COMPMID-619: Logging interface

Change-Id: I73d1433ee7a682aeabb7540aa2ea1f6564f90aae
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/91775
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/arm_compute/core/utils/logging/LoggerRegistry.h b/arm_compute/core/utils/logging/LoggerRegistry.h
new file mode 100644
index 0000000..d861476
--- /dev/null
+++ b/arm_compute/core/utils/logging/LoggerRegistry.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_LOGGING_LOGGER_REGISTRY_H__
+#define __ARM_COMPUTE_LOGGING_LOGGER_REGISTRY_H__
+
+#include "arm_compute/core/utils/logging/Logger.h"
+#include "arm_compute/core/utils/logging/Printers.h"
+#include "arm_compute/core/utils/logging/Types.h"
+#include "support/Mutex.h"
+
+#include <memory>
+#include <set>
+#include <unordered_map>
+
+namespace arm_compute
+{
+namespace logging
+{
+/** Registry class holding all the instantiated loggers */
+class LoggerRegistry final
+{
+public:
+    /** Gets registry instance
+     *
+     * @return Logger registry instance
+     */
+    static LoggerRegistry &get();
+    /** Creates a logger
+     *
+     * @note Some names are reserved e.g. [CORE, RUNTIME, GRAPH]
+     *
+     * @param[in] name      Logger's name
+     * @param[in] log_level Logger's log level
+     * @param[in] printers  Printers to attach to the system loggers
+     */
+    void create_logger(const std::string &name, LogLevel log_level, std::vector<std::shared_ptr<Printer>> printers = {});
+    /** Remove a logger
+     *
+     * @param name Logger's name
+     */
+    void remove_logger(const std::string &name);
+    /** Returns a logger instance
+     *
+     * @param[in] name Logger to return
+     *
+     * @return Logger
+     */
+    std::shared_ptr<Logger> logger(const std::string &name);
+    /** Creates reserved library loggers
+     *
+     * @param[in] log_level Logger's log level
+     * @param[in] printers  Printers to attach to the system loggers
+     */
+    void create_reserved_loggers(LogLevel log_level, std::vector<std::shared_ptr<Printer>> printers = {});
+
+private:
+    /** Default constructor */
+    LoggerRegistry();
+
+private:
+    arm_compute::Mutex _mtx;
+    std::unordered_map<std::string, std::shared_ptr<Logger>> _loggers;
+    static std::set<std::string> _reserved_loggers;
+};
+} // namespace logging
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_LOGGING_LOGGER_REGISTRY_H__ */