com.hazelcast.org.slf4j.impl.StaticLoggerBinder Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in com.hazelcast.com.liance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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 com.hazelcast.org.slf4j.impl;
import com.hazelcast.org.slf4j.ILoggerFactory;
import com.hazelcast.org.slf4j.helpers.NOPLoggerFactory;
import com.hazelcast.org.slf4j.spi.LoggerFactoryBinder;
/**
* Apache Calcite has a dependency on the {@code slf4j-api} artifact. In order to JAR hell in the runtime, we shade and
* relocate the {@code slf4j-api} library into the {@code com.hazelcast.com.hazelcast} package during build.
*
* SLF4J requires exactly one {@code StaticLoggerBinder} class to be in the JVM classpath. Otherwise a warning is printed
* into the {@code System.err} unconditionally. See {@code LoggerFactory.bind} for more details.
*
* This class helps us get rid of the warning. During relocation both this class and {@code LoggerFactory} are moved to the
* the {@code com.hazelcast.com.hazelcast} package. As a result the relocated factory finds the relocated binder and no warning is produced.
*
* At the same time, the normal SLF4J dependency still looks for the binder at the usual location, and therefore other runtime
* classes that use SLF4J are not affected. That is, the current binder affects only the relocated Apache Calcite classes.
*
* The binder delegates to the no-op logger factory, suppressing all messages from the relocated Apache Calcite.
*/
public class StaticLoggerBinder implements LoggerFactoryBinder {
private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
public static StaticLoggerBinder getSingleton() {
return SINGLETON;
}
@Override
public ILoggerFactory getLoggerFactory() {
return new NOPLoggerFactory();
}
@Override
public String getLoggerFactoryClassStr() {
return StaticLoggerBinder.class.getName();
}
}