/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* 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 com.alibaba.citrus.service.requestcontext.session.impl;
import static com.alibaba.citrus.util.BasicConstant.*;
import static com.alibaba.citrus.util.ObjectUtil.*;
import static com.alibaba.citrus.util.StringUtil.*;
import java.text.MessageFormat;
import com.alibaba.citrus.service.requestcontext.session.SessionModel;
import com.alibaba.citrus.service.requestcontext.session.SessionModel.Factory;
import com.alibaba.citrus.service.requestcontext.session.SessionModelEncoder;
import com.alibaba.citrus.springext.support.parser.AbstractSingleBeanDefinitionParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <code>SessionModelEncoder</code>的默认实现：将model内容保存成字符串。
*
* @author Michael Zhou
*/
public class SessionModelEncoderImpl implements SessionModelEncoder {
private static final Logger log = LoggerFactory.getLogger(SessionModelEncoderImpl.class);
private static final String pattern = "'{'id:\"{0}\",ct:{1,number,#},ac:{2,number,#},mx:{3,number,#}'}'";
public Object encode(SessionModel model) {
Object[] args = { defaultIfNull(model.getSessionID(), EMPTY_STRING), //
model.getCreationTime(), //
model.getLastAccessedTime(), //
model.getMaxInactiveInterval() //
};
String data = new MessageFormat(pattern).format(args);
if (log.isDebugEnabled()) {
log.debug("Stored session model data: {}", data);
}
return data;
}
public SessionModel decode(Object data, Factory factory) {
SessionModel model = null;
if (data instanceof String) {
log.trace("Trying to parse session model data: {}", data);
try {
Object[] values = new MessageFormat(pattern).parse((String) data);
String sessionID = trimToNull((String) values[0]);
long creationTime = (Long) values[1];
long lastAccessedTime = (Long) values[2];
int maxInactiveInterval = ((Long) values[3]).intValue();
model = factory.newInstance(sessionID, creationTime, lastAccessedTime, maxInactiveInterval);
} catch (Exception e) {
if (log.isDebugEnabled()) {
log.debug("Could not parse session model data: " + data, e);
}
}
}
return model;
}
public static class DefinitionParser extends AbstractSingleBeanDefinitionParser<SessionModelEncoderImpl> {
}
}