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A continuously growing collection of utilities to measure performance, get better diagnostics, improve performance, or do things more reliably, faster that other open source libraries...
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/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * Licensed 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.spf4j.concurrent;

import com.google.common.cache.CacheLoader;
import com.google.common.cache.CacheStats;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableMap;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
import javax.annotation.ParametersAreNonnullByDefault;
import org.spf4j.base.UncheckedExecutionException;

/**
 * @author zoly
 * @deprecated use UnboundedLoadingCache instead.
 */
@Deprecated
@ParametersAreNonnullByDefault
public final class UnboundedRacyLoadingCache implements LoadingCache {

  private final ConcurrentMap map;

  private final CacheLoader loader;

  public UnboundedRacyLoadingCache(final int initialSize, final CacheLoader loader) {
    this(initialSize, 8, loader);
  }

  public UnboundedRacyLoadingCache(final int initialSize, final int concurrency, final CacheLoader loader) {
    this.map = new ConcurrentHashMap<>(
            initialSize, 0.75f, concurrency);
    this.loader = loader;
  }

  @Override
  public V get(final K key) throws ExecutionException {
    V val = map.get(key);
    if (val == null) {
      try {
        val = loader.load(key);
      } catch (Exception ex) {
        throw new ExecutionException(ex);
      }
      map.put(key, val);
    }
    return val;
  }

  @Override
  public V getUnchecked(final K key) {
    try {
      return get(key);
    } catch (ExecutionException ex) {
      throw new UncheckedExecutionException(ex);
    }
  }

  @Override
  @SuppressFBWarnings("RV_RETURN_VALUE_IGNORED")
  public ImmutableMap getAll(final Iterable keys) throws ExecutionException {
    ImmutableMap.Builder builder = ImmutableMap.builder();
    for (K key : keys) {
      builder.put(key, get(key));
    }
    return builder.build();
  }

  @Override
  @SuppressFBWarnings("NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE")
  public V apply(final K key) {
    return getUnchecked(key);
  }

  @Override
  @SuppressFBWarnings("RV_RETURN_VALUE_IGNORED")
  public void refresh(final K key) {
    try {
      V val = loader.load(key);
      map.put(key, val);
    } catch (Exception ex) {
      throw new UncheckedExecutionException(ex);
    }
  }

  @Override
  public ConcurrentMap asMap() {
    throw new UnsupportedOperationException();
  }

  @Override
  public V getIfPresent(final Object key) {
    return map.get(key);
  }

  @Override
  public V get(final K key, final Callable valueLoader) throws ExecutionException {
    V val = map.get(key);
    if (val == null) {
      try {
        val = valueLoader.call();
      } catch (Exception ex) {
        throw new ExecutionException(ex);
      }
      map.put(key, val);
    }
    return val;
  }

  @Override
  @SuppressFBWarnings("RV_RETURN_VALUE_IGNORED")
  public ImmutableMap getAllPresent(final Iterable keys) {
    ImmutableMap.Builder builder = ImmutableMap.builder();
    for (K key : (Iterable) keys) {
      V val = getIfPresent(key);
      if (val != null) {
        builder.put(key, val);
      }
    }
    return builder.build();
  }

  @Override
  public void put(final K key, final V value) {
    map.put(key, value);
  }

  @Override
  public void putAll(final Map m) {
    for (Map.Entry entry : m.entrySet()) {
      put(entry.getKey(), entry.getValue());
    }
  }

  @Override
  public void invalidate(final Object key) {
    map.remove(key);
  }

  @Override
  public void invalidateAll(final Iterable keys) {
    for (K key : (Iterable) keys) {
      invalidate(key);
    }
  }

  @Override
  public void invalidateAll() {
    map.clear();
  }

  @Override
  public long size() {
    return map.size();
  }

  @Override
  public CacheStats stats() {
    throw new UnsupportedOperationException("Not supported");
  }

  @Override
  public void cleanUp() {
    map.clear();
  }

  @Override
  public String toString() {
    return "UnboundedRacyLoadingCache{" + "map=" + map + ", loader=" + loader + '}';
  }

}