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--- gaudi:outputlevel [2009/01/28 12:16] – created nchiap
+++ gaudi:outputlevel [2010/03/19 10:05] (current) – nchiap
@@ Line 1: / Line 1: @@
-=== Output Levels ===
+====== Output Levels ======
-Any message with the given level or higher will be printed.
+===== Idea =====
+In the Gaudi-framework, there exist several layers of print-statements. According to the level which is set (f. ex. in an options-file), any message with this level or higher will be printed.
-== Normal Output Levels ==
+===== Normal Output Levels =====
   * DEBUG (2)
   * INFO (3)
@@ Line 8: / Line 9: @@
   * ERROR (5)
   * FATAL (6)
-== Additional ==
-additionally the following constants are definded:
+===== Additional =====
+Additionally the following constants are definded:
   * NIL (0)
   * VERBOSE (1)
   * ALWAYS (7)
   * NUM_LEVELS (8)
+===== Add output statements to your code =====
+In your C++-code, you can add these statements the following way, f.ex:
+<code c++>
+// (A)
+warning() << "Could not retrieve tracks. Skipping" << endmsg;
+// (B)
+if ( msgLevel(MSG::WARNING) ) warning() << "Could not retrieve tracks. Skipping" << endmsg;
+</code>
+All the other messages are printed by replacing "warning" with the appropriate level.
+Version (B) runs faster when the message level set will not display this message. Therefore version (B) should be used for low-level messages (Debug, Info, Warning) while version (A) is better for Error or Fatal messages.
+===== Change the output level in the options file =====
+In the options file, you can change the output level for a given class by setting:
+<code>
+myClass.OutputLevel = 4
+</code>
+for example for a tool:
+<code>
+Tuple.TupleToolEventInfo.OutputLevel = 4
+</code>

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