Wrapper:

- Refactor the setup of class loaders so that it is clearer what is
  going on
- For the Log4J tests, add the custom Appender implementation to
  whichever class loader Log4J is put in
- Set and reset the thread context class loader to more accurately
  simulate the environment of a servlet container.

build.xml:
- Implement the multi-classloader test scenarios for Log4J, equivalent
  to those for JDK 1.4.

We now have a robust testing environment to catch any possible regressions
when modifying the functionality (such as ripping out Log4jFactory, as
discussed on COMMONS-DEV).

I don't have time to do the corresponding test scenarios for Avalon LogKit,
but anyone who wants to do so is welcome to create them.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/logging/trunk@138965 13f79535-47bb-0310-9956-ffa450edef68

src/test/org/apache/commons/logging/Wrapper.java

@@ -1,7 +1,7 @@
 /*
- * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/test/org/apache/commons/logging/Wrapper.java,v 1.1 2003/03/30 02:30:36 craigmcc Exp $
- * $Revision: 1.1 $
- * $Date: 2003/03/30 02:30:36 $
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/test/org/apache/commons/logging/Wrapper.java,v 1.2 2003/04/02 00:50:49 craigmcc Exp $
+ * $Revision: 1.2 $
+ * $Date: 2003/04/02 00:50:49 $
  *
  * ====================================================================
  *
@@ -66,6 +66,8 @@ import java.io.File;
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.ArrayList;
+import java.util.List;
 
 
 /**
@@ -108,7 +110,7 @@ import java.net.URLClassLoader;
  * only the wrapper class itself.</p>
  *
  * @author Craig R. McClanahan
- * @version $Revision: 1.1 $ $Date: 2003/03/30 02:30:36 $
+ * @version $Revision: 1.2 $ $Date: 2003/04/02 00:50:49 $
  */
 
 public class Wrapper {
@@ -118,6 +120,11 @@ public class Wrapper {
 
         try {
 
+            // Create variables we will need
+            List parentList = new ArrayList();
+            List childList = new ArrayList();
+            URL urls[] = null;
+
             // Construct URLs for the various JAR files
             File target = new File(System.getProperty("wrapper.target"));
             URL commonsLogging =
@@ -128,62 +135,55 @@ public class Wrapper {
                 (new File(target, "commons-logging-tests.jar")).toURL();
             URL junit =
                 (new File(System.getProperty("wrapper.junit"))).toURL();
+            URL appender = null;
             URL log4j = null;
             if (System.getProperty("wrapper.log4j") != null) {
-                log4j = (new File(System.getProperty("wrapper.log4j"))).toURL();
+                log4j =
+                    (new File(System.getProperty("wrapper.log4j"))).toURL();
+                appender =
+                    (new File(target, "commons-logging-appender.jar")).toURL();
             }
 
-            // Configure the parent class loader
-            URL parentURLs[] = null;
+            // Construct class loader repository lists for supported scenarios
             if ("API".equals(System.getProperty("wrapper.hierarchy"))) {
-                parentURLs = new URL[1];
-                parentURLs[0] = commonsLoggingApi;
-            } else {
+                parentList.add(commonsLoggingApi);
+                childList.add(commonsLogging);
                 if (log4j != null) {
-                    parentURLs = new URL[2];
-                    parentURLs[0] = commonsLogging;
-                    parentURLs[1] = log4j;
-                } else {
-                    parentURLs = new URL[1];
-                    parentURLs[0] = commonsLogging;
+                    childList.add(log4j);
+                    childList.add(appender);
+                }
+            } else { // Assumes "FULL"
+                parentList.add(commonsLogging);
+                if (log4j != null) {
+                    parentList.add(log4j);
+                    childList.add(appender);
                 }
             }
+            childList.add(commonsLoggingTests);
+            childList.add(junit);
+
+            // Construt the parent and child class loaders
+            urls = (URL[]) parentList.toArray(new URL[parentList.size()]);
             ClassLoader parent =
-                new URLClassLoader(parentURLs,
+                new URLClassLoader(urls,
                                    ClassLoader.getSystemClassLoader());
-
-            // Configure the child class loader
-            URL childURLs[] = null;
-            if ("API".equals(System.getProperty("wrapper.hierarchy"))) {
-                if (log4j != null) {
-                    childURLs = new URL[4];
-                } else {
-                    childURLs = new URL[3];
-                }
-                childURLs[0] = commonsLogging;
-                childURLs[1] = commonsLoggingTests;
-                childURLs[2] = junit;
-                if (log4j != null) {
-                    childURLs[3] = log4j;
-                }
-            } else {
-                childURLs = new URL[2];
-                childURLs[0] = commonsLoggingTests;
-                childURLs[1] = junit;
-            }
-            ClassLoader child = new URLClassLoader(childURLs, parent);
+            urls = (URL[]) childList.toArray(new URL[childList.size()]);
+            ClassLoader child = new URLClassLoader(urls, parent);
 
             // Execute the test runner for this TestCase
+            ClassLoader old = Thread.currentThread().getContextClassLoader();
+            Thread.currentThread().setContextClassLoader(child);
             Class clazz = child.loadClass("junit.textui.TestRunner");
             String params[] = new String[1];
             params[0] = System.getProperty("wrapper.testcase");
             Method method = clazz.getMethod("main",
                                             new Class[] { params.getClass() });
             method.invoke(null, new Object[] { params });
+            Thread.currentThread().setContextClassLoader(old);
 
         } catch (Exception e) {
 
-            System.out.println("Exception Occurred:  " + e);
+            System.out.println("Wrapper Exception Occurred:  " + e);
             e.printStackTrace(System.out);
             System.exit(1);
 

src/test/org/apache/commons/logging/log4j/CustomConfigTestCase.java

@@ -1,7 +1,7 @@
 /*
- * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/test/org/apache/commons/logging/log4j/CustomConfigTestCase.java,v 1.1 2003/03/30 05:22:50 craigmcc Exp $
- * $Revision: 1.1 $
- * $Date: 2003/03/30 05:22:50 $
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/test/org/apache/commons/logging/log4j/CustomConfigTestCase.java,v 1.2 2003/04/02 00:50:49 craigmcc Exp $
+ * $Revision: 1.2 $
+ * $Date: 2003/04/02 00:50:49 $
  *
  * ====================================================================
  *
@@ -85,7 +85,7 @@ import org.apache.log4j.spi.LoggingEvent;
  * logger configured per the configuration properties.</p>
  *
  * @author Craig R. McClanahan
- * @version $Revision: 1.1 $ $Date: 2003/03/30 05:22:50 $
+ * @version $Revision: 1.2 $ $Date: 2003/04/02 00:50:49 $
  */
 
 public class CustomConfigTestCase extends DefaultConfigTestCase {
@@ -235,7 +235,7 @@ public class CustomConfigTestCase extends DefaultConfigTestCase {
     protected void checkLoggingEvents(boolean thrown) {
         Iterator events = appender.events();
         for (int i = 0; i < testMessages.length; i++) {
-            assertTrue(events.hasNext());
+            assertTrue("Logged event " + i + " exists",events.hasNext());
             LoggingEvent event = (LoggingEvent) events.next();
             assertEquals("LoggingEvent level",
                          testLevels[i], event.getLevel());