/*
* Sone - SoneRescuer.java - Copyright © 2011–2013 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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.pterodactylus.sone.core;
import net.pterodactylus.sone.data.Sone;
import net.pterodactylus.util.service.AbstractService;
import freenet.keys.FreenetURI;
/**
* The Sone rescuer downloads older editions of a Sone and updates the currently
* stored Sone with it.
*
* @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
public class SoneRescuer extends AbstractService {
/** The core. */
private final Core core;
/** The Sone downloader. */
private final SoneDownloader soneDownloader;
/** The Sone being rescued. */
private final Sone sone;
/** Whether the rescuer is currently fetching a Sone. */
private volatile boolean fetching;
/** The currently tried edition. */
private volatile long currentEdition;
/** Whether the last fetch was successful. */
private volatile boolean lastFetchSuccessful = true;
/**
* Creates a new Sone rescuer.
*
* @param core
* The core
* @param soneDownloader
* The Sone downloader
* @param sone
* The Sone to rescue
*/
public SoneRescuer(Core core, SoneDownloader soneDownloader, Sone sone) {
super("Sone Rescuer for " + sone.getName());
this.core = core;
this.soneDownloader = soneDownloader;
this.sone = sone;
currentEdition = sone.getRequestUri().getEdition();
}
//
// ACCESSORS
//
/**
* Returns whether the Sone rescuer is currently fetching a Sone.
*
* @return {@code true} if the Sone rescuer is currently fetching a Sone
*/
public boolean isFetching() {
return fetching;
}
/**
* Returns the edition that is currently being downloaded.
*
* @return The edition that is currently being downloaded
*/
public long getCurrentEdition() {
return currentEdition;
}
/**
* Returns whether the Sone rescuer can download a next edition.
*
* @return {@code true} if the Sone rescuer can download a next edition,
* {@code false} if the last edition was already tried
*/
public boolean hasNextEdition() {
return currentEdition > 0;
}
/**
* Returns the next edition the Sone rescuer can download.
*
* @return The next edition the Sone rescuer can download
*/
public long getNextEdition() {
return currentEdition - 1;
}
/**
* Sets the edition to rescue.
*
* @param edition
* The edition to rescue
* @return This Sone rescuer
*/
public SoneRescuer setEdition(long edition) {
currentEdition = edition;
return this;
}
/**
* Sets whether the last fetch was successful.
*
* @return {@code true} if the last fetch was successful, {@code false}
* otherwise
*/
public boolean isLastFetchSuccessful() {
return lastFetchSuccessful;
}
//
// ACTIONS
//
/**
* Starts the next fetch. If you want to fetch a different edition than “the
* next older one,” remember to call {@link #setEdition(long)} before
* calling this method.
*/
public void startNextFetch() {
fetching = true;
notifySyncObject();
}
//
// SERVICE METHODS
//
/**
* {@inheritDoc}
*/
@Override
protected void serviceRun() {
while (!shouldStop()) {
while (!shouldStop() && !fetching) {
sleep();
}
if (fetching) {
core.lockSone(sone);
FreenetURI soneUri = sone.getRequestUri().setKeyType("SSK").setDocName("Sone-" + currentEdition).setMetaString(new String[] { "sone.xml" });
System.out.println("URI: " + soneUri);
Sone fetchedSone = soneDownloader.fetchSone(sone, soneUri, true);
System.out.println("Sone: " + fetchedSone);
lastFetchSuccessful = (fetchedSone != null);
if (lastFetchSuccessful) {
core.updateSone(fetchedSone, true);
}
fetching = false;
}
}
}
}