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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.feedapi;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.LinkedList;
import java.util.List;
import javax.xml.stream.XMLStreamException;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.vespaxmlparser.FeedOperation;
import com.yahoo.vespaxmlparser.FeedReader;
/**
* Base class for unpacking document operation streams and pushing to feed
* access points.
*
* @author Thomas Gundersen
* @author steinar
*/
public abstract class Feeder {
protected final InputStream stream;
protected final DocumentTypeManager docMan;
protected List<String> errors = new LinkedList<>();
private boolean doAbort = true;
private boolean createIfNonExistent = false;
private final VespaFeedSender sender;
private static final int MAX_ERRORS = 10;
protected Feeder(DocumentTypeManager docMan, VespaFeedSender sender, InputStream stream) {
this.docMan = docMan;
this.sender = sender;
this.stream = stream;
}
public void setAbortOnDocumentError(boolean doAbort) {
this.doAbort = doAbort;
}
public void setCreateIfNonExistent(boolean value) {
this.createIfNonExistent = value;
}
private void addException(Exception e) {
String message;
if (e.getMessage() != null) {
message = e.getMessage().replaceAll("\"", "'");
} else {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
e.printStackTrace(pw);
message = "(no message) " + sw.toString();
}
addError("ERROR: " + message);
}
private void addError(String error) {
if (errors.size() < MAX_ERRORS) {
errors.add(error);
} else if (errors.size() == MAX_ERRORS) {
errors.add("Reached maximum limit of errors (" + MAX_ERRORS + "). Not collecting any more.");
}
}
protected abstract FeedReader createReader() throws Exception;
public List<String> parse() {
FeedReader reader;
try {
reader = createReader();
} catch (Exception e) {
addError("ERROR: " + e.getClass().toString() + ": " + e.getMessage().replaceAll("\"", "'"));
return errors;
}
while (!sender.isAborted()) {
try {
FeedOperation op = reader.read();
if (createIfNonExistent && op.getDocumentUpdate() != null) {
op.getDocumentUpdate().setCreateIfNonExistent(true);
}
// Done feeding.
if (op.getType() == FeedOperation.Type.INVALID) {
break;
} else {
sender.sendOperation(op);
}
} catch (XMLStreamException e) {
addException(e);
break;
} catch (NullPointerException e) {
addException(e);
break;
} catch (Exception e) {
addException(e);
if (doAbort) {
break;
}
}
}
return errors;
}
}
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