SERVER-14634 move MultiIteratorStage and PipelineProxyStage into exec/ directory

1 files changed, 121 insertions, 0 deletions

diff --git a/src/mongo/db/exec/pipeline_proxy.cpp b/src/mongo/db/exec/pipeline_proxy.cpp
new file mode 100644
index 00000000000..071a200a94d
--- /dev/null
+++ b/src/mongo/db/exec/pipeline_proxy.cpp
@@ -0,0 +1,121 @@
+/**
+ *    Copyright (C) 2014 MongoDB 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/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/exec/pipeline_proxy.h"
+
+#include "mongo/db/pipeline/document_source.h"
+#include "mongo/db/pipeline/expression_context.h"
+
+namespace mongo {
+
+    PipelineProxyStage::PipelineProxyStage(intrusive_ptr<Pipeline> pipeline,
+                                           const boost::shared_ptr<PlanExecutor>& child,
+                                           WorkingSet* ws)
+        : _pipeline(pipeline)
+        , _includeMetaData(_pipeline->getContext()->inShard) // send metadata to merger
+        , _childExec(child)
+        , _ws(ws)
+    {}
+
+    PlanStage::StageState PipelineProxyStage::work(WorkingSetID* out) {
+        if (!out) {
+            return PlanStage::FAILURE;
+        }
+
+        if (!_stash.empty()) {
+            *out = _ws->allocate();
+            WorkingSetMember* member = _ws->get(*out);
+            member->obj = _stash.back();
+            _stash.pop_back();
+            member->state = WorkingSetMember::OWNED_OBJ;
+            return PlanStage::ADVANCED;
+        }
+
+        if (boost::optional<BSONObj> next = getNextBson()) {
+            *out = _ws->allocate();
+            WorkingSetMember* member = _ws->get(*out);
+            member->obj = *next;
+            member->state = WorkingSetMember::OWNED_OBJ;
+            return PlanStage::ADVANCED;
+        }
+
+        return PlanStage::IS_EOF;
+    }
+
+    bool PipelineProxyStage::isEOF() {
+        if (!_stash.empty())
+            return false;
+
+        if (boost::optional<BSONObj> next = getNextBson()) {
+            _stash.push_back(*next);
+            return false;
+        }
+
+        return true;
+    }
+
+    void PipelineProxyStage::invalidate(const DiskLoc& dl, InvalidationType type) {
+        // propagate to child executor if still in use
+        if (boost::shared_ptr<PlanExecutor> exec = _childExec.lock()) {
+            exec->invalidate(dl, type);
+        }
+    }
+
+    void PipelineProxyStage::saveState() {
+        _pipeline->getContext()->opCtx = NULL;
+    }
+
+    void PipelineProxyStage::restoreState(OperationContext* opCtx) {
+        _pipeline->getContext()->opCtx = opCtx;
+    }
+
+    void PipelineProxyStage::pushBack(const BSONObj& obj) {
+        _stash.push_back(obj);
+    }
+
+    vector<PlanStage*> PipelineProxyStage::getChildren() const {
+        vector<PlanStage*> empty;
+        return empty;
+    }
+
+    boost::optional<BSONObj> PipelineProxyStage::getNextBson() {
+        if (boost::optional<Document> next = _pipeline->output()->getNext()) {
+            if (_includeMetaData) {
+                return next->toBsonWithMetaData();
+            }
+            else {
+                return next->toBson();
+            }
+        }
+
+        return boost::none;
+    }
+
+} // namespace mongo