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/*
 * 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.util.PerformanceSensitive;
import org.apache.logging.log4j.util.StringBuilderFormattable;

/**
 * Messages implementing this interface are reused between logging calls.
 * 

* If a Message is reusable, downstream components should not hand over this instance to another thread, but extract its * content (via the {@link StringBuilderFormattable#formatTo(StringBuilder)} method) instead. *

* @see ReusableMessageFactory * @since 2.6 */ @PerformanceSensitive("allocation") public interface ReusableMessage extends Message, StringBuilderFormattable { /** * Returns the parameter array that was used to initialize this reusable message and replaces it with the specified * array. The returned parameter array will no longer be modified by this reusable message. The specified array is * now "owned" by this reusable message and can be modified if necessary for the next log event. *

* ReusableMessages that have no parameters return the specified array. *

* This method is used by asynchronous loggers to pass the parameter array to a background thread without * allocating new objects. * The actual number of parameters in the returned array can be determined with {@link #getParameterCount()}. *

* * @param emptyReplacement the parameter array that can be used for subsequent uses of this reusable message. * This replacement array must have at least 10 elements (the number of varargs supported by the Logger * API). * @return the parameter array for the current message content. This may be a vararg array of any length, or it may * be a reusable array of 10 elements used to hold the unrolled vararg parameters. * @see #getParameterCount() */ Object[] swapParameters(Object[] emptyReplacement); /** * Returns the number of parameters that was used to initialize this reusable message for the current content. *

* The parameter array returned by {@link #swapParameters(Object[])} may be larger than the actual number of * parameters. Callers should use this method to determine how many elements the array contains. *

* @return the current number of parameters */ short getParameterCount(); /** * Returns an immutable snapshot of the current internal state of this reusable message. The returned snapshot * will not be affected by subsequent modifications of this reusable message. * * @return an immutable snapshot of this message */ Message memento(); }




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