improve plugin management

scm-web-api/src/main/java/sonia/scm/web/plugin/SCMPluginManager.java

@@ -0,0 +1,128 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+
+
+package sonia.scm.web.plugin;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.io.IOException;
+
+import java.net.URL;
+
+import java.util.Enumeration;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import javax.xml.bind.JAXB;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class SCMPluginManager
+{
+
+  /** Field description */
+  public static final String PATH_PLUGINCONFIG = "META-INF/scm/plugin.xml";
+
+  /** Field description */
+  private static final Logger logger =
+    LoggerFactory.getLogger(SCMPluginManager.class);
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @throws IOException
+   */
+  public void load() throws IOException
+  {
+    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+
+    if (classLoader == null)
+    {
+      classLoader = SCMPluginManager.class.getClassLoader();
+    }
+
+    load(classLoader);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param classLoader
+   *
+   * @throws IOException
+   */
+  public void load(ClassLoader classLoader) throws IOException
+  {
+    Enumeration<URL> urlEnum = classLoader.getResources(PATH_PLUGINCONFIG);
+
+    if (urlEnum != null)
+    {
+      while (urlEnum.hasMoreElements())
+      {
+        URL url = urlEnum.nextElement();
+
+        loadPlugin(url);
+      }
+    }
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @return
+   */
+  public Set<SCMPlugin> getPlugins()
+  {
+    return plugins;
+  }
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param url
+   */
+  private void loadPlugin(URL url)
+  {
+    try
+    {
+      SCMPlugin plugin = JAXB.unmarshal(url, SCMPlugin.class);
+
+      if (logger.isInfoEnabled())
+      {
+        logger.info("load plugin {}", url.toExternalForm());
+      }
+
+      plugins.add(plugin);
+    }
+    catch (Exception ex)
+    {
+      logger.error(ex.getMessage(), ex);
+    }
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private Set<SCMPlugin> plugins = new LinkedHashSet<SCMPlugin>();
+}