logger.go

// Copyright (C) 2014 Space Monkey, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   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.

package spacelog

import (
	"sync"
	"sync/atomic"
)

// Logger is the basic type that allows for logging. A logger has an associated
// name, given to it during construction, either through a logger collection,
// GetLogger, GetLoggerNamed, or another Logger's Scope method. A logger also
// has an associated level and handler, typically configured through the logger
// collection to which it belongs.
type Logger struct {
	level      LogLevel
	name       string
	collection *LoggerCollection

	handler_mtx sync.RWMutex
	handler     Handler
}

// Scope returns a new Logger with the same level and handler, using the
// receiver Logger's name as a prefix.
func (l *Logger) Scope(name string) *Logger {
	return l.collection.getLogger(l.name+"."+name, l.getLevel(),
		l.getHandler())
}

func (l *Logger) setLevel(level LogLevel) {
	atomic.StoreInt32((*int32)(&l.level), int32(level))
}

func (l *Logger) getLevel() LogLevel {
	return LogLevel(atomic.LoadInt32((*int32)(&l.level)))
}

func (l *Logger) setHandler(handler Handler) {
	l.handler_mtx.Lock()
	defer l.handler_mtx.Unlock()
	l.handler = handler
}

func (l *Logger) getHandler() Handler {
	l.handler_mtx.RLock()
	defer l.handler_mtx.RUnlock()
	return l.handler
}