SERVER-10084 New logging implementation.

This change-set:

* Introduces a new top-level directory, mongo/logger, containing most of the implementation of logging functionality formerly found in log.cpp/log.h.

* Cleans up existing, unusual uses of the logging system that were not trivially compatible with the new implementation.

* Replaces Logstream/Nulstream with a LogstreamBuilder object, whose destructor writes log messages.  This new LogstreamBuilder is reentrant, unlike the old logging code, which was thread-safe but not reentrant.  Additionally, std::endl is no longer required to terminate a log line.  When a LogstreamBuilder goes out of scope, the log message gets committed.

* Separates the log system into several components: a global LogManager, several LogDomains, various kinds of Appenders (e.g., SyslogAppender) and Encoders (for formatting messages).

* Allows unit tests to capture and examine log output.

This patch does _not_ introduce support for hierarchical log domains, or for enabling and disabling specific log domains when the server is running in a multi-threaded mode.  This is future work.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/mongo/dbtests/documenttests.cpp b/src/mongo/dbtests/documenttests.cpp
index 073127550bd..73075d039a3 100644
--- a/src/mongo/dbtests/documenttests.cpp
+++ b/src/mongo/dbtests/documenttests.cpp
@@ -1285,7 +1285,8 @@ namespace DocumentTests {
                 assertComparison(expectedResult, fromBson(a), fromBson(b));
             }
             void assertComparison(int expectedResult, const Value& a, const Value& b) {
-                log() << "testing " << a.toString() << " and " << b.toString() << endl;
+                mongo::unittest::log() <<
+                    "testing " << a.toString() << " and " << b.toString() << endl;
                 // reflexivity
                 ASSERT_EQUALS(0, cmp(a, a));
                 ASSERT_EQUALS(0, cmp(b, b));