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Shared base functionality for implementing engines for the 51Degrees Pipeline API
/* *********************************************************************
* This Original Work is copyright of 51 Degrees Mobile Experts Limited.
* Copyright 2023 51 Degrees Mobile Experts Limited, Davidson House,
* Forbury Square, Reading, Berkshire, United Kingdom RG1 3EU.
*
* This Original Work is licensed under the European Union Public Licence
* (EUPL) v.1.2 and is subject to its terms as set out below.
*
* If a copy of the EUPL was not distributed with this file, You can obtain
* one at https://opensource.org/licenses/EUPL-1.2.
*
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* amended by the European Commission) shall be deemed incompatible for
* the purposes of the Work and the provisions of the compatibility
* clause in Article 5 of the EUPL shall not apply.
*
* If using the Work as, or as part of, a network application, by
* including the attribution notice(s) required under Article 5 of the EUPL
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package fiftyone.pipeline.engines.trackers;
import fiftyone.pipeline.core.data.FlowData;
/**
* Represents a 'tracker'.
* A tracker is a data structure that stores meta-data relating to a key derived
* from a given {@link FlowData} instance.
* This meta-data is used to determine if the {@link FlowData} should continue
* to be processed or not.
*
* The details of key creation and the specifics of the meta-data are determined
* by the tracker implementation.
*
* As an example, a tracker could create a key using the source IP address from
* the {@link FlowData} evidence and use the associated meta-data to store a
* count of the number of times a given source IP has been seen.
*/
public interface Tracker {
/**
* Track the specified {@link FlowData} instance.
* If the key created from the data does not yet exist in the tracker then
* it will be added. If it does already exist then the meta-data will be
* updated according to the tracker implementation's logic.
* @param flowData the {@link FlowData} to track
* @return true if further processing is allowed by the tracker's logic,
* false otherwise
*/
boolean track(FlowData flowData);
}