adding plugin version to track the reload count

Author: tulinkry

src/org/opensolaris/opengrok/authorization/AuthorizationFramework.java

@@ -71,6 +71,20 @@ public final class AuthorizationFramework {
      */
     List<AuthorizationPluginWrapper> plugins;
 
+    /**
+     * Keeping track of the number of reloads in this framework. This can be
+     * used by the plugins to invalidate the session and force reload the
+     * authorization values.
+     *
+     * Starting at 0 and increases with every reload.
+     *
+     * The plugin should call RuntimeEnvironment.getPluginVersion() to get this
+     * number.
+     *
+     * @see RuntimeEnvironment#getPluginVersion()
+     */
+    private int pluginVersion = 0;
+
     /**
      * Plugin directory is set through RuntimeEnvironment.
      *
@@ -483,6 +497,9 @@ public Object run() {
         // clean all plugins
         removeAll();
 
+        // increase the current plugin version tracked by the framework
+        increasePluginVersion();
+
         // add spaces with configured plugins - leaving null just to obtain the correct order of execution
         for (AuthorizationCheck check : RuntimeEnvironment.getInstance().getPluginConfiguration()) {
             plugins.add(new AuthorizationPluginWrapper(check, null));
@@ -496,6 +513,39 @@ public Object run() {
         loadAllPlugins();
     }
 
+    /**
+     * Returns the current plugins version in this framework. This can be used
+     * by the plugins to invalidate the session and force reload the
+     * authorization values.
+     *
+     * This number changes with every plugin reload.
+     *
+     * The plugin should call RuntimeEnvironment.getPluginVersion() to get this
+     * number and act upon if it needs to renew the session.
+     *
+     * @return the current version number
+     * @see RuntimeEnvironment#getPluginVersion()
+     */
+    public int getPluginVersion() {
+        return pluginVersion;
+    }
+
+    /**
+     * Changes the plugin version to the next version.
+     */
+    public void increasePluginVersion() {
+        this.pluginVersion++;
+    }
+
+    /**
+     * Sets the plugin version to an arbitrary number.
+     *
+     * @param pluginVersion the number
+     */
+    public void setPluginVersion(int pluginVersion) {
+        this.pluginVersion = pluginVersion;
+    }
+
     /**
      * Checks if the request should have an access to a resource.
      *

src/org/opensolaris/opengrok/configuration/RuntimeEnvironment.java

@@ -1534,6 +1534,16 @@ public void loadStatistics(InputStream in) throws IOException, ParseException {
         }
     }
 
+    /**
+     * Return the current plugin version tracked by the authorization framework.
+     *
+     * @return the version
+     * @see AuthorizationFramework#getPluginVersion()
+     */
+    public int getPluginVersion() {
+        return AuthorizationFramework.getInstance().getPluginVersion();
+    }
+
     private ServerSocket configServerSocket;
 
     /**