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StatementLocks.java
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StatementLocks.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.locking;
import java.util.stream.Stream;
import org.neo4j.kernel.impl.api.KernelStatement;
/**
* Component used by {@link KernelStatement} to acquire {@link #pessimistic() pessimistic} and
* {@link #optimistic() optimistic} locks.
*/
public interface StatementLocks extends AutoCloseable
{
/**
* Get {@link Locks.Client} responsible for pessimistic locks. Such locks will be grabbed right away.
*
* @return the locks client to serve pessimistic locks.
*/
Locks.Client pessimistic();
/**
* Get {@link Locks.Client} responsible for optimistic locks. Such locks could potentially be grabbed later at
* commit time.
*
* @return the locks client to serve optimistic locks.
*/
Locks.Client optimistic();
/**
* Prepare the underlying {@link Locks.Client client}(s) for commit. This will grab all locks that have
* previously been taken {@link #optimistic() optimistically}.
*/
void prepareForCommit();
/**
* Stop the underlying {@link Locks.Client client}(s).
*/
void stop();
/**
* Close the underlying {@link Locks.Client client}(s).
*/
@Override
void close();
/**
* List the locks held by this transaction.
*
* This method is invoked by concurrent threads in order to inspect the lock state in this transaction.
*
* @return the locks held by this transaction.
*/
Stream<? extends ActiveLock> activeLocks();
}