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AssetSubscriptionProvider.java
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AssetSubscriptionProvider.java
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/*
* Copyright (c) 2021 Fraunhofer IOSB, eine rechtlich nicht selbstaendige
* Einrichtung der Fraunhofer-Gesellschaft zur Foerderung der angewandten
* Forschung e.V.
* 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
* http://www.apache.org/licenses/LICENSE-2.0
* 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.
*/
package de.fraunhofer.iosb.ilt.faaast.service.assetconnection;
/**
* An AssetSubscriptionProvider provides methods to subscribe to an asset and provide events about new data values.
*/
public interface AssetSubscriptionProvider extends AssetProvider {
/**
* Add a NewDataListener to be notified when new data is received from the asset.
*
* @param listener listener to add
* @throws AssetConnectionException if adding listener fails
*/
public void addNewDataListener(NewDataListener listener) throws AssetConnectionException;
/**
* Remove NewDataListener if present, otherwise to nothing.
*
* @param listener listener to remove
* @throws AssetConnectionException if removinglistener fails
*/
public void removeNewDataListener(NewDataListener listener) throws AssetConnectionException;
}