SOLR-13659: Remove unused SolrCacheHolder

accidental leftover from reverted plugin work

solr/core/src/java/org/apache/solr/search/SolrCacheHolder.java

@@ -1,150 +0,0 @@
-/*
- * 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.solr.search;
-
-import java.lang.invoke.MethodHandles;
-import java.util.Map;
-import java.util.function.Function;
-
-import org.apache.solr.metrics.SolrMetricsContext;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-public class SolrCacheHolder<K, V> implements SolrCache<K,V> {
-  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
-
-
-  private final CacheConfig factory;
-  protected volatile SolrCache<K, V> delegate;
-
-  public SolrCacheHolder(SolrCache<K, V> delegate, CacheConfig factory) {
-    this.delegate = delegate;
-    this.factory = factory;
-  }
-
-  public int size() {
-    return delegate.size();
-  }
-
-  public V put(K key, V value) {
-    return delegate.put(key, value);
-  }
-
-  @Override
-  public V remove(K key) {
-    return delegate.remove(key);
-  }
-
-  public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
-    return delegate.computeIfAbsent(key, mappingFunction);
-  }
-
-  public V get(K key) {
-    return delegate.get(key);
-  }
-
-  public void clear() {
-    delegate.clear();
-  }
-
-  @Override
-  public void setState(State state) {
-    delegate.setState(state);
-  }
-
-  @Override
-  public State getState() {
-    return delegate.getState();
-  }
-
-  @Override
-  public void warm(SolrIndexSearcher searcher, SolrCache<K, V> old) {
-    if (old instanceof SolrCacheHolder) old = ((SolrCacheHolder) old).get();
-    delegate.warm(searcher, old);
-
-  }
-
-  public SolrCache<K, V> get() {
-    return delegate;
-  }
-
-  public void close() throws Exception {
-    delegate.close();
-  }
-
-  @Override
-  public int getMaxSize() {
-    return delegate.getMaxSize();
-  }
-
-  @Override
-  public void setMaxSize(int maxSize) {
-    delegate.setMaxSize(maxSize);
-  }
-
-  @Override
-  public int getMaxRamMB() {
-    return delegate.getMaxRamMB();
-  }
-
-  @Override
-  public void setMaxRamMB(int maxRamMB) {
-    delegate.setMaxRamMB(maxRamMB);
-  }
-
-  public void warm(SolrIndexSearcher searcher, SolrCacheHolder src) {
-    delegate.warm(searcher, src.get());
-  }
-
-  @Override
-  public Object init(Map args, Object persistence, CacheRegenerator regenerator) {
-    return null;
-  }
-
-  @Override
-  public String name() {
-    return delegate.name();
-  }
-
-
-  @Override
-  public String getName() {
-    return delegate.getName();
-  }
-
-  @Override
-  public String getDescription() {
-    return delegate.getDescription();
-  }
-
-  @Override
-  public Category getCategory() {
-    return delegate.getCategory();
-  }
-
-  @Override
-  public void initializeMetrics(SolrMetricsContext parentContext, String scope) {
-    delegate.initializeMetrics(parentContext, scope);
-  }
-
-  @Override
-  public SolrMetricsContext getSolrMetricsContext() {
-    return delegate.getSolrMetricsContext();
-  }
-
-}