/apache/jdbm/Serialization.java b/src/main/java/org/apache/jdbm/Serialization.java
index b8fccce..0e1d56a 100644
--- a/src/main/java/org/apache/jdbm/Serialization.java
+++ b/src/main/java/org/apache/jdbm/Serialization.java
@@ -263,6 +263,10 @@ public class Serialization extends SerialClassInfo implements Serializer {
out.write(DATE);
out.writeLong(((Date) obj).getTime());
return;

•    } else if (clazz == UUID.class) {
  

•        out.write(UUID);
  

•        serializeUUID(out,(UUID) obj);
  

•        return;
   } else if (clazz == BTree.class) {
       out.write(BTREE);
       ((BTree) obj).writeExternal(out);
  

  @@ -407,6 +411,12 @@ public class Serialization extends SerialClassInfo implements Serializer {

  }

• private void serializeUUID(DataOutput out, UUID uuid) throws IOException

• {

•   out.writeLong(uuid.getMostSignificantBits());
  

•   out.writeLong(uuid.getLeastSignificantBits());
  

• }

• private void serializeMap(int header, DataOutput out, Object obj, FastArrayList objectStack) throws IOException {
  Map l = (Map) obj;
  out.write(header);
  @@ -432,7 +442,6 @@ public class Serialization extends SerialClassInfo implements Serializer {
  out.write(b);
  }

 private void writeLongArray(DataOutput da, long[] obj) throws IOException {
     long max = Long.MIN_VALUE;
     long min = Long.MAX_VALUE;

@@ -824,6 +833,9 @@ public class Serialization extends SerialClassInfo implements Serializer {
case DATE:
ret = new Date(is.readLong());
break;

•        case UUID:
  

•           ret = deserializeUUID(is);
  

•           break;
       case ARRAY_INT_B_255:
           ret = deserializeArrayIntB255(is);
           break;
  

  @@ -1068,6 +1080,11 @@ public class Serialization extends SerialClassInfo implements Serializer {
  return ret;
  }

• private UUID deserializeUUID(DataInput is) throws IOException

• {

•   return new UUID(is.readLong(), is.readLong());
  

• }

private int[] deserializeArrayIntB255(DataInput is) throws IOException {
int size = is.readUnsignedByte();
if (size < 0)
diff --git a/src/main/java/org/apache/jdbm/SerializationHeader.java b/src/main/java/org/apache/jdbm/SerializationHeader.java
index e3ec45c..8e86836 100644
--- a/src/main/java/org/apache/jdbm/SerializationHeader.java
+++ b/src/main/java/org/apache/jdbm/SerializationHeader.java
@@ -120,6 +120,7 @@ final class SerializationHeader {

final static int CLASS = 126;
final static int DATE = 127;

• final static int UUID = 128;

static final int JDBMLINKEDLIST = 159;
diff --git a/src/test/java/org/apache/jdbm/SerializationTest.java b/src/test/java/org/apache/jdbm/SerializationTest.java
index c61f743..57a58e7 100644
--- a/src/test/java/org/apache/jdbm/SerializationTest.java
+++ b/src/test/java/org/apache/jdbm/SerializationTest.java
@@ -399,6 +399,18 @@ public class SerializationTest extends TestCase {
assertEquals(d, ser.deserialize(ser.serialize(d)));
}

• public void testUUID() throws IOException, ClassNotFoundException {

•   //try a bunch of UUIDs.
  

•   for(int i = 0; i < 1000;i++)
  

•   {
  

•       UUID uuid = UUID.randomUUID();
  

•       SimpleEntry a = new SimpleEntry(uuid, "11");
  

•       byte[] buf = ser.serialize(a);
  

•       SimpleEntry b = (SimpleEntry) ser.deserialize(buf);
  

•       assertEquals(b, a);
  

•   }
  

• }

public void testLocale() throws Exception{
assertEquals(Locale.FRANCE, ser.deserialize(ser.serialize(Locale.FRANCE)));