public NiFi(final NiFiProperties properties)
throws ClassNotFoundException, IOException, NoSuchMethodException, InstantiationException,
IllegalAccessException, IllegalArgumentException, InvocationTargetException {
Thread.setDefaultUncaughtExceptionHandler(
new UncaughtExceptionHandler() {
@Override
public void uncaughtException(final Thread t, final Throwable e) {
logger.error("An Unknown Error Occurred in Thread {}: {}", t, e.toString());
logger.error("", e);
}
});
// register the shutdown hook
Runtime.getRuntime()
.addShutdownHook(
new Thread(
new Runnable() {
@Override
public void run() {
// shutdown the jetty server
shutdownHook();
}
}));
final String bootstrapPort = System.getProperty(BOOTSTRAP_PORT_PROPERTY);
if (bootstrapPort != null) {
try {
final int port = Integer.parseInt(bootstrapPort);
if (port < 1 || port > 65535) {
throw new RuntimeException(
"Failed to start NiFi because system property '"
+ BOOTSTRAP_PORT_PROPERTY
+ "' is not a valid integer in the range 1 - 65535");
}
bootstrapListener = new BootstrapListener(this, port);
bootstrapListener.start();
} catch (final NumberFormatException nfe) {
throw new RuntimeException(
"Failed to start NiFi because system property '"
+ BOOTSTRAP_PORT_PROPERTY
+ "' is not a valid integer in the range 1 - 65535");
}
} else {
logger.info(
"NiFi started without Bootstrap Port information provided; will not listen for requests from Bootstrap");
bootstrapListener = null;
}
// delete the web working dir - if the application does not start successfully
// the web app directories might be in an invalid state. when this happens
// jetty will not attempt to re-extract the war into the directory. by removing
// the working directory, we can be assured that it will attempt to extract the
// war every time the application starts.
File webWorkingDir = properties.getWebWorkingDirectory();
FileUtils.deleteFilesInDirectory(webWorkingDir, null, logger, true, true);
FileUtils.deleteFile(webWorkingDir, logger, 3);
detectTimingIssues();
// redirect JUL log events
SLF4JBridgeHandler.removeHandlersForRootLogger();
SLF4JBridgeHandler.install();
// expand the nars
final ExtensionMapping extensionMapping = NarUnpacker.unpackNars(properties);
// load the extensions classloaders
NarClassLoaders.getInstance()
.init(
properties.getFrameworkWorkingDirectory(), properties.getExtensionsWorkingDirectory());
// load the framework classloader
final ClassLoader frameworkClassLoader =
NarClassLoaders.getInstance().getFrameworkClassLoader();
if (frameworkClassLoader == null) {
throw new IllegalStateException("Unable to find the framework NAR ClassLoader.");
}
// discover the extensions
ExtensionManager.discoverExtensions(NarClassLoaders.getInstance().getExtensionClassLoaders());
ExtensionManager.logClassLoaderMapping();
DocGenerator.generate(properties);
// load the server from the framework classloader
Thread.currentThread().setContextClassLoader(frameworkClassLoader);
Class<?> jettyServer =
Class.forName("org.apache.nifi.web.server.JettyServer", true, frameworkClassLoader);
Constructor<?> jettyConstructor = jettyServer.getConstructor(NiFiProperties.class);
final long startTime = System.nanoTime();
nifiServer = (NiFiServer) jettyConstructor.newInstance(properties);
nifiServer.setExtensionMapping(extensionMapping);
if (shutdown) {
logger.info("NiFi has been shutdown via NiFi Bootstrap. Will not start Controller");
} else {
nifiServer.start();
if (bootstrapListener != null) {
bootstrapListener.sendStartedStatus(true);
}
final long endTime = System.nanoTime();
logger.info("Controller initialization took " + (endTime - startTime) + " nanoseconds.");
}
}
/** Should be called at most once. */
private InitContext load(final File frameworkWorkingDir, final File extensionsWorkingDir)
throws IOException, ClassNotFoundException {
// get the system classloader
final ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
// find all nar files and create class loaders for them.
final Map<String, ClassLoader> extensionDirectoryClassLoaderLookup = new LinkedHashMap<>();
final Map<String, ClassLoader> narIdClassLoaderLookup = new HashMap<>();
// make sure the nar directory is there and accessible
FileUtils.ensureDirectoryExistAndCanAccess(frameworkWorkingDir);
FileUtils.ensureDirectoryExistAndCanAccess(extensionsWorkingDir);
final List<File> narWorkingDirContents = new ArrayList<>();
final File[] frameworkWorkingDirContents = frameworkWorkingDir.listFiles();
if (frameworkWorkingDirContents != null) {
narWorkingDirContents.addAll(Arrays.asList(frameworkWorkingDirContents));
}
final File[] extensionsWorkingDirContents = extensionsWorkingDir.listFiles();
if (extensionsWorkingDirContents != null) {
narWorkingDirContents.addAll(Arrays.asList(extensionsWorkingDirContents));
}
if (!narWorkingDirContents.isEmpty()) {
final List<NarDetails> narDetails = new ArrayList<>();
// load the nar details which includes and nar dependencies
for (final File unpackedNar : narWorkingDirContents) {
final NarDetails narDetail = getNarDetails(unpackedNar);
// ensure the nar contained an identifier
if (narDetail.getNarId() == null) {
logger.warn("No NAR Id found. Skipping: " + unpackedNar.getAbsolutePath());
continue;
}
// store the nar details
narDetails.add(narDetail);
}
// attempt to locate the jetty nar
ClassLoader jettyClassLoader = null;
for (final Iterator<NarDetails> narDetailsIter = narDetails.iterator();
narDetailsIter.hasNext(); ) {
final NarDetails narDetail = narDetailsIter.next();
// look for the jetty nar
if (JETTY_NAR_ID.equals(narDetail.getNarId())) {
// create the jetty classloader
jettyClassLoader =
createNarClassLoader(narDetail.getNarWorkingDirectory(), systemClassLoader);
// remove the jetty nar since its already loaded
narIdClassLoaderLookup.put(narDetail.getNarId(), jettyClassLoader);
narDetailsIter.remove();
break;
}
}
// ensure the jetty nar was found
if (jettyClassLoader == null) {
throw new IllegalStateException("Unable to locate Jetty bundle.");
}
int narCount;
do {
// record the number of nars to be loaded
narCount = narDetails.size();
// attempt to create each nar class loader
for (final Iterator<NarDetails> narDetailsIter = narDetails.iterator();
narDetailsIter.hasNext(); ) {
final NarDetails narDetail = narDetailsIter.next();
final String narDependencies = narDetail.getNarDependencyId();
// see if this class loader is eligible for loading
ClassLoader narClassLoader = null;
if (narDependencies == null) {
narClassLoader =
createNarClassLoader(narDetail.getNarWorkingDirectory(), jettyClassLoader);
} else if (narIdClassLoaderLookup.containsKey(narDetail.getNarDependencyId())) {
narClassLoader =
createNarClassLoader(
narDetail.getNarWorkingDirectory(),
narIdClassLoaderLookup.get(narDetail.getNarDependencyId()));
}
// if we were able to create the nar class loader, store it and remove the details
if (narClassLoader != null) {
extensionDirectoryClassLoaderLookup.put(
narDetail.getNarWorkingDirectory().getCanonicalPath(), narClassLoader);
narIdClassLoaderLookup.put(narDetail.getNarId(), narClassLoader);
narDetailsIter.remove();
}
}
// attempt to load more if some were successfully loaded this iteration
} while (narCount != narDetails.size());
// see if any nars couldn't be loaded
for (final NarDetails narDetail : narDetails) {
logger.warn(
String.format(
"Unable to resolve required dependency '%s'. Skipping NAR %s",
narDetail.getNarDependencyId(),
narDetail.getNarWorkingDirectory().getAbsolutePath()));
}
}
return new InitContext(
frameworkWorkingDir,
extensionsWorkingDir,
narIdClassLoaderLookup.get(FRAMEWORK_NAR_ID),
new LinkedHashMap<>(extensionDirectoryClassLoaderLookup));
}