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/**
* Copyright 2011 (c) 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include "db/pipeline/document_source.h"
namespace mongo {
DocumentSourceCommandFutures::~DocumentSourceCommandFutures() {
}
bool DocumentSourceCommandFutures::eof() {
/* if we haven't even started yet, do so */
if (!pCurrent.get())
getNextDocument();
return (pCurrent.get() == NULL);
}
bool DocumentSourceCommandFutures::advance() {
if (eof())
return false;
/* advance */
getNextDocument();
return (pCurrent.get() != NULL);
}
intrusive_ptr<Document> DocumentSourceCommandFutures::getCurrent() {
assert(!eof());
return pCurrent;
}
void DocumentSourceCommandFutures::setSource(
const intrusive_ptr<DocumentSource> &pSource) {
/* this doesn't take a source */
assert(false);
}
void DocumentSourceCommandFutures::sourceToBson(
BSONObjBuilder *pBuilder) const {
/* this has no BSON equivalent */
assert(false);
}
DocumentSourceCommandFutures::DocumentSourceCommandFutures(
string &theErrmsg, FuturesList *pList):
newSource(false),
pBsonSource(),
pCurrent(),
iterator(pList->begin()),
listEnd(pList->end()),
errmsg(theErrmsg) {
}
intrusive_ptr<DocumentSourceCommandFutures>
DocumentSourceCommandFutures::create(
string &errmsg, FuturesList *pList) {
intrusive_ptr<DocumentSourceCommandFutures> pSource(
new DocumentSourceCommandFutures(errmsg, pList));
return pSource;
}
void DocumentSourceCommandFutures::getNextDocument() {
while(true) {
if (!pBsonSource.get()) {
/* if there aren't any more futures, we're done */
if (iterator == listEnd) {
pCurrent.reset();
return;
}
/* grab the next command result */
shared_ptr<Future::CommandResult> pResult(*iterator);
++iterator;
/* try to wait for it */
if (!pResult->join()) {
error() << "sharded pipeline failed on shard: " <<
pResult->getServer() << " error: " <<
pResult->result() << endl;
errmsg += "-- mongod pipeline failed: ";
errmsg += pResult->result().toString();
/* move on to the next command future */
continue;
}
/* grab the result array out of the shard server's response */
BSONObj shardResult(pResult->result());
BSONObjIterator objIterator(shardResult);
while(objIterator.more()) {
BSONElement element(objIterator.next());
const char *pFieldName = element.fieldName();
/* find the result array and quit this loop */
if (strcmp(pFieldName, "result") == 0) {
pBsonSource = DocumentSourceBsonArray::create(&element);
newSource = true;
break;
}
}
}
/* if we're done with this shard's results, try the next */
if (pBsonSource->eof() ||
(!newSource && !pBsonSource->advance())) {
pBsonSource.reset();
continue;
}
pCurrent = pBsonSource->getCurrent();
newSource = false;
return;
}
}
}
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