/*
* Copyright 2023 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.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.UiThread;
import androidx.annotation.VisibleForTesting;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
/** Utility for time data source. */
class EpochTimePlatformDataSource {
@NonNull private final MainThreadExecutor mExecutor = new MainThreadExecutor();
@NonNull final List<DynamicTypeValueReceiverWithPreUpdate<Instant>> mConsumerToTimeCallback =
new ArrayList<>();
@NonNull private final Supplier<Instant> mClock;
@Nullable private final PlatformTimeUpdateNotifier mUpdateNotifier;
EpochTimePlatformDataSource(
@NonNull Supplier<Instant> clock,
@Nullable PlatformTimeUpdateNotifier platformTimeUpdateNotifier) {
this.mClock = clock;
this.mUpdateNotifier = platformTimeUpdateNotifier;
}
@UiThread
void registerForData(DynamicTypeValueReceiverWithPreUpdate<Instant> consumer) {
if (mConsumerToTimeCallback.isEmpty() && mUpdateNotifier != null) {
mUpdateNotifier.setReceiver(mExecutor, this::tick);
}
mConsumerToTimeCallback.add(consumer);
}
@UiThread
void unregisterForData(DynamicTypeValueReceiverWithPreUpdate<Instant> consumer) {
mConsumerToTimeCallback.remove(consumer);
if (mConsumerToTimeCallback.isEmpty() && mUpdateNotifier != null) {
mUpdateNotifier.clearReceiver();
}
}
/**
* Updates all registered consumers with the new time.
*/
@SuppressWarnings("NullAway")
private void tick() {
mConsumerToTimeCallback.forEach(
DynamicTypeValueReceiverWithPreUpdate::onPreUpdate);
Instant currentTime = mClock.get();
mConsumerToTimeCallback.forEach(c -> c.onData(currentTime));
}
@VisibleForTesting
int getRegisterConsumersCount() {
return mConsumerToTimeCallback.size();
}
}