Re: Speeding up loading snapshots

On Jan 25, 2011, at 7:11 PM, Klaus Wuestefeld wrote:

> the TCOB1 principle:
> http://www.prevayler.org/old_wiki/ThereCanOnlyBeOne.html

Yeah, I don't really like that principle. I prefere using the same class that implements Externalizable and using a static serialVersionUID, where I add a local version to my instance and load/refactor the instance accordingly for what is required. Works great with logs, snaphots and what not. And I don't have to go change my class names.

Something like this:

public class MyClass {
  private static final long serialVersionUID = 1l;

  @Override
  public void writeExternal(ObjectOutput objectOutput) throws IOException {
    objectOutput.writeInt(2); // local object version
    objectOutput.write...
  }

  @Override
  public void readExternal(ObjectInput objectInput) throws IOException, ClassNotFoundException {
    int version = objectInput.readInt();
    if (version == 1) {
      ... =  objectInput.read...
    } else if (version == 2) {
      ... =  objectInput.read...
    } else {
      throw new UnsupportedLocalVersion(version, 1, 2);
    }
  }



	karl

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