Aggregate Timer warnings.

The Timer code logs a warning if a timer callback is started late or
overruns the start time for the next callback. In cases where there
are a lot of these warnings, the time taken to do the logging itself
severly worsens the situation.

This commit aggregates timer warnings and give a statistical report
every 5 seconds at most.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1036169 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 18 insertions, 0 deletions

diff --git a/cpp/include/qpid/log/Statement.h b/cpp/include/qpid/log/Statement.h
index 8f73175630..7b3ab60b81 100644
--- a/cpp/include/qpid/log/Statement.h
+++ b/cpp/include/qpid/log/Statement.h
@@ -96,6 +96,24 @@ struct Statement {
     } while(0)
 
 /**
+ * FLAG must be a boolean variable. Assigns FLAG to true iff logging
+ * is enabled for LEVEL in the calling context.  Use when extra
+ * support code is needed to generate log messages, to ensure that it
+ * is only run if the logging level is enabled.
+ * e.g.
+ * bool logWarning;
+ * QPID_LOG_TEST(LEVEL, logWarning);
+ * if (logWarning) { do stuff needed for warning log messages }
+ */
+#define QPID_LOG_TEST(LEVEL, FLAG)                              \
+    do {                                                        \
+        using ::qpid::log::Statement;                           \
+        static Statement stmt_= QPID_LOG_STATEMENT_INIT(LEVEL); \
+        static Statement::Initializer init_(stmt_);             \
+        FLAG = stmt_.enabled;                                   \
+    } while(0)
+
+/**
  * Macro for log statements. Example of use:
  * @code
  * QPID_LOG(debug, "There are " << foocount << " foos in the bar.");