initial check in of new helma.main package

src/helma/main/ApplicationManager.java

@@ -0,0 +1,145 @@
+// ApplicationManager.java
+// Copyright (c) Hannes Wallnöfer 1998-2000
+ 
+package helma.main;
+
+import java.util.Hashtable;
+import java.util.Enumeration;
+import java.io.*;
+import java.lang.reflect.*;
+import java.rmi.*;
+import java.rmi.server.*;
+import helma.framework.*;
+import helma.framework.core.*;
+import helma.objectmodel.*;
+import helma.servlet.*;
+import helma.util.SystemProperties;
+import Acme.Serve.*;
+import javax.servlet.Servlet;
+
+
+/**
+ * This class is responsible for starting and stopping Helma applications.
+ */
+ 
+public class ApplicationManager {
+
+    private Hashtable applications;
+    private int port;
+    private File hopHome;
+    private SystemProperties props;
+    private Server server;
+    private long lastModified;
+
+    public ApplicationManager (int port, File hopHome, SystemProperties props, Server server) {
+	this.port = port;
+	this.hopHome = hopHome;
+	this.props = props;
+	this.server = server;
+	applications = new Hashtable ();
+	lastModified = 0;
+    }
+
+
+    // regularely check applications property file to create and start new applications
+    protected void checkForChanges () {
+	if (props.lastModified () > lastModified) {
+	    try {
+	        for (Enumeration e = props.keys(); e.hasMoreElements (); ) {
+	            String appName = (String) e.nextElement ();
+	            if (applications.get (appName) == null) {
+	                start (appName);
+	                register (appName);
+	            }
+	        }
+	        // then stop deleted ones
+	        for (Enumeration e = applications.keys(); e.hasMoreElements (); ) {
+	            String appName = (String) e.nextElement ();
+	            if (!props.containsKey (appName)) {
+	                stop (appName);
+	            }
+	        }
+	    } catch (Exception mx) {
+	        Server.getLogger().log ("Error starting applications: "+mx);
+	    }
+
+	    lastModified = System.currentTimeMillis ();
+	}
+    }
+
+    private void start (String appName) {
+	Server.getLogger().log ("Building application "+appName);
+	try {
+	    Application app = new Application (appName, Server.sysProps, Server.dbProps, hopHome);
+	    applications.put (appName, app);
+	    // if we're running with the embedded web server, set app base uri to /appname
+	    if (server.websrv != null)
+	        app.setBaseURI ("/"+java.net.URLEncoder.encode (appName));
+	    // the application is initialized later in the register method, when it's bound
+	    app.start ();
+	} catch (Exception x) {
+	    Server.getLogger().log ("Error creating application "+appName+": "+x);
+	    x.printStackTrace ();
+	}
+    }
+
+    private void stop (String appName) {
+	Server.getLogger().log ("Stopping application "+appName);
+	try {
+	    Application app = (Application) applications.get (appName);
+	    if (server.websrv == null) {
+	        Naming.unbind ("//:"+port+"/"+appName);
+	    } else {
+	        server.websrv.removeServlet ("/"+appName+"/");
+	        server.websrv.removeServlet ("/"+appName+"/*");
+	    }
+	    app.stop ();
+	    Server.getLogger().log ("Unregistered application "+appName);
+	} catch (Exception x) {
+	    Server.getLogger().log ("Couldn't unregister app: "+x);
+	}
+	applications.remove (appName);
+    }
+
+    private void register (String appName) {
+	try {
+	    Server.getLogger().log ("Binding application "+appName);
+	    Application app = (Application) applications.get (appName);
+	    // app.start ();
+	    if (server.websrv == null) {
+	        Naming.rebind ("//:"+port+"/"+appName, app);
+	    } else {
+	        AcmeServletClient servlet = new AcmeServletClient (app);
+	        server.websrv.addServlet ("/"+appName+"/", servlet);
+	        server.websrv.addServlet ("/"+appName+"/*", servlet);
+	    }
+	} catch (Exception x) {
+	    Server.getLogger().log ("Couldn't register and start app: "+x);
+	}
+    }
+
+    public void startAll () {
+	try {
+	    for (Enumeration e = props.keys(); e.hasMoreElements (); ) {
+	        String appName = (String) e.nextElement ();
+	        start (appName);
+	    }
+	    for (Enumeration e = props.keys(); e.hasMoreElements (); ) {
+	        String appName = (String) e.nextElement ();
+	        register (appName);
+	    }
+	    if (server.websrv != null) {
+	        File staticContent = new File (server.getHopHome(), "static");
+	        Server.getLogger().log("Serving static content from "+staticContent.getAbsolutePath());
+	        AcmeFileServlet fsrv = new AcmeFileServlet (staticContent);
+	        server.websrv.addServlet ("/static/", fsrv);
+	        server.websrv.addServlet ("/static/*", fsrv);
+	    }
+	    lastModified = System.currentTimeMillis ();
+	} catch (Exception mx) {
+	    Server.getLogger().log ("Error starting applications: "+mx);
+	    mx.printStackTrace ();
+	}
+    }
+
+}