* Copyright 2014 dc-square GmbH
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
for the payload of this $SYS topic. The supplier will be called every time the broker publishes on the $SYS topics.
If the payload is static or if you need to cache, you can consider using the utility methods in the
of this $SYS topics