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https://github.com/scm-manager/scm-manager.git
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start implementation of guava based CacheManager
This commit is contained in:
Sebastian Sdorra
280
scm-webapp/src/main/java/sonia/scm/cache/GuavaCache.java
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280
scm-webapp/src/main/java/sonia/scm/cache/GuavaCache.java
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/**
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* Copyright (c) 2010, Sebastian Sdorra All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer. 2. Redistributions in
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* binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution. 3. Neither the name of SCM-Manager;
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* nor the names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* http://bitbucket.org/sdorra/scm-manager
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*
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*/
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package sonia.scm.cache;
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//~--- non-JDK imports --------------------------------------------------------
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import com.google.common.cache.CacheBuilder;
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import com.google.common.collect.Sets;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import sonia.scm.Filter;
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//~--- JDK imports ------------------------------------------------------------
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import java.util.Set;
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import java.util.concurrent.TimeUnit;
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/**
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*
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* @author Sebastian Sdorra
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*
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* @param <K>
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* @param <V>
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*/
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public class GuavaCache<K, V> implements Cache<K, V>
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{
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/**
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* the logger for GuavaCache
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*/
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private static final Logger logger =
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LoggerFactory.getLogger(GuavaCache.class);
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//~--- constructors ---------------------------------------------------------
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private String name;
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/**
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* Constructs ...
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*
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*
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* @param configuration
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*/
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public GuavaCache(CacheConfiguration configuration)
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{
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this.name = configuration.getName();
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if (configuration.getCopyStrategy() != null)
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{
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copyStrategy = configuration.getCopyStrategy();
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}
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CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();
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if (configuration.getConcurrencyLevel() != null)
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{
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builder.concurrencyLevel(configuration.getConcurrencyLevel());
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}
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if (configuration.getExpireAfterAccess() != null)
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{
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builder.expireAfterAccess(configuration.getExpireAfterAccess(),
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TimeUnit.MILLISECONDS);
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}
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if (configuration.getExpireAfterWrite() != null)
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{
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builder.expireAfterWrite(configuration.getExpireAfterWrite(),
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TimeUnit.MILLISECONDS);
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}
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if (configuration.getInitialCapacity() != null)
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{
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builder.initialCapacity(configuration.getInitialCapacity());
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}
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if (configuration.getMaximumSize() != null)
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{
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builder.maximumSize(configuration.getMaximumSize());
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}
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if (configuration.getMaximumWeight() != null)
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{
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builder.maximumWeight(configuration.getMaximumWeight());
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}
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if (isEnabled(configuration.getRecordStats()))
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{
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builder.recordStats();
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}
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if (isEnabled(configuration.getSoftValues()))
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{
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builder.softValues();
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}
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if (isEnabled(configuration.getWeakKeys()))
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{
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builder.weakKeys();
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}
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if (isEnabled(configuration.getWeakValues()))
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{
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builder.weakKeys();
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}
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cache = builder.build();
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if (logger.isTraceEnabled())
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{
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logger.trace("create new guava cache from builder: {}", builder);
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}
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}
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//~--- methods --------------------------------------------------------------
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/**
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* Method description
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*
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*/
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@Override
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public void clear()
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{
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if (logger.isDebugEnabled())
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{
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logger.debug("clear cache {}", name);
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}
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cache.invalidateAll();
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}
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/**
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* Method description
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*
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*
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* @param key
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*
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* @return
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*/
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@Override
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public boolean contains(K key)
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{
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return cache.getIfPresent(key) != null;
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}
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/**
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* Method description
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*
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*
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* @param key
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* @param value
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*/
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@Override
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public void put(K key, V value)
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{
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cache.put(key, copyStrategy.copyOnWrite(value));
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}
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/**
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* Method description
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*
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*
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* @param key
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*
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* @return
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*/
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@Override
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public boolean remove(K key)
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{
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cache.invalidate(key);
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return true;
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}
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/**
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* Method description
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*
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*
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* @param filter
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*
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* @return
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*/
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@Override
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public boolean removeAll(Filter<K> filter)
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{
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Set<K> keysToRemove = Sets.newHashSet();
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for (K key : cache.asMap().keySet())
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{
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if (filter.accept(key))
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{
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keysToRemove.add(key);
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}
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}
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boolean result = false;
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if (!keysToRemove.isEmpty())
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{
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cache.invalidateAll(keysToRemove);
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result = true;
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}
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return result;
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}
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//~--- get methods ----------------------------------------------------------
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/**
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* Method description
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*
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*
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* @param key
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*
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* @return
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*/
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@Override
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public V get(K key)
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{
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V value = cache.getIfPresent(key);
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if (value != null)
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{
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value = copyStrategy.copyOnRead(value);
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}
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return value;
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}
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/**
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* Method description
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*
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*
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* @param v
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*
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* @return
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*/
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private boolean isEnabled(Boolean v)
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{
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return (v != null) && v;
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}
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//~--- fields ---------------------------------------------------------------
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/** Field description */
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private com.google.common.cache.Cache<K, V> cache;
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/** Field description */
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private CopyStrategy copyStrategy = CopyStrategy.NONE;
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}
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