/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of 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.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.artifact.maven;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.concurrent.CountDownLatch;
import org.apache.maven.settings.building.SettingsBuildingException;
import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.collection.DependencyCollectionException;
import org.eclipse.aether.resolution.ArtifactResolutionException;
import org.eclipse.aether.resolution.DependencyResolutionException;
import org.smallmind.nutsnbolts.lang.ClassGate;
import org.smallmind.nutsnbolts.lang.ClasspathClassGate;
import org.smallmind.nutsnbolts.lang.GatingClassLoader;
import org.smallmind.nutsnbolts.time.Duration;
import org.smallmind.scribe.pen.LoggerManager;
public class MavenScanner {
private static enum State {STARTED, STOPPED}
private final LinkedList<MavenScannerListener> listenerList = new LinkedList<>();
private final Duration cycleDuration;
private final MavenRepository mavenRepository;
private final MavenCoordinate[] mavenCoordinates;
private final ArtifactTag[] artifactTags;
private ScannerWorker scannerWorker;
private State state = State.STOPPED;
public MavenScanner (String repositoryId, boolean offline, Duration cycleDuration, MavenCoordinate... mavenCoordinates)
throws SettingsBuildingException {
this(new MavenRepository(repositoryId, offline), cycleDuration, mavenCoordinates);
}
public MavenScanner (String settingsDirectory, String repositoryId, boolean offline, Duration cycleDuration, MavenCoordinate... mavenCoordinates)
throws SettingsBuildingException {
this(new MavenRepository(settingsDirectory, repositoryId, offline), cycleDuration, mavenCoordinates);
}
private MavenScanner (MavenRepository mavenRepository, Duration cycleDuration, MavenCoordinate... mavenCoordinates) {
if (cycleDuration == null) {
throw new IllegalArgumentException("Must provide a cycle duration");
}
if (mavenCoordinates == null) {
throw new IllegalArgumentException("Must provide some maven coordinates");
}
this.mavenRepository = mavenRepository;
this.cycleDuration = cycleDuration;
this.mavenCoordinates = mavenCoordinates;
artifactTags = new ArtifactTag[mavenCoordinates.length];
}
public synchronized void addMavenScannerListener (MavenScannerListener listener) {
listenerList.add(listener);
}
public synchronized void removeMavenScannerListener (MavenScannerListener listener) {
listenerList.remove(listener);
}
public synchronized void start ()
throws SettingsBuildingException, DependencyCollectionException, DependencyResolutionException, ArtifactResolutionException {
if (state.equals(State.STOPPED)) {
Thread workerThread;
updateArtifact();
workerThread = new Thread(scannerWorker = new ScannerWorker());
workerThread.setDaemon(true);
workerThread.start();
state = State.STARTED;
}
}
public synchronized void stop ()
throws InterruptedException {
if (state.equals(State.STARTED)) {
if (scannerWorker != null) {
scannerWorker.stop();
}
state = State.STOPPED;
}
}
private synchronized void updateArtifact ()
throws SettingsBuildingException, DependencyCollectionException, DependencyResolutionException, ArtifactResolutionException {
DefaultRepositorySystemSession session = mavenRepository.generateSession();
MavenScannerEvent event;
HashMap<Artifact, Artifact> artifactDeltaMap = new HashMap<>();
HashSet<Artifact> dependentArtifactSet = new HashSet<>();
LinkedList<ClassGate> classGateList = new LinkedList<>();
for (int index = 0; index < mavenCoordinates.length; index++) {
ArtifactTag currentArtifactTag = new ArtifactTag(mavenRepository.acquireArtifact(session, mavenCoordinates[index]));
if (!currentArtifactTag.equals(artifactTags[index])) {
Artifact[] dependentArtifacts = mavenRepository.resolve(session, currentArtifactTag.getArtifact());
for (Artifact dependentArtifact : dependentArtifacts) {
if (dependentArtifactSet.add(dependentArtifact)) {
classGateList.add(new ClasspathClassGate(dependentArtifact.getFile().getAbsolutePath()));
}
}
artifactDeltaMap.put(currentArtifactTag.getArtifact(), (artifactTags[index] == null) ? null : artifactTags[index].getArtifact());
artifactTags[index] = currentArtifactTag;
}
}
if (!classGateList.isEmpty()) {
GatingClassLoader gatingClassLoader;
ClassGate[] classGates;
classGates = new ClassGate[classGateList.size()];
classGateList.toArray(classGates);
gatingClassLoader = new GatingClassLoader(Thread.currentThread().getContextClassLoader(), -1, classGates);
event = new MavenScannerEvent(this, artifactDeltaMap, artifactTags, gatingClassLoader);
for (MavenScannerListener listener : listenerList) {
listener.artifactChange(event);
}
}
}
@Override
protected void finalize ()
throws InterruptedException {
stop();
}
private class ScannerWorker implements Runnable {
private CountDownLatch finishLatch = new CountDownLatch(1);
private CountDownLatch exitLatch = new CountDownLatch(1);
public void stop ()
throws InterruptedException {
finishLatch.countDown();
exitLatch.await();
}
@Override
public void run () {
try {
do {
try {
updateArtifact();
} catch (Exception exception) {
LoggerManager.getLogger(MavenScanner.class).error(exception);
}
} while (!finishLatch.await(cycleDuration.getTime(), cycleDuration.getTimeUnit()));
} catch (InterruptedException interruptedException) {
finishLatch.countDown();
} finally {
exitLatch.countDown();
}
}
}
}