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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.logging.api;
/**
* <a>Factory to hide a concrete, framework-specific implementation of logger creation.</a>
*
* <p>The service used by this factory must implement {@link LoggerCreationService}. If no implementation has been
* configured or could not be instantiated, a <b>no-op logger</b> will be used, and <b>no events</b> will be logged.
* This is done to prevent recursion if attempts are being made to log exceptions that resulted from logger
* initialization.
* </p>
*
* @author evitaliy
* @since 13/09/2016.
*
* @see BaseFactory
* @see LoggerCreationService
*/
@SuppressWarnings("ThrowableInstanceNeverThrown")
public class LoggerFactory extends BaseFactory {
private static final LoggerCreationService SERVICE;
static {
LoggerCreationService service;
try {
service = locateService(LoggerCreationService.class);
} catch (Throwable e) {
new RuntimeException("Failed to instantiate logger factory", e).printStackTrace();
// use the no-op service to prevent recursion in case of an attempt to log an exception as a
// result of a logger initialization error
service = new NoOpLoggerCreationService();
}
SERVICE = service;
}
public static Logger getLogger(String clazzName) {
return SERVICE.getLogger(clazzName);
}
public static Logger getLogger(Class<?> clazz) {
return SERVICE.getLogger(clazz);
}
private static class NoOpLoggerCreationService implements LoggerCreationService {
private static final Logger NO_OP_LOGGER = new Logger() {
@Override
public String getName() {
return "No-Op Logger";
}
@Override
public boolean isMetricsEnabled() {
return false;
}
@Override
public void metrics(String msg) { }
@Override
public void metrics(String msg, Object arg) { }
@Override
public void metrics(String msg, Object arg1, Object arg2) { }
@Override
public void metrics(String msg, Object... arguments) { }
@Override
public void metrics(String msg, Throwable t) { }
@Override
public boolean isAuditEnabled() {
return false;
}
@Override
public void audit(String msg) { }
@Override
public void audit(String msg, Object arg) { }
@Override
public void audit(String msg, Object arg1, Object arg2) { }
@Override
public void audit(String msg, Object... arguments) { }
@Override
public void audit(String msg, Throwable t) { }
@Override
public boolean isDebugEnabled() {
return false;
}
@Override
public void debug(String msg) { }
@Override
public void debug(String msg, Object arg) { }
@Override
public void debug(String msg, Object arg1, Object arg2) { }
@Override
public void debug(String msg, Object... arguments) { }
@Override
public void debug(String msg, Throwable t) { }
@Override
public boolean isInfoEnabled() {
return false;
}
@Override
public void info(String msg) { }
@Override
public void info(String msg, Object arg) { }
@Override
public void info(String msg, Object arg1, Object arg2) { }
@Override
public void info(String msg, Object... arguments) { }
@Override
public void info(String msg, Throwable t) { }
@Override
public boolean isWarnEnabled() {
return false;
}
@Override
public void warn(String msg) { }
@Override
public void warn(String msg, Object arg) { }
@Override
public void warn(String msg, Object... arguments) { }
@Override
public void warn(String msg, Object arg1, Object arg2) { }
@Override
public void warn(String msg, Throwable t) { }
@Override
public boolean isErrorEnabled() {
return false;
}
@Override
public void error(String msg) { }
@Override
public void error(String msg, Object arg) { }
@Override
public void error(String msg, Object arg1, Object arg2) { }
@Override
public void error(String msg, Object... arguments) { }
@Override
public void error(String msg, Throwable t) { }
};
@Override
public Logger getLogger(String className) {
return NO_OP_LOGGER;
}
@Override
public Logger getLogger(Class<?> clazz) {
return NO_OP_LOGGER;
}
}
}
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