remm 02/02/18 18:45:23
Added: daemon/src/java/org/apache/commons/daemon/support
DaemonLoader.java
Log:
- Add the loader helper from the Tomcat repository.
Revision Changes Path
1.1
jakarta-commons-sandbox/daemon/src/java/org/apache/commons/daemon/support/DaemonLoader.java
Index: DaemonLoader.java
===================================================================
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/* @version $Id: DaemonLoader.java,v 1.1 2002/02/19 02:45:23 remm Exp $ */
package org.apache.commons.daemon.support;
import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.apache.commons.daemon.DaemonController;
public final class DaemonLoader {
private static Controller controller = null;
private static Context context = null;
private static Daemon daemon = null;
public static void version() {
System.err.println("java version \""+
System.getProperty("java.version")+
"\"");
System.err.println(System.getProperty("java.runtime.name")+
" (build "+
System.getProperty("java.runtime.version")+
")");
System.err.println(System.getProperty("java.vm.name")+
" (build "+
System.getProperty("java.vm.version")+
", "+
System.getProperty("java.vm.info")+
")");
}
public static boolean check(String cn) {
try {
/* Check the class name */
if (cn==null)
throw new NullPointerException("Null class name specified");
/* Get the ClassLoader loading this class */
ClassLoader cl=DaemonLoader.class.getClassLoader();
if (cl==null) {
System.err.println("Cannot retrieve ClassLoader instance");
return(false);
}
/* Find the required class */
Class c=cl.loadClass(cn);
/* This should _never_ happen, but doublechecking doesn't harm */
if (c==null) throw new ClassNotFoundException(cn);
/* Create a new instance of the daemon */
Daemon s=(Daemon)c.newInstance();
} catch (Throwable t) {
/* In case we encounter ANY error, we dump the stack trace and
return false (load, start and stop won't be called). */
t.printStackTrace(System.err);
return(false);
}
/* The class was loaded and instantiated correctly, we can return */
return(true);
}
public static boolean load(String cn, String ar[]) {
try {
/* Make sure any previous instance is garbage collected */
System.gc();
/* Check if the underlying libray supplied a valid list of
arguments */
if (ar==null) ar=new String[0];
/* Check the class name */
if (cn==null)
throw new NullPointerException("Null class name specified");
/* Get the ClassLoader loading this class */
ClassLoader cl=DaemonLoader.class.getClassLoader();
if (cl==null) {
System.err.println("Cannot retrieve ClassLoader instance");
return(false);
}
/* Find the required class */
Class c=cl.loadClass(cn);
/* This should _never_ happen, but doublechecking doesn't harm */
if (c==null) throw new ClassNotFoundException(cn);
/* Create a new instance of the daemon */
daemon=(Daemon)c.newInstance();
/* Create a new controller instance */
controller=new Controller();
/* Set the availability flag in the controller */
controller.setAvailable(false);
/* Create context */
context = new Context();
context.setArguments(ar);
context.setController(controller);
/* Now we want to call the init method in the class */
daemon.init(context);
} catch (Throwable t) {
/* In case we encounter ANY error, we dump the stack trace and
return false (load, start and stop won't be called). */
t.printStackTrace(System.err);
return(false);
}
/* The class was loaded and instantiated correctly, we can return */
return(true);
}
public static boolean start() {
try {
/* Attempt to start the daemon */
daemon.start();
/* Set the availability flag in the controller */
controller.setAvailable(true);
} catch (Throwable t) {
/* In case we encounter ANY error, we dump the stack trace and
return false (load, start and stop won't be called). */
t.printStackTrace(System.err);
return(false);
}
return(true);
}
public static boolean stop() {
try {
/* Set the availability flag in the controller */
controller.setAvailable(false);
/* Attempt to start the daemon */
daemon.stop();
/* Run garbage collector */
daemon=null;
controller=null;
System.gc();
} catch (Throwable t) {
/* In case we encounter ANY error, we dump the stack trace and
return false (load, start and stop won't be called). */
t.printStackTrace(System.err);
return(false);
}
return(true);
}
private static native void shutdown(boolean reload);
public static class Controller implements DaemonController {
boolean available=false;
private Controller() {
super();
this.setAvailable(false);
}
private boolean isAvailable() {
synchronized (this) {
return(this.available);
}
}
private void setAvailable(boolean available) {
synchronized (this) {
this.available=available;
}
}
public void shutdown() throws IllegalStateException {
synchronized (this) {
if (!this.isAvailable()) {
throw new IllegalStateException();
} else {
this.setAvailable(false);
DaemonLoader.shutdown(false);
}
}
}
public void reload() throws IllegalStateException {
synchronized (this) {
if (!this.isAvailable()) {
throw new IllegalStateException();
} else {
this.setAvailable(false);
DaemonLoader.shutdown(true);
}
}
}
public void fail()
throws IllegalStateException {
}
public void fail(String message)
throws IllegalStateException {
}
public void fail(Exception exception)
throws IllegalStateException {
}
public void fail(String message, Exception exception)
throws IllegalStateException {
}
}
public static class Context implements DaemonContext {
DaemonController controller = null;
String[] args = null;
public DaemonController getController() {
return controller;
}
public void setController(DaemonController controller) {
this.controller = controller;
}
public String[] getArguments() {
return args;
}
public void setArguments(String[] args) {
this.args = args;
}
}
}
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