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A starter for Spring Boot that provides autoconfiguration for Wro4j.

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/*
 * Copyright 2015-2020 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 ac.simons.spring.boot.wro4j;

import java.util.function.Function;

import ro.isdc.wro.cache.CacheStrategy;

import org.springframework.cache.Cache;
import org.springframework.cache.Cache.ValueWrapper;
import org.springframework.cache.CacheManager;

/**
 * A simple strategy based on Spring caches. Delegates the heavy lifting to the
 * cache configured by or through Spring.
 *
 * @param  Type of the keys
 * @param  Type of the values
 * @author Michael J. Simons
 * @since 2016-01-18
 */
class SpringCacheStrategy implements CacheStrategy {

	private final CacheManager cacheManager;

	private final String cacheName;

	SpringCacheStrategy(final CacheManager cacheManager, final String cacheName) {
		this.cacheManager = cacheManager;
		this.cacheName = cacheName;
	}

	@Override
	public void put(final K key, final V value) {

		doWithCache(cache -> {
			cache.put(key, value);
			return null;
		});
	}

	@Override
	public V get(final K key) {
		@SuppressWarnings("unchecked")
		V result = (V) doWithCache(cache -> {
			ValueWrapper w = cache.get(key);
			return w == null ? null : w.get();
		});
		return result;
	}

	@Override
	public void clear() {
		doWithCache(cache -> {
			cache.clear();
			return null;
		});
	}

	private Object doWithCache(Function consumer) {
		Cache cache = this.cacheManager.getCache(cacheName);
		if (cache == null) {
			return null;
		}
		return consumer.apply(cache);
	}

	@Override
	public void destroy() {
		this.clear();
	}

}