1 files changed, 84 insertions, 0 deletions
diff --git a/src/mongo/util/trace.h b/src/mongo/util/trace.h
new file mode 100755
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--- /dev/null
+++ b/src/mongo/util/trace.h
@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) 2012 10gen 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/>.
+ */
+
+#pragma once
+
+#include "pch.h"
+
+#include <boost/unordered_map.hpp>
+#include "util/concurrency/rwlock.h"
+
+
+namespace mongo {
+
+    class Trace :
+        public boost::noncopyable {
+    public:
+
+#ifdef LATER
+        /**
+           Set the traces with the given names.
+
+           @param name comma separated trace names
+        */
+        static void setTraces(const string &names);
+#endif
+
+        static void setTrace(const string &name, unsigned level);
+
+        /**
+           Test to see if the given trace is on or off.
+
+           @param name the name of the trace to check
+           @returns true if the trace is on, false otherwise
+        */
+        static unsigned getTrace(const string &name);
+
+    private:
+        Trace();
+        ~Trace();
+
+        struct Hash :
+        unary_function<string, size_t> {
+            size_t operator()(const string &rS) const;
+        };
+
+        typedef boost::unordered_map<string, unsigned, Trace::Hash> MapType;
+        class NameMap {
+        public:
+            NameMap();
+
+            MapType traces;
+        };
+
+        static NameMap *pMap; /* used by Trace(), so precedes it */
+        static SimpleRWLock lock; /* used by Trace(), so precedes it */
+        static Trace trace;
+    };
+
+}
+
+/* ======================= PRIVATE IMPLEMENTATIONS ========================== */
+
+namespace mongo {
+
+    inline size_t Trace::Hash::operator()(const string &rS) const {
+        size_t seed = 0xf0afbeef;
+        boost::hash_combine(seed, rS);
+        return seed;
+    }
+
+}