I'm having a strange behavior (at least, something that I don't
understand) during derialization/deserialization, which causes values
to be duplicated to a List.
I have a custom Map that basically adds key order preserving through
an ArrayList. Each time a key/value pair is put into the map, the key
is also added to an ArrayList. When a class instance is passed through
a RPC the map is serialized correctly (or at least the data is the
same before and after); but the list seems to be deserialized twice
and two copies of the keys exist after.
In the code below, I instantiate the CustomMap and add the key "10"; I
expect to have one key received on the server and one key sent back to
the client. However, the output is the following:
Before sending: [10]
On server: [10, 10]
Received back: [10, 10, 10]
Am I missing some GWT programming principle?
How could I implement such feature without suffering that problem?
Thanks
Here the code:
/* The custom map; to every put, the key is also added to the list.
*/
public class CustomMap<K, V> extends HashMap<K, V> implements
Serializable, IsSerializable
{
private static final long serialVersionUID =
-1780691944208423396L;
ArrayList<K> list
= new ArrayList<K>();
public CustomMap()
{
}
@Override
public V put( K key, V value )
{
return put( key, value, this.list.size() );
}
public V put( K key, V value, int index )
{
this.list.add( index, key );
return super.put( key, value );
}
public V get( int n )
{
return get( key( n ) );
}
public int indexOf( K key )
{
return this.list.indexOf( key );
}
public K key( int n )
{
return this.list.get( n );
}
public ArrayList<K> getData()
{
return this.list;
}
}
/* The RPC call; just send a CustomMap forth and back
*/
public void onModuleLoad()
{
CustomMap<Long, String> map = new CustomMap<Long, String>();
map.put( new Long( 10 ), "a value" );
System.out.println( "Before sending: " + map.getData() );
service.transfer( map, new AsyncCallback<CustomMap<Long,
String>>(){
@Override
public void onSuccess( CustomMap<Long, String> result )
{
System.out.println( "Received back: " +
result.getData() );
}
@Override
public void onFailure( Throwable caught ) {}
} );
}
/* Server-side code, for completeness
*/
public CustomMap<Long, String> transfer( CustomMap<Long, String>
map )
{
System.out.println( "On server: " + map.getData() );
return map;
}
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