Example usage for com.google.common.cache CacheLoader load

Introduction

In this page you can find the example usage for com.google.common.cache CacheLoader load.

Prototype

public abstract V load(K key) throws Exception;

Source Link

Document

Computes or retrieves the value corresponding to key .

Usage

From source file:net.conquiris.lucene.search.GuavaCachingFilter.java

/**
 * Caching factory method. The primary cache is that from the filter key to the cachinf filter.
 * The seondary cache is that contained in the caching filter itself.
 * @param loader Filter loader. Its result will be wrapped in a caching filter.
 * @param primarySize the maximum size of the primary cache.
 * @param primaryDuration the length of time after an entry is last accessed that it should be
 *          automatically removed from the primary cache.
 * @param primaryUnit the unit that {@code primaryDuration} is expressed in
 * @param secondarySize the maximum size of the secondary cache.
 * @param secondaryDuration the length of time after an entry is last accessed that it should be
 *          automatically removed from the secondary cache.
 * @param secondaryUnit the unit that {@code secondaryDuration} is expressed in
 * @throws IllegalArgumentException if any of the sizes is negative
 * @throws IllegalArgumentException if any of the durations is negative
 *//*from   w  w  w  .  j  a v a 2s.  c o  m*/
public static <K, V extends Filter> LoadingCache<K, Filter> cachingFactory(final CacheLoader<K, V> loader,
        final int primarySize, final long primaryDuration, final TimeUnit primaryUnit, final int secondarySize,
        final long secondaryDuration, final TimeUnit secondaryUnit) {
    checkArgument(primarySize >= 0 && primaryDuration >= 0 && secondarySize >= 0 && secondaryDuration >= 0);
    checkNotNull(primaryUnit);
    checkNotNull(secondaryUnit);
    final CacheLoader<K, Filter> primaryLoader = new CacheLoader<K, Filter>() {
        public Filter load(K key) throws Exception {
            return new GuavaCachingFilter(loader.load(key), secondarySize, secondaryDuration, secondaryUnit);
        }
    };
    return CacheBuilder.newBuilder().softValues().maximumSize(primarySize)
            .expireAfterAccess(primaryDuration, primaryUnit).build(primaryLoader);
}

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