org.apache.logging.log4j.message.ParameterizedNoReferenceMessageFactory Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.logging.log4j.message;

import org.apache.logging.log4j.status.StatusLogger;

/**
 * Specialized {@link ParameterizedMessageFactory} that creates {@link SimpleMessage} objects that do not retain a
 * reference to the parameter object.
 * 
 * Intended for use by the {@link StatusLogger}: this logger retains a queue of recently logged messages in memory,
 * causing memory leaks in web applications. (LOG4J2-1176)
 * 
 * 
 * This class is immutable.
 * 
 */
public final class ParameterizedNoReferenceMessageFactory extends AbstractMessageFactory {

    /**
     * Instance of ParameterizedStatusMessageFactory.
     */
    public static final ParameterizedNoReferenceMessageFactory INSTANCE = new ParameterizedNoReferenceMessageFactory();

    private static final long serialVersionUID = 1L;

    /**
     * Creates {@link SimpleMessage} instances containing the formatted parameterized message string.
     * 
     * @param message The message pattern.
     * @param params The message parameters.
     * @return The Message.
     *
     * @see MessageFactory#newMessage(String, Object...)
     */
    @Override
    public Message newMessage(final String message, final Object... params) {
        if (params == null) {
            return new SimpleMessage(message);
        }
        final String formatted = new ParameterizedMessage(message, params).getFormattedMessage();
        return new SimpleMessage(formatted);
    }
}