From 256335adde5fdd30091892f63e195b453618800b Mon Sep 17 00:00:00 2001
From: hns <hannesw@gmail.com>
Date: Sat, 13 Dec 2008 01:39:10 +0000
Subject: [PATCH] Make launcher Main class compatible with jsvc (apache commons
 daemon) and adapt Server lifecycle API.

---
 src/helma/main/CommandlineRunner.java |  1 +
 src/helma/main/HelmaShutdownHook.java |  1 +
 src/helma/main/Server.java            | 32 +++++++++-----
 src/helma/main/launcher/Main.java     | 62 +++++++++++++++++++++++----
 4 files changed, 78 insertions(+), 18 deletions(-)

diff --git a/src/helma/main/CommandlineRunner.java b/src/helma/main/CommandlineRunner.java
index 31bcce20..aeaaee1f 100644
--- a/src/helma/main/CommandlineRunner.java
+++ b/src/helma/main/CommandlineRunner.java
@@ -107,6 +107,7 @@ public class CommandlineRunner {
 
         // stop the application and server
         server.stop();
+        server.shutdown();
     }
 
     
diff --git a/src/helma/main/HelmaShutdownHook.java b/src/helma/main/HelmaShutdownHook.java
index 3c4d2731..f3eff903 100644
--- a/src/helma/main/HelmaShutdownHook.java
+++ b/src/helma/main/HelmaShutdownHook.java
@@ -34,6 +34,7 @@ public class HelmaShutdownHook extends Thread {
         Server server = Server.getServer();
         if (server != null) {
             server.stop();
+            server.shutdown();
         }
      }
 }
diff --git a/src/helma/main/Server.java b/src/helma/main/Server.java
index 0107f092..de77d59a 100644
--- a/src/helma/main/Server.java
+++ b/src/helma/main/Server.java
@@ -92,6 +92,8 @@ public class Server implements Runnable {
 
     /**
      * Constructs a new Server instance with an array of command line options.
+     * TODO make this a singleton
+     * @param config the configuration
      */
     public Server(ServerConfig config) {
         server = this;
@@ -113,9 +115,23 @@ public class Server implements Runnable {
 
 
     /**
-     *  static main entry point.
+     * Static main entry point.
+     * @param args the command line arguments
      */
     public static void main(String[] args) {
+        loadServer(args);
+        // parse properties files etc
+        server.init();
+        // start the server main thread
+        server.start();
+    }
+
+    /**
+     * Entry point used by launcher.jar to load a server instance
+     * @param args the command line arguments
+     * @return the server instance
+     */
+    public static Server loadServer(String[] args) {
         checkJavaVersion();
 
         ServerConfig config = null;
@@ -130,12 +146,7 @@ public class Server implements Runnable {
 
         // create new server instance
         server = new Server(config);
-
-        // parse properties files etc
-        server.init();
-
-        // start the server main thread
-        server.start();
+        return server;
     }
 
 
@@ -513,10 +524,11 @@ public class Server implements Runnable {
 
     public void stop() {
         mainThread = null;
-        
-        getLogger().info("Shutting down Helma");
-
         appManager.stopAll();
+    }
+
+    public void shutdown() {
+        getLogger().info("Shutting down Helma");
 
         if (jetty != null) {
             try {
diff --git a/src/helma/main/launcher/Main.java b/src/helma/main/launcher/Main.java
index 539358f3..9e1b0b22 100644
--- a/src/helma/main/launcher/Main.java
+++ b/src/helma/main/launcher/Main.java
@@ -44,6 +44,12 @@ public class Main {
                                             "tagsoup.jar"
                                         };
 
+    private Class serverClass;
+    private Object server;
+
+    private static final Class[] EMPTY_CLASS_ARRAY = new Class[0];
+    private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
+
     /**
      * Helma boot method. This retrieves the Helma home directory, creates the
      * classpath and invokes main() in helma.main.Server.
@@ -52,27 +58,67 @@ public class Main {
      *
      */
     public static void main(String[] args) {
+        Main main = new Main();
+        main.init(args);
+        main.start();
+    }
+
+    public void init(String[] args) {
         try {
             String installDir = getInstallDir(args);
-
             ClassLoader loader = createClassLoader(installDir);
-
             // get the main server class
-            Class clazz = loader.loadClass("helma.main.Server");
+            serverClass = loader.loadClass("helma.main.Server");
             Class[] cargs = new Class[]{args.getClass()};
-            Method main = clazz.getMethod("main", cargs);
+            Method loadServer = serverClass.getMethod("loadServer", cargs);
             Object[] nargs = new Object[]{args};
-
-            // and invoke the static main(String, String[]) method
-            main.invoke(null, nargs);
+            // and invoke the static loadServer(String[]) method
+            server = loadServer.invoke(null, nargs);
+            Method init = serverClass.getMethod("init", EMPTY_CLASS_ARRAY);
+            init.invoke(server, EMPTY_OBJECT_ARRAY);
         } catch (Exception x) {
             // unable to get Helma installation dir from launcher jar
-            System.err.println("Unable to get Helma installation directory: ");
+            System.err.println("Unable to load Helma: ");
             x.printStackTrace();
             System.exit(2);
         }
     }
 
+    public void start() {
+        try {
+            Method start = serverClass.getMethod("start", EMPTY_CLASS_ARRAY);
+            start.invoke(server, EMPTY_OBJECT_ARRAY);
+        } catch (Exception x) {
+            // unable to get Helma installation dir from launcher jar
+            System.err.println("Unable to start Helma: ");
+            x.printStackTrace();
+            System.exit(2);
+        }
+    }
+
+    public void stop() {
+        try {
+            Method start = serverClass.getMethod("stop", EMPTY_CLASS_ARRAY);
+            start.invoke(server, EMPTY_OBJECT_ARRAY);
+        } catch (Exception x) {
+            // unable to get Helma installation dir from launcher jar
+            System.err.println("Unable to stop Helma: ");
+            x.printStackTrace();
+            System.exit(2);
+        }
+    }
+
+    public void destroy() {
+        try {
+            Method start = serverClass.getMethod("shutdown", EMPTY_CLASS_ARRAY);
+            start.invoke(server, EMPTY_OBJECT_ARRAY);
+        } catch (Exception x) {
+            // unable to get Helma installation dir from launcher jar
+            System.err.println("Unable to shutdown Helma: ");
+            x.printStackTrace();
+            System.exit(2);
+        }
+    }
 
     /**
      * Create a server-wide ClassLoader from our install directory.