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The Java operations layer for the MongoDB Java Driver.
Third parties can wrap this layer to provide custom higher-level APIs
/*
* Copyright 2008-present MongoDB, Inc.
*
* 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.mongodb.internal.connection;
import com.mongodb.lang.Nullable;
import org.bson.BsonDocument;
import org.bson.BsonTimestamp;
import java.util.concurrent.locks.ReentrantLock;
import static com.mongodb.internal.Locks.withInterruptibleLock;
/**
* This class is not part of the public API and may be removed or changed at any time
*/
public class ClusterClock {
private static final String CLUSTER_TIME_KEY = "clusterTime";
private final ReentrantLock lock = new ReentrantLock();
private BsonDocument clusterTime;
public BsonDocument getCurrent() {
return withInterruptibleLock(lock, () -> clusterTime);
}
public BsonTimestamp getClusterTime() {
return withInterruptibleLock(lock, () -> clusterTime != null ? clusterTime.getTimestamp(CLUSTER_TIME_KEY) : null);
}
public void advance(@Nullable final BsonDocument other) {
withInterruptibleLock(lock, () -> this.clusterTime = greaterOf(other));
}
public BsonDocument greaterOf(@Nullable final BsonDocument other) {
return withInterruptibleLock(lock, () -> {
if (other == null) {
return clusterTime;
} else if (clusterTime == null) {
return other;
} else {
return other.getTimestamp(CLUSTER_TIME_KEY).compareTo(clusterTime.getTimestamp(CLUSTER_TIME_KEY)) > 0 ? other : clusterTime;
}
});
}
}
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