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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.impl;
import com.yahoo.docproc.Call;
import com.yahoo.docproc.CallStack;
import com.yahoo.docproc.DocumentProcessor;
import com.yahoo.docproc.Processing;
import com.yahoo.document.DocumentOperation;
import com.yahoo.document.DocumentPut;
import com.yahoo.document.json.JsonWriter;
import com.yahoo.jdisc.Metric;
import com.yahoo.text.Utf8;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.logging.Logger;
import static java.util.stream.Collectors.counting;
import static java.util.stream.Collectors.groupingBy;
/**
* An executor executed incoming processings on its CallStack
*
* @author Einar M R Rosenvinge
*/
public class DocprocExecutor {
private final static String METRIC_NAME_DOCUMENTS_PROCESSED = "documents_processed";
private static final Logger log = Logger.getLogger(DocprocExecutor.class.getName());
private final String name;
private final String docCounterName;
private final Metric metric;
private final Function<String, Metric.Context> contexts;
private final CallStack callStack;
/**
* Creates a new named DocprocExecutor with the given CallStack.
*
* @param name the name of this executor
* @param callStack the chain of document processors this executor shall execute on processings
*/
public DocprocExecutor(String name, CallStack callStack) {
this.name = name;
String chainDimension = name != null ? name.replaceAll("[^\\p{Alnum}]", "_") : name;
docCounterName = "chain_" + chainDimension + "_documents";
this.metric = callStack.getMetric();
this.callStack = callStack;
this.callStack.setName(name);
this.contexts = cachedContexts(chainDimension);
}
/**
* Creates a new named DocprocExecutor, with the same instance variables as the given executor,
* but a new call stack.
*
* @param oldExecutor the executor to inherit the instance variables from, sans call stack.
* @param callStack the call stack to use.
*/
public DocprocExecutor(DocprocExecutor oldExecutor, CallStack callStack) {
this.name = oldExecutor.name;
this.docCounterName = oldExecutor.docCounterName;
this.metric = oldExecutor.metric;
this.contexts = oldExecutor.contexts;
this.callStack = callStack;
}
public CallStack getCallStack() {
return callStack;
}
public String getName() {
return name;
}
private void incrementNumDocsProcessed(Processing processing) {
List<DocumentOperation> operations = ((ProcessingAccess)processing).getOnceOperationsToBeProcessed();
if ( ! operations.isEmpty()) {
metric.add(docCounterName, operations.size(), null);
operations.stream()
.collect(groupingBy(operation -> operation.getId().getDocType(), counting()))
.forEach((type, count) -> metric.add(METRIC_NAME_DOCUMENTS_PROCESSED, count, contexts.apply(type)));
}
}
/**
* Processes a given Processing through the CallStack of this executor.
*
* @param processing the Processing to process. The CallStack of the Processing will be set to a clone of the CallStack of this executor, iff. it is currently null.
* @return a Progress; if this is LATER, the Processing is not done and must be reprocessed later.
* @throws RuntimeException if a document processor throws an exception during processing.
* @see com.yahoo.docproc.Processing
*/
public DocumentProcessor.Progress process(Processing processing) {
processing.setServiceName(getName());
if (processing.callStack() == null) {
((ProcessingAccess)processing).setCallStack(new CallStack(getCallStack()));
}
DocumentProcessor.Progress progress = DocumentProcessor.Progress.DONE;
//metrics stuff:
//TODO: Note that this is *wrong* in case of Progress.LATER, documents are then counted several times until the Processing is DONE or FAILED.
incrementNumDocsProcessed(processing);
do {
Call call = processing.callStack().pop();
if (call == null) {
// No more processors - done
return progress;
}
//might throw exception, which is OK:
progress = call.call(processing);
if (log.isLoggable(Level.FINEST)) {
logProgress(processing, progress, call);
}
if (DocumentProcessor.Progress.LATER.equals(progress)) {
processing.callStack().addNext(call);
return progress;
}
} while (DocumentProcessor.Progress.DONE.equals(progress));
return progress;
}
private void logProgress(Processing processing, DocumentProcessor.Progress progress, Call call) {
StringBuilder message = new StringBuilder();
boolean first = true;
message.append(call.getDocumentProcessorId()).append(" of class ")
.append(call.getDocumentProcessor().getClass().getSimpleName()).append(" returned ").append(progress)
.append(" for the documents: [");
for (DocumentOperation op : processing.getDocumentOperations()) {
if (first) {
first = false;
} else {
message.append(", ");
}
if (op instanceof DocumentPut) {
message.append(Utf8.toString(JsonWriter.toByteArray(((DocumentPut) op).getDocument())));
} else {
message.append(op.toString());
}
}
message.append("]");
log.log(Level.FINEST, message.toString());
}
/**
* Processes a given Processing through the CallStack of this executor. Note that if a DocumentProcessor
* returns a LaterProgress for this processing, it will be re-processed (after waiting the specified delay given
* by the LaterProgress), until done or failed.
*
* @param processing the Processing to process. The CallStack of the Processing will be set to a clone of the CallStack of this executor, iff. it is currently null.
* @return a Progress; this is never a LaterProgress.
* @throws RuntimeException if a document processor throws an exception during processing, or this thread is interrupted while waiting.
* @see com.yahoo.docproc.Processing
* @see com.yahoo.docproc.DocumentProcessor.Progress
* @see com.yahoo.docproc.DocumentProcessor.LaterProgress
*/
public DocumentProcessor.Progress processUntilDone(Processing processing) {
DocumentProcessor.Progress progress;
while (true) {
progress = process(processing);
if (!(progress instanceof DocumentProcessor.LaterProgress)) {
break;
}
DocumentProcessor.LaterProgress later = (DocumentProcessor.LaterProgress) progress;
try {
Thread.sleep(later.getDelay());
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
}
return progress;
}
private Function<String, Metric.Context> cachedContexts(String chainDimension) {
Map<String, Metric.Context> contextCache = new ConcurrentHashMap<>();
return documentType -> contextCache.computeIfAbsent(documentType, type -> {
Map<String, String> dimensions = new HashMap<>(2);
dimensions.put("chain", chainDimension);
dimensions.put("documenttype", type);
return metric.createContext(dimensions);
});
}
}
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