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HttpClient-based client for Riak

There is a newer version: 2.1.1

/*
 * This file is provided to you 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.basho.riak.client.convert.reflect;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;

/**
 * TODO: consider class reloading and re-scanning
 * @author russell
 * @param 
 * 
 */
public class AnnotationCache {
    @SuppressWarnings("rawtypes") private final ConcurrentHashMap> cache = new ConcurrentHashMap>();

    /**
     * @param 
     * @param name
     * @return
     */
    public  AnnotationInfo get(Class clazz) {

        Future scanner = cache.get(clazz);

        if (scanner == null) {
            FutureTask scannerTask = new FutureTask(new AnnotationScanner(clazz));

            scanner = cache.putIfAbsent(clazz, scannerTask);
            if (scanner == null) {
                scanner = scannerTask;
                scannerTask.run();
            }
        }

        try {
            return scanner.get();
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            throw new RuntimeException(e);
        } catch (ExecutionException e) {
            cache.remove(clazz);
            throw new RuntimeException(e.getCause());
        }
    }

}