Revision: 18025
http://sourceforge.net/p/gate/code/18025
Author: johann_p
Date: 2014-05-22 17:38:55 +0000 (Thu, 22 May 2014)
Log Message:
-----------
A tool that tries to unload all plugins which are not used anywhere,
i.e. which do not have any instances of resources loaded.
Added Paths:
-----------
gate/trunk/plugins/Developer_Tools/src/gate/creole/UnusedPluginUnloader.java
Added:
gate/trunk/plugins/Developer_Tools/src/gate/creole/UnusedPluginUnloader.java
===================================================================
---
gate/trunk/plugins/Developer_Tools/src/gate/creole/UnusedPluginUnloader.java
(rev 0)
+++
gate/trunk/plugins/Developer_Tools/src/gate/creole/UnusedPluginUnloader.java
2014-05-22 17:38:55 UTC (rev 18025)
@@ -0,0 +1,142 @@
+/*
+ * UnusedPluginUnloader.java
+ *
+ * Copyright (c) 1995-2014, The University of Sheffield. See the file
+ * COPYRIGHT.txt in the software or at http://gate.ac.uk/gate/COPYRIGHT.txt
+ *
+ * This file is part of GATE (see http://gate.ac.uk/), and is free software,
+ * licenced under the GNU Library General Public License, Version 2, June 1991
+ * (in the distribution as file licence.html, and also available at
+ * http://gate.ac.uk/gate/licence.html).
+ *
+ * Johann Petrak 2014-05-22
+ */
+package gate.creole;
+
+import gate.CreoleRegister;
+import gate.Gate;
+import gate.Resource;
+import gate.creole.metadata.AutoInstance;
+import gate.creole.metadata.CreoleResource;
+import gate.gui.ActionsPublisher;
+import gate.resources.img.svg.Log4JALLIcon;
+import gate.util.GateException;
+import gate.util.GateRuntimeException;
+import java.awt.event.ActionEvent;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import javax.swing.AbstractAction;
+import javax.swing.Action;
+import org.apache.log4j.Appender;
+import org.apache.log4j.AppenderSkeleton;
+import org.apache.log4j.Level;
+import org.apache.log4j.Logger;
+
+/**
+ * A tool option that will try its best to unload just the plugins for which
+ * we do not have any known instances.
+ *
+ *
+ * @author Johann Petrak
+ */
+@SuppressWarnings("serial")
+@CreoleResource(
+ tool = true,
+ isPrivate = true,
+ autoinstances = @AutoInstance,
+ name = "Unload unused plugins",
+ helpURL = "http://gate.ac.uk/userguide/sec:misc-creole:dev-tools";,
+ comment = "Unloads all plugins for which we cannot find any loaded
instances")
+public class UnusedPluginUnloader extends AbstractResource implements
ActionsPublisher {
+ // the cached set of actions so we don't have to keep creating them
+ private List<Action> actions;
+
+ @Override
+ public List<Action> getActions() {
+
+ // if we have already built the action list then just return it
+ if(actions != null) return actions;
+
+ // create the empty actions list
+ actions = new ArrayList<Action>();
+
+ actions.add(new AbstractAction("Unload unused plugins") {
+
+ @Override
+ public void actionPerformed(ActionEvent e) {
+
+ CreoleRegister reg = Gate.getCreoleRegister();
+ List<Resource> allInstances;
+ try {
+ allInstances = reg.getAllInstances("gate.Resource");
+ } catch (GateException ex) {
+ System.err.println("Could not obtain the resource instances!");
+ ex.printStackTrace(System.err);
+ return;
+ }
+ Set<URL> allPlugins = new HashSet<URL>();
+ for (ResourceData rd : reg.values()) {
+ String uriString = rd.getXmlFileUrl().toString();
+ if (uriString.startsWith("file:")) {
+ uriString = uriString.replaceAll("creole.xml$", "");
+ try {
+ allPlugins.add(new URL(uriString));
+ } catch (MalformedURLException ex) {
+ // ignore this, in the worst case we won't unload this plugin ...
+ }
+ }
+ }
+ Set<URL> usedPlugins = new HashSet<URL>();
+ for (Resource res : allInstances) {
+ String clazz = res.getClass().getName();
+ ResourceData rd = reg.get(clazz);
+ if (rd == null) {
+ // ignore ...
+ //System.out.println("ODD: no resource data found for class " +
clazz);
+ } else {
+ String uriString = rd.getXmlFileUrl().toString();
+ if (uriString.startsWith("file:")) {
+ uriString = uriString.replaceAll("creole.xml$", "");
+ try {
+ usedPlugins.add(new URL(uriString));
+ } catch (MalformedURLException ex) {
+ // ignore: we may unload a plugin that is used, but this
should never happen ...
+ }
+ }
+ }
+ }
+ List<URL> pluginsToUnload = new ArrayList<URL>();
+ for (URL plugin : allPlugins) {
+ if (!usedPlugins.contains(plugin)) {
+ pluginsToUnload.add(plugin);
+ }
+ }
+ int n = 0;
+ for (URL plugin : pluginsToUnload) {
+ // The system logs plugins getting unloaded, so we do not have to do
it
+ // System.out.println("Unloading plugin: " + plugin);
+ reg.removeDirectory(plugin);
+ n++;
+ }
+ if(n==0) {
+ System.out.println("No plugin unloaded");
+ } else {
+ System.out.println("Plugins unloaded: "+n);
+ }
+ System.out.println("\nPlugins still loaded:");
+ for(URL plugin : usedPlugins) {
+ System.out.println(" "+plugin);
+ }
+ }
+ });
+
+ //return the list of actions
+ return actions;
+ }
+
+}
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