org.neo4j.kernel.impl.locking.ReadOnlyLocks Maven / Gradle / Ivy

Go to download
/*
 * Copyright (c) 2018-2020 "Graph Foundation,"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * This file is part of ONgDB.
 *
 * ONgDB 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 .
 */
/*
 * Copyright (c) 2002-2020 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.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 .
 */
package org.neo4j.kernel.impl.locking;

import org.neo4j.storageengine.api.lock.AcquireLockTimeoutException;
import org.neo4j.storageengine.api.lock.ResourceType;

public class ReadOnlyLocks implements Locks
{
    private static final ReadOnlyClient READ_ONLY_CLIENT = new ReadOnlyClient();

    @Override
    public Client newClient()
    {
        return READ_ONLY_CLIENT;
    }

    @Override
    public void accept( Visitor visitor )
    {
    }

    @Override
    public void close()
    {
    }

    private static class ReadOnlyClient extends NoOpClient
    {
        @Override
        public void acquireShared( LockTracer tracer, ResourceType resourceType, long... resourceIds ) throws AcquireLockTimeoutException
        {
            fail();
        }

        @Override
        public void acquireExclusive( LockTracer tracer, ResourceType resourceType, long... resourceIds ) throws AcquireLockTimeoutException
        {
            fail();
        }

        @Override
        public boolean tryExclusiveLock( ResourceType resourceType, long resourceId )
        {
            fail();
            return false;
        }

        @Override
        public boolean trySharedLock( ResourceType resourceType, long resourceId )
        {
            fail();
            return false;
        }

        @Override
        public void releaseShared( ResourceType resourceType, long... resourceIds )
        {
            fail();
        }

        @Override
        public void releaseExclusive( ResourceType resourceType, long... resourceIds )
        {
            fail();
        }

        private void fail()
        {
            throw new IllegalStateException( "Cannot acquire locks in read only mode" );
        }
    }
}