io.logspace.jvm.agent.shaded.mchange.v2.c3p0.stmt.DoubleMaxStatementCache Maven / Gradle / Ivy
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/*
* Distributed as part of c3p0 v.0.9.1.1
*
* Copyright (C) 2005 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1, as
* published by the Free Software Foundation.
*
* This software 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software; see the file LICENSE. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
package io.logspace.jvm.agent.shaded.mchange.v2.c3p0.stmt;
import java.sql.*;
import io.logspace.jvm.agent.shaded.mchange.v2.async.AsynchronousRunner;
public final class DoubleMaxStatementCache extends GooGooStatementCache
{
//MT: protected by this' lock
int max_statements;
Deathmarch globalDeathmarch = new Deathmarch();
int max_statements_per_connection;
DeathmarchConnectionStatementManager dcsm;
public DoubleMaxStatementCache(AsynchronousRunner blockingTaskAsyncRunner, int max_statements, int max_statements_per_connection)
{
super( blockingTaskAsyncRunner );
this.max_statements = max_statements;
this.max_statements_per_connection = max_statements_per_connection;
}
//called only in parent's constructor
protected ConnectionStatementManager createConnectionStatementManager()
{ return (this.dcsm = new DeathmarchConnectionStatementManager()); }
//called by parent only with this' lock
void addStatementToDeathmarches( Object pstmt, Connection physicalConnection )
{
globalDeathmarch.deathmarchStatement( pstmt );
dcsm.getDeathmarch( physicalConnection ).deathmarchStatement( pstmt );
}
void removeStatementFromDeathmarches( Object pstmt, Connection physicalConnection )
{
globalDeathmarch.undeathmarchStatement( pstmt );
dcsm.getDeathmarch( physicalConnection ).undeathmarchStatement( pstmt );
}
boolean prepareAssimilateNewStatement(Connection pcon)
{
int cxn_stmt_count = dcsm.getNumStatementsForConnection( pcon );
if (cxn_stmt_count < max_statements_per_connection) //okay... we can cache another for the connection, but how 'bout globally?
{
int global_size = this.countCachedStatements();
return ( global_size < max_statements || (global_size == max_statements && globalDeathmarch.cullNext()) );
}
else //we can only cache if we can clear one from the Connection (which implies clearing one globally, so we needn't check max_statements)
return (cxn_stmt_count == max_statements_per_connection && dcsm.getDeathmarch( pcon ).cullNext());
}
}