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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.documentapi.messagebus;
import com.yahoo.document.Document;
import com.yahoo.document.DocumentId;
import com.yahoo.document.DocumentPut;
import com.yahoo.document.DocumentRemove;
import com.yahoo.document.DocumentUpdate;
import com.yahoo.document.fieldset.DocumentOnly;
import com.yahoo.documentapi.AsyncParameters;
import com.yahoo.documentapi.DocumentAccessException;
import com.yahoo.documentapi.DocumentOperationParameters;
import com.yahoo.documentapi.Response;
import com.yahoo.documentapi.Result;
import com.yahoo.documentapi.SyncParameters;
import com.yahoo.documentapi.SyncSession;
import com.yahoo.documentapi.messagebus.protocol.DocumentProtocol;
import com.yahoo.documentapi.messagebus.protocol.GetDocumentMessage;
import com.yahoo.documentapi.messagebus.protocol.GetDocumentReply;
import com.yahoo.documentapi.messagebus.protocol.PutDocumentMessage;
import com.yahoo.documentapi.messagebus.protocol.RemoveDocumentMessage;
import com.yahoo.documentapi.messagebus.protocol.RemoveDocumentReply;
import com.yahoo.documentapi.messagebus.protocol.UpdateDocumentMessage;
import com.yahoo.documentapi.messagebus.protocol.UpdateDocumentReply;
import com.yahoo.messagebus.Message;
import com.yahoo.messagebus.MessageBus;
import com.yahoo.messagebus.Reply;
import com.yahoo.messagebus.ReplyHandler;
import java.time.Duration;
import java.time.Instant;
import static com.yahoo.documentapi.DocumentOperationParameters.parameters;
/**
* An implementation of the SyncSession interface running over message bus.
*
* @author Simon Thoresen Hult
* @author bjorncs
*/
public class MessageBusSyncSession implements MessageBusSession, SyncSession, ReplyHandler {
private final MessageBusAsyncSession session;
private final Duration defaultTimeout;
/**
* Creates a new sync session running on message bus logic.
*
* @param syncParams Common syncsession parameters, not used.
* @param bus The message bus on which to run.
* @param mbusParams Parameters concerning message bus configuration.
*/
MessageBusSyncSession(SyncParameters syncParams, MessageBus bus, MessageBusParams mbusParams) {
session = new MessageBusAsyncSession(new AsyncParameters(), bus, mbusParams, this);
defaultTimeout = syncParams.defaultTimeout().orElse(null);
}
@Override
public void handleReply(Reply reply) {
if (reply.getContext() instanceof RequestMonitor) {
((RequestMonitor)reply.getContext()).replied(reply);
} else {
ReplyHandler handler = reply.getCallStack().pop(reply);
handler.handleReply(reply); // not there yet
}
}
@Override
public Response getNext() {
throw new UnsupportedOperationException("Queue not supported.");
}
@Override
public Response getNext(int timeout) {
throw new UnsupportedOperationException("Queue not supported.");
}
@Override
public void destroy() {
session.destroy();
}
/**
* Perform a synchronous sending of a message. This method block until the message is successfuly sent and a
* corresponding reply has been received.
*
* @param msg The message to send.
* @return The reply received.
*/
public Reply syncSend(Message msg) {
return syncSend(msg, parameters());
}
private Reply syncSend(Message msg, DocumentOperationParameters parameters) {
return syncSend(msg, defaultTimeout, parameters);
}
private Reply syncSend(Message msg, Duration timeout, DocumentOperationParameters parameters) {
if (timeout != null) {
parameters = parameters.withDeadline(Instant.now().plus(timeout));
}
try {
RequestMonitor monitor = new RequestMonitor();
msg.setContext(monitor);
msg.pushHandler(this); // store monitor
Result result = null;
while (result == null || result.type() == Result.ResultType.TRANSIENT_ERROR) {
result = session.send(msg, parameters);
if (result != null && result.isSuccess()) {
break;
}
Thread.sleep(100);
}
if (!result.isSuccess()) {
throw new DocumentAccessException(result.error().toString());
}
return monitor.waitForReply();
} catch (InterruptedException e) {
throw new DocumentAccessException(e);
}
}
@Override
public void put(DocumentPut documentPut) {
put(documentPut, parameters());
}
@Override
public void put(DocumentPut documentPut, DocumentOperationParameters parameters) {
PutDocumentMessage msg = new PutDocumentMessage(documentPut);
Reply reply = syncSend(msg, parameters);
if (reply.hasErrors()) {
throw new DocumentAccessException(MessageBusAsyncSession.getErrorMessage(reply), reply.getErrorCodes());
}
}
@Override
public Document get(DocumentId id, Duration timeout) {
return get(id, parameters(), timeout);
}
@Override
public Document get(DocumentId id, DocumentOperationParameters parameters, Duration timeout) {
GetDocumentMessage msg = new GetDocumentMessage(id, parameters.fieldSet().orElse(DocumentOnly.NAME));
Reply reply = syncSend(msg, timeout != null ? timeout : defaultTimeout, parameters);
if (reply.hasErrors()) {
throw new DocumentAccessException(MessageBusAsyncSession.getErrorMessage(reply));
}
if (reply.getType() != DocumentProtocol.REPLY_GETDOCUMENT) {
throw new DocumentAccessException("Received unknown response: " + reply);
}
GetDocumentReply docReply = ((GetDocumentReply)reply);
Document doc = docReply.getDocument();
if (doc != null) {
doc.setLastModified(docReply.getLastModified());
}
return doc;
}
@Override
public boolean remove(DocumentRemove documentRemove) {
return remove(documentRemove, parameters());
}
@Override
public boolean remove(DocumentRemove documentRemove, DocumentOperationParameters parameters) {
RemoveDocumentMessage msg = new RemoveDocumentMessage(documentRemove.getId());
msg.setCondition(documentRemove.getCondition());
Reply reply = syncSend(msg, parameters);
if (reply.hasErrors()) {
throw new DocumentAccessException(MessageBusAsyncSession.getErrorMessage(reply));
}
if (reply.getType() != DocumentProtocol.REPLY_REMOVEDOCUMENT) {
throw new DocumentAccessException("Received unknown response: " + reply);
}
return ((RemoveDocumentReply)reply).wasFound();
}
@Override
public boolean update(DocumentUpdate update) {
return update(update, parameters());
}
@Override
public boolean update(DocumentUpdate update, DocumentOperationParameters parameters) {
UpdateDocumentMessage msg = new UpdateDocumentMessage(update);
Reply reply = syncSend(msg, parameters);
if (reply.hasErrors()) {
throw new DocumentAccessException(MessageBusAsyncSession.getErrorMessage(reply), reply.getErrorCodes());
}
if (reply.getType() != DocumentProtocol.REPLY_UPDATEDOCUMENT) {
throw new DocumentAccessException("Received unknown response: " + reply);
}
return ((UpdateDocumentReply)reply).wasFound();
}
@Override
public String getRoute() {
return session.getRoute();
}
@Override
public void setRoute(String route) {
session.setRoute(route);
}
@Override
public int getTraceLevel() {
return session.getTraceLevel();
}
@Override
public void setTraceLevel(int traceLevel) {
session.setTraceLevel(traceLevel);
}
/**
* This class implements a monitor for waiting for a reply to arrive.
*/
static class RequestMonitor {
private Reply reply = null;
synchronized Reply waitForReply() throws InterruptedException {
while (reply == null) {
wait();
}
return reply;
}
synchronized void replied(Reply reply) {
this.reply = reply;
notify();
}
}
}
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