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package com.yahoo.documentapi.local;
import com.yahoo.document.Document;
import com.yahoo.document.DocumentId;
import com.yahoo.document.DocumentPut;
import com.yahoo.document.fieldset.FieldSet;
import com.yahoo.document.fieldset.FieldSetRepo;
import com.yahoo.document.select.DocumentSelector;
import com.yahoo.document.select.Result;
import com.yahoo.document.select.parser.ParseException;
import com.yahoo.documentapi.AckToken;
import com.yahoo.documentapi.ProgressToken;
import com.yahoo.documentapi.VisitorControlHandler;
import com.yahoo.documentapi.VisitorDataHandler;
import com.yahoo.documentapi.VisitorDataQueue;
import com.yahoo.documentapi.VisitorParameters;
import com.yahoo.documentapi.VisitorResponse;
import com.yahoo.documentapi.VisitorSession;
import com.yahoo.documentapi.messagebus.protocol.PutDocumentMessage;
import com.yahoo.messagebus.Trace;
import com.yahoo.yolean.Exceptions;
import java.util.Comparator;
import java.util.Map;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.Phaser;
import java.util.concurrent.atomic.AtomicReference;
/**
* Local visitor session that copies and iterates through all items in the local document access.
* Each document must be ack'ed for the session to be done visiting.
* Only document puts are sent by this session, and this is done from a separate thread.
*
* @author jonmv
*/
public class LocalVisitorSession implements VisitorSession {
private enum State { RUNNING, FAILURE, ABORTED, SUCCESS }
private final VisitorDataHandler data;
private final VisitorControlHandler control;
private final Map<DocumentId, Document> outstanding;
private final DocumentSelector selector;
private final FieldSet fieldSet;
private final AtomicReference<State> state;
private final AtomicReference<Phaser> phaser;
public LocalVisitorSession(LocalDocumentAccess access, VisitorParameters parameters) throws ParseException {
if (parameters.getResumeToken() != null)
throw new UnsupportedOperationException("Continuation via progress tokens is not supported");
if (parameters.getRemoteDataHandler() != null)
throw new UnsupportedOperationException("Remote data handlers are not supported");
this.selector = new DocumentSelector(parameters.getDocumentSelection());
this.fieldSet = new FieldSetRepo().parse(access.getDocumentTypeManager(), parameters.fieldSet());
this.data = parameters.getLocalDataHandler() == null ? new VisitorDataQueue() : parameters.getLocalDataHandler();
this.data.reset();
this.data.setSession(this);
this.control = parameters.getControlHandler() == null ? new VisitorControlHandler() : parameters.getControlHandler();
this.control.reset();
this.control.setSession(this);
this.outstanding = new ConcurrentSkipListMap<>(Comparator.comparing(DocumentId::toString));
this.outstanding.putAll(access.documents);
this.state = new AtomicReference<>(State.RUNNING);
this.phaser = access.phaser;
start();
}
void start() {
Phaser synchronizer = phaser.get();
if (synchronizer != null)
synchronizer.register();
new Thread(() -> {
try {
// Iterate through all documents and pass on to data handler
outstanding.forEach((id, document) -> {
if (state.get() != State.RUNNING)
return;
try {
if (selector.accepts(new DocumentPut(document)) != Result.TRUE)
return;
}
catch (RuntimeException e) {
return;
}
Document copy = new Document(document.getDataType(), document.getId());
new FieldSetRepo().copyFields(document, copy, fieldSet);
if (synchronizer != null)
synchronizer.arriveAndAwaitAdvance();
data.onMessage(new PutDocumentMessage(new DocumentPut(copy)),
new AckToken(id));
if (synchronizer != null)
synchronizer.arriveAndAwaitAdvance();
});
// Transition to a terminal state when done
state.updateAndGet(current -> {
switch (current) {
case RUNNING:
control.onDone(VisitorControlHandler.CompletionCode.SUCCESS, "Success");
return State.SUCCESS;
case ABORTED:
control.onDone(VisitorControlHandler.CompletionCode.ABORTED, "Aborted by user");
return State.ABORTED;
default:
control.onDone(VisitorControlHandler.CompletionCode.FAILURE, "Unexpected state '" + current + "'");;
return State.FAILURE;
}
});
}
// Transition to failure terminal state on error
catch (Exception e) {
state.set(State.FAILURE);
outstanding.clear();
control.onDone(VisitorControlHandler.CompletionCode.FAILURE, Exceptions.toMessageString(e));
}
finally {
if (synchronizer != null)
synchronizer.arriveAndDeregister();
data.onDone();
}
}).start();
}
@Override
public boolean isDone() {
return outstanding.isEmpty() // All documents ack'ed
&& control.isDone(); // Control handler has been notified
}
@Override
public ProgressToken getProgress() {
throw new UnsupportedOperationException("Progress tokens are not supported");
}
@Override
public Trace getTrace() {
throw new UnsupportedOperationException("Traces are not supported");
}
@Override
public boolean waitUntilDone(long timeoutMs) throws InterruptedException {
return control.waitUntilDone(timeoutMs);
}
@Override
public void ack(AckToken token) {
outstanding.remove((DocumentId) token.ackObject);
}
@Override
public void abort() {
state.updateAndGet(current -> current == State.RUNNING ? State.ABORTED : current);
outstanding.clear();
}
@Override
public VisitorResponse getNext() {
return data.getNext();
}
@Override
public VisitorResponse getNext(int timeoutMilliseconds) throws InterruptedException {
return data.getNext(timeoutMilliseconds);
}
@Override
public void destroy() {
abort();
}
}
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