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/*
* Copyright (C) 2022 The Android Open Source Project
*
* 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 com.android.systemui.util.service;
/**
* The {@link Observer} interface specifies an entity which listeners
* can be informed of changes to the source, which will require updating. Note that this deals
* with changes to the source itself, not content which will be updated through the interface.
*/
public interface Observer {
/**
* Callback for receiving updates from the {@link Observer}.
*/
interface Callback {
/**
* Invoked when the source has changed.
*/
void onSourceChanged();
}
/**
* Adds a callback to receive future updates from the {@link Observer}.
*/
void addCallback(Callback callback);
/**
* Removes a callback from receiving further updates.
* @param callback
*/
void removeCallback(Callback callback);
}
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