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/*******************************************************************************
* Copyright (c) 2009, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal.base.remote;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.Hashtable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.help.internal.base.HelpBasePlugin;
import org.eclipse.help.internal.base.IHelpBaseConstants;
import org.eclipse.help.internal.base.util.TestConnectionUtility;
public class RemoteStatusData {
private static int TIMEOUT = 60 * 1000;
/*
* Convenience method to see if any remote help
* is down
*/
public static boolean isAnyRemoteHelpUnavailable()
{
ArrayList<URL> sites = getRemoteSites();
if (sites.isEmpty())
return false;
for (int s=0;s<sites.size();s++)
if (!isConnected(sites.get(s)))
return true;
return false;
}
/*
* Checks each URL in the ArrayList site to see if
* a network connection can be opened to
* url+/index.jsp
*
* Returns a subset of sites that cannot be connected.
* May be empty, or may be the same as sites
*/
public static ArrayList<URL> checkSitesConnectivity(ArrayList<URL> sites)
{
ArrayList<URL> badSites = new ArrayList<URL>();
for (int i=0;i<sites.size();i++)
if (!isConnected(sites.get(i)))
badSites.add(sites.get(i));
return badSites;
}
public static boolean isConnected(URL site)
{
ConnectionCache cache = ConnectionCache.getCache();
try{
return cache.isConnected(site);
}catch(CoreException e)
{
boolean connected = TestConnectionUtility.testConnection(site.getHost(),
"" + site.getPort(), site.getPath(), site.getProtocol()); //$NON-NLS-1$
cache.put(site, connected);
cache.resetTimer();
return connected;
}
}
/*
* Loads the remote sites stored in preferences,
* and places them as URLs in an ArrayList.
*
* Returns the ArrayList with sites in URL form
*/
public static ArrayList<URL> getRemoteSites()
{
ArrayList<URL> sites = new ArrayList<URL>();
boolean remoteHelpEnabled =
Platform.getPreferencesService().getBoolean(
HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_ON, false,null);
if (!remoteHelpEnabled)
return sites;
String hosts[] = Platform.getPreferencesService().getString(
HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_HOST, "", null).split(","); //$NON-NLS-1$ //$NON-NLS-2$
String paths[] = Platform.getPreferencesService().getString(
HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_PATH, "", null).split(","); //$NON-NLS-1$ //$NON-NLS-2$
String protocols[] = Platform.getPreferencesService().getString(
HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_PROTOCOL, "", null).split(","); //$NON-NLS-1$ //$NON-NLS-2$
String ports[] = Platform.getPreferencesService().getString(
HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_PORT, "", null).split(","); //$NON-NLS-1$ //$NON-NLS-2$
String enableds[] = Platform.getPreferencesService().getString(
HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_ICEnabled, "", null).split(","); //$NON-NLS-1$ //$NON-NLS-2$
for (int i=0;i<hosts.length;i++)
{
try{
if (enableds[i].equalsIgnoreCase("true")) //$NON-NLS-1$
{
URL url = new URL(
protocols[i]+"://"+hosts[i]+':'+ports[i]+paths[i]); //$NON-NLS-1$
sites.add(url);
}
}
catch(Exception ex){
}
}
return sites;
}
public static void clearCache() {
ConnectionCache.clear();
}
private static class ConnectionCache
{
private static ConnectionCache instance;
private Hashtable<URL, Boolean> cache;
private long start;
private ConnectionCache(){
cache = new Hashtable<URL, Boolean>();
resetTimer();
}
public void resetTimer()
{
start = new Date().getTime();
}
public static ConnectionCache getCache()
{
if (instance==null || instance.isExpired())
{
instance = new ConnectionCache();
}
return instance;
}
public static void clear()
{
instance = null;
}
public boolean isExpired()
{
long now = new Date().getTime();
return (now > start + TIMEOUT);
}
public boolean isConnected(URL url) throws CoreException
{
Boolean b = cache.get(url);
if (b==null)
throw new CoreException(new Status(IStatus.ERROR,HelpBasePlugin.PLUGIN_ID,"Cache Unavailable")); //$NON-NLS-1$
return b.booleanValue();
}
public void put(URL url,boolean connected)
{
cache.put(url,new Boolean(connected));
}
}
}
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