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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.apache.nifi.nar;
import org.apache.nifi.bundle.Bundle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.Executors;
/**
* Uses the Java executor service scheduler to continuously load new DCAE jars
*/
public class DCAEAutoLoader {
private static final Logger LOGGER = LoggerFactory.getLogger(DCAEAutoLoader.class);
private static final long POLL_INTERVAL_MS = 5000;
/**
* Runnable task that grabs list of remotely stored jars, identifies ones that haven't
* been processed, builds Nifi bundles for those unprocessed ones and loads them into
* the global extension manager.
*/
private static class LoaderTask implements Runnable {
private static final Logger LOGGER = LoggerFactory.getLogger(LoaderTask.class);
private final URI indexJsonDcaeJars;
private final ExtensionDiscoveringManager extensionManager;
private final Set<URL> processed = new LinkedHashSet();
private LoaderTask(URI indexJsonDcaeJars, ExtensionDiscoveringManager extensionManager) {
this.indexJsonDcaeJars = indexJsonDcaeJars;
this.extensionManager = extensionManager;
}
@Override
public void run() {
try {
List<URL> toProcess = DCAEClassLoaders.getDCAEJarsURLs(this.indexJsonDcaeJars);
toProcess.removeAll(processed);
if (!toProcess.isEmpty()) {
Set<Bundle> bundles = DCAEClassLoaders.createDCAEBundles(toProcess);
this.extensionManager.discoverExtensions(bundles);
processed.addAll(toProcess);
LOGGER.info(String.format("#Added DCAE bundles: %d, #Total DCAE bundles: %d ",
bundles.size(), processed.size()));
}
} catch (final Exception e) {
LOGGER.error("Error loading DCAE jars due to: " + e.getMessage(), e);
}
}
}
private final ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
private ScheduledFuture taskFuture;
public synchronized void start(URI indexJsonDcaeJars, final ExtensionDiscoveringManager extensionManager) {
// Restricting to a single thread
if (taskFuture != null && !taskFuture.isCancelled()) {
return;
}
LOGGER.info("Starting DCAE Auto-Loader: {}", new Object[]{indexJsonDcaeJars});
LoaderTask task = new LoaderTask(indexJsonDcaeJars, extensionManager);
this.taskFuture = executor.scheduleAtFixedRate(task, 0, POLL_INTERVAL_MS, TimeUnit.MILLISECONDS);
LOGGER.info("DCAE Auto-Loader started");
}
public synchronized void stop() {
if (this.taskFuture != null) {
this.taskFuture.cancel(true);
LOGGER.info("DCAE Auto-Loader stopped");
}
}
}
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