add logging handler

git-svn-id: http://trooper/svn/projects/jSite/trunk@751 c3eda9e8-030b-0410-8277-bc7414b0a119

diff --git a/src/net/pterodactylus/util/logging/Logging.java b/src/net/pterodactylus/util/logging/Logging.java
new file mode 100644 (file)
index 0000000..443c05d
--- /dev/null
+++ b/src/net/pterodactylus/util/logging/Logging.java
@@ -0,0 +1,154 @@
+/*
+ * jFCPlib-high-level-client - Logging.java -
+ * Copyright © 2008 David Roden
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package net.pterodactylus.util.logging;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+import java.util.logging.Logger;
+
+/**
+ * Sets up logging.
+ * 
+ * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+ * @version $Id$
+ */
+public class Logging {
+
+       /** The log handler. */
+       private static final LogHandler logHandler = new LogHandler();
+
+       /**
+        * Adds a listener to the log handler.
+        * 
+        * @param loggingListener
+        *            The listener to add
+        */
+       public static void addLoggingListener(LoggingListener loggingListener) {
+               logHandler.addLoggingListener(loggingListener);
+       }
+
+       /**
+        * Removes a listener from the log handler.
+        * 
+        * @param loggingListener
+        *            The listener to remove
+        */
+       public static void removeLoggingListener(LoggingListener loggingListener) {
+               logHandler.removeLoggingListener(loggingListener);
+       }
+
+       /**
+        * Sets up logging and installs the log handler.
+        */
+       public static void setup() {
+               Logger rootLogger = Logger.getAnonymousLogger().getParent();
+               rootLogger.addHandler(logHandler);
+               rootLogger.setLevel(Level.ALL);
+               logHandler.setLevel(Level.INFO);
+       }
+
+       /**
+        * The log handler simply forwards every log message it receives to all
+        * registered listeners.
+        * 
+        * @see LoggingListener
+        * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+        * @version $Id$
+        */
+       private static class LogHandler extends Handler {
+
+               /**
+                * Package-private constructor.
+                */
+               LogHandler() {
+               }
+
+               /** The list of the listeners. */
+               private final List<LoggingListener> loggingListeners = Collections.synchronizedList(new ArrayList<LoggingListener>());
+
+               //
+               // EVENT MANAGEMENT
+               //
+
+               /**
+                * Adds a listener to the log handler.
+                * 
+                * @param loggingListener
+                *            The listener to add
+                */
+               public void addLoggingListener(LoggingListener loggingListener) {
+                       loggingListeners.add(loggingListener);
+               }
+
+               /**
+                * Removes a listener from the log handler.
+                * 
+                * @param loggingListener
+                *            The listener to remove
+                */
+               public void removeLoggingListener(LoggingListener loggingListener) {
+                       loggingListeners.remove(loggingListener);
+               }
+
+               /**
+                * Notifies all listeners that a log record was received.
+                * 
+                * @param logRecord
+                *            The received log record
+                */
+               private void fireLogged(LogRecord logRecord) {
+                       for (LoggingListener loggingListener: loggingListeners) {
+                               loggingListener.logged(logRecord);
+                       }
+               }
+
+               //
+               // INTERFACE Handler
+               //
+
+               /**
+                * {@inheritDoc}
+                */
+               @Override
+               public void close() throws SecurityException {
+               }
+
+               /**
+                * {@inheritDoc}
+                */
+               @Override
+               public void flush() {
+               }
+
+               /**
+                * {@inheritDoc}
+                */
+               @Override
+               public void publish(LogRecord logRecord) {
+                       fireLogged(logRecord);
+               }
+
+       }
+
+}

diff --git a/src/net/pterodactylus/util/logging/LoggingListener.java b/src/net/pterodactylus/util/logging/LoggingListener.java
new file mode 100644 (file)
index 0000000..788d848
--- /dev/null
+++ b/src/net/pterodactylus/util/logging/LoggingListener.java
@@ -0,0 +1,41 @@
+/*
+ * jFCPlib-high-level-client - LoggingListener.java -
+ * Copyright © 2008 David Roden
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package net.pterodactylus.util.logging;
+
+import java.util.EventListener;
+import java.util.logging.LogRecord;
+
+/**
+ * Interface for components that want to received logged messages.
+ * 
+ * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+ * @version $Id$
+ */
+public interface LoggingListener extends EventListener {
+
+       /**
+        * Notifies a listener that a new log record was received.
+        * 
+        * @param logRecord
+        *            The received log record
+        */
+       public void logged(LogRecord logRecord);
+
+}