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    • com.cedarsoftware.util.GuavaCache.groovy Maven / Gradle / Ivy

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    /*
 * Copyright 2002-2015 the original author or authors.
 *
 * 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 com.cedarsoftware.util

import groovy.transform.CompileStatic
import org.springframework.cache.Cache
import org.springframework.cache.support.NullValue

import java.util.concurrent.Callable
import java.util.concurrent.ExecutionException

import com.google.common.cache.LoadingCache
import com.google.common.util.concurrent.UncheckedExecutionException

import org.springframework.cache.support.AbstractValueAdaptingCache
import org.springframework.util.Assert

/**
 * Spring {@link org.springframework.cache.Cache} adapter implementation
 * on top of a Guava {@link com.google.common.cache.Cache} instance.
 *
 * 
    Requires Google Guava 12.0 or higher.
 *
 * @author Juergen Hoeller
 * @author Stephane Nicoll
 * @since 4.0
 */
@CompileStatic
class GuavaCache extends AbstractValueAdaptingCache implements Cache
{
    private final String name

    private final com.google.common.cache.Cache cache

    /**
     * Create a {@link GuavaCache} instance with the specified name and the
     * given internal {@link com.google.common.cache.Cache} to use.
     * @param name the name of the cache
     * @param cache the backing Guava Cache instance
     */
    GuavaCache(String name, com.google.common.cache.Cache cache)
    {
        this(name, cache, true)
    }

    /**
     * Create a {@link GuavaCache} instance with the specified name and the
     * given internal {@link com.google.common.cache.Cache} to use.
     * @param name the name of the cache
     * @param cache the backing Guava Cache instance
     * @param allowNullValues whether to accept and convert {@code null}
     * values for this cache
     */
    GuavaCache(String name, com.google.common.cache.Cache cache, boolean allowNullValues)
    {
        super(allowNullValues)
        Assert.notNull(name, "Name must not be null")
        Assert.notNull(cache, "Cache must not be null")
        this.name = name
        this.cache = cache
    }


    final String getName()
    {
        return name
    }

    final com.google.common.cache.Cache getNativeCache()
    {
        return cache
    }

    Map asMap()
    {
        return cache.asMap()
    }

    ValueWrapper get(Object key)
    {
        if (this.cache instanceof LoadingCache)
        {
            try
            {
                Object value = ((LoadingCache) this.cache).get(key)
                return toValueWrapper(value)
            }
            catch (ExecutionException ex)
            {
                throw new UncheckedExecutionException(ex.message, ex)
            }
        }
        return super.get(key)
    }

    @SuppressWarnings("unchecked")
     T get(Object key, final Callable valueLoader)
    {
        try
        {
            return (T) fromStoreValue(this.cache.get(key, new Callable() {
                Object call() throws Exception
                {
                    return storeValue(valueLoader.call())
                }
            }))
        }
        catch (ExecutionException ex)
        {
            throw new ValueRetrievalException(key, valueLoader, ex.cause)
        }
        catch (UncheckedExecutionException ex)
        {
            throw new ValueRetrievalException(key, valueLoader, ex.cause)
        }
    }

    protected Object lookup(Object key)
    {
        return cache.getIfPresent(key)
    }

    void put(Object key, Object value)
    {
        cache.put(key, storeValue(value))
    }

    ValueWrapper putIfAbsent(Object key, final Object value)
    {
        try
        {
            PutIfAbsentCallable callable = new PutIfAbsentCallable(value)
            Object result = this.cache.get(key, callable)
            return (callable.called ? null : toValueWrapper(result))
        }
        catch (ExecutionException ex)
        {
            throw new IllegalStateException(ex)
        }
    }

    void evict(Object key)
    {
        cache.invalidate(key)
    }

    void clear()
    {
        cache.invalidateAll()
    }

    private class PutIfAbsentCallable implements Callable
    {
        private final Object value
        private boolean called

        PutIfAbsentCallable(Object value)
        {
            this.value = value
        }

        Object call() throws Exception
        {
            this.called = true
            return storeValue(this.value)
        }
    }

    /**
     * Convert the given user value, as passed into the put method,
     * to a value in the internal store (adapting {@code null}).
     * @param userValue the given user value
     * @return the value to store
     */
    protected Object storeValue(Object userValue)
    {
        if (this.allowNullValues && userValue == null)
        {
            return NullValue.INSTANCE
        }
        return userValue
    }

}
    
    
    
    

    




    
    
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