C++ BatchItemRef::getDelete方法代码示例

    /**
     * Perform a remove operation, which might remove multiple documents.  Dispatches to remove code
     * currently to do most of this.
     *
     * Might fault or error, otherwise populates the result.
     */
    static void multiRemove( OperationContext* txn,
                             const BatchItemRef& removeItem,
                             WriteOpResult* result ) {

        const NamespaceString nss( removeItem.getRequest()->getNS() );
        DeleteRequest request( nss );
        request.setQuery( removeItem.getDelete()->getQuery() );
        request.setMulti( removeItem.getDelete()->getLimit() != 1 );
        request.setUpdateOpLog(true);
        request.setGod( false );
        DeleteExecutor executor( &request );
        Status status = executor.prepare();
        if ( !status.isOK() ) {
            result->setError(toWriteError(status));
            return;
        }

        ///////////////////////////////////////////
        Lock::DBWrite writeLock(txn->lockState(), nss.ns());
        ///////////////////////////////////////////

        // Check version once we're locked

        if (!checkShardVersion(txn, &shardingState, *removeItem.getRequest(), result)) {
            // Version error
            return;
        }

        // Context once we're locked, to set more details in currentOp()
        // TODO: better constructor?
        Client::Context writeContext( nss.ns(),
                                      storageGlobalParams.dbpath,
                                      false /* don't check version */);

        try {
            result->getStats().n = executor.execute(txn, writeContext.db());
        }
        catch ( const DBException& ex ) {
            status = ex.toStatus();
            if (ErrorCodes::isInterruption(status.code())) {
                throw;
            }
            result->setError(toWriteError(status));
        }
    }

    /**
     * Perform a remove operation, which might remove multiple documents.  Dispatches to remove code
     * currently to do most of this.
     *
     * Might fault or error, otherwise populates the result.
     */
    static void multiRemove( const BatchItemRef& removeItem,
                             WriteOpResult* result ) {

        Lock::assertWriteLocked( removeItem.getRequest()->getNS() );

        try {
            long long n = deleteObjects( removeItem.getRequest()->getNS(),
                                         removeItem.getDelete()->getQuery(),
                                         removeItem.getDelete()->getLimit() == 1, // justOne
                                         true, // logOp
                                         false // god
                                         );

            result->stats.n = n;
        }
        catch ( const PageFaultException& ex ) {
            // TODO: An actual data structure that's not an exception for this
            result->fault = new PageFaultException( ex );
        }
        catch ( const DBException& ex ) {
            result->error = toWriteError( ex.toStatus() );
        }
    }

    Status Strategy::commandOpWrite(const std::string& dbName,
                                    const BSONObj& command,
                                    BatchItemRef targetingBatchItem,
                                    std::vector<CommandResult>* results) {

        // Note that this implementation will not handle targeting retries and does not completely
        // emulate write behavior

        ChunkManagerTargeter targeter(NamespaceString(
                                        targetingBatchItem.getRequest()->getTargetingNS()));
        Status status = targeter.init();
        if (!status.isOK())
            return status;

        OwnedPointerVector<ShardEndpoint> endpointsOwned;
        vector<ShardEndpoint*>& endpoints = endpointsOwned.mutableVector();

        if (targetingBatchItem.getOpType() == BatchedCommandRequest::BatchType_Insert) {
            ShardEndpoint* endpoint;
            Status status = targeter.targetInsert(targetingBatchItem.getDocument(), &endpoint);
            if (!status.isOK())
                return status;
            endpoints.push_back(endpoint);
        }
        else if (targetingBatchItem.getOpType() == BatchedCommandRequest::BatchType_Update) {
            Status status = targeter.targetUpdate(*targetingBatchItem.getUpdate(), &endpoints);
            if (!status.isOK())
                return status;
        }
        else {
            invariant(targetingBatchItem.getOpType() == BatchedCommandRequest::BatchType_Delete);
            Status status = targeter.targetDelete(*targetingBatchItem.getDelete(), &endpoints);
            if (!status.isOK())
                return status;
        }

        DBClientShardResolver resolver;
        DBClientMultiCommand dispatcher;

        // Assemble requests
        for (vector<ShardEndpoint*>::const_iterator it = endpoints.begin(); it != endpoints.end();
            ++it) {

            const ShardEndpoint* endpoint = *it;

            ConnectionString host;
            Status status = resolver.chooseWriteHost(endpoint->shardName, &host);
            if (!status.isOK())
                return status;

            RawBSONSerializable request(command);
            dispatcher.addCommand(host, dbName, request);
        }

        // Errors reported when recv'ing responses
        dispatcher.sendAll();
        Status dispatchStatus = Status::OK();

        // Recv responses
        while (dispatcher.numPending() > 0) {

            ConnectionString host;
            RawBSONSerializable response;

            Status status = dispatcher.recvAny(&host, &response);
            if (!status.isOK()) {
                // We always need to recv() all the sent operations
                dispatchStatus = status;
                continue;
            }

            CommandResult result;
            result.target = host;
            result.shardTarget = Shard::make(host.toString());
            result.result = response.toBSON();

            results->push_back(result);
        }

        return dispatchStatus;
    }