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diff --git a/src/lib/hooks/hooks_log.h b/src/lib/hooks/hooks_log.h
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+// Copyright (C) 2013-2015,2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef HOOKS_LOG_H
+#define HOOKS_LOG_H
+
+#include <log/macros.h>
+#include <hooks/hooks_messages.h>
+
+namespace isc {
+namespace hooks {
+
+/// @brief Hooks debug Logging levels
+///
+/// Defines the levels used to output debug messages in the Hooks framework.
+/// Note that higher numbers equate to more verbose (and detailed) output.
+
+// The first level traces normal operations,
+extern const int HOOKS_DBG_TRACE;
+
+// The next level traces each call to hook code.
+extern const int HOOKS_DBG_CALLS;
+
+// Additional information on the calls.  Report each call to a callout (even
+// if there are multiple callouts on a hook) and each status return.
+extern const int HOOKS_DBG_EXTENDED_CALLS;
+
+
+/// @brief Hooks Logger
+///
+/// Define the logger used to log messages.  We could define it in multiple
+/// modules, but defining in a single module and linking to it saves time and
+/// space.
+extern isc::log::Logger hooks_logger;
+
+/// @brief Callouts logger
+///
+/// This is the specialized logger used to log messages pertaining to the
+/// callouts execution. In particular, it logs when the callout is invoked
+/// and when it ends. It also logs the callout execution times.
+extern isc::log::Logger callouts_logger;
+
+} // namespace hooks
+} // namespace isc
+
+#endif // HOOKS_LOG_H