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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.docproc.jdisc;
import com.yahoo.collections.Tuple2;
import com.yahoo.docproc.Call;
import com.yahoo.docproc.CallStack;
import com.yahoo.docproc.impl.DocprocExecutor;
import com.yahoo.docproc.impl.DocprocService;
import com.yahoo.docproc.DocumentProcessor;
import com.yahoo.docproc.impl.HandledProcessingException;
import com.yahoo.docproc.Processing;
import java.util.logging.Level;
import com.yahoo.yolean.Exceptions;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.logging.Logger;
/**
* @author Einar M R Rosenvinge
*/
public class DocumentProcessingTask implements Runnable {
private static Logger log = Logger.getLogger(DocumentProcessingTask.class.getName());
private final List<Processing> processings = new ArrayList<>();
private final List<Processing> processingsDone = new ArrayList<>();
private final DocumentProcessingHandler docprocHandler;
private final RequestContext requestContext;
private final DocprocService service;
private final ThreadPoolExecutor executor;
public DocumentProcessingTask(RequestContext requestContext, DocumentProcessingHandler docprocHandler,
DocprocService service, ThreadPoolExecutor executor) {
this.requestContext = requestContext;
this.docprocHandler = docprocHandler;
this.service = service;
this.executor = executor;
}
void submit() {
try {
executor.execute(this);
} catch (RejectedExecutionException ree) {
queueFull();
}
}
@Override
public void run() {
try {
try {
processings.addAll(requestContext.getProcessings());
} catch (Exception e) {
log.log(Level.WARNING, "Deserialization of message failed", e);
requestContext.processingFailed(e);
return;
}
DocprocExecutor executor = service.getExecutor();
DocumentProcessor.Progress progress = process(executor);
if (DocumentProcessor.Progress.LATER.equals(progress) && !processings.isEmpty()) {
DocumentProcessor.LaterProgress laterProgress = (DocumentProcessor.LaterProgress) progress;
docprocHandler.submit(this, laterProgress.getDelay());
}
} catch (Error error) {
try {
log.log(Level.SEVERE, Exceptions.toMessageString(error), error);
} catch (Throwable t) {
// do nothing
} finally {
Runtime.getRuntime().halt(1);
}
}
}
/**
* Processes a single Processing, and fails the message if this processing fails.
*
* @param executor the DocprocService to use for processing
*/
private DocumentProcessor.Progress process(DocprocExecutor executor) {
Iterator<Processing> iterator = processings.iterator();
List<Tuple2<DocumentProcessor.Progress, Processing>> later = new ArrayList<>();
while (iterator.hasNext()) {
Processing processing = iterator.next();
iterator.remove();
if (requestContext.hasExpired()) {
DocumentProcessor.Progress progress = DocumentProcessor.Progress.FAILED;
final String location;
if (processing != null) {
final CallStack callStack = processing.callStack();
if (callStack != null) {
final Call lastPopped = callStack.getLastPopped();
if (lastPopped != null) {
location = lastPopped.toString();
} else {
location = "empty call stack or no processors popped";
}
} else {
location = "no call stack";
}
} else {
location = "no processing instance";
}
log.log(Level.FINE, () -> "Time is up for '" + processing + " failed, " + location + "'.");
requestContext.processingFailed(RequestContext.ErrorCode.ERROR_PROCESSING_FAILURE, "Time is up.");
return progress;
}
DocumentProcessor.Progress progress = DocumentProcessor.Progress.FAILED;
try {
progress = executor.process(processing);
} catch (Exception e) {
logProcessingFailure(processing, e);
requestContext.processingFailed(e);
return progress;
}
if (DocumentProcessor.Progress.LATER.equals(progress)) {
later.add(new Tuple2<>(progress, processing));
} else if (DocumentProcessor.Progress.DONE.equals(progress)) {
processingsDone.add(processing);
} else if (DocumentProcessor.Progress.FAILED.equals(progress)) {
logProcessingFailure(processing, null);
requestContext.processingFailed(RequestContext.ErrorCode.ERROR_PROCESSING_FAILURE,
progress.getReason().orElse("Document processing failed."));
return progress;
} else if (DocumentProcessor.Progress.PERMANENT_FAILURE.equals(progress)) {
logProcessingFailure(processing, null);
requestContext.processingFailed(RequestContext.ErrorCode.ERROR_PROCESSING_FAILURE,
progress.getReason().orElse("Document processing failed."));
return progress;
}
}
// Processings that have FAILED will have made this method terminate by now.
// We now have successful Processings in 'processingsDone' and
// the ones that have returned LATER in 'later'.
if (!later.isEmpty()) {
// Outdated comment:
// "if this was a multioperationmessage and more than one of the processings returned LATER,
// return the one with the lowest timeout:"
// As multioperation is removed this can probably be simplified?
DocumentProcessor.LaterProgress shortestDelay = (DocumentProcessor.LaterProgress) later.get(0).first;
for (Tuple2<DocumentProcessor.Progress, Processing> tuple : later) {
// re-add the LATER one to processings
processings.add(tuple.second);
// check to see if this one had a lower timeout than the previous one:
if (((DocumentProcessor.LaterProgress) tuple.first).getDelay() < shortestDelay.getDelay()) {
shortestDelay = (DocumentProcessor.LaterProgress) tuple.first;
}
}
return shortestDelay;
} else {
requestContext.processingDone(processingsDone);
return DocumentProcessor.Progress.DONE;
}
}
void queueFull() {
requestContext.processingFailed(RequestContext.ErrorCode.ERROR_BUSY,
"Queue temporarily full. Returning message " + requestContext +
". Will be automatically resent.");
}
@Override
public String toString() {
return "ProcessingTask{" +
"processings=" + processings +
", processingsDone=" + processingsDone +
", requestContext=" + requestContext +
'}';
}
private static void logProcessingFailure(Processing processing, Exception exception) {
//LOGGING ONLY:
String errorMsg = processing + " failed at " + processing.callStack().getLastPopped();
if (exception != null) {
if (exception instanceof HandledProcessingException) {
errorMsg += ". Error message: " + exception.getMessage();
log.log(Level.WARNING, errorMsg);
log.log(Level.FINE, "Chained exception:", exception);
} else {
log.log(Level.WARNING, errorMsg, exception);
}
} else {
log.log(Level.WARNING, errorMsg);
}
//LOGGING OF STACK TRACE:
if (exception != null) {
StringWriter backtrace = new StringWriter();
exception.printStackTrace(new PrintWriter(backtrace));
log.log(Level.FINE, () -> "Failed to process " + processing + ": " + backtrace);
}
}
}
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