@Override
    public IReadWriteStream<ApiRequest> getRequestDataHandler(ApiRequest request,
            IPolicyContext context, Object policyConfiguration) {
        return dataRequestHandler;
    }
@see io.apiman.gateway.engine.policy.IDataPolicy#getRequestDataHandler(io.apiman.gateway.engine.beans.ApiRequest, io.apiman.gateway.engine.policy.IPolicyContext, java.lang.Object)
gateway/engine/core/src/test/java/io/apiman/gateway/engine/util/PassthroughDataPolicy.java