Add plugins/extension infrastructure

Plugins are stored in `${baseFolder}/plugins` and are loaded
during startup by the PluginManager.

A plugin defines it's metadata in META-INF/MANIFEST.MF:

    Plugin-Class: com.gitblit.plugins.cookbook.CookbookPlugin
    Plugin-Dependencies: foo, bar
    Plugin-Id: gitblit-plugin
    Plugin-Provider: John Doe
    Plugin-Version: 1.0

Plugins can define extension points that can be implemented
by other plugins and they can depend on other plugins:

    Plugin-Dependencies: foo, bar

During the load phase, a directed acyclic graph is built and the loading
order of the dependency chain is reversed using a topological sort;
parent followed by children. The parent plugin classloader is the
combined classloader of all parent plugins.

Change-Id: I738821fa2bff02a5dbe339a944cc7e3c4dd8e299

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main/java/com/gitblit/servlet/GitblitContext.java b/src/main/java/com/gitblit/servlet/GitblitContext.java
index cf8bba01..a98fe192 100644
--- a/src/main/java/com/gitblit/servlet/GitblitContext.java
+++ b/src/main/java/com/gitblit/servlet/GitblitContext.java
@@ -41,6 +41,7 @@ import com.gitblit.dagger.DaggerContext;
 import com.gitblit.manager.IAuthenticationManager;
 import com.gitblit.manager.IFederationManager;
 import com.gitblit.manager.IGitblit;
+import com.gitblit.manager.IPluginManager;
 import com.gitblit.manager.IManager;
 import com.gitblit.manager.INotificationManager;
 import com.gitblit.manager.IProjectManager;
@@ -184,6 +185,7 @@ public class GitblitContext extends DaggerContext {
 		startManager(injector, IProjectManager.class);
 		startManager(injector, IFederationManager.class);
 		startManager(injector, IGitblit.class);
+		startManager(injector, IPluginManager.class);
 
 		logger.info("");
 		logger.info("All managers started.");