Why the entry processor implements PortableObject

Hi all:
I've been reading 'Oracle Coherence 3.5' Aleksandar Seovic and processor of entry of learning. I noticed that, in his example on EntryProcessor, the test class implements POFObject. That bring up a few questions:

1. Why is must a processor of entry class implement PortableObject?
2. how to override the readExternal/writeExternal methods methods - given the fact that we need not have instance members in this class?
3. how to apply the processor to enter test code?

I did my own experiement:

-first of all, I've implemented readExternal/writeExternal in this way methods:
     @Override
     public void readExternal(PofReader reader) throws IOException {
          reader.readRemainder();
     }

     @Override
     public void writeExternal(PofWriter writer) throws IOException {
          writer.writeRemainder(null);
     }
The test code throws the exception as:
(Wrapped) java.io.IOException: (Wrapped) user type POF stream terminated
     at com.tangosol.util.Base.ensureRuntimeException(Base.java:288)
     at com.tangosol.util.Base.ensureRuntimeException(Base.java:269)
....
After I commented on the body of readExternal/writeExternal, no error methods, not more, but this is not the method of 'process' is entered. That's how I used the class:
EntryProcessor agent = new TestProcessor();
cache.invokeAll(filter, agent)
Please advise, thank you!
John

1. because entry processor will run on the other node of storage which can and will be on different Java virtual machines.
2. If you do not need to carry additional information, your methods, writeExternal and readExternal can be just a dummy method, I thought. readReminder/writeReminder bad not that used to the PofSerializer inside PortableObject.

3. it might be your logical filter end with no entry matching your filter so no entryprocess got inovked at all.

Tags: Fusion Middleware

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