01: /*
02: * Distributed as part of c3p0 v.0.9.1.2
03: *
04: * Copyright (C) 2005 Machinery For Change, Inc.
05: *
06: * Author: Steve Waldman <swaldman@mchange.com>
07: *
08: * This library is free software; you can redistribute it and/or modify
09: * it under the terms of the GNU Lesser General Public License version 2.1, as
10: * published by the Free Software Foundation.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public License
18: * along with this software; see the file LICENSE. If not, write to the
19: * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20: * Boston, MA 02111-1307, USA.
21: */
22:
23: package com.mchange.v2.c3p0.stmt;
24:
25: import java.sql.*;
26: import com.mchange.v2.async.AsynchronousRunner;
27:
28: public final class PerConnectionMaxOnlyStatementCache extends
29: GooGooStatementCache {
30: //MT: protected by this' lock
31: int max_statements_per_connection;
32: DeathmarchConnectionStatementManager dcsm;
33:
34: public PerConnectionMaxOnlyStatementCache(
35: AsynchronousRunner blockingTaskAsyncRunner,
36: int max_statements_per_connection) {
37: super (blockingTaskAsyncRunner);
38: this .max_statements_per_connection = max_statements_per_connection;
39: }
40:
41: //called only in parent's constructor
42: protected ConnectionStatementManager createConnectionStatementManager() {
43: return (this .dcsm = new DeathmarchConnectionStatementManager());
44: }
45:
46: //called by parent only with this' lock
47: void addStatementToDeathmarches(Object pstmt,
48: Connection physicalConnection) {
49: dcsm.getDeathmarch(physicalConnection).deathmarchStatement(
50: pstmt);
51: }
52:
53: void removeStatementFromDeathmarches(Object pstmt,
54: Connection physicalConnection) {
55: dcsm.getDeathmarch(physicalConnection).undeathmarchStatement(
56: pstmt);
57: }
58:
59: boolean prepareAssimilateNewStatement(Connection pcon) {
60: int cxn_stmt_count = dcsm.getNumStatementsForConnection(pcon);
61: return (cxn_stmt_count < max_statements_per_connection || (cxn_stmt_count == max_statements_per_connection && dcsm
62: .getDeathmarch(pcon).cullNext()));
63: }
64: }
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