SERVER-13640: split up ServerStatus into a library

1 files changed, 91 insertions, 0 deletions

diff --git a/src/mongo/db/commands/server_status_metric.h b/src/mongo/db/commands/server_status_metric.h
new file mode 100644
index 00000000000..1f430d3a2c7
--- /dev/null
+++ b/src/mongo/db/commands/server_status_metric.h
@@ -0,0 +1,91 @@
+// server_status_metric.h
+
+/**
+*    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.
+*/
+
+#pragma once
+
+#include <string>
+
+#include "mongo/db/jsobj.h"
+
+namespace mongo {
+
+    class ServerStatusMetric {
+    public:
+        /**
+         * @param name is a dotted path of a counter name
+         *             if name starts with . its treated as a path from the serverStatus root
+         *             otherwise it will live under the "counters" namespace
+         *             so foo.bar would be serverStatus().counters.foo.bar
+         */
+        ServerStatusMetric(const std::string& name);
+        virtual ~ServerStatusMetric(){}
+
+        std::string getMetricName() const { return _name; }
+
+        virtual void appendAtLeaf( BSONObjBuilder& b ) const = 0;
+
+    protected:
+        static string _parseLeafName( const std::string& name );
+
+        const std::string _name;
+        const std::string _leafName;
+    };
+
+    /**
+     * usage
+     *
+     * declared once
+     *    Counter counter;
+     *    ServerStatusMetricField myAwesomeCounterDisplay( "path.to.counter", &counter );
+     *
+     * call
+     *    counter.hit();
+     *
+     * will show up in db.serverStatus().metrics.path.to.counter
+     */
+    template< typename T >
+    class ServerStatusMetricField : public ServerStatusMetric {
+    public:
+        ServerStatusMetricField( const std::string& name, const T* t )
+            : ServerStatusMetric(name), _t(t) {
+        }
+
+        const T* get() { return _t; }
+
+        virtual void appendAtLeaf( BSONObjBuilder& b ) const {
+            b.append( _leafName, *_t );
+        }
+
+    private:
+        const T* _t;
+    };
+
+}
+