Examples of org.apache.openjpa.slice.DistributionPolicy.distribute()

org.apache.openjpa.slice.DistributionPolicy.distribute()

Gets the name of the target slice where the given newly persistent or the detached, to-be-merged instance will be stored.
If the current state of the given instance is sufficient to determine the target slice, return null. In that case, the runtime will callback this method again before the instance being flushed to the datastore. By then, the policy must be able to determine the target slice. @param pc The newly persistent or to-be-merged object. @param slices list of names of the active slices. The ordering of the list is either explicit openjpa.slice.Names property or implicit i.e. alphabetic order of available identifiers if openjpa.slice.Names is unspecified. @param context the generic persistence context managing the giveninstance. @return identifier of the slice. This name must match one of thegiven slice names. @see DistributedConfiguration#getActiveSliceNames()


    private String assignSlice(OpenJPAStateManager sm) {
        Object pc = sm.getPersistenceCapable();
        DistributionPolicy policy = _conf.getDistributionPolicyInstance();
        List<String> sliceNames = _conf.getActiveSliceNames();
        String slice =policy.distribute(pc, sliceNames, getContext());
        if (!sliceNames.contains(slice)) {
            throw new UserException(_loc.get("bad-policy-slice", new Object[] {
                    policy.getClass().getName(), slice, pc, sliceNames }));
        }
        sm.setImplData(slice, true);

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