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BatchingCommitter.java
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BatchingCommitter.java
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/*
* Copyright 2021 Google LLC
*
* 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.google.cloud.pubsublite.internal.wire;
import com.google.api.core.ApiFuture;
import com.google.api.core.SettableApiFuture;
import com.google.cloud.pubsublite.Offset;
import com.google.cloud.pubsublite.internal.AlarmFactory;
import com.google.cloud.pubsublite.internal.CheckedApiException;
import com.google.cloud.pubsublite.internal.MoreApiFutures;
import com.google.cloud.pubsublite.internal.ProxyService;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import java.util.Optional;
import java.util.concurrent.Future;
public class BatchingCommitter extends ProxyService implements Committer {
private final Committer underlying;
@GuardedBy("this")
private SettableApiFuture<Void> currentFuture = SettableApiFuture.create();
@GuardedBy("this")
private Optional<Offset> currentOffset = Optional.empty();
BatchingCommitter(Committer underlying, AlarmFactory alarmFactory) {
super(underlying);
this.underlying = underlying;
Future<?> alarm = alarmFactory.newAlarm(this::flush);
addServices(ApiServiceUtils.autoCloseableAsApiService(() -> alarm.cancel(false)));
}
@Override
public synchronized ApiFuture<Void> commitOffset(Offset offset) {
currentOffset = Optional.of(offset);
return currentFuture;
}
@Override
public void waitUntilEmpty() throws CheckedApiException {
flush();
underlying.waitUntilEmpty();
}
@Override
protected void stop() {
flush();
}
private synchronized void flush() {
if (!currentOffset.isPresent()) {
return;
}
ApiFuture<Void> underlyingFuture = underlying.commitOffset(currentOffset.get());
MoreApiFutures.connectFutures(underlyingFuture, currentFuture);
currentOffset = Optional.empty();
currentFuture = SettableApiFuture.create();
}
}