在我的自定义处理器中我需要更新配置文件（它放在一个nifi文件夹中，它不是原始配置）基于我从上游连接获得的数据，但我无法获得所需的结果我应该怎么做？
我应该清理fileQueue然后创建session.commit（）吗？
FlowFile流文件; @覆盖 public void onTrigger（ProcessContext context，ProcessSession session）抛出ProcessException { final String conflictResponse = context.getProperty（CONFLICT_RESOLUTION）。getValue（）; final ArrayList value = new ArrayList＆lt;＆gt;（）;
flowfile = session.get();
if (flowfile == null) {
return;
}
value.add(flowfile.getAttribute("filename"));
session.remove(flowfile);
final File directory = new File(context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue());
final boolean keepingSourceFile = context.getProperty(KEEP_SOURCE_FILE).asBoolean();
final ComponentLog logger = getLogger();
if (fileQueue.size() < 100) {
final long pollingMillis = context.getProperty(POLLING_INTERVAL).asTimePeriod(TimeUnit.MILLISECONDS);
if ((queueLastUpdated.get() < System.currentTimeMillis() - pollingMillis) && listingLock.tryLock()) {
try {
final Set<File> listing = performListing(directory, fileFilterRef.get(), context.getProperty(RECURSE).asBoolean().booleanValue());
queueLock.lock();
try {
listing.removeAll(inProcess);
if (!keepingSourceFile) {
listing.removeAll(recentlyProcessed);
}
fileQueue.clear();
fileQueue.addAll(listing);
queueLastUpdated.set(System.currentTimeMillis());
recentlyProcessed.clear();
if (listing.isEmpty()) {
context.yield();
}
} finally {
queueLock.unlock();
}
} finally {
listingLock.unlock();
}
}
}
final int batchSize = context.getProperty(BATCH_SIZE).asInteger();
final List<File> file = new ArrayList<>(batchSize);
queueLock.lock();
try {
fileQueue.drainTo(file, batchSize);
if (file.isEmpty()) {
return;
} else {
inProcess.addAll(file);
}
} finally {
queueLock.unlock();
}
//make xml parsing
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
try {
dBuilder = dbFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
e.printStackTrace();
}
try {
File f = file.get(0);
doc = dBuilder.parse(f);
} catch (IOException e) {
e.printStackTrace();
} catch (org.xml.sax.SAXException e) {
e.printStackTrace();
}
NodeList nList = doc.getElementsByTagName("localAttributes");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
start = eElement.getElementsByTagName("start").item(0).getTextContent();
startDate = eElement.getElementsByTagName("startDate").item(0).getTextContent();
endDate = eElement.getElementsByTagName("endDate").item(0).getTextContent();
patch = eElement.getElementsByTagName("patch").item(0).getTextContent();
runAs = eElement.getElementsByTagName("runAs").item(0).getTextContent();
makeVersion = eElement.getElementsByTagName("makeVersion").item(0).getTextContent();
///parameter = eElement.getElementsByTagName("parameter").item(0).getTextContent();
}
}
final ListIterator<File> itr = file.listIterator();
FlowFile flowFile1 = null;
try {
final Path directoryPath = directory.toPath();
while (itr.hasNext()) {
final File files = itr.next();
final Path filePath = files.toPath();
final Path relativePath = directoryPath.relativize(filePath.getParent());
String relativePathString = relativePath.toString() + "/";
if (relativePathString.isEmpty()) {
relativePathString = "./";
}
final Path absPath = filePath.toAbsolutePath();
final String absPathString = absPath.getParent().toString() + "/";
flowFile1 = session.create();
final long importStart = System.nanoTime();
flowFile1 = session.importFrom(filePath, keepingSourceFile, flowFile1);
final long importNanos = System.nanoTime() - importStart;
final long importMillis = TimeUnit.MILLISECONDS.convert(importNanos, TimeUnit.NANOSECONDS);
flowFile1 = session.putAttribute(flowFile1, CoreAttributes.FILENAME.key(), files.getName());
flowFile1 = session.putAttribute(flowFile1, CoreAttributes.PATH.key(), relativePathString);
flowFile1 = session.putAttribute(flowFile1, CoreAttributes.ABSOLUTE_PATH.key(), absPathString);
Map<String, String> attributes = getAttributesFromFile(filePath);
if (attributes.size() > 0) {
flowFile1 = session.putAllAttributes(flowFile1, attributes);
}
InputStream ffStream = session.read(flowFile1);
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document xmlDocument = builder.parse(ffStream);
XPath xPath = XPathFactory.newInstance().newXPath();
XPathExpression myNodeList = (XPathExpression) xPath.compile("/localAttributes");
Node nodeGettingChanged = (Node) myNodeList.evaluate(xmlDocument, XPathConstants.NODE);
NodeList childNodes = nodeGettingChanged.getChildNodes();
boolean make=false;
for (int i = 0; i != childNodes.getLength(); ++i) {
Node child = childNodes.item(i);
if (!(child instanceof Element))
continue;
if(child.getNodeName().equals("start")){
String date;
for(int j=0;j<value.size();j++) {
if(value.get(j).length()>10){
date=value.get(j).substring(0,10);
}
else{
date=value.get(j);
}
if (date == child.getFirstChild().getTextContent()){
child.getFirstChild().setNodeValue(addOneDay(child.getFirstChild().getTextContent()));
make=true;
}
}
}
if(make){
if(child.getNodeName().equals("runAs")){
child.getFirstChild().setNodeValue("true");
}
}
}
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = null;
transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(xmlDocument);
String path = "C:/Users/user/Desktop/nifi-1.3.0/nifi-assembly/target/nifi-1.3.0-bin/nifi-1.3.0/1/conf.xml";
File f = new File(path);
StreamResult file1 = new StreamResult(f);
try {
transformer.transform(source, file1);
} catch (TransformerException e) {
e.printStackTrace();
}
session.write(flowFile1, new StreamCallback() {
@Override
public void process(InputStream inputStream, OutputStream outputStream) throws IOException {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = null;
try {
transformer = transformerFactory.newTransformer();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
}
DOMSource source = new DOMSource(xmlDocument);
ffStream.close();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
StreamResult result = new StreamResult(bos);
try {
transformer.transform(source, result);
} catch (TransformerException e) {
e.printStackTrace();
}
byte[] array = bos.toByteArray();
outputStream.write(array);
}
});
Path tempDotCopyFile = null;
try {
final Path rootDirPath = Paths.get("C://Users//user//Desktop//try2//nifi-1.3.0//1");
final Path tempCopyFile = rootDirPath.resolve("." + flowFile1.getAttribute(CoreAttributes.FILENAME.key()));
final Path copyFile = rootDirPath.resolve(flowFile1.getAttribute(CoreAttributes.FILENAME.key()));
if (!Files.exists(rootDirPath)) {
if (context.getProperty(CREATE_DIRS).asBoolean()) {
Files.createDirectories(rootDirPath);
} else {
flowFile1 = session.penalize(flowFile1);
session.transfer(flowFile1,REL_FAILURE);
logger.error("Penalizing {} and routing to 'failure' because the output directory {} does not exist and Processor is "
+ "configured not to create missing directories", new Object[]{flowFile1, rootDirPath});
return;
}
}
final Path dotCopyFile = tempCopyFile;
tempDotCopyFile = dotCopyFile;
Path finalCopyFile = copyFile;
final Path finalCopyFileDir = finalCopyFile.getParent();
if (Files.exists(finalCopyFileDir)) { // check if too many files already
final int numFiles = finalCopyFileDir.toFile().list().length;
if (numFiles >= 34) {
flowFile1 = session.penalize(flowFile1);
logger.warn("Penalizing {} and routing to 'failure' because the output directory {} has {} files, which exceeds the "
+ "configured maximum number of files", new Object[]{flowFile1, finalCopyFileDir, numFiles});
session.transfer(flowFile1,REL_FAILURE);
return;
}
}
if (Files.exists(finalCopyFile)) {
switch (conflictResponse) {
case REPLACE_RESOLUTION:
Files.delete(finalCopyFile);
logger.info("Deleted {} as configured in order to replace with the contents of {}", new Object[]{finalCopyFile, flowFile1});
break;
case IGNORE_RESOLUTION:
session.transfer(flowFile1, REL_SUCCESS);
logger.info("Transferring {} to success because file with same name already exists", new Object[]{flowFile1});
return;
case FAIL_RESOLUTION:
flowFile1 = session.penalize(flowFile1);
logger.warn("Penalizing {} and routing to failure as configured because file with the same name already exists", new Object[]{flowFile1});
session.transfer(flowFile1,REL_FAILURE);
return;
default:
break;
}
}
session.exportTo(flowFile1, dotCopyFile, false);
final String permissions = "-rwxrwx---";
if (permissions != null && !permissions.trim().isEmpty()) {
try {
String perms = stringPermissions(permissions);
if (!perms.isEmpty()) {
Files.setPosixFilePermissions(dotCopyFile, PosixFilePermissions.fromString(perms));
}
} catch (Exception e) {
logger.warn("Could not set file permissions to {} because {}", new Object[]{permissions, e});
}
}
boolean renamed = false;
for (int i = 0; i < 10; i++) { // try rename up to 10 times.
if (dotCopyFile.toFile().renameTo(finalCopyFile.toFile())) {
renamed = true;
break;// rename was successful
}
Thread.sleep(100L);// try waiting a few ms to let whatever might cause rename failure to resolve
}
if (!renamed) {
if (Files.exists(dotCopyFile) && dotCopyFile.toFile().delete()) {
logger.debug("Deleted dot copy file {}", new Object[]{dotCopyFile});
}
throw new ProcessException("Could not rename: " + dotCopyFile);
} else {
logger.info("Produced copy of {} at location {}", new Object[]{flowFile1, finalCopyFile});
}
/*session.getProvenanceReporter().send(flowFile, finalCopyFile.toFile().toURI().toString(), stopWatch.getElapsed(TimeUnit.MILLISECONDS));
session.transfer(flowFile, REL_SUCCESS);*/
session.getProvenanceReporter().receive(flowFile1, files.toURI().toString(), importMillis);
//session.transfer(flowFile1, REL_SUCCESS);
session.remove(flowFile1);
} catch (final Throwable t) {
if (tempDotCopyFile != null) {
try {
Files.deleteIfExists(tempDotCopyFile);
} catch (final Exception e) {
logger.error("Unable to remove temporary file {} due to {}", new Object[]{tempDotCopyFile, e});
}
}
flowFile1 = session.penalize(flowFile1);
logger.error("Penalizing {} and transferring to failure due to {}", new Object[]{flowFile1, t});
session.transfer(flowFile1,REL_FAILURE);
}
}
if (!isScheduled()) { // if processor stopped, put the rest of the files back on the queue.
queueLock.lock();
try {
while (itr.hasNext()) {
final File nextFile = itr.next();
fileQueue.add(nextFile);
inProcess.remove(nextFile);
}
} finally {
queueLock.unlock();
}
}
} catch (IOException e1) {
e1.printStackTrace();
} catch (TransformerConfigurationException e1) {
e1.printStackTrace();
} catch (ParserConfigurationException e1) {
e1.printStackTrace();
} catch (XPathExpressionException e1) {
e1.printStackTrace();
} catch (org.xml.sax.SAXException e) {
e.printStackTrace();
}
session.commit();
}