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diff --git a/src/mongo/db/service_liaison_mock.cpp b/src/mongo/db/service_liaison_mock.cpp
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+++ b/src/mongo/db/service_liaison_mock.cpp
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+/**
+ *    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 <algorithm>
+
+#include "mongo/db/service_liaison_mock.h"
+#include "mongo/stdx/memory.h"
+#include "mongo/util/periodic_runner_factory.h"
+
+namespace mongo {
+
+MockServiceLiaisonImpl::MockServiceLiaisonImpl() {
+    _timerFactory = stdx::make_unique<executor::AsyncTimerFactoryMock>();
+    _runner = makePeriodicRunner(getGlobalServiceContext());
+    _runner->startup();
+}
+
+LogicalSessionIdSet MockServiceLiaisonImpl::getActiveOpSessions() const {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    return _activeSessions;
+}
+
+LogicalSessionIdSet MockServiceLiaisonImpl::getOpenCursorSessions() const {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    return _cursorSessions;
+}
+
+void MockServiceLiaisonImpl::join() {
+    _runner->shutdown();
+}
+
+Date_t MockServiceLiaisonImpl::now() const {
+    return _timerFactory->now();
+}
+
+void MockServiceLiaisonImpl::scheduleJob(PeriodicRunner::PeriodicJob job) {
+    // The cache should be refreshed from tests by calling refreshNow().
+    return;
+}
+
+
+void MockServiceLiaisonImpl::addCursorSession(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _cursorSessions.insert(std::move(lsid));
+}
+
+void MockServiceLiaisonImpl::removeCursorSession(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _cursorSessions.erase(lsid);
+}
+
+void MockServiceLiaisonImpl::clearCursorSession() {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _cursorSessions.clear();
+}
+
+void MockServiceLiaisonImpl::add(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _cursorSessions.insert(std::move(lsid));
+}
+
+void MockServiceLiaisonImpl::remove(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _activeSessions.erase(lsid);
+}
+
+void MockServiceLiaisonImpl::clear() {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _activeSessions.clear();
+}
+
+void MockServiceLiaisonImpl::fastForward(Milliseconds time) {
+    _timerFactory->fastForward(time);
+}
+
+int MockServiceLiaisonImpl::jobs() {
+    return _timerFactory->jobs();
+}
+
+const KillAllSessionsByPattern* MockServiceLiaisonImpl::matchKilled(const LogicalSessionId& lsid) {
+    return _matcher->match(lsid);
+}
+
+std::pair<Status, int> MockServiceLiaisonImpl::killCursorsWithMatchingSessions(
+    OperationContext* opCtx, const SessionKiller::Matcher& matcher) {
+
+    _matcher = matcher;
+    return std::make_pair(Status::OK(), 0);
+}
+
+}  // namespace mongo