com.appslandia.plum.base.SessionTempDataManager Maven / Gradle / Ivy

Go to download
// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.appslandia.common.base.LruCache;
import com.appslandia.common.utils.ObjectUtils;
import com.appslandia.plum.utils.ServletUtils;

/**
 *
 * @author Loc Ha
 *
 */
public abstract class SessionTempDataManager extends TempDataManager {

	public static final String SESSION_ATTRIBUTE_TEMP_DATA_CACHE = "tempDataCache";

	public static final int DEFAULT_CACHE_SIZE = 3;
	public static final String CONFIG_CACHE_SIZE = SessionTempDataManager.class.getName() + ".cache_size";

	@Inject
	protected AppConfig appConfig;

	protected int getCacheSize() {
		return this.appConfig.getInt(CONFIG_CACHE_SIZE, DEFAULT_CACHE_SIZE);
	}

	@Override
	protected void doSaveTempData(HttpServletRequest request, HttpServletResponse response, String tempDataId, TempData tempData) {
		HttpSession session = request.getSession();
		synchronized (ServletUtils.getMutex(session)) {
			LruCache cache = ObjectUtils.cast(session.getAttribute(SESSION_ATTRIBUTE_TEMP_DATA_CACHE));
			if (cache == null) {
				cache = new LruCache<>(getCacheSize());
			}

			cache.put(tempDataId, tempData);
			session.setAttribute(SESSION_ATTRIBUTE_TEMP_DATA_CACHE, cache);
		}
	}

	@Override
	protected TempData doLoadTempData(HttpServletRequest request, HttpServletResponse response, String tempDataId) {
		HttpSession session = request.getSession(false);
		if (session == null) {
			return null;
		}
		synchronized (ServletUtils.getMutex(session)) {
			LruCache cache = ObjectUtils.cast(session.getAttribute(SESSION_ATTRIBUTE_TEMP_DATA_CACHE));
			if (cache != null) {

				TempData tempData = cache.remove(tempDataId);
				if (tempData != null) {
					session.setAttribute(SESSION_ATTRIBUTE_TEMP_DATA_CACHE, cache);
				}
				return tempData;
			}
			return null;
		}
	}
}