I'd also be curious to hear other thoughts here, but here are a few to
add to the pot;
1) You've of course already noted that NetcdfFile/NetcdfDataset does not
have the Serializable marker interface.
2) For binary representation, you could look at base64 encoded byte
arrays (for example, but yuck) as Netcdf API uses files alot (need to
check applet restrictions on file use). I also noted this constructor
which may be of use for deserialization if you wanted to avoid writing a
temporary file to disk (possibly not recommended);
/**
* Open an in-memory netcdf file.
*
* @param location location of file, used as the name.
* @param data in-memory netcdf file
* @return memory-resident NetcdfFile
* @throws java.io.IOException if error
*/
public static NetcdfFile openInMemory(String location, byte[] data)
throws IOException {
ucar.unidata.io.InMemoryRandomAccessFile raf = new
ucar.unidata.io.InMemoryRandomAccessFile(location, data);
return open(raf, location, null, null);
}
While I'm no expert on any, I believe other options would be the more
Java specific remoting APIs - hessian, burlap, flex data services, rmi
and again look at using byte array in the message bean.
3) I didn't look into #2 much and instead use ncml extensively within a
Mule+JMS data distribution system (sources: files, sinks: rdbms, files,
jms queus, monitoring apps). In a sink you can deserialize NcML to
memory like this;
// Read ncml from Mule Message
String ncml = (String)message.getPayload();
InputStream ins = new ByteArrayInputStream(ncml.getBytes());
NetcdfDataset netcdfDataset = NcMLReader.readNcML(ins, null);
from where you can access the netcdfDataset dimensions, attributes and
variables. For low data volumes I find this the best approach as it
provides not only serialization via String type, but also a data type
that can be understood not necessarily using the netcdf api (eg
Javascript xslt/XPath).
lele wrote:
Dear netcdf-ers,
I need your help to write a java applet that receives a netcdf file from a
servlet.
The first problem is that I don't know if netcdf objects are serializable
The second problem (I'm a java newcomer) is that I don't know how a servlet
serializes a NetcdfFile object to send it to the applet.
Can you help me?
Thank you from italy,
Emanuele Lombardi
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