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TimeoutGuard.java
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TimeoutGuard.java
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/*
* 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/>.
*/
package org.neo4j.kernel.guard;
import java.time.Clock;
import java.util.function.Supplier;
import org.neo4j.kernel.impl.api.KernelStatement;
import org.neo4j.kernel.impl.api.KernelTransactionImplementation;
import org.neo4j.logging.Log;
public class TimeoutGuard implements Guard
{
private final Log log;
private Clock clock;
public TimeoutGuard( Clock clock, final Log log )
{
this.log = log;
this.clock = clock;
}
@Override
public void check( KernelStatement statement )
{
check( maxStatementCompletionTimeSupplier( statement ), "Statement timeout." );
check( statement.getTransaction() );
}
private void check (KernelTransactionImplementation transaction)
{
check( maxTransactionCompletionTimeSupplier( transaction ), "Transaction timeout." );
}
private void check( Supplier<Long> completionTimeSupplier, String timeoutDescription )
{
long now = clock.millis();
long completionTime = completionTimeSupplier.get();
if ( completionTime < now )
{
final long overtime = now - completionTime;
String message = timeoutDescription + " (Overtime: " + overtime + " ms).";
log.warn( message );
throw new GuardTimeoutException(message, overtime );
}
}
private static Supplier<Long> maxTransactionCompletionTimeSupplier( KernelTransactionImplementation transaction )
{
return () -> getMaxTransactionCompletionTime( transaction );
}
private static Supplier<Long> maxStatementCompletionTimeSupplier( KernelStatement statement )
{
return () -> getMaxStatementCompletionTime( statement );
}
private static long getMaxStatementCompletionTime( KernelStatement statement )
{
return statement.startTime() + statement.timeout();
}
private static long getMaxTransactionCompletionTime( KernelTransactionImplementation transaction )
{
return transaction.startTime() + transaction.timeout();
}
}