4.1.M2 deprecates DataChannelFilter

[D Tim Cummings]

I see that 4.1.M2 has deprecated DataChannelFilter. Apparently we should use 
either DataChannelQueryFilter or DataChannelSyncFilter.

I am following the example on 
https://cayenne.apache.org/docs/4.1/cayenne-guide/#lifecycle-events which still 
refers to DataChannelFilter. I would use DataChannelSyncFilter in this example 
but DataChannelSyncFilter does not have an init() method to override so would I 
initialise counter where it gets declared?

Here is the code from the example.
public class CommittedObjectCounter implements DataChannelFilter {

    private ThreadLocal<int[]> counter;

    @Override
    public void init(DataChannel channel) {
        counter = new ThreadLocal<int[]>();
    }

    @Override
    public QueryResponse onQuery(ObjectContext originatingContext, Query query, 
DataChannelFilterChain filterChain) {
        return filterChain.onQuery(originatingContext, query);
    }

    @Override
    public GraphDiff onSync(ObjectContext originatingContext, GraphDiff 
changes, int syncType,
            DataChannelFilterChain filterChain) {

        // init the counter for the current commit
        counter.set(new int[1]);

        try {
            return filterChain.onSync(originatingContext, changes, syncType);
        } finally {

            // process aggregated result and release the counter
            System.out.println("Committed " + counter.get()[0] + " object(s)");
            counter.set(null);
        }
    }

    @PostPersist(entityAnnotations = Tag.class)
    @PostUpdate(entityAnnotations = Tag.class)
    @PostRemove(entityAnnotations = Tag.class)
    void afterCommit(Persistent object) {
        counter.get()[0]++;
    }
}



Regards

Tim

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