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Logback: the reliable, generic, fast and flexible logging framework. Copyright (C) 1999-2011, All rights reserved. This program and the accompanying materials are dual-licensed under either the terms of the Eclipse Public License v1.0 as published by the Eclipse Foundation or (per the licensee's choosing) under the terms of the GNU Lesser General Public License version 2.1 as published by the Free Software Foundation.
package ch.qos.logback.classic.turbo;
Clients of this class should only use the getMessageCountAndThenIncrement(java.lang.String) method. Other methods inherited via LinkedHashMap are not thread safe.
  private static final long serialVersionUID = 1L;
  final int cacheSize;
  LRUMessageCache(int cacheSize) {
    super((int) (cacheSize * (4.0f / 3)), 0.75f, true);
    if (cacheSize < 1) {
      throw new IllegalArgumentException("Cache size cannot be smaller than 1");
    this. = cacheSize;
    // don't insert null elements
    if (msg == null) {
      return 0;
    Integer i;
    // LinkedHashMap is not LinkedHashMap. See also LBCLASSIC-255
    synchronized (this) {
      i = super.get(msg);
      if (i == null) {
        i = 0;
      } else {
        i = i + 1;
    return i;
  // called indirectly by get() or put() which are already supposed to be
  // called from within a synchronized block
  protected boolean removeEldestEntry(Map.Entry eldest) {
    return (size() > );
  synchronized public void clear() {
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