本文整理汇总了C++中intrusive_ptr::stitch方法的典型用法代码示例。如果您正苦于以下问题：C++ intrusive_ptr::stitch方法的具体用法？C++ intrusive_ptr::stitch怎么用？C++ intrusive_ptr::stitch使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类intrusive_ptr的用法示例。
在下文中一共展示了intrusive_ptr::stitch方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: executeSplitPipeline
/*
Execute the pipeline for the explain. This is common to both the
locked and unlocked code path. However, the results are different.
For an explain, with no lock, it really outputs the pipeline
chain rather than fetching the data.
*/
bool executeSplitPipeline(BSONObjBuilder& result, string& errmsg,
const string& ns, const string& db,
intrusive_ptr<Pipeline>& pPipeline,
intrusive_ptr<ExpressionContext>& pCtx) {
/* setup as if we're in the router */
pCtx->inRouter = true;
/*
Here, we'll split the pipeline in the same way we would for sharding,
for testing purposes.
Run the shard pipeline first, then feed the results into the remains
of the existing pipeline.
Start by splitting the pipeline.
*/
intrusive_ptr<Pipeline> pShardSplit = pPipeline->splitForSharded();
// Write the split pipeline as we would in order to transmit it to the shard servers.
Document shardCmd = pShardSplit->serialize();
DEV log() << "\n---- shardDescription\n" << shardCmd.toString() << "\n----\n";
// for debugging purposes, show what the pipeline now looks like
DEV log() << "\n---- pipelineDescription\n" << pPipeline->serialize() << "\n----\n";
/* on the shard servers, create the local pipeline */
intrusive_ptr<ExpressionContext> pShardCtx =
new ExpressionContext(InterruptStatusMongod::status, NamespaceString(ns));
BSONObj shardObj = shardCmd.toBson();
intrusive_ptr<Pipeline> pShardPipeline(
Pipeline::parseCommand(errmsg, shardObj, pShardCtx));
if (!pShardPipeline.get()) {
return false;
}
PipelineD::prepareCursorSource(pShardPipeline, nsToDatabase(ns), pCtx);
/* run the shard pipeline */
BSONObjBuilder shardResultBuilder;
string shardErrmsg;
pShardPipeline->stitch();
pShardPipeline->run(shardResultBuilder);
BSONObj shardResult(shardResultBuilder.done());
/* pick out the shard result, and prepare to read it */
intrusive_ptr<DocumentSourceBsonArray> pShardSource;
BSONObjIterator shardIter(shardResult);
while(shardIter.more()) {
BSONElement shardElement(shardIter.next());
const char *pFieldName = shardElement.fieldName();
if ((strcmp(pFieldName, "result") == 0) ||
(strcmp(pFieldName, "serverPipeline") == 0)) {
pPipeline->addInitialSource(DocumentSourceBsonArray::create(&shardElement, pCtx));
pPipeline->stitch();
/*
Connect the output of the shard pipeline with the mongos
pipeline that will merge the results.
*/
pPipeline->run(result);
return true;
}
}
/* NOTREACHED */
verify(false);
return false;
}