001: /*
002: License $Id: JoServletModel.java,v 1.9 2004/04/16 01:30:04 hendriks73 Exp $
003:
004: Copyright (c) 2001-2005 tagtraum industries.
005:
006: LGPL
007: ====
008:
009: jo! is free software; you can redistribute it and/or
010: modify it under the terms of the GNU Lesser General Public
011: License as published by the Free Software Foundation; either
012: version 2.1 of the License, or (at your option) any later version.
013:
014: jo! is distributed in the hope that it will be useful,
015: but WITHOUT ANY WARRANTY; without even the implied warrmanty of
016: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017: Lesser General Public License for more details.
018:
019: You should have received a copy of the GNU Lesser General Public
020: License along with this library; if not, write to the Free Software
021: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
022:
023: For LGPL see <http://www.fsf.org/copyleft/lesser.txt>
024:
025:
026: Sun license
027: ===========
028:
029: This release contains software by Sun Microsystems. Therefore
030: the following conditions have to be met, too. They apply to the
031: files
032:
033: - lib/mail.jar
034: - lib/activation.jar
035: - lib/jsse.jar
036: - lib/jcert.jar
037: - lib/jaxp.jar
038: - lib/crimson.jar
039: - lib/servlet.jar
040: - lib/jnet.jar
041: - lib/jaas.jar
042: - lib/jaasmod.jar
043:
044: contained in this release.
045:
046: a. Licensee may not modify the Java Platform
047: Interface (JPI, identified as classes contained within the javax
048: package or any subpackages of the javax package), by creating additional
049: classes within the JPI or otherwise causing the addition to or modification
050: of the classes in the JPI. In the event that Licensee creates any
051: Java-related API and distribute such API to others for applet or
052: application development, you must promptly publish broadly, an accurate
053: specification for such API for free use by all developers of Java-based
054: software.
055:
056: b. Software is confidential copyrighted information of Sun and
057: title to all copies is retained by Sun and/or its licensors. Licensee
058: shall not modify, decompile, disassemble, decrypt, extract, or otherwise
059: reverse engineer Software. Software may not be leased, assigned, or
060: sublicensed, in whole or in part. Software is not designed or intended
061: for use in on-line control of aircraft, air traffic, aircraft navigation
062: or aircraft communications; or in the design, construction, operation or
063: maintenance of any nuclear facility. Licensee warrants that it will not
064: use or redistribute the Software for such purposes.
065:
066: c. Software is provided "AS IS," without a warranty
067: of any kind. ALL EXPRESS OR IMPLIED REPRESENTATIONS AND WARRANTIES,
068: INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
069: PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED.
070:
071: d. This License is effective until terminated. Licensee may
072: terminate this License at any time by destroying all copies of Software.
073: This License will terminate immediately without notice from Sun if Licensee
074: fails to comply with any provision of this License. Upon such termination,
075: Licensee must destroy all copies of Software.
076:
077: e. Software, including technical data, is subject to U.S.
078: export control laws, including the U.S. Export Administration Act and its
079: associated regulations, and may be subject to export or import regulations
080: in other countries. Licensee agrees to comply strictly with all such
081: regulations and acknowledges that it has the responsibility to obtain
082: licenses to export, re-export, or import Software. Software may not be
083: downloaded, or otherwise exported or re-exported (i) into, or to a national
084: or resident of, Cuba, Iraq, Iran, North Korea, Libya, Sudan, Syria or any
085: country to which the U.S. has embargoed goods; or (ii) to anyone on the
086: U.S. Treasury Department's list of Specially Designated Nations or the U.S.
087: Commerce Department's Table of Denial Orders.
088:
089:
090: Feedback
091: ========
092:
093: We encourage your feedback and suggestions and want to use your feedback to
094: improve the Software. Send all such feedback to:
095: <feedback@tagtraum.com>
096:
097: For more information on tagtraum industries and jo!
098: please see <http://www.tagtraum.com/>.
099:
100:
101: */
102: package com.tagtraum.jo;
103:
104: import com.tagtraum.framework.recycler.Recycler;
105: import com.tagtraum.framework.util.FactoryException;
106: import com.tagtraum.jo.util.ServletClassLoader;
107:
108: import javax.servlet.Servlet;
109: import javax.servlet.ServletException;
110: import javax.servlet.SingleThreadModel;
111: import java.io.IOException;
112: import java.util.ResourceBundle;
113:
114: /**
115: * Encapsulates the servlet instance or instances.
116: *
117: * @author <a href="mailto:hs@tagtraum.com">Hendrik Schreiber</a>
118: * @version 1.1beta1 $Id: JoServletModel.java,v 1.9 2004/04/16 01:30:04 hendriks73 Exp $
119: */
120: public class JoServletModel extends JoAbstractModel implements
121: I_JoServletModel, I_JoWebAppElement, C_Jo {
122:
123: /**
124: * Source-Version
125: */
126: public static String vcid = "$Id: JoServletModel.java,v 1.9 2004/04/16 01:30:04 hendriks73 Exp $";
127: private static ResourceBundle localStrings = ResourceBundle
128: .getBundle("com.tagtraum.jo.localStrings");
129:
130: /**
131: * Returns a servlet instance.
132: */
133: protected Servlet getServletInstance() throws ServletException,
134: IOException {
135: // enter synchronized-Block only, if no instance exists yet.
136: try {
137: if (servlet != null
138: && !(getServletContextPeer().isAutoReloadServlets() && ((ServletClassLoader) getClassLoader())
139: .lastModified(getServletClass()) != getLastModified())) {
140: return servlet;
141: }
142: } catch (ClassNotFoundException cnfe) {
143: // ignore - will be handled later
144: }
145: synchronized (this ) {
146: try {
147: boolean needsReload = getServletContextPeer()
148: .isAutoReloadServlets();
149: if (needsReload) {
150: long newClassLastModified = ((ServletClassLoader) getClassLoader())
151: .lastModified(getServletClass());
152: needsReload = newClassLastModified != getLastModified();
153: setLastModified(newClassLastModified);
154: }
155: // make sure that there is still no instance
156: if (servlet != null && !needsReload)
157: return servlet;
158: checkUnavailable();
159: if (needsReload) {
160: // log
161: getServletConfig().getServletContext().log(
162: localStrings
163: .getString("resource_needs_reload")
164: + getName());
165: // destroy all servlets that were loaded with the old classloader.
166: // maybe this should signal to the webapp, that it needs to be restarted
167: // instead of just replacing the servletclassloader, maybe the whole
168: // webapp classloader should be replaced (rik)
169: try {
170: // trick the servicecall count
171: serviceMethodCalls--;
172: unload();
173: } finally {
174: serviceMethodCalls++;
175: }
176: setClassLoader((ServletClassLoader) ((ServletClassLoader) getClassLoader())
177: .clone());
178: }
179: Servlet servletInstance;
180: waitForAvailableInstance();
181: servletInstance = (Servlet) Recycler.getRecycler().get(
182: getServletClassName(), getClassLoader());
183: servletInstance.init(getServletConfig());
184: setServletClass(servletInstance.getClass());
185: if (servletInstance instanceof SingleThreadModel) {
186: setActiveInstances(getActiveInstances() + 1);
187: } else {
188: servlet = servletInstance;
189: }
190: setLoaded(true);
191: return servletInstance;
192: } catch (FactoryException fe) {
193: throw new ServletException(fe.toString());
194: } catch (CloneNotSupportedException cnse) {
195: // will not happen
196: cnse.printStackTrace();
197: throw new ServletException(cnse.toString());
198: } catch (ClassNotFoundException cnfe) {
199: // will not happen
200: cnfe.printStackTrace();
201: throw new ServletException(cnfe.toString());
202: }
203: }
204: }
205:
206: /**
207: * String Representation of a ServletModel
208: */
209: public String toString() {
210: return "Name: " + getName() + ", Classname: "
211: + getServletClassName() + ", " + "Loaded: "
212: + isLoaded() + ", " + "MaxActiveInstances: "
213: + getMaxActiveInstances() + ", " + "DestroyTimeout: "
214: + getDestroyTimeout() + "ms , " + "ServletConfig: "
215: + getServletConfig().toString();
216: }
217:
218: }
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