001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.jca;
030:
031: import com.caucho.log.Log;
032: import com.caucho.util.L10N;
033:
034: import java.lang.ref.SoftReference;
035: import java.util.ArrayList;
036: import java.util.logging.Logger;
037:
038: /**
039: * Manages the connections for a thread. Needed to support the
040: * "cached" connection, i.e. elisting only when work is actually done.
041: */
042: public class ThreadConnectionManager {
043: private static final L10N L = new L10N(
044: ThreadConnectionManager.class);
045: private static final Logger log = Log
046: .open(ThreadConnectionManager.class);
047:
048: private static final ThreadLocal<ThreadConnectionManager> _threadManager = new ThreadLocal<ThreadConnectionManager>();
049:
050: private ArrayList<SoftReference<PoolItem>> _activeConnections = new ArrayList<SoftReference<PoolItem>>();
051:
052: /**
053: * Returns the manager for the current thread.
054: */
055: public static ThreadConnectionManager getThreadManager() {
056: return _threadManager.get();
057: }
058:
059: /**
060: * Sets the manager for the current thread.
061: */
062: public static void setThreadManager(ThreadConnectionManager manager) {
063: _threadManager.set(manager);
064: }
065:
066: /**
067: * Returns the manager for the current thread, creating if necessary.
068: */
069: public static ThreadConnectionManager createThreadManager() {
070: ThreadConnectionManager cm = _threadManager.get();
071:
072: if (cm == null) {
073: cm = new ThreadConnectionManager();
074: _threadManager.set(cm);
075: }
076:
077: return cm;
078: }
079:
080: /**
081: * Adds a pooled connection to the current thread.
082: */
083: public static void addConnection(PoolItem conn) {
084: createThreadManager().add(conn);
085: }
086:
087: /**
088: * Removes a pooled connection from the current thread.
089: */
090: public static void removeConnection(PoolItem conn) {
091: createThreadManager().remove(conn);
092: }
093:
094: /**
095: * Adds the connection.
096: */
097: private void add(PoolItem conn) {
098: _activeConnections.add(new SoftReference<PoolItem>(conn));
099: }
100:
101: /**
102: * Removes the connection.
103: */
104: private void remove(PoolItem conn) {
105: for (int i = _activeConnections.size() - 1; i >= 0; i--) {
106: PoolItem aConn = _activeConnections.get(i).get();
107:
108: if (aConn == null || aConn == conn)
109: _activeConnections.remove(i);
110: }
111: }
112: }
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