DynamicDataSourceNode.java
/*
* Copyright 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 androidx.wear.protolayout.expression.pipeline;
import androidx.annotation.UiThread;
/**
* Data source node within a dynamic data pipeline. This node type should push data into the
* pipeline, either once when the pipeline is inited, or periodically from its data source (e.g. for
* sensor nodes).
*
* @param <T> The type of data this node emits.
*/
interface DynamicDataSourceNode<T> extends DynamicDataNode<T> {
/**
* Called on all source nodes before {@link DynamicDataSourceNode#init()} is called on any node.
* This should generally only call {@link DynamicTypeValueReceiver#onPreUpdate()} on all
* downstream nodes.
*/
@UiThread
void preInit();
/**
* Initialize this node. This should cause it to bind to any data sources, and emit its first
* value.
*/
@UiThread
void init();
/** Destroy this node. This should cause it to unbind from any data sources. */
@UiThread
void destroy();
}