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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.storage.searcher;
import com.yahoo.document.Document;
import com.yahoo.document.DocumentId;
import com.yahoo.document.DocumentType;
import com.yahoo.documentapi.VisitorParameters;
import com.yahoo.documentapi.VisitorSession;
import com.yahoo.documentapi.messagebus.protocol.GetDocumentMessage;
import com.yahoo.documentapi.messagebus.protocol.GetDocumentReply;
import com.yahoo.feedapi.DummySessionFactory;
import com.yahoo.feedapi.SendSession;
import com.yahoo.jdisc.Metric;
import com.yahoo.messagebus.*;
import com.yahoo.messagebus.Error;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
/**
* Used to automatically reply with a GetDocumentReply for every received GetDocumentMessage
*/
public class DocumentSessionFactory extends DummySessionFactory {
private DocumentType docType;
private Error error;
// Reply instances are shared between the two collections.
List<GetDocumentReply> autoReplies;
Map<DocumentId, GetDocumentReply> autoReplyLookup = new HashMap<>();
boolean autoReply = true;
boolean nullReply = false;
private int sessionsCreated = 0;
private class DocumentReplySession extends SendSession {
ReplyHandler handler;
Error e;
DummySessionFactory owner;
public DocumentReplySession(ReplyHandler handler, Error e, DummySessionFactory owner) {
this.handler = handler;
this.e = e;
this.owner = owner;
}
protected Result onSend(Message m, boolean blockIfQueueFull) throws InterruptedException {
if (!(m instanceof GetDocumentMessage)) {
throw new IllegalArgumentException("Expected GetDocumentMessage");
}
GetDocumentMessage gm = (GetDocumentMessage)m;
owner.messages.add(m);
if (autoReply) {
Document replyDoc;
if (!nullReply) {
replyDoc = new Document(docType, gm.getDocumentId());
} else {
replyDoc = null;
}
Reply r = new GetDocumentReply(replyDoc);
r.setMessage(m);
r.setContext(m.getContext());
if (e != null) {
r.addError(e);
}
handler.handleReply(r);
} else if (owner.messages.size() == autoReplies.size()) {
// Pair up all replies with their messages
for (Message msg : owner.messages) {
GetDocumentReply reply = autoReplyLookup.get(((GetDocumentMessage)msg).getDocumentId());
reply.setMessage(msg);
reply.setContext(msg.getContext());
if (e != null) {
reply.addError(e);
}
}
// Now send them in the correct order. Instances are shared, so source
// messages and contexts are properly set
for (Reply reply : autoReplies) {
handler.handleReply(reply);
}
}
return Result.ACCEPTED;
}
public void close() {
}
}
public DocumentSessionFactory(DocumentType docType) {
this.docType = docType;
this.error = null;
}
public DocumentSessionFactory(DocumentType docType, Error error, boolean autoReply, GetDocumentReply... autoReplies) {
this.docType = docType;
this.error = error;
this.autoReplies = Arrays.asList(autoReplies);
for (GetDocumentReply reply : autoReplies) {
this.autoReplyLookup.put(reply.getDocument().getId(), reply);
}
this.autoReply = autoReply;
}
public boolean isNullReply() {
return nullReply;
}
public void setNullReply(boolean nullReply) {
this.nullReply = nullReply;
}
public int getSessionsCreated() {
return sessionsCreated;
}
public SendSession createSendSession(ReplyHandler r, Metric metric) {
++sessionsCreated;
return new DocumentReplySession(r, error, this);
}
@Override
public VisitorSession createVisitorSession(VisitorParameters p) {
return new DummyVisitorSession(p, docType);
}
}
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