org.springframework.core.log.CompositeLog Maven / Gradle / Ivy
/*
* Copyright 2002-2018 the original author or authors.
*
* 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
*
* https://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 org.springframework.core.log;
import java.util.List;
import java.util.function.Predicate;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.impl.NoOpLog;
/**
* Implementation of {@link Log} that wraps a list of loggers and delegates
* to the first one for which logging is enabled at the given level.
*
* @author Rossen Stoyanchev
* @since 5.1
* @see LogDelegateFactory#getCompositeLog
*/
final class CompositeLog implements Log {
private static final Log NO_OP_LOG = new NoOpLog();
private final Log fatalLogger;
private final Log errorLogger;
private final Log warnLogger;
private final Log infoLogger;
private final Log debugLogger;
private final Log traceLogger;
/**
* Constructor with list of loggers. For optimal performance, the constructor
* checks and remembers which logger is on for each log category.
* @param loggers the loggers to use
*/
public CompositeLog(List loggers) {
this.fatalLogger = initLogger(loggers, Log::isFatalEnabled);
this.errorLogger = initLogger(loggers, Log::isErrorEnabled);
this.warnLogger = initLogger(loggers, Log::isWarnEnabled);
this.infoLogger = initLogger(loggers, Log::isInfoEnabled);
this.debugLogger = initLogger(loggers, Log::isDebugEnabled);
this.traceLogger = initLogger(loggers, Log::isTraceEnabled);
}
private static Log initLogger(List loggers, Predicate predicate) {
return loggers.stream().filter(predicate).findFirst().orElse(NO_OP_LOG);
}
@Override
public boolean isFatalEnabled() {
return this.fatalLogger != NO_OP_LOG;
}
@Override
public boolean isErrorEnabled() {
return this.errorLogger != NO_OP_LOG;
}
@Override
public boolean isWarnEnabled() {
return this.warnLogger != NO_OP_LOG;
}
@Override
public boolean isInfoEnabled() {
return this.infoLogger != NO_OP_LOG;
}
@Override
public boolean isDebugEnabled() {
return this.debugLogger != NO_OP_LOG;
}
@Override
public boolean isTraceEnabled() {
return this.traceLogger != NO_OP_LOG;
}
@Override
public void fatal(Object message) {
this.fatalLogger.fatal(message);
}
@Override
public void fatal(Object message, Throwable ex) {
this.fatalLogger.fatal(message, ex);
}
@Override
public void error(Object message) {
this.errorLogger.error(message);
}
@Override
public void error(Object message, Throwable ex) {
this.errorLogger.error(message, ex);
}
@Override
public void warn(Object message) {
this.warnLogger.warn(message);
}
@Override
public void warn(Object message, Throwable ex) {
this.warnLogger.warn(message, ex);
}
@Override
public void info(Object message) {
this.infoLogger.info(message);
}
@Override
public void info(Object message, Throwable ex) {
this.infoLogger.info(message, ex);
}
@Override
public void debug(Object message) {
this.debugLogger.debug(message);
}
@Override
public void debug(Object message, Throwable ex) {
this.debugLogger.debug(message, ex);
}
@Override
public void trace(Object message) {
this.traceLogger.trace(message);
}
@Override
public void trace(Object message, Throwable ex) {
this.traceLogger.trace(message, ex);
}
}