[PATCH] Load config file from filesystem

[Byron Foster]

Here is patch that will load a config file from the file system.  It 
follows the same pattern as Torque and Velocity for initialization:

try
{
    JCS.init(filename);
}
catch(IOException e)
{
    // Do something.
}
Byron

Index: src/java/org/apache/jcs/JCS.java
===================================================================
RCS file: /home/cvspublic/jakarta-turbine-jcs/src/java/org/apache/jcs/JCS.java,v
retrieving revision 1.7
diff -u -r1.7 JCS.java
--- src/java/org/apache/jcs/JCS.java    22 Aug 2003 11:57:17 -0000      1.7
+++ src/java/org/apache/jcs/JCS.java    5 Sep 2003 01:48:26 -0000
@@ -54,6 +54,9 @@
  * <http://www.apache.org/>.
  */
 
+import java.io.File;
+import java.io.IOException;
+
 import org.apache.jcs.access.GroupCacheAccess;
 import org.apache.jcs.access.exception.CacheException;
 import org.apache.jcs.engine.behavior.ICompositeCacheAttributes;
@@ -74,8 +77,12 @@
  */
 public class JCS extends GroupCacheAccess
 {
+    // Resource path of config file    
     private static String configFilename = null;
 
+    // File system path of config file
+    private static File configFilePath = null;
+  
     private static CompositeCacheManager cacheMgr;
 
     /**
@@ -130,25 +137,46 @@
     {
         if ( cacheMgr == null )
         {
-            if ( configFilename == null )
+            if (configFilename != null)
             {
-                cacheMgr = CompositeCacheManager.getInstance();
+                cacheMgr = CompositeCacheManager.getUnconfiguredInstance();
+                cacheMgr.configure( configFilename );
             }
-            else
+            else if (configFilePath != null)
             {
                 cacheMgr = CompositeCacheManager.getUnconfiguredInstance();
-
-                cacheMgr.configure( configFilename );
+                cacheMgr.configure(configFilePath); 
+            }
+            else 
+            {
+                cacheMgr = CompositeCacheManager.getInstance();
             }
         }
     }
 
     /**
-     * Set the filename that the cache manager will be initialized with. Only
-     * matters before the instance is initialized.
+     * Set the filename resource path that the cache manager will be
+     * initialized with. Only matters before the instance is
+     * initialized.
      */
     public static void setConfigFilename( String configFilename )
     {
         JCS.configFilename = configFilename;
     }
+
+    /**
+     * Sets the file path within the file system to a configuration
+     * file to load cache properties from.
+     */
+    public static void init(String filename)
+        throws IOException
+    {
+        File file = new File(filename);
+        if (!file.canRead())
+        {
+            throw new IOException("File '" + filename + "' cannot be read");
+        }
+        JCS.configFilePath = file;
+    }
+    
 }
Index: src/java/org/apache/jcs/engine/control/CompositeCacheManager.java
===================================================================
RCS file: 
/home/cvspublic/jakarta-turbine-jcs/src/java/org/apache/jcs/engine/control/CompositeCacheManager.java,v
retrieving revision 1.7
diff -u -r1.7 CompositeCacheManager.java
--- src/java/org/apache/jcs/engine/control/CompositeCacheManager.java   22 Aug 2003 
11:57:18 -0000      1.7
+++ src/java/org/apache/jcs/engine/control/CompositeCacheManager.java   5 Sep 2003 
01:48:27 -0000
@@ -56,6 +56,8 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.FileInputStream;
+import java.io.File;
 import java.io.Serializable;
 import java.util.Enumeration;
 import java.util.Hashtable;
@@ -227,6 +229,35 @@
         configure( props );
     }
 
+    /**
+     * Load config properties from the file system, and not from the
+     * classpath.
+     * @param configFile Path to file on file system.
+     */
+    public void configure(File configFile)
+    {
+        Properties props = new Properties();
+        InputStream is = null;
+        try
+        {
+            is = new FileInputStream(configFile);
+            props.load(is);
+            is.close();
+        }
+        catch ( IOException ex )
+        {
+            // We have already checked to make sure that the configFile
+            // exists and is readable, so if something goes wrong here
+            // it is a big problem.  However to be consistent with
+            // configure(String) we ignore it.
+            log.error( "Failed to load properties", ex );
+            throw new IllegalStateException( ex.getMessage() );
+        }
+        
+        configure( props );
+    }
+    
+  
     /**
      * Configure from properties object
      *
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