01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Scott Ferguson
28: */
29:
30: package com.caucho.webbeans.context;
31:
32: import com.caucho.loader.*;
33: import com.caucho.server.webapp.WebApp;
34: import com.caucho.webbeans.component.*;
35:
36: import javax.servlet.*;
37: import javax.servlet.http.*;
38: import javax.webbeans.*;
39:
40: /**
41: * The singleton scope value
42: */
43: public class SingletonScope extends ScopeContext {
44: private final static EnvironmentLocal<ScopeMap> _localScopeMap = new EnvironmentLocal<ScopeMap>();
45:
46: public <T> T get(ComponentFactory<T> component, boolean create) {
47: ScopeMap map = _localScopeMap.get();
48:
49: if (map != null) {
50: ComponentImpl comp = (ComponentImpl) component;
51:
52: return (T) map.get(comp);
53: } else
54: return null;
55: }
56:
57: public <T> void put(ComponentFactory<T> component, T value) {
58: ScopeMap map;
59:
60: synchronized (this ) {
61: map = _localScopeMap.getLevel();
62:
63: if (map == null) {
64: map = new ScopeMap();
65: _localScopeMap.set(map);
66: }
67: }
68:
69: map.put(component, value);
70: }
71:
72: public <T> void remove(ComponentFactory<T> component) {
73: ScopeMap map = _localScopeMap.getLevel();
74:
75: if (map != null) {
76: synchronized (map) {
77: map.remove(component);
78: }
79: }
80: }
81:
82: public void addDestructor(ComponentImpl comp, Object value) {
83: EnvironmentClassLoader loader = Environment
84: .getEnvironmentClassLoader();
85:
86: if (loader != null) {
87: DestructionListener listener = (DestructionListener) loader
88: .getAttribute("caucho.destroy");
89:
90: if (listener == null) {
91: listener = new DestructionListener();
92: loader.setAttribute("caucho.destroy", listener);
93: loader.addListener(listener);
94: }
95:
96: listener.addValue(comp, value);
97: }
98: }
99: }
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