ImageServletTokenImpl.java :  » Portal » liferay-portal-4.4.2 » com » liferay » portal » servlet » Java Open Source

/**
 * Copyright (c) 2000-2008 Liferay, Inc. 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.liferay.portal.servlet;

import com.liferay.portal.cms.servlet.CMSServletUtil;
import com.liferay.portal.kernel.cache.MultiVMPoolUtil;
import com.liferay.portal.kernel.cache.PortalCache;
import com.liferay.portal.kernel.servlet.ImageServletToken;
import com.liferay.portal.kernel.util.StringMaker;
import com.liferay.portal.kernel.util.StringPool;
import com.liferay.portal.servlet.filters.layoutcache.LayoutCacheUtil;
import com.liferay.portlet.journalcontent.util.JournalContentUtil;

/**
 * <a href="ImageServletTokenImpl.java.html"><b><i>View Source</i></b></a>
 *
 * @author Brian Wing Shun Chan
 *
 */
public class ImageServletTokenImpl implements ImageServletToken {

  public static final String CACHE_NAME = ImageServletToken.class.getName();

  public String getToken(long imageId) {
    String key = _encodeKey(imageId);

    String token = (String)MultiVMPoolUtil.get(_cache, key);

    if (token == null) {
      token = _createToken(imageId);

      MultiVMPoolUtil.put(_cache, key, token);
    }

    return token;
  }

  public void resetToken(long imageId) {
    String key = _encodeKey(imageId);

    _cache.remove(key);

    // CMS

    CMSServletUtil.clearCache();

    // Journal content

    JournalContentUtil.clearCache();

    // Layout cache

    LayoutCacheUtil.clearCache();
  }

  private String _createToken(long imageId) {
    return String.valueOf(System.currentTimeMillis());
  }

  private String _encodeKey(long imageId) {
    StringMaker sm = new StringMaker();

    sm.append(CACHE_NAME);
    sm.append(StringPool.POUND);
    sm.append(imageId);

    return sm.toString();
  }

  private static PortalCache _cache = MultiVMPoolUtil.getCache(CACHE_NAME);

}