1 files changed, 138 insertions, 0 deletions
diff --git a/src/mongo/s/catalog/replset/replset_dist_lock_manager.cpp b/src/mongo/s/catalog/replset/replset_dist_lock_manager.cpp
new file mode 100644
index 00000000000..80ae92d7fe9
--- /dev/null
+++ b/src/mongo/s/catalog/replset/replset_dist_lock_manager.cpp
@@ -0,0 +1,138 @@
+/**
+ *    Copyright (C) 2015 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.
+ */
+
+#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/s/catalog/replset/replset_dist_lock_manager.h"
+
+#include "mongo/base/status.h"
+#include "mongo/base/status_with.h"
+#include "mongo/s/catalog/dist_lock_catalog.h"
+#include "mongo/s/type_locks.h"
+#include "mongo/util/concurrency/thread_name.h"
+#include "mongo/util/log.h"
+#include "mongo/util/mongoutils/str.h"
+#include "mongo/util/timer.h"
+
+namespace mongo {
+
+    using std::string;
+    using std::unique_ptr;
+    using stdx::chrono::milliseconds;
+
+    ReplSetDistLockManager::ReplSetDistLockManager(StringData processID,
+                                                   unique_ptr<DistLockCatalog> catalog):
+        _processID(processID.toString()),
+        _catalog(std::move(catalog)) {
+    }
+
+    ReplSetDistLockManager::~ReplSetDistLockManager() = default;
+
+    void ReplSetDistLockManager::startUp() {
+        // TODO
+    }
+
+    void ReplSetDistLockManager::shutDown() {
+        // TODO
+    }
+
+    StatusWith<DistLockManager::ScopedDistLock> ReplSetDistLockManager::lock(
+            StringData name,
+            StringData whyMessage,
+            milliseconds waitFor,
+            milliseconds lockTryInterval) {
+        Timer timer;
+        Timer msgTimer;
+
+        while (waitFor <= milliseconds::zero() || milliseconds(timer.millis()) < waitFor) {
+            OID lockSessionID = OID::gen();
+            string who = str::stream() << _processID << ":" << getThreadName();
+            auto lockResult = _catalog->grabLock(name,
+                                                 lockSessionID,
+                                                 who,
+                                                 _processID,
+                                                 Date_t::now(),
+                                                 whyMessage);
+
+            auto status = lockResult.getStatus();
+
+            if (!status.isOK()) {
+                // An error occurred but the write might have actually been applied on the
+                // other side. Schedule an unlock to clean it up just in case.
+                queueUnlock(lockSessionID);
+                return status;
+            }
+
+            const auto& lockDoc = lockResult.getValue();
+            if (lockDoc.isValid(nullptr)) {
+                // Lock is acquired since findAndModify was able to successfully modify
+                // the lock document.
+                return ScopedDistLock(lockSessionID, this);
+            }
+
+            // TODO: implement lock overtaking here.
+
+            if (waitFor == milliseconds::zero()) {
+                break;
+            }
+
+            // Periodically message for debugging reasons
+            if (msgTimer.seconds() > 10) {
+                LOG(0) << "waited " << timer.seconds() << "s for distributed lock " << name
+                       << " for " << whyMessage;
+
+                msgTimer.reset();
+            }
+
+            milliseconds timeRemaining =
+                    std::max(milliseconds::zero(), waitFor - milliseconds(timer.millis()));
+            sleepFor(std::min(lockTryInterval, timeRemaining));
+        }
+
+        return {ErrorCodes::LockBusy, str::stream() << "timed out waiting for " << name};
+    }
+
+    void ReplSetDistLockManager::unlock(const DistLockHandle& lockSessionID) {
+        auto unlockStatus = _catalog->unlock(lockSessionID);
+
+        if (!unlockStatus.isOK()) {
+            queueUnlock(lockSessionID);
+        }
+    }
+
+    Status ReplSetDistLockManager::checkStatus(const DistLockHandle& lockHandle) {
+        invariant(false);
+    }
+
+    void ReplSetDistLockManager::queueUnlock(const OID& lockSessionID) {
+        // TODO: implement
+        invariant(false);
+    }
+}