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The Core API of Neo4j-Migrations.
/*
* Copyright 2020-2022 the original author or authors.
*
* 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
*
* https://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 ac.simons.neo4j.migrations.core;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.neo4j.driver.Bookmark;
/**
* Responsible for storing, updating and retrieving the bookmarks of Neo4j's transaction. The original class appeared for
* the first time in Spring Data Neo4j 6 by
* the same author, under the same license.
*
* @author Michael J. Simons
* @soundtrack Metallica - Death Magnetic
* @since 1.3.0
*/
final class BookmarkManager {
private final Set bookmarks = new HashSet<>();
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
private final Lock read = lock.readLock();
private final Lock write = lock.writeLock();
Collection getBookmarks() {
try {
read.lock();
return Collections.unmodifiableSet(new HashSet<>(bookmarks));
} finally {
read.unlock();
}
}
void updateBookmarks(Collection usedBookmarks, Bookmark lastBookmark) {
try {
write.lock();
bookmarks.removeAll(usedBookmarks);
bookmarks.add(lastBookmark);
} finally {
write.unlock();
}
}
}
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