org.apache.karaf.features.internal.download.impl.MavenDownloadManager Maven / Gradle / Ivy
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This bundle is the core implementation of the Karaf features support.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.karaf.features.internal.download.impl;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import org.apache.karaf.features.internal.download.DownloadCallback;
import org.apache.karaf.features.internal.download.DownloadManager;
import org.apache.karaf.features.internal.download.Downloader;
import org.apache.karaf.features.internal.download.StreamProvider;
import org.apache.karaf.features.internal.util.MultiException;
import org.ops4j.pax.url.mvn.MavenResolver;
public class MavenDownloadManager implements DownloadManager {
protected final MavenResolver mavenResolver;
protected final ScheduledExecutorService executorService;
protected final long scheduleDelay;
protected final int scheduleMaxRun;
protected File tmpPath;
private final Map downloaded = new HashMap<>();
private final Map downloading = new HashMap<>();
private final Object lock = new Object();
private volatile int allPending = 0;
public MavenDownloadManager(MavenResolver mavenResolver, ScheduledExecutorService executorService,
long scheduleDelay, int scheduleMaxRun) {
this.mavenResolver = mavenResolver;
this.executorService = executorService;
this.scheduleDelay = scheduleDelay;
this.scheduleMaxRun = scheduleMaxRun;
String karafRoot = System.getProperty("karaf.home", "karaf");
String karafData = System.getProperty("karaf.data", karafRoot + "/data");
this.tmpPath = new File(karafData, "tmp");
}
public int getPending() {
return allPending;
}
@Override
public Downloader createDownloader() {
return new MavenDownloader();
}
@SuppressWarnings({
"unchecked", "rawtypes"
})
@Override
public Map getProviders() {
return (Map) Collections.synchronizedMap(downloaded);
}
@Override
public void close() {
executorService.shutdown();
}
protected class MavenDownloader implements Downloader {
private volatile int pending = 0;
private final MultiException exception = new MultiException("Error");
public int pending() {
return pending;
}
@Override
public void await() throws InterruptedException, MultiException {
synchronized (lock) {
while (pending != 0) {
lock.wait();
}
}
exception.throwIfExceptions();
}
@Override
public void download(final String location, final DownloadCallback downloadCallback) throws MalformedURLException {
AbstractDownloadTask task;
synchronized (lock) {
task = downloaded.get(location);
if (task == null) {
task = downloading.get(location);
}
}
if (task == null) {
task = createDownloadTask(location);
}
synchronized (lock) {
AbstractDownloadTask prev = downloaded.get(location);
if (prev == null) {
prev = downloading.get(location);
}
if (prev == null) {
downloading.put(location, task);
executorService.execute(task);
} else {
task = prev;
}
pending++;
allPending++;
}
final AbstractDownloadTask downloadTask = task;
task.addListener(future -> {
try {
// Call the callback
if (downloadCallback != null) {
downloadCallback.downloaded(downloadTask);
}
// Make sure we log any download error if the callback suppressed it
downloadTask.getFile();
} catch (Throwable e) {
exception.addSuppressed(e);
} finally {
synchronized (lock) {
downloading.remove(location);
downloaded.put(location, downloadTask);
--allPending;
if (--pending == 0) {
lock.notifyAll();
}
}
}
});
}
protected AbstractDownloadTask createDownloadTask(String url) {
AbstractDownloadTask task = doCreateDownloadTask(url);
if (task instanceof AbstractRetryableDownloadTask) {
AbstractRetryableDownloadTask rt = (AbstractRetryableDownloadTask) task;
if (scheduleDelay > 0) {
rt.setScheduleDelay(scheduleDelay);
}
if (scheduleMaxRun > 0) {
rt.setScheduleMaxRun(scheduleMaxRun);
}
}
return task;
}
protected AbstractDownloadTask doCreateDownloadTask(final String url) {
final String mvnUrl = DownloadManagerHelper.stripUrl(url);
if (mvnUrl.startsWith("mvn:")) {
if (!mvnUrl.equals(url)) {
return new ChainedDownloadTask(executorService, url, mvnUrl);
} else {
return new MavenDownloadTask(executorService, mavenResolver, mvnUrl);
}
} else {
return createCustomDownloadTask(url);
}
}
class ChainedDownloadTask extends AbstractDownloadTask {
private String innerUrl;
public ChainedDownloadTask(ScheduledExecutorService executorService, String url, String innerUrl) {
super(executorService, url);
this.innerUrl = innerUrl;
}
@Override
public void run() {
try {
MavenDownloader.this.download(innerUrl, provider -> {
try {
AbstractDownloadTask future = (AbstractDownloadTask) provider;
String file = future.getFile().toURI().toURL().toExternalForm();
String real = url.replace(innerUrl, file);
MavenDownloader.this.download(real, provider1 -> {
try {
setFile(provider1.getFile());
} catch (IOException e) {
setException(e);
} catch (Throwable t) {
setException(new IOException(t));
}
});
} catch (IOException e) {
setException(e);
} catch (Throwable t) {
setException(new IOException(t));
}
});
} catch (IOException e) {
setException(e);
} catch (Throwable t) {
setException(new IOException(t));
}
}
}
}
protected AbstractDownloadTask createCustomDownloadTask(final String url) {
return new SimpleDownloadTask(executorService, url, tmpPath);
}
}