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/*
* Copyright (C) 2019 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.settings.panel;
import android.net.Uri;
import androidx.slice.Slice;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
/**
* Helper class to isolate the work tracking all of the {@link Slice Slices} being loaded.
* <p>
* Uses a {@link CountDownLatch} and a {@link Set} of Slices to track how many
* Slices have been loaded. A Slice can only be counted as being loaded a single time, even
* when they get updated later.
* <p>
* To use the class, pass the number of expected Slices to load into the constructor. For
* every Slice that loads, call {@link #markSliceLoaded(Uri)} with the corresponding
* {@link Uri}. Then check if all of the Slices have loaded with
* {@link #isPanelReadyToLoad()}, which will return {@code true} the first time after all
* Slices have loaded.
*/
public class PanelSlicesLoaderCountdownLatch {
private final Set<Uri> mLoadedSlices;
private final CountDownLatch mCountDownLatch;
private boolean slicesReadyToLoad = false;
public PanelSlicesLoaderCountdownLatch(int countdownSize) {
mLoadedSlices = new HashSet<>();
mCountDownLatch = new CountDownLatch(countdownSize);
}
/**
* Checks if the {@param sliceUri} has been loaded: if not, then decrement the countdown
* latch, and if so, then do nothing.
*/
public void markSliceLoaded(Uri sliceUri) {
if (mLoadedSlices.contains(sliceUri)) {
return;
}
mLoadedSlices.add(sliceUri);
mCountDownLatch.countDown();
}
/**
* @return {@code true} if the Slice has already been loaded.
*/
public boolean isSliceLoaded(Uri uri) {
return mLoadedSlices.contains(uri);
}
/**
* @return {@code true} when all Slices have loaded, and the Panel has not yet been loaded.
*/
public boolean isPanelReadyToLoad() {
/**
* Use {@link slicesReadyToLoad} to track whether or not the Panel has been loaded. We
* only want to animate the Panel a single time.
*/
if ((mCountDownLatch.getCount() == 0) && !slicesReadyToLoad) {
slicesReadyToLoad = true;
return true;
}
return false;
}
}
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