C++ intrusive_ptr::toBson方法代码示例

bool DocumentSourceMatch::accept(
    const intrusive_ptr<Document> &pDocument) const {

    /*
      The matcher only takes BSON documents, so we have to make one.

      LATER
      We could optimize this by making a document with only the
      fields referenced by the Matcher.  We could do this by looking inside
      the Matcher's BSON before it is created, and recording those.  The
      easiest implementation might be to hold onto an ExpressionDocument
      in here, and give that pDocument to create the created subset of
      fields, and then convert that instead.
    */
    BSONObjBuilder objBuilder;
    pDocument->toBson(&objBuilder);
    BSONObj obj(objBuilder.done());

    return matcher.matches(obj);
}

    bool PipelineCommand::executePipeline(
        BSONObjBuilder &result, string &errmsg, const string &ns,
        intrusive_ptr<Pipeline> &pPipeline,
        intrusive_ptr<DocumentSourceCursor> &pSource,
        intrusive_ptr<ExpressionContext> &pCtx) {

        /* this is the normal non-debug path */
        if (!pPipeline->getSplitMongodPipeline())
            return pPipeline->run(result, errmsg, pSource);

        /* setup as if we're in the router */
        pCtx->setInRouter(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.
        */
        BSONObjBuilder shardBuilder;
        pShardSplit->toBson(&shardBuilder);
        BSONObj shardBson(shardBuilder.done());

        DEV (log() << "\n---- shardBson\n" <<
             shardBson.jsonString(Strict, 1) << "\n----\n").flush();

        /* for debugging purposes, show what the pipeline now looks like */
        DEV {
            BSONObjBuilder pipelineBuilder;
            pPipeline->toBson(&pipelineBuilder);
            BSONObj pipelineBson(pipelineBuilder.done());
            (log() << "\n---- pipelineBson\n" <<
             pipelineBson.jsonString(Strict, 1) << "\n----\n").flush();
        }

        /* on the shard servers, create the local pipeline */
        intrusive_ptr<ExpressionContext> pShardCtx(
            ExpressionContext::create(&InterruptStatusMongod::status));
        intrusive_ptr<Pipeline> pShardPipeline(
            Pipeline::parseCommand(errmsg, shardBson, pShardCtx));
        if (!pShardPipeline.get()) {
            return false;
        }

        /* run the shard pipeline */
        BSONObjBuilder shardResultBuilder;
        string shardErrmsg;
        pShardPipeline->run(shardResultBuilder, shardErrmsg, pSource);
        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)) {
                pShardSource = DocumentSourceBsonArray::create(
                    &shardElement, pCtx);

                /*
                  Connect the output of the shard pipeline with the mongos
                  pipeline that will merge the results.
                */
                return pPipeline->run(result, errmsg, pShardSource);
            }
        }

        /* NOTREACHED */
        verify(false);
        return false;
    }