/* * Distributed as part of c3p0 v.0.9.1-pre6 * * Copyright (C) 2005 Machinery For Change, Inc. * * Author: Steve Waldman <swaldman@mchange.com> * * 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 com.mchange.v2.c3p0.stmt;import java.sql.*;import com.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());    }}