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package de.lmu.ifi.dbs.elki.logging.progress;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* Class to keep track of "alive" progresses.
*
* @author Erich Schubert
*
* @apiviz.uses Progress oneway - - tracks
*/
public class ProgressTracker {
/**
* Set of potentially active progresses.
*/
private ArrayList<WeakReference<Progress>> progresses = new ArrayList<>();
/**
* Get a list of progresses tracked.
*
* @return List of progresses.
*/
public synchronized Collection<Progress> getProgresses() {
List<Progress> list = new ArrayList<>(progresses.size());
Iterator<WeakReference<Progress>> iter = progresses.iterator();
while(iter.hasNext()) {
WeakReference<Progress> ref = iter.next();
if(ref.get() == null) {
iter.remove();
}
else {
list.add(ref.get());
}
}
return list;
}
/**
* Add a new Progress to the tracker.
*
* @param p Progress
*/
public synchronized void addProgress(Progress p) {
// Don't add more than once.
Iterator<WeakReference<Progress>> iter = progresses.iterator();
while(iter.hasNext()) {
WeakReference<Progress> ref = iter.next();
// since we are at it anyway, remove old links.
if(ref.get() == null) {
iter.remove();
}
else {
if(ref.get() == p) {
return;
}
}
}
progresses.add(new WeakReference<>(p));
}
/**
* Remove completed progresses.
*
* @return List of progresses removed.
*/
public synchronized Collection<Progress> removeCompleted() {
List<Progress> list = new ArrayList<>(progresses.size());
Iterator<WeakReference<Progress>> iter = progresses.iterator();
while(iter.hasNext()) {
WeakReference<Progress> ref = iter.next();
if(ref.get() == null) {
iter.remove();
}
else {
if(ref.get().isComplete()) {
list.add(ref.get());
iter.remove();
}
}
}
return list;
}
}
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