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CoreAPIAvailabilityGuard.java
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CoreAPIAvailabilityGuard.java
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package org.neo4j.kernel.impl.coreapi;
/*
* Copyright (c) 2002-2016 "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/>.
*/
import org.neo4j.graphdb.DatabaseShutdownException;
import org.neo4j.kernel.AvailabilityGuard;
/**
* This is a simple wrapper around {@link AvailabilityGuard} that augments its behavior to match how
* availability errors and timeouts are handled in the Core API.
*/
public class CoreAPIAvailabilityGuard
{
private final AvailabilityGuard guard;
private final long timeout;
public CoreAPIAvailabilityGuard( AvailabilityGuard guard, long timeout )
{
this.guard = guard;
this.timeout = timeout;
}
public boolean isAvailable( long timeoutMillis )
{
return guard.isAvailable( timeoutMillis );
}
public void assertDatabaseAvailable()
{
try
{
guard.await( timeout );
}
catch ( AvailabilityGuard.UnavailableException e )
{
if( guard.isShutdown())
{
throw new DatabaseShutdownException();
}
throw new org.neo4j.graphdb.TransactionFailureException( e.getMessage() );
}
}
}