uk.ac.ed.inf.ace.utils.SoftCache.java Source code

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Here is the source code for uk.ac.ed.inf.ace.utils.SoftCache.java

Source

/*
 * Copyright 2012 Daniel Renshaw <d.renshaw@sms.ed.ac.uk>.
 *
 * 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 uk.ac.ed.inf.ace.utils;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import java.util.concurrent.TimeUnit;

/**
 * @author "Daniel Renshaw" <d.renshaw@sms.ed.ac.uk>
 */
public class SoftCache extends InstrumentedCache<SupplierEx<?>, Object> {

    public SoftCache(String name, int evictAfterAccessMinutes, int maximumSize) {
        super("Documents",
                CacheBuilder.newBuilder().concurrencyLevel(1)
                        .expireAfterAccess(evictAfterAccessMinutes, TimeUnit.MINUTES).maximumSize(maximumSize)
                        .build(new CacheLoader<SupplierEx<?>, Object>() {
                            @Override
                            public Object load(SupplierEx<?> key) throws Exception {
                                return key.get();
                            }
                        }));
    }

    @SuppressWarnings("unchecked")
    public <T> T get(SupplierEx<T> supplier) throws Exception {
        return (T) super.get(supplier);
    }

    @SuppressWarnings("unchecked")
    public <T> T getUnchecked(SupplierEx<T> supplier) {
        return (T) super.getUnchecked(supplier);
    }
}