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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.docproc.jdisc.messagebus;
import com.yahoo.documentapi.messagebus.protocol.DocumentProtocol;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.handler.ContentChannel;
import com.yahoo.jdisc.handler.ResponseDispatch;
import com.yahoo.jdisc.handler.ResponseHandler;
import com.yahoo.messagebus.Message;
import com.yahoo.messagebus.Reply;
import com.yahoo.messagebus.TraceNode;
import com.yahoo.messagebus.jdisc.MbusResponse;
import com.yahoo.messagebus.jdisc.StatusCodes;
import java.util.ArrayList;
import java.util.List;
/**
* @author Einar M R Rosenvinge
*/
class ResponseMerger implements ResponseHandler {
private final Message requestMsg;
private final TraceNode requestTrace = new TraceNode().setStrict(false);
private final ResponseHandler responseHandler;
private final List<Reply> replies;
private int numPending;
public ResponseMerger(Message requestMsg, int numPending, ResponseHandler responseHandler) {
this.requestMsg = requestMsg;
this.responseHandler = responseHandler;
this.replies = new ArrayList<>(numPending);
this.numPending = numPending;
}
@Override
public ContentChannel handleResponse(Response response) {
synchronized (this) {
if (response instanceof MbusResponse) {
Reply reply = ((MbusResponse)response).getReply();
requestTrace.addChild(reply.getTrace().getRoot());
replies.add(reply);
}
if (--numPending != 0) {
return null;
}
}
requestMsg.getTrace().getRoot().addChild(requestTrace);
Reply reply = DocumentProtocol.merge(replies);
Response mbusResponse = new MbusResponse(StatusCodes.fromMbusReply(reply), reply);
ResponseDispatch.newInstance(mbusResponse).dispatch(responseHandler);
return null;
}
}
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