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/** |
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$Id$ |
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Copyright (C) 2015 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.listable; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.Set; |
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import net.sf.basedb.core.Item; |
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import net.sf.basedb.core.SyncFilter.SourceItemTransform; |
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import net.sf.basedb.util.listable.TransformCache.CacheKey; |
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/** |
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This is a wrapper transformer factory that can be applied to any other |
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factory in order to provide support for caching. |
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The cache holds the result from {@link SourceItemTransformer#transform(TransformContext, Set)} |
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so that if the same set of source ids are provided it will pick the cache result if |
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available and only forward to the wrapped factory in case no old result exists or if it |
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is too old. |
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|
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@author Nicklas |
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@since 3.16 |
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*/ |
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public class SourceItemTransformerWithCache |
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implements SourceItemTransformerFactory |
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{ |
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|
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private final SourceItemTransformerFactory factory; |
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private final String cacheRegion; |
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|
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/** |
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Create a new source item transformer chain. The chain |
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must contain at least one element and all steps must have |
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matching source and target item types. |
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@throws IllegalArgumentException If the chain is null or empty or have non-matching |
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transformation steps |
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*/ |
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public SourceItemTransformerWithCache(SourceItemTransformerFactory factory) |
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{ |
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this(factory, null); |
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} |
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|
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public SourceItemTransformerWithCache(SourceItemTransformerFactory factory, String cacheRegion) |
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{ |
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this.factory = factory; |
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this.cacheRegion = cacheRegion; |
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} |
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@Override |
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public Item getTargetItem() |
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{ |
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return factory.getTargetItem(); |
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} |
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@Override |
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public List<Item> getSupportedSourceItems(SourceItemTransform transform) |
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{ |
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return factory.getSupportedSourceItems(transform); |
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} |
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|
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@Override |
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public SourceItemTransformer create(Item sourceItemType, SourceItemTransform transform) |
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{ |
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return new TransformerWithCache(factory.create(sourceItemType, transform), transform, cacheRegion); |
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} |
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|
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static class TransformerWithCache |
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implements SourceItemTransformer |
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{ |
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|
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private final SourceItemTransformer transformer; |
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private final SourceItemTransform transform; |
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private final String cacheRegion; |
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TransformerWithCache(SourceItemTransformer transformer, SourceItemTransform transform, String cacheRegion) |
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{ |
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this.transformer = transformer; |
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this.transform = transform; |
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this.cacheRegion = cacheRegion; |
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} |
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|
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@Override |
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public Item getSourceItemType() |
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{ |
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return transformer.getSourceItemType(); |
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} |
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|
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@Override |
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public Item getTargetItemType() |
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{ |
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return transformer.getTargetItemType(); |
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} |
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/** |
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If a cache exists check if it has data for this transform already. |
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If not, forward to the parent transformer and then cache the result |
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for future use. |
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*/ |
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@Override |
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public Set<Integer> transform(TransformContext context, Set<Integer> source) |
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{ |
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Set<Integer> target = null; |
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TransformCache cache = context.getCache(); |
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CacheKey key = null; |
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if (cache != null) |
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{ |
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key = TransformCache.getKey(cacheRegion, getSourceItemType(), getTargetItemType(), transform, source); |
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target = cache.get(key); |
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} |
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if (target == null) |
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{ |
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target = transformer.transform(context, source); |
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if (cache != null) cache.store(key, target); |
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} |
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return Collections.unmodifiableSet(target); |
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} |
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} |
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} |