Author: markt
Date: Thu Nov 5 22:08:30 2009
New Revision: 833211
URL: http://svn.apache.org/viewvc?rev=833211&view=rev
Log:
Apply Filip's suggestion to improve concurrency
Modified:
tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
Modified: tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java?rev=833211&r1=833210&r2=833211&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
(original)
+++ tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java Thu Nov
5 22:08:30 2009
@@ -1280,84 +1280,48 @@
* @exception ClassNotFoundException if the class was not found
*/
@Override
- public synchronized Class<?> loadClass(String name, boolean resolve)
+ public Class<?> loadClass(String name, boolean resolve)
throws ClassNotFoundException {
- if (log.isDebugEnabled())
- log.debug("loadClass(" + name + ", " + resolve + ")");
- Class<?> clazz = null;
-
- // Log access to stopped classloader
- if (!started) {
- try {
- throw new IllegalStateException();
- } catch (IllegalStateException e) {
- log.info(sm.getString("webappClassLoader.stopped", name), e);
- }
- }
-
- // (0) Check our previously loaded local class cache
- clazz = findLoadedClass0(name);
- if (clazz != null) {
- if (log.isDebugEnabled())
- log.debug(" Returning class from cache");
- if (resolve)
- resolveClass(clazz);
- return (clazz);
- }
-
- // (0.1) Check our previously loaded class cache
- clazz = findLoadedClass(name);
- if (clazz != null) {
+ synchronized (name.intern()) {
if (log.isDebugEnabled())
- log.debug(" Returning class from cache");
- if (resolve)
- resolveClass(clazz);
- return (clazz);
- }
-
- // (0.2) Try loading the class with the system class loader, to prevent
- // the webapp from overriding J2SE classes
- try {
- clazz = system.loadClass(name);
+ log.debug("loadClass(" + name + ", " + resolve + ")");
+ Class<?> clazz = null;
+
+ // Log access to stopped classloader
+ if (!started) {
+ try {
+ throw new IllegalStateException();
+ } catch (IllegalStateException e) {
+ log.info(sm.getString("webappClassLoader.stopped", name),
e);
+ }
+ }
+
+ // (0) Check our previously loaded local class cache
+ clazz = findLoadedClass0(name);
if (clazz != null) {
+ if (log.isDebugEnabled())
+ log.debug(" Returning class from cache");
if (resolve)
resolveClass(clazz);
return (clazz);
}
- } catch (ClassNotFoundException e) {
- // Ignore
- }
-
- // (0.5) Permission to access this class when using a SecurityManager
- if (securityManager != null) {
- int i = name.lastIndexOf('.');
- if (i >= 0) {
- try {
- securityManager.checkPackageAccess(name.substring(0,i));
- } catch (SecurityException se) {
- String error = "Security Violation, attempt to use " +
- "Restricted Class: " + name;
- log.info(error, se);
- throw new ClassNotFoundException(error, se);
- }
+
+ // (0.1) Check our previously loaded class cache
+ clazz = findLoadedClass(name);
+ if (clazz != null) {
+ if (log.isDebugEnabled())
+ log.debug(" Returning class from cache");
+ if (resolve)
+ resolveClass(clazz);
+ return (clazz);
}
- }
-
- boolean delegateLoad = delegate || filter(name);
-
- // (1) Delegate to our parent if requested
- if (delegateLoad) {
- if (log.isDebugEnabled())
- log.debug(" Delegating to parent classloader1 " + parent);
- ClassLoader loader = parent;
- if (loader == null)
- loader = system;
+
+ // (0.2) Try loading the class with the system class loader, to
prevent
+ // the webapp from overriding J2SE classes
try {
- clazz = Class.forName(name, false, loader);
+ clazz = system.loadClass(name);
if (clazz != null) {
- if (log.isDebugEnabled())
- log.debug(" Loading class from parent");
if (resolve)
resolveClass(clazz);
return (clazz);
@@ -1365,36 +1329,53 @@
} catch (ClassNotFoundException e) {
// Ignore
}
- }
-
- // (2) Search local repositories
- if (log.isDebugEnabled())
- log.debug(" Searching local repositories");
- try {
- clazz = findClass(name);
- if (clazz != null) {
+
+ // (0.5) Permission to access this class when using a
SecurityManager
+ if (securityManager != null) {
+ int i = name.lastIndexOf('.');
+ if (i >= 0) {
+ try {
+
securityManager.checkPackageAccess(name.substring(0,i));
+ } catch (SecurityException se) {
+ String error = "Security Violation, attempt to use " +
+ "Restricted Class: " + name;
+ log.info(error, se);
+ throw new ClassNotFoundException(error, se);
+ }
+ }
+ }
+
+ boolean delegateLoad = delegate || filter(name);
+
+ // (1) Delegate to our parent if requested
+ if (delegateLoad) {
if (log.isDebugEnabled())
- log.debug(" Loading class from local repository");
- if (resolve)
- resolveClass(clazz);
- return (clazz);
+ log.debug(" Delegating to parent classloader1 " + parent);
+ ClassLoader loader = parent;
+ if (loader == null)
+ loader = system;
+ try {
+ clazz = Class.forName(name, false, loader);
+ if (clazz != null) {
+ if (log.isDebugEnabled())
+ log.debug(" Loading class from parent");
+ if (resolve)
+ resolveClass(clazz);
+ return (clazz);
+ }
+ } catch (ClassNotFoundException e) {
+ // Ignore
+ }
}
- } catch (ClassNotFoundException e) {
- // Ignore
- }
-
- // (3) Delegate to parent unconditionally
- if (!delegateLoad) {
+
+ // (2) Search local repositories
if (log.isDebugEnabled())
- log.debug(" Delegating to parent classloader at end: " +
parent);
- ClassLoader loader = parent;
- if (loader == null)
- loader = system;
+ log.debug(" Searching local repositories");
try {
- clazz = Class.forName(name, false, loader);
+ clazz = findClass(name);
if (clazz != null) {
if (log.isDebugEnabled())
- log.debug(" Loading class from parent");
+ log.debug(" Loading class from local repository");
if (resolve)
resolveClass(clazz);
return (clazz);
@@ -1402,9 +1383,30 @@
} catch (ClassNotFoundException e) {
// Ignore
}
+
+ // (3) Delegate to parent unconditionally
+ if (!delegateLoad) {
+ if (log.isDebugEnabled())
+ log.debug(" Delegating to parent classloader at end: " +
parent);
+ ClassLoader loader = parent;
+ if (loader == null)
+ loader = system;
+ try {
+ clazz = Class.forName(name, false, loader);
+ if (clazz != null) {
+ if (log.isDebugEnabled())
+ log.debug(" Loading class from parent");
+ if (resolve)
+ resolveClass(clazz);
+ return (clazz);
+ }
+ } catch (ClassNotFoundException e) {
+ // Ignore
+ }
+ }
+
+ throw new ClassNotFoundException(name);
}
-
- throw new ClassNotFoundException(name);
}
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