ch.ralscha.extdirectspring.util.ApiCache.java Source code

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Here is the source code for ch.ralscha.extdirectspring.util.ApiCache.java

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/**
 * Copyright 2010-2014 Ralph Schaer <ralphschaer@gmail.com>
 *
 * 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 ch.ralscha.extdirectspring.util;

import java.lang.ref.SoftReference;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.springframework.stereotype.Service;

@Service
public class ApiCache {

    private final Map<ApiCacheKey, SoftReference<String>> cache;

    public ApiCache() {
        cache = new ConcurrentHashMap<ApiCacheKey, SoftReference<String>>();
    }

    public void put(ApiCacheKey key, String apiString) {
        cache.put(key, new SoftReference<String>(apiString));
    }

    public String get(ApiCacheKey key) {
        if (key != null) {
            SoftReference<String> apiStringReference = cache.get(key);
            if (apiStringReference != null && apiStringReference.get() != null) {
                return apiStringReference.get();
            }
        }
        return null;
    }

    /**
     * for unit tests
     */
    public void clear() {
        cache.clear();
    }
}