SERVER-30015 Create the interface for ChunkSplitter

1 files changed, 74 insertions, 0 deletions

diff --git a/src/mongo/db/s/chunk_splitter.cpp b/src/mongo/db/s/chunk_splitter.cpp
new file mode 100644
index 00000000000..1f0575ce278
--- /dev/null
+++ b/src/mongo/db/s/chunk_splitter.cpp
@@ -0,0 +1,74 @@
+/**
+ *    Copyright (C) 2017 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/s/chunk_splitter.h"
+
+#include "mongo/db/client.h"
+#include "mongo/db/namespace_string.h"
+#include "mongo/db/operation_context.h"
+#include "mongo/s/catalog/type_chunk.h"
+
+namespace mongo {
+namespace {
+
+/**
+ * Constructs the default options for the thread pool used by the cache loader.
+ */
+ThreadPool::Options makeDefaultThreadPoolOptions() {
+    ThreadPool::Options options;
+    options.poolName = "ChunkSplitter";
+    options.minThreads = 0;
+    options.maxThreads = 1;
+
+    // Ensure all threads have a client
+    options.onCreateThread = [](const std::string& threadName) {
+        Client::initThread(threadName.c_str());
+    };
+    return options;
+}
+
+}  // namespace
+
+ChunkSplitter::ChunkSplitter() : _threadPool(makeDefaultThreadPoolOptions()) {
+    _threadPool.startup();
+}
+
+ChunkSplitter::~ChunkSplitter() {
+    _threadPool.shutdown();
+    _threadPool.join();
+}
+
+bool ChunkSplitter::trySplitting(OperationContext* opCtx,
+                                 const NamespaceString& nss,
+                                 const ChunkRange& chunkRange) {
+    return false;
+}
+
+}  // namespace mongo