org.magnum.soda.svc.SessionData.java Source code

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Here is the source code for org.magnum.soda.svc.SessionData.java

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/*****************************************************************************
 * Copyright [2013] [Jules White]                                            *
 *                                                                           *
 *  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 org.magnum.soda.svc;

import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.collect.Maps;

public class SessionData {

    private static CacheLoader<String, SessionData> loader_ = new CacheLoader<String, SessionData>() {
        public SessionData load(String key) {
            return new SessionData();
        }
    };

    private static Cache<String, SessionData> sessions_ = createCache(10000, 10, TimeUnit.MINUTES);

    public static void init(int maxSize, int expireAfter, TimeUnit unit) {
        sessions_ = createCache(maxSize, expireAfter, unit);
    }

    private static Cache<String, SessionData> createCache(int maxSize, int expireAfter, TimeUnit unit) {
        return CacheBuilder.newBuilder().maximumSize(maxSize).expireAfterAccess(expireAfter, unit)
                // .removalListener(MY_LISTENER)
                .build(loader_);
    }

    public static SessionData forClient(final String id) {
        try {
            return sessions_.get(id, new Callable<SessionData>() {

                @Override
                public SessionData call() throws Exception {
                    return loader_.load(id);
                }
            });
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }
    }

    private Map<Object, Object> data_ = Maps.newConcurrentMap();

    @SuppressWarnings("unchecked")
    public <T> T get(Object key) {
        return (T) data_.get(key);
    }

    public void put(Object key, Object data) {
        data_.put(key, data);
    }
}