/*
* DiscoveryMangerPreferences.java
*
* Copyright (c) 2010, Ralf Biedert All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the author nor the names of its contributors may be used to endorse or
* promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.impl.localpreferences;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.UUID;
import java.util.logging.Logger;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;
import net.xeoh.plugins.base.Plugin;
import net.xeoh.plugins.base.PluginManager;
import net.xeoh.plugins.base.impl.PluginManagerFactory;
import net.xeoh.plugins.base.util.JSPFProperties;
import net.xeoh.plugins.remote.PublishMethod;
import net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.DiscoveryManager;
import net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.ExportInfo;
import net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.ExportedPlugin;
import net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.impl.AbstractDiscoveryManager;
import net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.impl.ExportEntry;
/**
* @author rb
*
*/
public class DiscoveryMangerPreferencesImpl extends AbstractDiscoveryManager implements
DiscoveryManager {
/** Root for all agents */
private Preferences agentsRoot;
/** All of our exports node */
private Preferences ourExportsNode;
/** Only valid results if this is true ...*/
boolean initSuccessful = false;
/** Our ID */
final String ourID;
/** A list of all exported entities we have */
final Collection<LocalExportEntry> allExported = new ArrayList<LocalExportEntry>();
/**
* Creates a new preferences manager
*/
public DiscoveryMangerPreferencesImpl() {
this.ourID = UUID.randomUUID().toString();
try {
this.agentsRoot = Preferences.systemNodeForPackage(getClass()).node("agents");
this.agentsRoot.sync();
init();
} catch (Exception e) {
e.printStackTrace();
this.logger.fine("Error initializing loopback discovery");
}
this.initSuccessful = true;
}
/** */
private void init() {
final Logger lgger = DiscoveryMangerPreferencesImpl.this.logger;
final Preferences root = DiscoveryMangerPreferencesImpl.this.agentsRoot;
final Preferences ournode = this.agentsRoot.node(this.ourID);
this.ourExportsNode = ournode.node("exports");
this.logger.fine("Using UID " + this.ourID);
// Runs regularly to clean up unused names
final Thread cleanup = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
// First, update the timestamp of OUR NODE ...
ournode.putLong("last.pass", System.currentTimeMillis());
// ... and eventually clear ALL NODES which have been up for too long
try {
final String[] childrenNames = root.childrenNames();
for (String string : childrenNames) {
final Preferences node = root.node(string);
long time = node.getLong("last.pass", 0);
if (time < System.currentTimeMillis() - 2000) {
lgger.fine("Removing old node " + node.name());
node.removeNode();
}
}
} catch (BackingStoreException e1) {
lgger.fine("Error getting children ...");
e1.printStackTrace();
}
// And sleep some moment before we try again
try {
root.sync();
Thread.sleep(250);
} catch (InterruptedException e) {
lgger.fine("Sleep Interrupted.");
} catch (BackingStoreException e) {
lgger.fine("Errow syncing node.");
e.printStackTrace();
}
}
}
});
cleanup.setDaemon(true);
cleanup.start();
}
/* (non-Javadoc)
* @see net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.impl.AbstractDiscoveryManager#anouncePlugin(net.xeoh.plugins.base.Plugin, net.xeoh.plugins.remote.PublishMethod, java.net.URI)
*/
@Override
public synchronized void anouncePlugin(Plugin plugin, PublishMethod method, URI url) {
final LocalExportEntry localExportEntry = new LocalExportEntry();
localExportEntry.plugin = plugin;
localExportEntry.method = method;
localExportEntry.uri = url;
localExportEntry.timeOfExport = System.currentTimeMillis();
localExportEntry.nodeID = UUID.randomUUID().toString();
final Preferences ournode = this.ourExportsNode.node(localExportEntry.nodeID);
ournode.put("export.uri", url.toString());
ournode.put("export.method", method.name());
ournode.putLong("export.time", localExportEntry.timeOfExport);
final Collection<Class<? extends Plugin>> allPluginClasses = getAllPluginClasses(plugin);
final StringBuilder sb = new StringBuilder();
for (Class<?> c : allPluginClasses) {
sb.append(c.getCanonicalName());
sb.append(";");
}
ournode.put("export.plugins", sb.toString());
// Store the new plugin
try {
this.agentsRoot.sync();
} catch (BackingStoreException e) {
e.printStackTrace();
}
this.allExported.add(localExportEntry);
}
/* (non-Javadoc)
* @see net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.impl.AbstractDiscoveryManager#revokePlugin(net.xeoh.plugins.base.Plugin, net.xeoh.plugins.remote.PublishMethod, java.net.URI)
*/
@Override
public synchronized void revokePlugin(Plugin plugin, PublishMethod publishMethod,
URI uri) {
final Collection<ExportEntry> toRemove = new ArrayList<ExportEntry>();
synchronized (this.allExported) {
for (LocalExportEntry e : this.allExported) {
if (e.plugin == plugin && e.method == publishMethod && e.uri.equals(uri)) {
toRemove.add(e);
final Preferences ournode = this.ourExportsNode.node(e.nodeID);
try {
ournode.removeNode();
this.agentsRoot.sync();
} catch (BackingStoreException e1) {
e1.printStackTrace();
}
}
}
}
this.allExported.removeAll(toRemove);
}
/* (non-Javadoc)
* @see net.xeoh.plugins.remotediscovery.impl.common.discoverymanager.DiscoveryManager#getExportInfoFor(java.lang.String)
*/
@Override
public synchronized ExportInfo getExportInfoFor(String pluginInteraceName) {
this.logger.fine("Was queried for plugin name " + pluginInteraceName);
final ExportInfo exportInfo = new ExportInfo();
exportInfo.isExported = false;
exportInfo.allExported = new ArrayList<ExportedPlugin>();
// We have to iterate over all agents ... and all their nodes
try {
// Sync!
this.agentsRoot.sync();
// Get all child nodes ...
final String[] allAgents = this.agentsRoot.childrenNames();
for (String entry : allAgents) {
this.logger.fine("Found agent " + entry);
final Preferences currentNode = this.agentsRoot.node(entry + "/exports");
final String[] allExports = currentNode.childrenNames();
for (String string : allExports) {
this.logger.finer("Found export node " + string);
final Preferences exportNode = currentNode.node(string);
final String[] interfaces = exportNode.get("export.plugins", "").split(";");
boolean found = false;
// Check if one of the interface names matches
for (String iface : interfaces) {
this.logger.finest("Exported plugin interface " + iface);
if (!iface.equals(pluginInteraceName)) continue;
found = true;
}
if (!found) continue;
// In here we have an exported plugin
final ExportedPlugin exportedPlugin = new ExportedPlugin();
exportedPlugin.exportMethod = exportNode.get("export.method", "");
exportedPlugin.exportURI = URI.create(exportNode.get("export.uri", ""));
exportedPlugin.timeSinceExport = Long.parseLong(exportNode.get("export.time", ""));
exportedPlugin.port = exportedPlugin.exportURI.getPort();
exportInfo.allExported.add(exportedPlugin);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return exportInfo;
}
/**
* Debugs the structure
*/
public void debug() {
try {
this.agentsRoot.sync();
} catch (BackingStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
debug(this.agentsRoot);
}
/**
* @param start
*/
private void debug(Preferences start) {
System.out.println(start.absolutePath());
try {
String[] keys = start.keys();
for (String string : keys) {
System.out.println(" " + string + " -> " + start.get(string, ""));
}
String[] childrenNames = start.childrenNames();
for (String string : childrenNames) {
debug(start.node(string));
}
} catch (BackingStoreException e) {
e.printStackTrace();
}
}
/**
* @param args
* @throws InterruptedException
* @throws URISyntaxException
*/
public static void main(String[] args) throws InterruptedException,
URISyntaxException {
final JSPFProperties props = new JSPFProperties();
props.setProperty(PluginManager.class, "cache.enabled", "true");
props.setProperty(PluginManager.class, "cache.file", "myjspf.cache");
final PluginManager pm = PluginManagerFactory.createPluginManager(props);
DiscoveryMangerPreferencesImpl dmp = new DiscoveryMangerPreferencesImpl();
dmp.anouncePlugin(pm, PublishMethod.JAVASCRIPT, new URI("http://xxx.com"));
dmp.debug();
ExportInfo exportInfoFor = dmp.getExportInfoFor("net.xeoh.plugins.base.Plugin");
Collection<ExportedPlugin> all = exportInfoFor.allExported;
for (ExportedPlugin e : all) {
System.out.println(e.exportURI);
}
Thread.sleep(1000);
}
}