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#ifndef LOGGER_H
#define LOGGER_H
/*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "Selector.h"
#include "qpid/sys/Mutex.h"
#include <boost/ptr_container/ptr_vector.hpp>
#include <boost/noncopyable.hpp>
#include <set>
namespace qpid {
namespace log {
class Options;
/**
* Central logging agent.
*
* Thread safe, singleton.
*/
class Logger : private boost::noncopyable {
public:
/** Flags indicating what to include in the log output */
enum FormatFlag { FILE=1, LINE=2, FUNCTION=4, LEVEL=8, TIME=16, THREAD=32};
/** Interface for log output destination.
*
* Implementations must be thread safe.
*/
class Output {
public:
Output();
virtual ~Output();
/** Receives the statemnt of origin and formatted message to log. */
virtual void log(const Statement&, const std::string&) =0;
};
static Logger& instance();
Logger();
~Logger();
/** Select the messages to be logged. */
void select(const Selector& s);
/** Set the formatting flags, bitwise OR of FormatFlag values. */
void format(int formatFlags);
/** Set format flags from options object.
*@returns computed flags.
*/
int format(const Options&);
/** Configure logger from Options */
void configure(const Options& o, const std::string& progname);
/** Add a statement. */
void add(Statement& s);
/** Log a message. */
void log(const Statement&, const std::string&);
/** Add an ostream to outputs.
*
* The ostream must not be destroyed while the Logger might
* still be using it. This is the case for std streams cout,
* cerr, clog.
*/
void output(std::ostream&);
/** Add syslog to outputs. */
void syslog(const std::string& programName);
/** Add an output.
*@param name a file name or one of the special tokens:
*stdout, stderr, syslog.
*/
void output(const std::string& name);
/** Add an output destination for messages */
void output(std::auto_ptr<Output> out);
/** Reset the logger to it's original state. */
void clear();
private:
typedef boost::ptr_vector<Output> Outputs;
typedef std::set<Statement*> Statements;
sys::Mutex lock;
inline void enable_unlocked(Statement* s);
std::string syslogName;
Statements statements;
Outputs outputs;
Selector selector;
int flags;
};
}} // namespace qpid::log
#endif /*!LOGGER_H*/
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