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Read event listeners from properties.

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This commit is contained in:
Michael Jumper
2012-03-23 17:34:24 -07:00
parent f903b22fe9
commit 55639817b4
3 changed files with 94 additions and 11 deletions
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17
guacamole/src/main/java/net/sourceforge/guacamole/net/basic/event/SessionListenerCollection.java
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@@ -8,6 +8,8 @@ import java.util.Iterator;
import javax.servlet.http.HttpSession;
import net.sourceforge.guacamole.GuacamoleException;
import net.sourceforge.guacamole.net.basic.GuacamoleClassLoader;
import net.sourceforge.guacamole.net.basic.properties.BasicGuacamoleProperties;
import net.sourceforge.guacamole.properties.GuacamoleProperties;
/**
* A collection which iterates over instances of all listeners defined in
@@ -55,10 +57,13 @@ public class SessionListenerCollection extends AbstractCollection {
listeners = new ArrayList();
try {
// TODO: Retrieve list of listener classnames from properties
Class listenerClass = GuacamoleClassLoader.getInstance().loadClass(
"net.sourceforge.guacamole.test.GenericLoggingListener"
);
// Get all listener classes from properties
Collection<Class> listenerClasses =
GuacamoleProperties.getProperty(BasicGuacamoleProperties.EVENT_LISTENERS);
// Add an instance of each class to the list
if (listenerClasses != null) {
for (Class listenerClass : listenerClasses) {
// Instantiate listener
Object listener = listenerClass.getConstructor().newInstance();
@@ -67,8 +72,8 @@ public class SessionListenerCollection extends AbstractCollection {
listeners.add(listener);
}
catch (ClassNotFoundException e) {
throw new GuacamoleException("Could not find listener class.", e);
}
}
catch (InstantiationException e) {
throw new GuacamoleException("Listener class is abstract.", e);

10
guacamole/src/main/java/net/sourceforge/guacamole/net/basic/properties/BasicGuacamoleProperties.java
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@@ -54,4 +54,14 @@ public class BasicGuacamoleProperties {
};
/**
* The comma-separated list of all classes to use as event listeners.
*/
public static final EventListenersProperty EVENT_LISTENERS = new EventListenersProperty() {
@Override
public String getName() { return "event-listeners"; }
};
}

68
guacamole/src/main/java/net/sourceforge/guacamole/net/basic/properties/EventListenersProperty.java Normal file
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@@ -0,0 +1,68 @@
package net.sourceforge.guacamole.net.basic.properties;
/*
* Guacamole - Clientless Remote Desktop
* Copyright (C) 2010 Michael Jumper
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.ArrayList;
import java.util.Collection;
import net.sourceforge.guacamole.GuacamoleException;
import net.sourceforge.guacamole.net.basic.GuacamoleClassLoader;
import net.sourceforge.guacamole.properties.GuacamoleProperty;
/**
* A GuacamoleProperty whose value is a comma-separated list of class names,
* where each class will be used as a listener for events.
*
* @author Michael Jumper
*/
public abstract class EventListenersProperty implements GuacamoleProperty<Collection<Class>> {
@Override
public Collection<Class> parseValue(String classNameList) throws GuacamoleException {
// If no property provided, return null.
if (classNameList == null)
return null;
// Parse list
String[] classNames = classNameList.split(",[\\s]*");
// Fill list of classes
Collection<Class> listeners = new ArrayList<Class>();
try {
// Load all classes in list
for (String className : classNames) {
Class clazz = GuacamoleClassLoader.getInstance().loadClass(className);
listeners.add(clazz);
}
}
catch (ClassNotFoundException e) {
throw new GuacamoleException("Listener class not found.", e);
}
catch (SecurityException e) {
throw new GuacamoleException("Security settings prevent loading of listener class.", e);
}
return listeners;
}
}