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Diffstat (limited to 'src/mongo/db/query/runner.h')
| -rw-r--r-- | src/mongo/db/query/runner.h | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/src/mongo/db/query/runner.h b/src/mongo/db/query/runner.h index 148a956f861..43ad7500ac8 100644 --- a/src/mongo/db/query/runner.h +++ b/src/mongo/db/query/runner.h @@ -19,21 +19,31 @@ namespace mongo { /** - * A runner runs a query. All yielding, fetching, and other query details are taken care of by - * the runner. - * - * TODO: Do we want to expand the interface to allow yielding? IE, if update is running a query - * and updating at the same time? + * A runner runs a query. */ class Runner { public: + virtual ~Runner() { } + /** * Get the next result from the query. */ - // TODO: This is inefficient and should probably append to some message buffer or similar. virtual bool getNext(BSONObj* objOut) = 0; - virtual ~Runner() { } + /** + * Inform the runner that the provided DiskLoc is about to disappear (or change entirely). + * The runner then takes any actions required to continue operating correctly, including + * broadcasting the invalidation request to the PlanStage tree being run. + * + * Called from ClientCursor::aboutToDelete. + */ + virtual void invalidate(const DiskLoc& dl) = 0; + + /** + * TODO: Kill these once yielding is controlled inside of a runner. + */ + virtual void yield() = 0; + virtual void unYield() = 0; }; } // namespace mongo |